// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
/*
 * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
 */

#define LOG_CATEGORY UCLASS_CLK

#include <common.h>
#include <clk-uclass.h>
#include <div64.h>
#include <dm.h>
#include <init.h>
#include <log.h>
#include <regmap.h>
#include <spl.h>
#include <syscon.h>
#include <time.h>
#include <vsprintf.h>
#include <asm/arch/sys_proto.h>
#include <asm/global_data.h>
#include <dm/device_compat.h>
#include <dt-bindings/clock/stm32mp1-clks.h>
#include <dt-bindings/clock/stm32mp1-clksrc.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/iopoll.h>

DECLARE_GLOBAL_DATA_PTR;

#ifndef CONFIG_TFABOOT
#if !defined(CONFIG_SPL) || defined(CONFIG_SPL_BUILD)
/* activate clock tree initialization in the driver */
#define STM32MP1_CLOCK_TREE_INIT
#endif
#endif

#define MAX_HSI_HZ              64000000

/* TIMEOUT */
#define TIMEOUT_200MS           200000
#define TIMEOUT_1S              1000000

/* STGEN registers */
#define STGENC_CNTCR            0x00
#define STGENC_CNTSR            0x04
#define STGENC_CNTCVL           0x08
#define STGENC_CNTCVU           0x0C
#define STGENC_CNTFID0          0x20

#define STGENC_CNTCR_EN         BIT(0)

/* RCC registers */
#define RCC_OCENSETR            0x0C
#define RCC_OCENCLRR            0x10
#define RCC_HSICFGR             0x18
#define RCC_MPCKSELR            0x20
#define RCC_ASSCKSELR           0x24
#define RCC_RCK12SELR           0x28
#define RCC_MPCKDIVR            0x2C
#define RCC_AXIDIVR             0x30
#define RCC_APB4DIVR            0x3C
#define RCC_APB5DIVR            0x40
#define RCC_RTCDIVR             0x44
#define RCC_MSSCKSELR           0x48
#define RCC_PLL1CR              0x80
#define RCC_PLL1CFGR1           0x84
#define RCC_PLL1CFGR2           0x88
#define RCC_PLL1FRACR           0x8C
#define RCC_PLL1CSGR            0x90
#define RCC_PLL2CR              0x94
#define RCC_PLL2CFGR1           0x98
#define RCC_PLL2CFGR2           0x9C
#define RCC_PLL2FRACR           0xA0
#define RCC_PLL2CSGR            0xA4
#define RCC_I2C46CKSELR         0xC0
#define RCC_SPI6CKSELR          0xC4
#define RCC_CPERCKSELR          0xD0
#define RCC_STGENCKSELR         0xD4
#define RCC_DDRITFCR            0xD8
#define RCC_BDCR                0x140
#define RCC_RDLSICR             0x144
#define RCC_MP_APB4ENSETR       0x200
#define RCC_MP_APB5ENSETR       0x208
#define RCC_MP_AHB5ENSETR       0x210
#define RCC_MP_AHB6ENSETR       0x218
#define RCC_OCRDYR              0x808
#define RCC_DBGCFGR             0x80C
#define RCC_RCK3SELR            0x820
#define RCC_RCK4SELR            0x824
#define RCC_MCUDIVR             0x830
#define RCC_APB1DIVR            0x834
#define RCC_APB2DIVR            0x838
#define RCC_APB3DIVR            0x83C
#define RCC_PLL3CR              0x880
#define RCC_PLL3CFGR1           0x884
#define RCC_PLL3CFGR2           0x888
#define RCC_PLL3FRACR           0x88C
#define RCC_PLL3CSGR            0x890
#define RCC_PLL4CR              0x894
#define RCC_PLL4CFGR1           0x898
#define RCC_PLL4CFGR2           0x89C
#define RCC_PLL4FRACR           0x8A0
#define RCC_PLL4CSGR            0x8A4
#define RCC_I2C12CKSELR         0x8C0
#define RCC_I2C35CKSELR         0x8C4
#define RCC_SPI2S1CKSELR        0x8D8
#define RCC_SPI2S23CKSELR       0x8DC
#define RCC_SPI45CKSELR         0x8E0
#define RCC_UART6CKSELR         0x8E4
#define RCC_UART24CKSELR        0x8E8
#define RCC_UART35CKSELR        0x8EC
#define RCC_UART78CKSELR        0x8F0
#define RCC_SDMMC12CKSELR       0x8F4
#define RCC_SDMMC3CKSELR        0x8F8
#define RCC_ETHCKSELR           0x8FC
#define RCC_QSPICKSELR          0x900
#define RCC_FMCCKSELR           0x904
#define RCC_USBCKSELR           0x91C
#define RCC_DSICKSELR           0x924
#define RCC_ADCCKSELR           0x928
#define RCC_MP_APB1ENSETR       0xA00
#define RCC_MP_APB2ENSETR       0XA08
#define RCC_MP_APB3ENSETR       0xA10
#define RCC_MP_AHB2ENSETR       0xA18
#define RCC_MP_AHB3ENSETR       0xA20
#define RCC_MP_AHB4ENSETR       0xA28

/* used for most of SELR register */
#define RCC_SELR_SRC_MASK       GENMASK(2, 0)
#define RCC_SELR_SRCRDY         BIT(31)

/* Values of RCC_MPCKSELR register */
#define RCC_MPCKSELR_HSI        0
#define RCC_MPCKSELR_HSE        1
#define RCC_MPCKSELR_PLL        2
#define RCC_MPCKSELR_PLL_MPUDIV 3

/* Values of RCC_ASSCKSELR register */
#define RCC_ASSCKSELR_HSI       0
#define RCC_ASSCKSELR_HSE       1
#define RCC_ASSCKSELR_PLL       2

/* Values of RCC_MSSCKSELR register */
#define RCC_MSSCKSELR_HSI       0
#define RCC_MSSCKSELR_HSE       1
#define RCC_MSSCKSELR_CSI       2
#define RCC_MSSCKSELR_PLL       3

/* Values of RCC_CPERCKSELR register */
#define RCC_CPERCKSELR_HSI      0
#define RCC_CPERCKSELR_CSI      1
#define RCC_CPERCKSELR_HSE      2

/* used for most of DIVR register : max div for RTC */
#define RCC_DIVR_DIV_MASK       GENMASK(5, 0)
#define RCC_DIVR_DIVRDY         BIT(31)

/* Masks for specific DIVR registers */
#define RCC_APBXDIV_MASK        GENMASK(2, 0)
#define RCC_MPUDIV_MASK         GENMASK(2, 0)
#define RCC_AXIDIV_MASK         GENMASK(2, 0)
#define RCC_MCUDIV_MASK         GENMASK(3, 0)

/*  offset between RCC_MP_xxxENSETR and RCC_MP_xxxENCLRR registers */
#define RCC_MP_ENCLRR_OFFSET    4

/* Fields of RCC_BDCR register */
#define RCC_BDCR_LSEON          BIT(0)
#define RCC_BDCR_LSEBYP         BIT(1)
#define RCC_BDCR_LSERDY         BIT(2)
#define RCC_BDCR_DIGBYP         BIT(3)
#define RCC_BDCR_LSEDRV_MASK    GENMASK(5, 4)
#define RCC_BDCR_LSEDRV_SHIFT   4
#define RCC_BDCR_LSECSSON       BIT(8)
#define RCC_BDCR_RTCCKEN        BIT(20)
#define RCC_BDCR_RTCSRC_MASK    GENMASK(17, 16)
#define RCC_BDCR_RTCSRC_SHIFT   16

/* Fields of RCC_RDLSICR register */
#define RCC_RDLSICR_LSION       BIT(0)
#define RCC_RDLSICR_LSIRDY      BIT(1)

/* used for ALL PLLNCR registers */
#define RCC_PLLNCR_PLLON        BIT(0)
#define RCC_PLLNCR_PLLRDY       BIT(1)
#define RCC_PLLNCR_SSCG_CTRL    BIT(2)
#define RCC_PLLNCR_DIVPEN       BIT(4)
#define RCC_PLLNCR_DIVQEN       BIT(5)
#define RCC_PLLNCR_DIVREN       BIT(6)
#define RCC_PLLNCR_DIVEN_SHIFT  4

/* used for ALL PLLNCFGR1 registers */
#define RCC_PLLNCFGR1_DIVM_SHIFT        16
#define RCC_PLLNCFGR1_DIVM_MASK         GENMASK(21, 16)
#define RCC_PLLNCFGR1_DIVN_SHIFT        0
#define RCC_PLLNCFGR1_DIVN_MASK         GENMASK(8, 0)
/* only for PLL3 and PLL4 */
#define RCC_PLLNCFGR1_IFRGE_SHIFT       24
#define RCC_PLLNCFGR1_IFRGE_MASK        GENMASK(25, 24)

/* used for ALL PLLNCFGR2 registers , using stm32mp1_div_id */
#define RCC_PLLNCFGR2_SHIFT(div_id)     ((div_id) * 8)
#define RCC_PLLNCFGR2_DIVX_MASK         GENMASK(6, 0)
#define RCC_PLLNCFGR2_DIVP_SHIFT        RCC_PLLNCFGR2_SHIFT(_DIV_P)
#define RCC_PLLNCFGR2_DIVP_MASK         GENMASK(6, 0)
#define RCC_PLLNCFGR2_DIVQ_SHIFT        RCC_PLLNCFGR2_SHIFT(_DIV_Q)
#define RCC_PLLNCFGR2_DIVQ_MASK         GENMASK(14, 8)
#define RCC_PLLNCFGR2_DIVR_SHIFT        RCC_PLLNCFGR2_SHIFT(_DIV_R)
#define RCC_PLLNCFGR2_DIVR_MASK         GENMASK(22, 16)

/* used for ALL PLLNFRACR registers */
#define RCC_PLLNFRACR_FRACV_SHIFT       3
#define RCC_PLLNFRACR_FRACV_MASK        GENMASK(15, 3)
#define RCC_PLLNFRACR_FRACLE            BIT(16)

/* used for ALL PLLNCSGR registers */
#define RCC_PLLNCSGR_INC_STEP_SHIFT     16
#define RCC_PLLNCSGR_INC_STEP_MASK      GENMASK(30, 16)
#define RCC_PLLNCSGR_MOD_PER_SHIFT      0
#define RCC_PLLNCSGR_MOD_PER_MASK       GENMASK(12, 0)
#define RCC_PLLNCSGR_SSCG_MODE_SHIFT    15
#define RCC_PLLNCSGR_SSCG_MODE_MASK     BIT(15)

/* used for RCC_OCENSETR and RCC_OCENCLRR registers */
#define RCC_OCENR_HSION                 BIT(0)
#define RCC_OCENR_CSION                 BIT(4)
#define RCC_OCENR_DIGBYP                BIT(7)
#define RCC_OCENR_HSEON                 BIT(8)
#define RCC_OCENR_HSEBYP                BIT(10)
#define RCC_OCENR_HSECSSON              BIT(11)

/* Fields of RCC_OCRDYR register */
#define RCC_OCRDYR_HSIRDY               BIT(0)
#define RCC_OCRDYR_HSIDIVRDY            BIT(2)
#define RCC_OCRDYR_CSIRDY               BIT(4)
#define RCC_OCRDYR_HSERDY               BIT(8)

/* Fields of DDRITFCR register */
#define RCC_DDRITFCR_DDRCKMOD_MASK      GENMASK(22, 20)
#define RCC_DDRITFCR_DDRCKMOD_SHIFT     20
#define RCC_DDRITFCR_DDRCKMOD_SSR       0

/* Fields of RCC_HSICFGR register */
#define RCC_HSICFGR_HSIDIV_MASK         GENMASK(1, 0)

