// SPDX-License-Identifier: GPL-2.0
/*
 * R9A06G032 clock driver
 *
 * Copyright (C) 2018 Renesas Electronics Europe Limited
 *
 * Michel Pollet <michel.pollet@bp.renesas.com>, <buserror@gmail.com>
 */

#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/math64.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/pm_clock.h>
#include <linux/pm_domain.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <dt-bindings/clock/r9a06g032-sysctrl.h>

struct r9a06g032_gate {
        u16 gate, reset, ready, midle,
                scon, mirack, mistat;
};

/* This is used to describe a clock for instantiation */
struct r9a06g032_clkdesc {
        const char *name;
        uint32_t managed: 1;
        uint32_t type: 3;
        uint32_t index: 8;
        uint32_t source : 8; /* source index + 1 (0 == none) */
        /* these are used to populate the bitsel struct */
        union {
                struct r9a06g032_gate gate;
                /* for dividers */
                struct {
                        unsigned int div_min : 10, div_max : 10, reg: 10;
                        u16 div_table[4];
                };
                /* For fixed-factor ones */
                struct {
                        u16 div, mul;
                };
                unsigned int factor;
                unsigned int frequency;
                /* for dual gate */
                