/* used for MCO related operations */
#define RCC_MCOCFG_MCOON                BIT(12)
#define RCC_MCOCFG_MCODIV_MASK          GENMASK(7, 4)
#define RCC_MCOCFG_MCODIV_SHIFT         4
#define RCC_MCOCFG_MCOSRC_MASK          GENMASK(2, 0)

enum stm32mp1_parent_id {
/*
 * _HSI, _HSE, _CSI, _LSI, _LSE should not be moved
 * they are used as index in osc_clk[] as clock reference
 */
        _HSI,
        _HSE,
        _CSI,
        _LSI,
        _LSE,
        _I2S_CKIN,
        NB_OSC,

/* other parent source */
        _HSI_KER = NB_OSC,
        _HSE_KER,
        _HSE_KER_DIV2,
        _CSI_KER,
        _PLL1_P,
        _PLL1_Q,
        _PLL1_R,
        _PLL2_P,
        _PLL2_Q,
        _PLL2_R,
        _PLL3_P,
        _PLL3_Q,
        _PLL3_R,
        _PLL4_P,
        _PLL4_Q,
        _PLL4_R,
        _ACLK,
        _PCLK1,
        _PCLK2,
        _PCLK3,
        _PCLK4,
        _PCLK5,
        _HCLK6,
        _HCLK2,
        _CK_PER,
        _CK_MPU,
        _CK_MCU,
        _DSI_PHY,
        _USB_PHY_48,
        _PARENT_NB,
        _UNKNOWN_ID = 0xff,
};

enum stm32mp1_parent_sel {
        _I2C12_SEL,
        _I2C35_SEL,
        _I2C46_SEL,
        _UART6_SEL,
        _UART24_SEL,
        _UART35_SEL,
        _UART78_SEL,
        _SDMMC12_SEL,
        _SDMMC3_SEL,
        _ETH_SEL,
        _QSPI_SEL,
        _FMC_SEL,
        _USBPHY_SEL,
        _USBO_SEL,
        _STGEN_SEL,
        _DSI_SEL,
        _ADC12_SEL,
        _SPI1_SEL,
        _SPI23_SEL,
        _SPI45_SEL,
        _SPI6_SEL,
        _RTC_SEL,
        _PARENT_SEL_NB,
        _UNKNOWN_SEL = 0xff,
};

enum stm32mp1_pll_id {
        _PLL1,
        _PLL2,
        _PLL3,
        _PLL4,
        _PLL_NB
};

enum stm32mp1_div_id {
        _DIV_P,
        _DIV_Q,
        _DIV_R,
        _DIV_NB,
};

enum stm32mp1_clksrc_id {
        CLKSRC_MPU,
        CLKSRC_AXI,
        CLKSRC_MCU,
        CLKSRC_PLL12,
        CLKSRC_PLL3,
        CLKSRC_PLL4,
        CLKSRC_RTC,
        CLKSRC_MCO1,
        CLKSRC_MCO2,
        CLKSRC_NB
};

enum stm32mp1_clkdiv_id {
        CLKDIV_MPU,
        CLKDIV_AXI,
        CLKDIV_MCU,
        CLKDIV_APB1,
        CLKDIV_APB2,
        CLKDIV_APB3,
        CLKDIV_APB4,
        CLKDIV_APB5,
        CLKDIV_RTC,
        CLKDIV_MCO1,
        CLKDIV_MCO2,
        CLKDIV_NB
};

enum stm32mp1_pllcfg {
        PLLCFG_M,
        PLLCFG_N,
        PLLCFG_P,
        PLLCFG_Q,
        PLLCFG_R,
        PLLCFG_O,
        PLLCFG_NB
};

enum stm32mp1_pllcsg {
        PLLCSG_MOD_PER,
        PLLCSG_INC_STEP,
        PLLCSG_SSCG_MODE,
        PLLCSG_NB
};

enum stm32mp1_plltype {
        PLL_800,
        PLL_1600,
        PLL_TYPE_NB
};

struct stm32mp1_pll {
        u8 refclk_min;
        u8 refclk_max;
        u8 divn_max;
};

struct stm32mp1_clk_gate {
        u16 offset;
        u8 bit;
        u8 index;
        u8 set_clr;
        u8 sel;
        u8 fixed;
};

struct stm32mp1_clk_sel {
        u16 offset;
        u8 src;
        u8 msk;
        u8 nb_parent;
        const u8 *parent;
};

#define REFCLK_SIZE 4
struct stm32mp1_clk_pll {
        enum stm32mp1_plltype plltype;
        u16 rckxselr;
        u16 pllxcfgr1;
        u16 pllxcfgr2;
        u16 pllxfracr;
        u16 pllxcr;
        u16 pllxcsgr;
        u8 refclk[REFCLK_SIZE];
};

struct stm32mp1_clk_data {
        const struct stm32mp1_clk_gate *gate;
        const struct stm32mp1_clk_sel *sel;
        const struct stm32mp1_clk_pll *pll;
        const int nb_gate;
};

struct stm32mp1_clk_priv {
        fdt_addr_t base;
        const struct stm32mp1_clk_data *data;
        struct clk osc_clk[NB_OSC];
};

#define STM32MP1_CLK(off, b, idx, s)            \
        {                                       \
                .offset = (off),                \
                .bit = (b),                     \
                .index = (idx),                 \
                .set_clr = 0,                   \
                .sel = (s),                     \
                .fixed = _UNKNOWN_ID,           \
        }

#define STM32MP1_CLK_F(off, b, idx, f)          \
        {                                       \
                .offset = (off),                \
                .bit = (b),                     \
                .index = (idx),                 \
                .set_clr = 0,                   \
                .sel = _UNKNOWN_SEL,            \
                .fixed = (f),                   \
        }

#define STM32MP1_CLK_SET_CLR(off, b, idx, s)    \
        {                                       \
                .offset = (off),                \
                .bit = (b),                     \
                .index = (idx),                 \
                .set_clr = 1,                   \
                .sel = (s),                     \
                .fixed = _UNKNOWN_ID,           \
        }

#define STM32MP1_CLK_SET_CLR_F(off, b, idx, f)  \
        {                                       \
                .offset = (off),                \
                .bit = (b),                     \
                .index = (idx),                 \
                .set_clr = 1,                   \
                .sel = _UNKNOWN_SEL,            \
                .fixed = (f),                   \
        }

#define STM32MP1_CLK_PARENT(idx, off, s, m, p)   \
        [(idx)] = {                             \
                .offset = (off),                \
                .src = (s),                     \
                .msk = (m),                     \
                .parent = (p),                  \
                .nb_parent = ARRAY_SIZE((p))    \
        }

#define STM32MP1_CLK_PLL(idx, type, off1, off2, off3, off4, off5, off6,\
                        p1, p2, p3, p4) \
        [(idx)] = {                             \
                .plltype = (type),                      \
                .rckxselr = (off1),             \
                .pllxcfgr1 = (off2),            \
                .pllxcfgr2 = (off3),            \
                .pllxfracr = (off4),            \
                .pllxcr = (off5),               \
                .pllxcsgr = (off6),             \
                .refclk[0] = (p1),              \
                .refclk[1] = (p2),              \
                .refclk[2] = (p3),              \
                .refclk[3] = (p4),              \
        }

static const u8 stm32mp1_clks[][2] = {
        {CK_PER, _CK_PER},
        {CK_MPU, _CK_MPU},
        {CK_AXI, _ACLK},
        {CK_MCU, _CK_MCU},
        {CK_HSE, _HSE},
        {CK_CSI, _CSI},
        {CK_LSI, _LSI},
        {CK_LSE, _LSE},
        {CK_HSI, _HSI},
        {CK_HSE_DIV2, _HSE_KER_DIV2},
};

static const struct stm32mp1_clk_gate stm32mp1_clk_gate[] = {
        STM32MP1_CLK(RCC_DDRITFCR, 0, DDRC1, _UNKNOWN_SEL),
        STM32MP1_CLK(RCC_DDRITFCR, 1, DDRC1LP, _UNKNOWN_SEL),
        STM32MP1_CLK(RCC_DDRITFCR, 2, DDRC2, _UNKNOWN_SEL),
        STM32MP1_CLK(RCC_DDRITFCR, 3, DDRC2LP, _UNKNOWN_SEL),
        STM32MP1_CLK_F(RCC_DDRITFCR, 4, DDRPHYC, _PLL2_R),
        STM32MP1_CLK(RCC_DDRITFCR, 5, DDRPHYCLP, _UNKNOWN_SEL),
        STM32MP1_CLK(RCC_DDRITFCR, 6, DDRCAPB, _UNKNOWN_SEL),
        STM32MP1_CLK(RCC_DDRITFCR, 7, DDRCAPBLP, _UNKNOWN_SEL),
        STM32MP1_CLK(RCC_DDRITFCR, 8, AXIDCG, _UNKNOWN_SEL),
        STM32MP1_CLK(RCC_DDRITFCR, 9, DDRPHYCAPB, _UNKNOWN_SEL),
        STM32MP1_CLK(RCC_DDRITFCR, 10, DDRPHYCAPBLP, _UNKNOWN_SEL),

        STM32MP1_CLK_SET_CLR(RCC_MP_APB1ENSETR, 11, SPI2_K, _SPI23_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB1ENSETR, 12, SPI3_K, _SPI23_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB1ENSETR, 14, USART2_K, _UART24_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB1ENSETR, 15, USART3_K, _UART35_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB1ENSETR, 16, UART4_K, _UART24_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB1ENSETR, 17, UART5_K, _UART35_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB1ENSETR, 18, UART7_K, _UART78_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB1ENSETR, 19, UART8_K, _UART78_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB1ENSETR, 21, I2C1_K, _I2C12_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB1ENSETR, 22, I2C2_K, _I2C12_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB1ENSETR, 23, I2C3_K, _I2C35_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB1ENSETR, 24, I2C5_K, _I2C35_SEL),

        STM32MP1_CLK_SET_CLR(RCC_MP_APB2ENSETR, 8, SPI1_K, _SPI1_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB2ENSETR, 9, SPI4_K, _SPI45_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB2ENSETR, 10, SPI5_K, _SPI45_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB2ENSETR, 13, USART6_K, _UART6_SEL),

        STM32MP1_CLK_SET_CLR_F(RCC_MP_APB3ENSETR, 13, VREF, _PCLK3),
        STM32MP1_CLK_SET_CLR_F(RCC_MP_APB3ENSETR, 11, SYSCFG, _UNKNOWN_SEL),

        STM32MP1_CLK_SET_CLR_F(RCC_MP_APB4ENSETR, 0, LTDC_PX, _PLL4_Q),
        STM32MP1_CLK_SET_CLR_F(RCC_MP_APB4ENSETR, 4, DSI_PX, _PLL4_Q),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB4ENSETR, 4, DSI_K, _DSI_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB4ENSETR, 8, DDRPERFM, _UNKNOWN_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB4ENSETR, 15, IWDG2, _UNKNOWN_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB4ENSETR, 16, USBPHY_K, _USBPHY_SEL),

        STM32MP1_CLK_SET_CLR(RCC_MP_APB5ENSETR, 0, SPI6_K, _SPI6_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB5ENSETR, 2, I2C4_K, _I2C46_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB5ENSETR, 3, I2C6_K, _I2C46_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB5ENSETR, 8, RTCAPB, _PCLK5),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB5ENSETR, 16, BSEC, _UNKNOWN_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_APB5ENSETR, 20, STGEN_K, _STGEN_SEL),

        STM32MP1_CLK_SET_CLR_F(RCC_MP_AHB2ENSETR, 5, ADC12, _HCLK2),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB2ENSETR, 5, ADC12_K, _ADC12_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB2ENSETR, 8, USBO_K, _USBO_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB2ENSETR, 16, SDMMC3_K, _SDMMC3_SEL),

        STM32MP1_CLK_SET_CLR(RCC_MP_AHB3ENSETR, 11, HSEM, _UNKNOWN_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB3ENSETR, 12, IPCC, _UNKNOWN_SEL),

        STM32MP1_CLK_SET_CLR(RCC_MP_AHB4ENSETR, 0, GPIOA, _UNKNOWN_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB4ENSETR, 1, GPIOB, _UNKNOWN_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB4ENSETR, 2, GPIOC, _UNKNOWN_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB4ENSETR, 3, GPIOD, _UNKNOWN_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB4ENSETR, 4, GPIOE, _UNKNOWN_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB4ENSETR, 5, GPIOF, _UNKNOWN_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB4ENSETR, 6, GPIOG, _UNKNOWN_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB4ENSETR, 7, GPIOH, _UNKNOWN_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB4ENSETR, 8, GPIOI, _UNKNOWN_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB4ENSETR, 9, GPIOJ, _UNKNOWN_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB4ENSETR, 10, GPIOK, _UNKNOWN_SEL),

        STM32MP1_CLK_SET_CLR(RCC_MP_AHB5ENSETR, 0, GPIOZ, _UNKNOWN_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB5ENSETR, 6, RNG1_K, _UNKNOWN_SEL),

        STM32MP1_CLK_SET_CLR(RCC_MP_AHB6ENSETR, 7, ETHCK_K, _ETH_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB6ENSETR, 8, ETHTX, _UNKNOWN_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB6ENSETR, 9, ETHRX, _UNKNOWN_SEL),
        STM32MP1_CLK_SET_CLR_F(RCC_MP_AHB6ENSETR, 10, ETHMAC, _ACLK),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB6ENSETR, 12, FMC_K, _FMC_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB6ENSETR, 14, QSPI_K, _QSPI_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB6ENSETR, 16, SDMMC1_K, _SDMMC12_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB6ENSETR, 17, SDMMC2_K, _SDMMC12_SEL),
        STM32MP1_CLK_SET_CLR(RCC_MP_AHB6ENSETR, 24, USBH, _UNKNOWN_SEL),

        STM32MP1_CLK(RCC_DBGCFGR, 8, CK_DBG, _UNKNOWN_SEL),

        STM32MP1_CLK(RCC_BDCR, 20, RTC, _RTC_SEL),
};

static const u8 i2c12_parents[] = {_PCLK1, _PLL4_R, _HSI_KER, _CSI_KER};
static const u8 i2c35_parents[] = {_PCLK1, _PLL4_R, _HSI_KER, _CSI_KER};
static const u8 i2c46_parents[] = {_PCLK5, _PLL3_Q, _HSI_KER, _CSI_KER};
static const u8 uart6_parents[] = {_PCLK2, _PLL4_Q, _HSI_KER, _CSI_KER,
                                        _HSE_KER};
static const u8 uart24_parents[] = {_PCLK1, _PLL4_Q, _HSI_KER, _CSI_KER,
                                         _HSE_KER};
static const u8 uart35_parents[] = {_PCLK1, _PLL4_Q, _HSI_KER, _CSI_KER,
                                         _HSE_KER};
static const u8 uart78_parents[] = {_PCLK1, _PLL4_Q, _HSI_KER, _CSI_KER,
                                         _HSE_KER};
static const u8 sdmmc12_parents[] = {_HCLK6, _PLL3_R, _PLL4_P, _HSI_KER};
static const u8 sdmmc3_parents[] = {_HCLK2, _PLL3_R, _PLL4_P, _HSI_KER};
static const u8 eth_parents[] = {_PLL4_P, _PLL3_Q};
static const u8 qspi_parents[] = {_ACLK, _PLL3_R, _PLL4_P, _CK_PER};
static const u8 fmc_parents[] = {_ACLK, _PLL3_R, _PLL4_P, _CK_PER};
static const u8 usbphy_parents[] = {_HSE_KER, _PLL4_R, _HSE_KER_DIV2};
static const u8 usbo_parents[] = {_PLL4_R, _USB_PHY_48};
static const u8 stgen_parents[] = {_HSI_KER, _HSE_KER};
static const u8 dsi_parents[] = {_DSI_PHY, _PLL4_P};
static const u8 adc_parents[] = {_PLL4_R, _CK_PER, _PLL3_Q};
/* same parents for SPI1=RCC_SPI2S1CKSELR and SPI2&3 = RCC_SPI2S23CKSELR */
static const u8 spi_parents[] = {_PLL4_P, _PLL3_Q, _I2S_CKIN, _CK_PER,
                                 _PLL3_R};
static const u8 spi45_parents[] = {_PCLK2, _PLL4_Q, _HSI_KER, _CSI_KER,
                                   _HSE_KER};
static const u8 spi6_parents[] = {_PCLK5, _PLL4_Q, _HSI_KER, _CSI_KER,
                                  _HSE_KER, _PLL3_Q};
static const u8 rtc_parents[] = {_UNKNOWN_ID, _LSE, _LSI, _HSE};

static const struct stm32mp1_clk_sel stm32mp1_clk_sel[_PARENT_SEL_NB] = {
        STM32MP1_CLK_PARENT(_I2C12_SEL, RCC_I2C12CKSELR, 0, 0x7, i2c12_parents),
        STM32MP1_CLK_PARENT(_I2C35_SEL, RCC_I2C35CKSELR, 0, 0x7, i2c35_parents),
        STM32MP1_CLK_PARENT(_I2C46_SEL, RCC_I2C46CKSELR, 0, 0x7, i2c46_parents),
        STM32MP1_CLK_PARENT(_UART6_SEL, RCC_UART6CKSELR, 0, 0x7, uart6_parents),
        STM32MP1_CLK_PARENT(_UART24_SEL, RCC_UART24CKSELR, 0, 0x7,
                            uart24_parents),
        STM32MP1_CLK_PARENT(_UART35_SEL, RCC_UART35CKSELR, 0, 0x7,
                            uart35_parents),
        STM32MP1_CLK_PARENT(_UART78_SEL, RCC_UART78CKSELR, 0, 0x7,
                            uart78_parents),
        STM32MP1_CLK_PARENT(_SDMMC12_SEL, RCC_SDMMC12CKSELR, 0, 0x7,
                            sdmmc12_parents),
        STM32MP1_CLK_PARENT(_SDMMC3_SEL, RCC_SDMMC3CKSELR, 0, 0x7,
                            sdmmc3_parents),
        STM32MP1_CLK_PARENT(_ETH_SEL, RCC_ETHCKSELR, 0, 0x3, eth_parents),
        STM32MP1_CLK_PARENT(_QSPI_SEL, RCC_QSPICKSELR, 0, 0x3, qspi_parents),
        STM32MP1_CLK_PARENT(_FMC_SEL, RCC_FMCCKSELR, 0, 0x3, fmc_parents),
        STM32MP1_CLK_PARENT(_USBPHY_SEL, RCC_USBCKSELR, 0, 0x3, usbphy_parents),
        STM32MP1_CLK_PARENT(_USBO_SEL, RCC_USBCKSELR, 4, 0x1, usbo_parents),
        STM32MP1_CLK_PARENT(_STGEN_SEL, RCC_STGENCKSELR, 0, 0x3, stgen_parents),
        STM32MP1_CLK_PARENT(_DSI_SEL, RCC_DSICKSELR, 0, 0x1, dsi_parents),
        STM32MP1_CLK_PARENT(_ADC12_SEL, RCC_ADCCKSELR, 0, 0x3, adc_parents),
        STM32MP1_CLK_PARENT(_SPI1_SEL, RCC_SPI2S1CKSELR, 0, 0x7, spi_parents),
        STM32MP1_CLK_PARENT(_SPI23_SEL, RCC_SPI2S23CKSELR, 0, 0x7, spi_parents),
        STM32MP1_CLK_PARENT(_SPI45_SEL, RCC_SPI45CKSELR, 0, 0x7, spi45_parents),
        STM32MP1_CLK_PARENT(_SPI6_SEL, RCC_SPI6CKSELR, 0, 0x7, spi6_parents),
        STM32MP1_CLK_PARENT(_RTC_SEL, RCC_BDCR, RCC_BDCR_RTCSRC_SHIFT,
                            (RCC_BDCR_RTCSRC_MASK >> RCC_BDCR_RTCSRC_SHIFT),
                            rtc_parents),
};

#ifdef STM32MP1_CLOCK_TREE_INIT

/* define characteristic of PLL according type */
#define DIVM_MIN        0
#define DIVM_MAX        63
#define DIVN_MIN        24
#define DIVP_MIN        0
#define DIVP_MAX        127
#define FRAC_MAX        8192

#define PLL1600_VCO_MIN 800000000
#define PLL1600_VCO_MAX 1600000000

static const struct stm32mp1_pll stm32mp1_pll[PLL_TYPE_NB] = {
        [PLL_800] = {
                .refclk_min = 4,
                .refclk_max = 16,
                .divn_max = 99,
                },
        [PLL_1600] = {
                .refclk_min = 8,
                .refclk_max = 16,
                .divn_max = 199,
                },
};
#endif /* STM32MP1_CLOCK_TREE_INIT */

static const struct stm32mp1_clk_pll stm32mp1_clk_pll[_PLL_NB] = {
        STM32MP1_CLK_PLL(_PLL1, PLL_1600,
                         RCC_RCK12SELR, RCC_PLL1CFGR1, RCC_PLL1CFGR2,
                         RCC_PLL1FRACR, RCC_PLL1CR, RCC_PLL1CSGR,
                         _HSI, _HSE, _UNKNOWN_ID, _UNKNOWN_ID),
        STM32MP1_CLK_PLL(_PLL2, PLL_1600,
                         RCC_RCK12SELR, RCC_PLL2CFGR1, RCC_PLL2CFGR2,
                         RCC_PLL2FRACR, RCC_PLL2CR, RCC_PLL2CSGR,
                         _HSI, _HSE, _UNKNOWN_ID, _UNKNOWN_ID),
        STM32MP1_CLK_PLL(_PLL3, PLL_800,
                         RCC_RCK3SELR, RCC_PLL3CFGR1, RCC_PLL3CFGR2,
                         RCC_PLL3FRACR, RCC_PLL3CR, RCC_PLL3CSGR,
                         _HSI, _HSE, _CSI, _UNKNOWN_ID),
        STM32MP1_CLK_PLL(_PLL4, PLL_800,
                         RCC_RCK4SELR, RCC_PLL4CFGR1, RCC_PLL4CFGR2,
                         RCC_PLL4FRACR, RCC_PLL4CR, RCC_PLL4CSGR,
                         _HSI, _HSE, _CSI, _I2S_CKIN),
};

/* Prescaler table lookups for clock computation */
/* div = /1 /2 /4 /8 / 16 /64 /128 /512 */
static const u8 stm32mp1_mcu_div[16] = {
        0, 1, 2, 3, 4, 6, 7, 8, 9, 9, 9, 9, 9, 9, 9, 9
};

/* div = /1 /2 /4 /8 /16 : same divider for pmu and apbx*/
#define stm32mp1_mpu_div stm32mp1_mpu_apbx_div
#define stm32mp1_apbx_div stm32mp1_mpu_apbx_div
static const u8 stm32mp1_mpu_apbx_div[8] = {
        0, 1, 2, 3, 4, 4, 4, 4
};

/* div = /1 /2 /3 /4 */
static const u8 stm32mp1_axi_div[8] = {
        1, 2, 3, 4, 4, 4, 4, 4
};

static const __maybe_unused
char * const stm32mp1_clk_parent_name[_PARENT_NB] = {
        [_HSI] = "HSI",
        [_HSE] = "HSE",
        [_CSI] = "CSI",
        [_LSI] = "LSI",
        [_LSE] = "LSE",
        [_I2S_CKIN] = "I2S_CKIN",
        [_HSI_KER] = "HSI_KER",
        [_HSE_KER] = "HSE_KER",
        [_HSE_KER_DIV2] = "HSE_KER_DIV2",
        [_CSI_KER] = "CSI_KER",
        [_PLL1_P] = "PLL1_P",
        [_PLL1_Q] = "PLL1_Q",
        [_PLL1_R] = "PLL1_R",
        [_PLL2_P] = "PLL2_P",
        [_PLL2_Q] = "PLL2_Q",
        [_PLL2_R] = "PLL2_R",
        [_PLL3_P] = "PLL3_P",
        [_PLL3_Q] = "PLL3_Q",
        [_PLL3_R] = "PLL3_R",
        [_PLL4_P] = "PLL4_P",
        [_PLL4_Q] = "PLL4_Q",
        [_PLL4_R] = "PLL4_R",
        [_ACLK] = "ACLK",
        [_PCLK1] = "PCLK1",
        [_PCLK2] = "PCLK2",
        [_PCLK3] = "PCLK3",
        [_PCLK4] = "PCLK4",
        [_PCLK5] = "PCLK5",
        [_HCLK6] = "KCLK6",
        [_HCLK2] = "HCLK2",
        [_CK_PER] = "CK_PER",
        [_CK_MPU] = "CK_MPU",
        [_CK_MCU] = "CK_MCU",
        [_USB_PHY_48] = "USB_PHY_48",
        [_DSI_PHY] = "DSI_PHY_PLL",
};

static const __maybe_unused
char * const stm32mp1_clk_parent_sel_name[_PARENT_SEL_NB] = {
        [_I2C12_SEL] = "I2C12",
        [_I2C35_SEL] = "I2C35",
        [_I2C46_SEL] = "I2C46",
        [_UART6_SEL] = "UART6",
        [_UART24_SEL] = "UART24",
        [_UART35_SEL] = "UART35",
        [_UART78_SEL] = "UART78",
        [_SDMMC12_SEL] = "SDMMC12",
        [_SDMMC3_SEL] = "SDMMC3",
        [_ETH_SEL] = "ETH",
        [_QSPI_SEL] = "QSPI",
        [_FMC_SEL] = "FMC",
        [_USBPHY_SEL] = "USBPHY",
        [_USBO_SEL] = "USBO",
        [_STGEN_SEL] = "STGEN",
        [_DSI_SEL] = "DSI",
        [_ADC12_SEL] = "ADC12",
        [_SPI1_SEL] = "SPI1",
        [_SPI45_SEL] = "SPI45",
        [_RTC_SEL] = "RTC",
};

static const struct stm32mp1_clk_data stm32mp1_data = {
        .gate = stm32mp1_clk_gate,
        .sel = stm32mp1_clk_sel,
        .pll = stm32mp1_clk_pll,
        .nb_gate = ARRAY_SIZE(stm32mp1_clk_gate),
};

static ulong stm32mp1_clk_get_fixed(struct stm32mp1_clk_priv *priv, int idx)
{
        if (idx >= NB_OSC) {
                log_debug("clk id %d not found\n", idx);
                return 0;
        }

        return clk_get_rate(&priv->osc_clk[idx]);
}

static int stm32mp1_clk_get_id(struct stm32mp1_clk_priv *priv, unsigned long id)
{
        const struct stm32mp1_clk_gate *gate = priv->data->gate;
        int i, nb_clks = priv->data->nb_gate;

        for (i = 0; i < nb_clks; i++) {
                if (gate[i].index == id)
                        break;
        }

        if (i == nb_clks) {
                log_err("clk id %d not found\n", (u32)id);
                return -EINVAL;
        }

        return i;
}

static int stm32mp1_clk_get_sel(struct stm32mp1_clk_priv *priv,
                                int i)
{
        const struct stm32mp1_clk_gate *gate = priv->data->gate;

        if (gate[i].sel > _PARENT_SEL_NB) {
                log_err("parents for clk id %d not found\n", i);
                return -EINVAL;
        }

        return gate[i].sel;
}

static int stm32mp1_clk_get_fixed_parent(struct stm32mp1_clk_priv *priv,
                                         int i)
{
        const struct stm32mp1_clk_gate *gate = priv->data->gate;

        if (gate[i].fixed == _UNKNOWN_ID)
                return -ENOENT;

        return gate[i].fixed;
}

static int stm32mp1_clk_get_parent(struct stm32mp1_clk_priv *priv,
                                   unsigned long id)
{
        const struct stm32mp1_clk_sel *sel = priv->data->sel;
        int i;
        int s, p;
        unsigned int idx;

        for (idx = 0; idx < ARRAY_SIZE(stm32mp1_clks); idx++)
                if (stm32mp1_clks[idx][0] == id)
                        return stm32mp1_clks[idx][1];

        i = stm32mp1_clk_get_id(priv, id);
        if (i < 0)
                return i;

        p = stm32mp1_clk_get_fixed_parent(priv, i);
        if (p >= 0 && p < _PARENT_NB)
                return p;

        s = stm32mp1_clk_get_sel(priv, i);
        if (s < 0)
                return s;

        p = (readl(priv->base + sel[s].offset) >> sel[s].src) & sel[s].msk;

        if (p < sel[s].nb_parent) {
                log_content("%s clock is the parent %s of clk id %d\n",
                            stm32mp1_clk_parent_name[sel[s].parent[p]],
                            stm32mp1_clk_parent_sel_name[s],
                            (u32)id);
                return sel[s].parent[p];
        }

        log_err("no parents defined for clk id %d\n", (u32)id);

        return -EINVAL;
}

static ulong  pll_get_fref_ck(struct stm32mp1_clk_priv *priv,
                              int pll_id)
{
        const struct stm32mp1_clk_pll *pll = priv->data->pll;
        u32 selr;
        int src;
        ulong refclk;

        /* Get current refclk */
        selr = readl(priv->base + pll[pll_id].rckxselr);
        src = selr & RCC_SELR_SRC_MASK;

        refclk = stm32mp1_clk_get_fixed(priv, pll[pll_id].refclk[src]);

        return refclk;
}

/*
 * pll_get_fvco() : return the VCO or (VCO / 2) frequency for the requested PLL
 * - PLL1 & PLL2 => return VCO / 2 with Fpll_y_ck = FVCO / 2 * (DIVy + 1)
 * - PLL3 & PLL4 => return VCO     with Fpll_y_ck = FVCO / (DIVy + 1)
 * => in all the case Fpll_y_ck = pll_get_fvco() / (DIVy + 1)
 */
static ulong pll_get_fvco(struct stm32mp1_clk_priv *priv,
                          int pll_id)
{
        const struct stm32mp1_clk_pll *pll = priv->data->pll;
        int divm, divn;
        ulong refclk, fvco;
        u32 cfgr1, fracr;

        cfgr1 = readl(priv->base + pll[pll_id].pllxcfgr1);
        fracr = readl(priv->base + pll[pll_id].pllxfracr);

        divm = (cfgr1 & (RCC_PLLNCFGR1_DIVM_MASK)) >> RCC_PLLNCFGR1_DIVM_SHIFT;
        divn = cfgr1 & RCC_PLLNCFGR1_DIVN_MASK;

        refclk = pll_get_fref_ck(priv, pll_id);

        /* with FRACV :
         *   Fvco = Fck_ref * ((DIVN + 1) + FRACV / 2^13) / (DIVM + 1)
         * without FRACV
         *   Fvco = Fck_ref * ((DIVN + 1) / (DIVM + 1)
         */
        if (fracr & RCC_PLLNFRACR_FRACLE) {
                u32 fracv = (fracr & RCC_PLLNFRACR_FRACV_MASK)
                            >> RCC_PLLNFRACR_FRACV_SHIFT;
                fvco = (ulong)lldiv((unsigned long long)refclk *
                                     (((divn + 1) << 13) + fracv),
                                     ((unsigned long long)(divm + 1)) << 13);
        } else {
                fvco = (ulong)(refclk * (divn + 1) / (divm + 1));
        }

        return fvco;
}

static ulong stm32mp1_read_pll_freq(struct stm32mp1_clk_priv *priv,
                                    int pll_id, int div_id)
{
        const struct stm32mp1_clk_pll *pll = priv->data->pll;
        int divy;
        ulong dfout;
        u32 cfgr2;

        if (div_id >= _DIV_NB)
                return 0;

        cfgr2 = readl(priv->base + pll[pll_id].pllxcfgr2);
        divy = (cfgr2 >> RCC_PLLNCFGR2_SHIFT(div_id)) & RCC_PLLNCFGR2_DIVX_MASK;

        dfout = pll_get_fvco(priv, pll_id) / (divy + 1);

        return dfout;
}

static ulong stm32mp1_clk_get(struct stm32mp1_clk_priv *priv, int p)
{
        u32 reg;
        ulong clock = 0;

        switch (p) {
        case _CK_MPU:
        /* MPU sub system */
                reg = readl(priv->base + RCC_MPCKSELR);
                switch (reg & RCC_SELR_SRC_MASK) {
                case RCC_MPCKSELR_HSI:
                        clock = stm32mp1_clk_get_fixed(priv, _HSI);
                        break;
                case RCC_MPCKSELR_HSE:
                        clock = stm32mp1_clk_get_fixed(priv, _HSE);
                        break;
                case RCC_MPCKSELR_PLL:
                case RCC_MPCKSELR_PLL_MPUDIV:
                        clock = stm32mp1_read_pll_freq(priv, _PLL1, _DIV_P);
                        if ((reg & RCC_SELR_SRC_MASK) ==
                            RCC_MPCKSELR_PLL_MPUDIV) {
                                reg = readl(priv->base + RCC_MPCKDIVR);
                                clock >>= stm32mp1_mpu_div[reg &
                                        RCC_MPUDIV_MASK];
                        }
                        break;
                }
                break;
        /* AXI sub system */
        case _ACLK:
        case _HCLK2:
        case _HCLK6:
        case _PCLK4:
        case _PCLK5:

                reg = readl(priv->base + RCC_ASSCKSELR);
                switch (reg & RCC_SELR_SRC_MASK) {
                case RCC_ASSCKSELR_HSI:
                        clock = stm32mp1_clk_get_fixed(priv, _HSI);
                        break;
                case RCC_ASSCKSELR_HSE:
                        clock = stm32mp1_clk_get_fixed(priv, _HSE);
                        break;
                case RCC_ASSCKSELR_PLL:
                        clock = stm32mp1_read_pll_freq(priv, _PLL2, _DIV_P);
                        break;
                }

                /* System clock divider */
                reg = readl(priv->base + RCC_AXIDIVR);
                clock /= stm32mp1_axi_div[reg & RCC_AXIDIV_MASK];

                switch (p) {
                case _PCLK4:
                        reg = readl(priv->base + RCC_APB4DIVR);
                        clock >>= stm32mp1_apbx_div[reg & RCC_APBXDIV_MASK];
                        break;
                case _PCLK5:
                        reg = readl(priv->base + RCC_APB5DIVR);
                        clock >>= stm32mp1_apbx_div[reg & RCC_APBXDIV_MASK];
                        break;
                default:
                        break;
                }
                break;
        /* MCU sub system */
        case _CK_MCU:
        case _PCLK1:
        case _PCLK2:
        case _PCLK3:
                reg = readl(priv->base + RCC_MSSCKSELR);
                switch (reg & RCC_SELR_SRC_MASK) {
                case RCC_MSSCKSELR_HSI:
                        clock = stm32mp1_clk_get_fixed(priv, _HSI);
                        break;
                case RCC_MSSCKSELR_HSE:
                        clock = stm32mp1_clk_get_fixed(priv, _HSE);
                        break;
                case RCC_MSSCKSELR_CSI:
                        clock = stm32mp1_clk_get_fixed(priv, _CSI);
                        break;
                case RCC_MSSCKSELR_PLL:
                        clock = stm32mp1_read_pll_freq(priv, _PLL3, _DIV_P);
                        break;
                }

                /* MCU clock divider */
                reg = readl(priv->base + RCC_MCUDIVR);
                clock >>= stm32mp1_mcu_div[reg & RCC_MCUDIV_MASK];

                switch (p) {
                case _PCLK1:
                        reg = readl(priv->base + RCC_APB1DIVR);
                        clock >>= stm32mp1_apbx_div[reg & RCC_APBXDIV_MASK];
                        break;
                case _PCLK2:
                        reg = readl(priv->base + RCC_APB2DIVR);
                        clock >>= stm32mp1_apbx_div[reg & RCC_APBXDIV_MASK];
                        break;
                case _PCLK3:
                        reg = readl(priv->base + RCC_APB3DIVR);
                        clock >>= stm32mp1_apbx_div[reg & RCC_APBXDIV_MASK];
                        break;
                case _CK_MCU:
                default:
                        break;
                }
                break;
        case _CK_PER:
                reg = readl(priv->base + RCC_CPERCKSELR);
                switch (reg & RCC_SELR_SRC_MASK) {
                case RCC_CPERCKSELR_HSI:
                        clock = stm32mp1_clk_get_fixed(priv, _HSI);
                        break;
                case RCC_CPERCKSELR_HSE:
                        clock = stm32mp1_clk_get_fixed(priv, _HSE);
                        break;
                case RCC_CPERCKSELR_CSI:
                        clock = stm32mp1_clk_get_fixed(priv, _CSI);
                        break;
                }
                break;
        case _HSI:
        case _HSI_KER:
                clock = stm32mp1_clk_get_fixed(priv, _HSI);
                break;
        case _CSI:
        case _CSI_KER:
                clock = stm32mp1_clk_get_fixed(priv, _CSI);
                break;
        case _HSE:
        case _HSE_KER:
        case _HSE_KER_DIV2:
                clock = stm32mp1_clk_get_fixed(priv, _HSE);
                if (p == _HSE_KER_DIV2)
                        clock >>= 1;
                break;
        case _LSI:
                clock = stm32mp1_clk_get_fixed(priv, _LSI);
                break;
        case _LSE:
                clock = stm32mp1_clk_get_fixed(priv, _LSE);
                break;
        /* PLL */
        case _PLL1_P:
        case _PLL1_Q:
        case _PLL1_R:
                clock = stm32mp1_read_pll_freq(priv, _PLL1, p - _PLL1_P);
                break;
        case _PLL2_P:
        case _PLL2_Q:
        case _PLL2_R:
                clock = stm32mp1_read_pll_freq(priv, _PLL2, p - _PLL2_P);
                break;
        case _PLL3_P:
        case _PLL3_Q:
        case _PLL3_R:
                clock = stm32mp1_read_pll_freq(priv, _PLL3, p - _PLL3_P);
                break;
        case _PLL4_P:
        case _PLL4_Q:
        case _PLL4_R:
                clock = stm32mp1_read_pll_freq(priv, _PLL4, p - _PLL4_P);
                break;
        /* other */
        case _USB_PHY_48:
                clock = 48000000;
                break;
        case _DSI_PHY:
        {
                struct clk clk;
                struct udevice *dev = NULL;

                if (!uclass_get_device_by_name(UCLASS_CLK, "ck_dsi_phy",
                                               &dev)) {
                        if (clk_request(dev, &clk)) {
                                log_err("ck_dsi_phy request");
                        } else {
                                clk.id = 0;
                                clock = clk_get_rate(&clk);
                        }
                }
                break;
        }
        default:
                break;
        }

        log_debug("id=%d clock = %lx : %ld kHz\n", p, clock, clock / 1000);

        return clock;
}

static int stm32mp1_clk_enable(struct clk *clk)
{
        struct stm32mp1_clk_priv *priv = dev_get_priv(clk->dev);
        const struct stm32mp1_clk_gate *gate = priv->data->gate;
        int i = stm32mp1_clk_get_id(priv, clk->id);

        if (i < 0)
                return i;

        if (gate[i].set_clr)
                writel(BIT(gate[i].bit), priv->base + gate[i].offset);
        else
                setbits_le32(priv->base + gate[i].offset, BIT(gate[i].bit));

        dev_dbg(clk->dev, "%s: id clock %d has been enabled\n", __func__, (u32)clk->id);

        return 0;
}

static int stm32mp1_clk_disable(struct clk *clk)
{
        struct stm32mp1_clk_priv *priv = dev_get_priv(clk->dev);
        const struct stm32mp1_clk_gate *gate = priv->data->gate;
        int i = stm32mp1_clk_get_id(priv, clk->id);

        if (i < 0)
                return i;

        if (gate[i].set_clr)
                writel(BIT(gate[i].bit),
                       priv->base + gate[i].offset
                       + RCC_MP_ENCLRR_OFFSET);
        else
                clrbits_le32(priv->base + gate[i].offset, BIT(gate[i].bit));

        dev_dbg(clk->dev, "%s: id clock %d has been disabled\n", __func__, (u32)clk->id);

        return 0;
}

static ulong stm32mp1_clk_get_rate(struct clk *clk)
{
        struct stm32mp1_clk_priv *priv = dev_get_priv(clk->dev);
        int p = stm32mp1_clk_get_parent(priv, clk->id);
        ulong rate;

        if (p < 0)
                return 0;

        rate = stm32mp1_clk_get(priv, p);

        dev_vdbg(clk->dev, "computed rate for id clock %d is %d (parent is %s)\n",
                 (u32)clk->id, (u32)rate, stm32mp1_clk_parent_name[p]);

        return rate;
}

#ifdef STM32MP1_CLOCK_TREE_INIT

bool stm32mp1_supports_opp(u32 opp_id, u32 cpu_type)
{
        unsigned int id;

        switch (opp_id) {
        case 1:
        case 2:
                id = opp_id;
                break;
        default:
                id = 1; /* default value */
                break;
        }

        switch (cpu_type) {
        case CPU_STM32MP157Fxx:
        case CPU_STM32MP157Dxx:
        case CPU_STM32MP153Fxx:
        case CPU_STM32MP153Dxx:
        case CPU_STM32MP151Fxx:
        case CPU_STM32MP151Dxx:
                return true;
        default:
                return id == 1;
        }
}

__weak void board_vddcore_init(u32 voltage_mv)
{
}

/*
 * gets OPP parameters (frequency in KHz and voltage in mV) from
 * an OPP table subnode. Platform HW support capabilities are also checked.
 * Returns 0 on success and a negative FDT error code on failure.
 */
static int stm32mp1_get_opp(u32 cpu_type, ofnode subnode,
                            u32 *freq_khz, u32 *voltage_mv)
{
        u32 opp_hw;
        u64 read_freq_64;
        u32 read_voltage_32;

        *freq_khz = 0;
        *voltage_mv = 0;

        opp_hw = ofnode_read_u32_default(subnode, "opp-supported-hw", 0);
        if (opp_hw)
                if (!stm32mp1_supports_opp(opp_hw, cpu_type))
                        return -FDT_ERR_BADVALUE;

        read_freq_64 = ofnode_read_u64_default(subnode, "opp-hz", 0) /
                       1000ULL;
        read_voltage_32 = ofnode_read_u32_default(subnode, "opp-microvolt", 0) /
                          1000U;

        if (!read_voltage_32 || !read_freq_64)
                return -FDT_ERR_NOTFOUND;

        /* Frequency value expressed in KHz must fit on 32 bits */
        if (read_freq_64 > U32_MAX)
                return -FDT_ERR_BADVALUE;

        /* Millivolt value must fit on 16 bits */
        if (read_voltage_32 > U16_MAX)
                return -FDT_ERR_BADVALUE;

        *freq_khz = (u32)read_freq_64;
        *voltage_mv = read_voltage_32;

        return 0;
}

/*
 * parses OPP table in DT and finds the parameters for the
 * highest frequency supported by the HW platform.
 * Returns 0 on success and a negative FDT error code on failure.
 */
int stm32mp1_get_max_opp_freq(struct stm32mp1_clk_priv *priv, u64 *freq_hz)
{
        ofnode node, subnode;
        int ret;
        u32 freq = 0U, voltage = 0U;
        u32 cpu_type = get_cpu_type();

        node = ofnode_by_compatible(ofnode_null(), "operating-points-v2");
        if (!ofnode_valid(node))
                return -FDT_ERR_NOTFOUND;

        ofnode_for_each_subnode(subnode, node) {
                unsigned int read_freq;
                unsigned int read_voltage;

                ret = stm32mp1_get_opp(cpu_type, subnode,
                                       &read_freq, &read_voltage);
                if (ret)
                        continue;

                if (read_freq > freq) {
                        freq = read_freq;
                        voltage = read_voltage;
                }
        }

        if (!freq || !voltage)
                return -FDT_ERR_NOTFOUND;

        *freq_hz = (u64)1000U * freq;
        board_vddcore_init(voltage);

        return 0;
}

static int stm32mp1_pll1_opp(struct stm32mp1_clk_priv *priv, int clksrc,
                             u32 *pllcfg, u32 *fracv)
{
        u32 post_divm;
        u32 input_freq;
        u64 output_freq;
        u64 freq;
        u64 vco;
        u32 divm, divn, divp, frac;
        int i, ret;
        u32 diff;
        u32 best_diff = U32_MAX;

        /* PLL1 is 1600 */
        const u32 DIVN_MAX = stm32mp1_pll[PLL_1600].divn_max;
        const u32 POST_DIVM_MIN = stm32mp1_pll[PLL_1600].refclk_min * 1000000U;
        const u32 POST_DIVM_MAX = stm32mp1_pll[PLL_1600].refclk_max * 1000000U;

        ret = stm32mp1_get_max_opp_freq(priv, &output_freq);
        if (ret) {
                log_debug("PLL1 OPP configuration not found (%d).\n", ret);
                return ret;
        }

        switch (clksrc) {
        case CLK_PLL12_HSI:
                input_freq = stm32mp1_clk_get_fixed(priv, _HSI);
                break;
        case CLK_PLL12_HSE:
                input_freq = stm32mp1_clk_get_fixed(priv, _HSE);
                break;
        default:
                return -EINTR;
        }

        /* Following parameters have always the same value */
        pllcfg[PLLCFG_Q] = 0;
        pllcfg[PLLCFG_R] = 0;
        pllcfg[PLLCFG_O] = PQR(1, 0, 0);

        for (divm = DIVM_MAX; divm >= DIVM_MIN; divm--) {
                post_divm = (u32)(input_freq / (divm + 1));
                if (post_divm < POST_DIVM_MIN || post_divm > POST_DIVM_MAX)
                        continue;

                for (divp = DIVP_MIN; divp <= DIVP_MAX; divp++) {
                        freq = output_freq * (divm + 1) * (divp + 1);
                        divn = (u32)((freq / input_freq) - 1);
                        if (divn < DIVN_MIN || divn > DIVN_MAX)
                                continue;

                        frac = (u32)(((freq * FRAC_MAX) / input_freq) -
                                     ((divn + 1) * FRAC_MAX));
                        /* 2 loops to refine the fractional part */
                        for (i = 2; i != 0; i--) {
                                if (frac > FRAC_MAX)
                                        break;

                                vco = (post_divm * (divn + 1)) +
                                      ((post_divm * (u64)frac) /
                                       FRAC_MAX);
                                if (vco < (PLL1600_VCO_MIN / 2) ||
                                    vco > (PLL1600_VCO_MAX / 2)) {
                                        frac++;
                                        continue;
                                }
                                freq = vco / (divp + 1);
                                if (output_freq < freq)
                                        diff = (u32)(freq - output_freq);
                                else
                                        diff = (u32)(output_freq - freq);
                                if (diff < best_diff)  {
                                        pllcfg[PLLCFG_M] = divm;
                                        pllcfg[PLLCFG_N] = divn;
                                        pllcfg[PLLCFG_P] = divp;
                                        *fracv = frac;

                                        if (diff == 0)
                                                return 0;

                                        best_diff = diff;
                                }
                                frac++;
                        }
                }
        }

        if (best_diff == U32_MAX)
                return -1;

        return 0;
}

static void stm32mp1_ls_osc_set(int enable, fdt_addr_t rcc, u32 offset,
                                u32 mask_on)
{
        u32 address = rcc + offset;

        if (enable)
                setbits_le32(address, mask_on);
        else
                clrbits_le32(address, mask_on);
}

static void stm32mp1_hs_ocs_set(int enable, fdt_addr_t rcc, u32 mask_on)
{
        writel(mask_on, rcc + (enable ? RCC_OCENSETR : RCC_OCENCLRR));
}

static int stm32mp1_osc_wait(int enable, fdt_addr_t rcc, u32 offset,
                             u32 mask_rdy)
{
        u32 mask_test = 0;
        u32 address = rcc + offset;
        u32 val;
        int ret;

        if (enable)
                mask_test = mask_rdy;

        ret = readl_poll_timeout(address, val,
                                 (val & mask_rdy) == mask_test,
                                 TIMEOUT_1S);

        if (ret)
                log_err("OSC %x @ %x timeout for enable=%d : 0x%x\n",
                        mask_rdy, address, enable, readl(address));

        return ret;
}

static void stm32mp1_lse_enable(fdt_addr_t rcc, int bypass, int digbyp,
                                u32 lsedrv)
{
        u32 value;

        if (digbyp)
                setbits_le32(rcc + RCC_BDCR, RCC_BDCR_DIGBYP);

        if (bypass || digbyp)
                setbits_le32(rcc + RCC_BDCR, RCC_BDCR_LSEBYP);

        /*
         * warning: not recommended to switch directly from "high drive"
         * to "medium low drive", and vice-versa.
         */
        value = (readl(rcc + RCC_BDCR) & RCC_BDCR_LSEDRV_MASK)
                >> RCC_BDCR_LSEDRV_SHIFT;

        while (value != lsedrv) {
                if (value > lsedrv)
                        value--;
                else
                        value++;

                clrsetbits_le32(rcc + RCC_BDCR,
                                RCC_BDCR_LSEDRV_MASK,
                                value << RCC_BDCR_LSEDRV_SHIFT);
        }

        stm32mp1_ls_osc_set(1, rcc, RCC_BDCR, RCC_BDCR_LSEON);
}

static void stm32mp1_lse_wait(fdt_addr_t rcc)
{
        stm32mp1_osc_wait(1, rcc, RCC_BDCR, RCC_BDCR_LSERDY);
}

static void stm32mp1_lsi_set(fdt_addr_t rcc, int enable)
{
        stm32mp1_ls_osc_set(enable, rcc, RCC_RDLSICR, RCC_RDLSICR_LSION);
        stm32mp1_osc_wait(enable, rcc, RCC_RDLSICR, RCC_RDLSICR_LSIRDY);
}

static void stm32mp1_hse_enable(fdt_addr_t rcc, int bypass, int digbyp, int css)
{
        if (digbyp)
                writel(RCC_OCENR_DIGBYP, rcc + RCC_OCENSETR);
        if (bypass || digbyp)
                writel(RCC_OCENR_HSEBYP, rcc + RCC_OCENSETR);

        stm32mp1_hs_ocs_set(1, rcc, RCC_OCENR_HSEON);
        stm32mp1_osc_wait(1, rcc, RCC_OCRDYR, RCC_OCRDYR_HSERDY);

        if (css)
                writel(RCC_OCENR_HSECSSON, rcc + RCC_OCENSETR);
}

static void stm32mp1_csi_set(fdt_addr_t rcc, int enable)
{
        stm32mp1_hs_ocs_set(enable, rcc, RCC_OCENR_CSION);
        stm32mp1_osc_wait(enable, rcc, RCC_OCRDYR, RCC_OCRDYR_CSIRDY);
}

static void stm32mp1_hsi_set(fdt_addr_t rcc, int enable)
{
        stm32mp1_hs_ocs_set(enable, rcc, RCC_OCENR_HSION);
        stm32mp1_osc_wait(enable, rcc, RCC_OCRDYR, RCC_OCRDYR_HSIRDY);
}

static int stm32mp1_set_hsidiv(fdt_addr_t rcc, u8 hsidiv)
{
        u32 address = rcc + RCC_OCRDYR;
        u32 val;
        int ret;

        clrsetbits_le32(rcc + RCC_HSICFGR,
                        RCC_HSICFGR_HSIDIV_MASK,
                        RCC_HSICFGR_HSIDIV_MASK & hsidiv);

        ret = readl_poll_timeout(address, val,
                                 val & RCC_OCRDYR_HSIDIVRDY,
                                 TIMEOUT_200MS);
        if (ret)
                log_err("HSIDIV failed @ 0x%x: 0x%x\n",
                        address, readl(address));

        return ret;
}

static int stm32mp1_hsidiv(fdt_addr_t rcc, ulong hsifreq)
{
        u8 hsidiv;
        u32 hsidivfreq = MAX_HSI_HZ;

        for (hsidiv = 0; hsidiv < 4; hsidiv++,
             hsidivfreq = hsidivfreq / 2)
                if (hsidivfreq == hsifreq)
                        break;

        if (hsidiv == 4) {
                log_err("hsi frequency invalid");
                return -1;
        }

        if (hsidiv > 0)
                return stm32mp1_set_hsidiv(rcc, hsidiv);

        return 0;
}

static void pll_start(struct stm32mp1_clk_priv *priv, int pll_id)
{
        const struct stm32mp1_clk_pll *pll = priv->data->pll;

        clrsetbits_le32(priv->base + pll[pll_id].pllxcr,
                        RCC_PLLNCR_DIVPEN | RCC_PLLNCR_DIVQEN |
                        RCC_PLLNCR_DIVREN,
                        RCC_PLLNCR_PLLON);
}

static int pll_output(struct stm32mp1_clk_priv *priv, int pll_id, int output)
{
        const struct stm32mp1_clk_pll *pll = priv->data->pll;
        u32 pllxcr = priv->base + pll[pll_id].pllxcr;
        u32 val;
        int ret;

        ret = readl_poll_timeout(pllxcr, val, val & RCC_PLLNCR_PLLRDY,
                                 TIMEOUT_200MS);

        if (ret) {
                log_err("PLL%d start failed @ 0x%x: 0x%x\n",
                        pll_id, pllxcr, readl(pllxcr));
                return ret;
        }

        /* start the requested output */
        setbits_le32(pllxcr, output << RCC_PLLNCR_DIVEN_SHIFT);

        return 0;
}

static int pll_stop(struct stm32mp1_clk_priv *priv, int pll_id)
{
        const struct stm32mp1_clk_pll *pll = priv->data->pll;
        u32 pllxcr = priv->base + pll[pll_id].pllxcr;
        u32 val;

        /* stop all output */
        clrbits_le32(pllxcr,
                     RCC_PLLNCR_DIVPEN | RCC_PLLNCR_DIVQEN | RCC_PLLNCR_DIVREN);

        /* stop PLL */
        clrbits_le32(pllxcr, RCC_PLLNCR_PLLON);

        /* wait PLL stopped */
        return readl_poll_timeout(pllxcr, val, (val & RCC_PLLNCR_PLLRDY) == 0,
                                  TIMEOUT_200MS);
}

static void pll_config_output(struct stm32mp1_clk_priv *priv,
                              int pll_id, u32 *pllcfg)
{
        const struct stm32mp1_clk_pll *pll = priv->data->pll;
        fdt_addr_t rcc = priv->base;
        u32 value;

        value = (pllcfg[PLLCFG_P] << RCC_PLLNCFGR2_DIVP_SHIFT)
                & RCC_PLLNCFGR2_DIVP_MASK;
        value |= (pllcfg[PLLCFG_Q] << RCC_PLLNCFGR2_DIVQ_SHIFT)
                 & RCC_PLLNCFGR2_DIVQ_MASK;
        value |= (pllcfg[PLLCFG_R] << RCC_PLLNCFGR2_DIVR_SHIFT)
                 & RCC_PLLNCFGR2_DIVR_MASK;
        writel(value, rcc + pll[pll_id].pllxcfgr2);
}

static int pll_config(struct stm32mp1_clk_priv *priv, int pll_id,
                      u32 *pllcfg, u32 fracv)
{
        const struct stm32mp1_clk_pll *pll = priv->data->pll;
        fdt_addr_t rcc = priv->base;
        enum stm32mp1_plltype type = pll[pll_id].plltype;
        int src;
        ulong refclk;
        u8 ifrge = 0;
        u32 value;

        src = readl(priv->base + pll[pll_id].rckxselr) & RCC_SELR_SRC_MASK;

        refclk = stm32mp1_clk_get_fixed(priv, pll[pll_id].refclk[src]) /
                 (pllcfg[PLLCFG_M] + 1);

        if (refclk < (stm32mp1_pll[type].refclk_min * 1000000) ||
            refclk > (stm32mp1_pll[type].refclk_max * 1000000)) {
                log_err("invalid refclk = %x\n", (u32)refclk);
                return -EINVAL;
        }
        if (type == PLL_800 && refclk >= 8000000)
                ifrge = 1;

        value = (pllcfg[PLLCFG_N] << RCC_PLLNCFGR1_DIVN_SHIFT)
                 & RCC_PLLNCFGR1_DIVN_MASK;
        value |= (pllcfg[PLLCFG_M] << RCC_PLLNCFGR1_DIVM_SHIFT)
                 & RCC_PLLNCFGR1_DIVM_MASK;
        value |= (ifrge << RCC_PLLNCFGR1_IFRGE_SHIFT)
                 & RCC_PLLNCFGR1_IFRGE_MASK;
        writel(value, rcc + pll[pll_id].pllxcfgr1);

        /* fractional configuration: load sigma-delta modulator (SDM) */

        /* Write into FRACV the new fractional value , and FRACLE to 0 */
        writel(fracv << RCC_PLLNFRACR_FRACV_SHIFT,
               rcc + pll[pll_id].pllxfracr);

        /* Write FRACLE to 1 : FRACV value is loaded into the SDM */
        setbits_le32(rcc + pll[pll_id].pllxfracr,
                     RCC_PLLNFRACR_FRACLE);

        pll_config_output(priv, pll_id, pllcfg);

        return 0;
}

static void pll_csg(struct stm32mp1_clk_priv *priv, int pll_id, u32 *csg)
{
        const struct stm32mp1_clk_pll *pll = priv->data->pll;
        u32 pllxcsg;

        pllxcsg = ((csg[PLLCSG_MOD_PER] << RCC_PLLNCSGR_MOD_PER_SHIFT) &
                    RCC_PLLNCSGR_MOD_PER_MASK) |
                  ((csg[PLLCSG_INC_STEP] << RCC_PLLNCSGR_INC_STEP_SHIFT) &
                    RCC_PLLNCSGR_INC_STEP_MASK) |
                  ((csg[PLLCSG_SSCG_MODE] << RCC_PLLNCSGR_SSCG_MODE_SHIFT) &
                    RCC_PLLNCSGR_SSCG_MODE_MASK);

        writel(pllxcsg, priv->base + pll[pll_id].pllxcsgr);

        setbits_le32(priv->base + pll[pll_id].pllxcr, RCC_PLLNCR_SSCG_CTRL);
}

static  __maybe_unused int pll_set_rate(struct udevice *dev,
                                        int pll_id,
                                        int div_id,
                                        unsigned long clk_rate)
{
        struct stm32mp1_clk_priv *priv = dev_get_priv(dev);
        unsigned int pllcfg[PLLCFG_NB];
        ofnode plloff;
        char name[12];
        const struct stm32mp1_clk_pll *pll = priv->data->pll;
        enum stm32mp1_plltype type = pll[pll_id].plltype;
        int divm, divn, divy;
        int ret;
        ulong fck_ref;
        u32 fracv;
        u64 value;

        if (div_id > _DIV_NB)
                return -EINVAL;

        sprintf(name, "st,pll@%d", pll_id);
        plloff = dev_read_subnode(dev, name);
        if (!ofnode_valid(plloff))
                return -FDT_ERR_NOTFOUND;

        ret = ofnode_read_u32_array(plloff, "cfg",
                                    pllcfg, PLLCFG_NB);
        if (ret < 0)
                return -FDT_ERR_NOTFOUND;

        fck_ref = pll_get_fref_ck(priv, pll_id);

        divm = pllcfg[PLLCFG_M];
        /* select output divider = 0: for _DIV_P, 1:_DIV_Q 2:_DIV_R */
        divy = pllcfg[PLLCFG_P + div_id];

        /* For: PLL1 & PLL2 => VCO is * 2 but ck_pll_y is also / 2
         * So same final result than PLL2 et 4
         * with FRACV
         * Fck_pll_y = Fck_ref * ((DIVN + 1) + FRACV / 2^13)
         *             / (DIVy + 1) * (DIVM + 1)
         * value = (DIVN + 1) * 2^13 + FRACV / 2^13
         *       = Fck_pll_y (DIVy + 1) * (DIVM + 1) * 2^13 / Fck_ref
         */
        value = ((u64)clk_rate * (divy + 1) * (divm + 1)) << 13;
        value = lldiv(value, fck_ref);

        divn = (value >> 13) - 1;
        if (divn < DIVN_MIN ||
            divn > stm32mp1_pll[type].divn_max) {
                dev_err(dev, "divn invalid = %d", divn);
                return -EINVAL;
        }
        fracv = value - ((divn + 1) << 13);
        pllcfg[PLLCFG_N] = divn;

        /* reconfigure PLL */
        pll_stop(priv, pll_id);
        pll_config(priv, pll_id, pllcfg, fracv);
        pll_start(priv, pll_id);
        pll_output(priv, pll_id, pllcfg[PLLCFG_O]);

        return 0;
}

static int set_clksrc(struct stm32mp1_clk_priv *priv, unsigned int clksrc)
{
        u32 address = priv->base + (clksrc >> 4);
        u32 val;
        int ret;

        clrsetbits_le32(address, RCC_SELR_SRC_MASK, clksrc & RCC_SELR_SRC_MASK);
        ret = readl_poll_timeout(address, val, val & RCC_SELR_SRCRDY,
                                 TIMEOUT_200MS);
        if (ret)
                log_err("CLKSRC %x start failed @ 0x%x: 0x%x\n",
                        clksrc, address, readl(address));

        return ret;
}

static void stgen_config(struct stm32mp1_clk_priv *priv)
{
        int p;
        u32 stgenc, cntfid0;
        ulong rate;

        stgenc = STM32_STGEN_BASE;
        cntfid0 = readl(stgenc + STGENC_CNTFID0);
        p = stm32mp1_clk_get_parent(priv, STGEN_K);
        rate = stm32mp1_clk_get(priv, p);

        if (cntfid0 != rate) {
                u64 counter;

                log_debug("System Generic Counter (STGEN) update\n");
                clrbits_le32(stgenc + STGENC_CNTCR, STGENC_CNTCR_EN);
                counter = (u64)readl(stgenc + STGENC_CNTCVL);
                counter |= ((u64)(readl(stgenc + STGENC_CNTCVU))) << 32;
                counter = lldiv(counter * (u64)rate, cntfid0);
                writel((u32)counter, stgenc + STGENC_CNTCVL);
                writel((u32)(counter >> 32), stgenc + STGENC_CNTCVU);
                writel(rate, stgenc + STGENC_CNTFID0);
                setbits_le32(stgenc + STGENC_CNTCR, STGENC_CNTCR_EN);

                __asm__ volatile("mcr p15, 0, %0, c14, c0, 0" : : "r" (rate));

                /* need to update gd->arch.timer_rate_hz with new frequency */
                timer_init();
        }
}

static int set_clkdiv(unsigned int clkdiv, u32 address)
{
        u32 val;
        int ret;

        clrsetbits_le32(address, RCC_DIVR_DIV_MASK, clkdiv & RCC_DIVR_DIV_MASK);
        ret = readl_poll_timeout(address, val, val & RCC_DIVR_DIVRDY,
                                 TIMEOUT_200MS);
        if (ret)
                log_err("CLKDIV %x start failed @ 0x%x: 0x%x\n",
                        clkdiv, address, readl(address));

        return ret;
}

static void stm32mp1_mco_csg(struct stm32mp1_clk_priv *priv,
                             u32 clksrc, u32 clkdiv)
{
        u32 address = priv->base + (clksrc >> 4);

        /*
         * binding clksrc : bit15-4 offset
         *                  bit3:   disable
         *                  bit2-0: MCOSEL[2:0]
         */
        if (clksrc & 0x8) {
                clrbits_le32(address, RCC_MCOCFG_MCOON);
        } else {
                clrsetbits_le32(address,
                                RCC_MCOCFG_MCOSRC_MASK,
                                clksrc & RCC_MCOCFG_MCOSRC_MASK);
                clrsetbits_le32(address,
                                RCC_MCOCFG_MCODIV_MASK,
                                clkdiv << RCC_MCOCFG_MCODIV_SHIFT);
                setbits_le32(address, RCC_MCOCFG_MCOON);
        }
}

static void set_rtcsrc(struct stm32mp1_clk_priv *priv,
                       unsigned int clksrc,
                       int lse_css)
{
        u32 address = priv->base + RCC_BDCR;

        if (readl(address) & RCC_BDCR_RTCCKEN)
                goto skip_rtc;

        if (clksrc == CLK_RTC_DISABLED)
                goto skip_rtc;

        clrsetbits_le32(address,
                        RCC_BDCR_RTCSRC_MASK,
                        clksrc << RCC_BDCR_RTCSRC_SHIFT);

        setbits_le32(address, RCC_BDCR_RTCCKEN);

skip_rtc:
        if (lse_css)
                setbits_le32(address, RCC_BDCR_LSECSSON);
}

static void pkcs_config(struct stm32mp1_clk_priv *priv, u32 pkcs)
{
        u32 address = priv->base + ((pkcs >> 4) & 0xFFF);
        u32 value = pkcs & 0xF;
        u32 mask = 0xF;

        if (pkcs & BIT(31)) {
                mask <<= 4;
                value <<= 4;
        }
        clrsetbits_le32(address, mask, value);
}

static int stm32mp1_clktree(struct udevice *dev)
{
        struct stm32mp1_clk_priv *priv = dev_get_priv(dev);
        fdt_addr_t rcc = priv->base;
        unsigned int clksrc[CLKSRC_NB];
        unsigned int clkdiv[CLKDIV_NB];
        unsigned int pllcfg[_PLL_NB][PLLCFG_NB];
        unsigned int pllfracv[_PLL_NB];
        unsigned int pllcsg[_PLL_NB][PLLCSG_NB];
        bool pllcfg_valid[_PLL_NB];
        bool pllcsg_set[_PLL_NB];
        int ret;
        int i, len;
        int lse_css = 0;
        const u32 *pkcs_cell;

        /* check mandatory field */
        ret = dev_read_u32_array(dev, "st,clksrc", clksrc, CLKSRC_NB);
        if (ret < 0) {
                dev_dbg(dev, "field st,clksrc invalid: error %d\n", ret);
                return -FDT_ERR_NOTFOUND;
        }

        ret = dev_read_u32_array(dev, "st,clkdiv", clkdiv, CLKDIV_NB);
        if (ret < 0) {
                dev_dbg(dev, "field st,clkdiv invalid: error %d\n", ret);
                return -FDT_ERR_NOTFOUND;
        }

        /* check mandatory field in each pll */
        for (i = 0; i < _PLL_NB; i++) {
                char name[12];
                ofnode node;

                sprintf(name, "st,pll@%d", i);
                node = dev_read_subnode(dev, name);
                pllcfg_valid[i] = ofnode_valid(node);
                pllcsg_set[i] = false;
                if (pllcfg_valid[i]) {
                        dev_dbg(dev, "DT for PLL %d @ %s\n", i, name);
                        ret = ofnode_read_u32_array(node, "cfg",
                                                    pllcfg[i], PLLCFG_NB);
                        if (ret < 0) {
                                dev_dbg(dev, "field cfg invalid: error %d\n", ret);
                                return -FDT_ERR_NOTFOUND;
                        }
                        pllfracv[i] = ofnode_read_u32_default(node, "frac", 0);

                        ret = ofnode_read_u32_array(node, "csg", pllcsg[i],
                                                    PLLCSG_NB);
                        if (!ret) {
                                pllcsg_set[i] = true;
                        } else if (ret != -FDT_ERR_NOTFOUND) {
                                dev_dbg(dev, "invalid csg node for pll@%d res=%d\n",
                                        i, ret);
                                return ret;
                        }
                } else if (i == _PLL1)  {
                        /* use OPP for PLL1 for A7 CPU */
                        dev_dbg(dev, "DT for PLL %d with OPP\n", i);
                        ret = stm32mp1_pll1_opp(priv,
                                                clksrc[CLKSRC_PLL12],
                                                pllcfg[i],
                                                &pllfracv[i]);
                        if (ret) {
                                dev_dbg(dev, "PLL %d with OPP error = %d\n", i, ret);
                                return ret;
                        }
                        pllcfg_valid[i] = true;
                }
        }

        dev_dbg(dev, "configuration MCO\n");
        stm32mp1_mco_csg(priv, clksrc[CLKSRC_MCO1], clkdiv[CLKDIV_MCO1]);
        stm32mp1_mco_csg(priv, clksrc[CLKSRC_MCO2], clkdiv[CLKDIV_MCO2]);

        dev_dbg(dev, "switch ON osillator\n");
        /*
         * switch ON oscillator found in device-tree,
         * HSI already ON after bootrom
         */
        if (clk_valid(&priv->osc_clk[_LSI]))
                stm32mp1_lsi_set(rcc, 1);

        if (clk_valid(&priv->osc_clk[_LSE])) {
                int bypass, digbyp;
                u32 lsedrv;
                struct udevice *dev = priv->osc_clk[_LSE].dev;

                bypass = dev_read_bool(dev, "st,bypass");
                digbyp = dev_read_bool(dev, "st,digbypass");
                lse_css = dev_read_bool(dev, "st,css");
                lsedrv = dev_read_u32_default(dev, "st,drive",
                                              LSEDRV_MEDIUM_HIGH);

                stm32mp1_lse_enable(rcc, bypass, digbyp, lsedrv);
        }

        if (clk_valid(&priv->osc_clk[_HSE])) {
                int bypass, digbyp, css;
                struct udevice *dev = priv->osc_clk[_HSE].dev;

                bypass = dev_read_bool(dev, "st,bypass");
                digbyp = dev_read_bool(dev, "st,digbypass");
                css = dev_read_bool(dev, "st,css");

                stm32mp1_hse_enable(rcc, bypass, digbyp, css);
        }
        /* CSI is mandatory for automatic I/O compensation (SYSCFG_CMPCR)
         * => switch on CSI even if node is not present in device tree
         */
        stm32mp1_csi_set(rcc, 1);

        /* come back to HSI */
        dev_dbg(dev, "come back to HSI\n");
        set_clksrc(priv, CLK_MPU_HSI);
        set_clksrc(priv, CLK_AXI_HSI);
        set_clksrc(priv, CLK_MCU_HSI);

        dev_dbg(dev, "pll stop\n");
        for (i = 0; i < _PLL_NB; i++)
                pll_stop(priv, i);

        /* configure HSIDIV */
        dev_dbg(dev, "configure HSIDIV\n");
        if (clk_valid(&priv->osc_clk[_HSI])) {
                stm32mp1_hsidiv(rcc, clk_get_rate(&priv->osc_clk[_HSI]));
                stgen_config(priv);
        }

        /* select DIV */
        dev_dbg(dev, "select DIV\n");
        /* no ready bit when MPUSRC != CLK_MPU_PLL1P_DIV, MPUDIV is disabled */
        writel(clkdiv[CLKDIV_MPU] & RCC_DIVR_DIV_MASK, rcc + RCC_MPCKDIVR);
        set_clkdiv(clkdiv[CLKDIV_AXI], rcc + RCC_AXIDIVR);
        set_clkdiv(clkdiv[CLKDIV_APB4], rcc + RCC_APB4DIVR);
        set_clkdiv(clkdiv[CLKDIV_APB5], rcc + RCC_APB5DIVR);
        set_clkdiv(clkdiv[CLKDIV_MCU], rcc + RCC_MCUDIVR);
        set_clkdiv(clkdiv[CLKDIV_APB1], rcc + RCC_APB1DIVR);
        set_clkdiv(clkdiv[CLKDIV_APB2], rcc + RCC_APB2DIVR);
        set_clkdiv(clkdiv[CLKDIV_APB3], rcc + RCC_APB3DIVR);

        /* no ready bit for RTC */
        writel(clkdiv[CLKDIV_RTC] & RCC_DIVR_DIV_MASK, rcc + RCC_RTCDIVR);

        /* configure PLLs source */
        dev_dbg(dev, "configure PLLs source\n");
        set_clksrc(priv, clksrc[CLKSRC_PLL12]);
        set_clksrc(priv, clksrc[CLKSRC_PLL3]);
        set_clksrc(priv, clksrc[CLKSRC_PLL4]);

        /* configure and start PLLs */
        dev_dbg(dev, "configure PLLs\n");
        for (i = 0; i < _PLL_NB; i++) {
                if (!pllcfg_valid[i])
                        continue;
                dev_dbg(dev, "configure PLL %d\n", i);
                pll_config(priv, i, pllcfg[i], pllfracv[i]);
                if (pllcsg_set[i])
                        pll_csg(priv, i, pllcsg[i]);
                pll_start(priv, i);
        }

        /* wait and start PLLs ouptut when ready */
        for (i = 0; i < _PLL_NB; i++) {
                if (!pllcfg_valid[i])
                        continue;
                dev_dbg(dev, "output PLL %d\n", i);
                pll_output(priv, i, pllcfg[i][PLLCFG_O]);
        }

        /* wait LSE ready before to use it */
        if (clk_valid(&priv->osc_clk[_LSE]))
                stm32mp1_lse_wait(rcc);

        /* configure with expected clock source */
        dev_dbg(dev, "CLKSRC\n");
        set_clksrc(priv, clksrc[CLKSRC_MPU]);
        set_clksrc(priv, clksrc[CLKSRC_AXI]);
        set_clksrc(priv, clksrc[CLKSRC_MCU]);
        set_rtcsrc(priv, clksrc[CLKSRC_RTC], lse_css);

        /* configure PKCK */
        dev_dbg(dev, "PKCK\n");
        pkcs_cell = dev_read_prop(dev, "st,pkcs", &len);
        if (pkcs_cell) {
                bool ckper_disabled = false;

                for (i = 0; i < len / sizeof(u32); i++) {
                        u32 pkcs = (u32)fdt32_to_cpu(pkcs_cell[i]);

                        if (pkcs == CLK_CKPER_DISABLED) {
                                ckper_disabled = true;
                                continue;
                        }
                        pkcs_config(priv, pkcs);
                }
                /* CKPER is source for some peripheral clock
                 * (FMC-NAND / QPSI-NOR) and switching source is allowed
                 * only if previous clock is still ON
                 * => deactivated CKPER only after switching clock
                 */
                if (ckper_disabled)
                        pkcs_config(priv, CLK_CKPER_DISABLED);
        }

        /* STGEN clock source can change with CLK_STGEN_XXX */
        stgen_config(priv);

        dev_dbg(dev, "oscillator off\n");
        /* switch OFF HSI if not found in device-tree */
        if (!clk_valid(&priv->osc_clk[_HSI]))
                stm32mp1_hsi_set(rcc, 0);

        /* Software Self-Refresh mode (SSR) during DDR initilialization */
        clrsetbits_le32(priv->base + RCC_DDRITFCR,
                        RCC_DDRITFCR_DDRCKMOD_MASK,
                        RCC_DDRITFCR_DDRCKMOD_SSR <<
                        RCC_DDRITFCR_DDRCKMOD_SHIFT);

        return 0;
}
#endif /* STM32MP1_CLOCK_TREE_INIT */

static int pll_set_output_rate(struct udevice *dev,
                               int pll_id,
                               int div_id,
                               unsigned long clk_rate)
{
        struct stm32mp1_clk_priv *priv = dev_get_priv(dev);
        const struct stm32mp1_clk_pll *pll = priv->data->pll;
        u32 pllxcr = priv->base + pll[pll_id].pllxcr;
        int div;
        ulong fvco;

        if (div_id > _DIV_NB)
                return -EINVAL;

        fvco = pll_get_fvco(priv, pll_id);

        if (fvco <= clk_rate)
                div = 1;
        else
                div = DIV_ROUND_UP(fvco, clk_rate);

        if (div > 128)
                div = 128;

        /* stop the requested output */
        clrbits_le32(pllxcr, 0x1 << div_id << RCC_PLLNCR_DIVEN_SHIFT);
        /* change divider */
        clrsetbits_le32(priv->base + pll[pll_id].pllxcfgr2,
                        RCC_PLLNCFGR2_DIVX_MASK << RCC_PLLNCFGR2_SHIFT(div_id),
                        (div - 1) << RCC_PLLNCFGR2_SHIFT(div_id));
        /* start the requested output */
        setbits_le32(pllxcr, 0x1 << div_id << RCC_PLLNCR_DIVEN_SHIFT);

        return 0;
}

static ulong stm32mp1_clk_set_rate(struct clk *clk, unsigned long clk_rate)
{
        struct stm32mp1_clk_priv *priv = dev_get_priv(clk->dev);
        int p;

        switch (clk->id) {
#if defined(STM32MP1_CLOCK_TREE_INIT) && \
        defined(CONFIG_STM32MP1_DDR_INTERACTIVE)
        case DDRPHYC:
                break;
#endif
        case LTDC_PX:
        case DSI_PX:
                break;
        default:
                dev_err(clk->dev, "Set of clk %ld not supported", clk->id);
                return -EINVAL;
        }

        p = stm32mp1_clk_get_parent(priv, clk->id);
        dev_vdbg(clk->dev, "parent = %d:%s\n", p, stm32mp1_clk_parent_name[p]);
        if (p < 0)
                return -EINVAL;

        switch (p) {
#if defined(STM32MP1_CLOCK_TREE_INIT) && \
        defined(CONFIG_STM32MP1_DDR_INTERACTIVE)
        case _PLL2_R: /* DDRPHYC */
        {
                /* only for change DDR clock in interactive mode */
                ulong result;

                set_clksrc(priv, CLK_AXI_HSI);
                result = pll_set_rate(clk->dev,  _PLL2, _DIV_R, clk_rate);
                set_clksrc(priv, CLK_AXI_PLL2P);
                return result;
        }
#endif

        case _PLL4_Q:
                /* for LTDC_PX and DSI_PX case */
                return pll_set_output_rate(clk->dev, _PLL4, _DIV_Q, clk_rate);
        }

        return -EINVAL;
}

static void stm32mp1_osc_init(struct udevice *dev)
{
        struct stm32mp1_clk_priv *priv = dev_get_priv(dev);
        int i;
        const char *name[NB_OSC] = {
                [_LSI] = "lsi",
                [_LSE] = "lse",
                [_HSI] = "hsi",
                [_HSE] = "hse",
                [_CSI] = "csi",
                [_I2S_CKIN] = "i2s_ckin",
        };

        for (i = 0; i < NB_OSC; i++) {
                if (clk_get_by_name(dev, name[i], &priv->osc_clk[i]))
                        dev_dbg(dev, "No source clock \"%s\"", name[i]);
                else
                        dev_dbg(dev, "%s clock rate: %luHz\n",
                                name[i], clk_get_rate(&priv->osc_clk[i]));
        }
}

static void  __maybe_unused stm32mp1_clk_dump(struct stm32mp1_clk_priv *priv)
{
        char buf[32];
        int i, s, p;

        printf("Clocks:\n");
        for (i = 0; i < _PARENT_NB; i++) {
                printf("- %s : %s MHz\n",
                       stm32mp1_clk_parent_name[i],
                       strmhz(buf, stm32mp1_clk_get(priv, i)));
        }
        printf("Source Clocks:\n");
        for (i = 0; i < _PARENT_SEL_NB; i++) {
                p = (readl(priv->base + priv->data->sel[i].offset) >>
                     priv->data->sel[i].src) & priv->data->sel[i].msk;
                if (p < priv->data->sel[i].nb_parent) {
                        s = priv->data->sel[i].parent[p];
                        printf("- %s(%d) => parent %s(%d)\n",
                               stm32mp1_clk_parent_sel_name[i], i,
                               stm32mp1_clk_parent_name[s], s);
                } else {
                        printf("- %s(%d) => parent index %d is invalid\n",
                               stm32mp1_clk_parent_sel_name[i], i, p);
                }
        }
}

#ifdef CONFIG_CMD_CLK
int soc_clk_dump(void)
{
        struct udevice *dev;
        struct stm32mp1_clk_priv *priv;
        int ret;

        ret = uclass_get_device_by_driver(UCLASS_CLK,
                                          DM_DRIVER_GET(stm32mp1_clock),
                                          &dev);
        if (ret)
                return ret;

        priv = dev_get_priv(dev);

        stm32mp1_clk_dump(priv);

        return 0;
}
#endif

static int stm32mp1_clk_probe(struct udevice *dev)
{
        int result = 0;
        struct stm32mp1_clk_priv *priv = dev_get_priv(dev);

        priv->base = dev_read_addr(dev->parent);
        if (priv->base == FDT_ADDR_T_NONE)
                return -EINVAL;

        priv->data = (void *)&stm32mp1_data;

        if (!priv->data->gate || !priv->data->sel ||
            !priv->data->pll)
                return -EINVAL;

        stm32mp1_osc_init(dev);

#ifdef STM32MP1_CLOCK_TREE_INIT
        /* clock tree init is done only one time, before relocation */
        if (!(gd->flags & GD_FLG_RELOC))
                result = stm32mp1_clktree(dev);
        if (result)
                dev_err(dev, "clock tree initialization failed (%d)\n", result);
#endif

#ifndef CONFIG_SPL_BUILD
#if defined(VERBOSE_DEBUG)
        /* display debug information for probe after relocation */
        if (gd->flags & GD_FLG_RELOC)
                stm32mp1_clk_dump(priv);
#endif

        gd->cpu_clk = stm32mp1_clk_get(priv, _CK_MPU);
        gd->bus_clk = stm32mp1_clk_get(priv, _ACLK);
        /* DDRPHYC father */
        gd->mem_clk = stm32mp1_clk_get(priv, _PLL2_R);
#if defined(CONFIG_DISPLAY_CPUINFO)
        if (gd->flags & GD_FLG_RELOC) {
                char buf[32];

                log_info("Clocks:\n");
                log_info("- MPU : %s MHz\n", strmhz(buf, gd->cpu_clk));
                log_info("- MCU : %s MHz\n",
                         strmhz(buf, stm32mp1_clk_get(priv, _CK_MCU)));
                log_info("- AXI : %s MHz\n", strmhz(buf, gd->bus_clk));
                log_info("- PER : %s MHz\n",
                         strmhz(buf, stm32mp1_clk_get(priv, _CK_PER)));
                log_info("- DDR : %s MHz\n", strmhz(buf, gd->mem_clk));
        }
#endif /* CONFIG_DISPLAY_CPUINFO */
#endif

        return result;
}

static const struct clk_ops stm32mp1_clk_ops = {
        .enable = stm32mp1_clk_enable,
        .disable = stm32mp1_clk_disable,
        .get_rate = stm32mp1_clk_get_rate,
        .set_rate = stm32mp1_clk_set_rate,
};

U_BOOT_DRIVER(stm32mp1_clock) = {
        .name = "stm32mp1_clk",
        .id = UCLASS_CLK,
        .ops = &stm32mp1_clk_ops,
        .priv_auto      = sizeof(struct stm32mp1_clk_priv),
        .probe = stm32mp1_clk_probe,
};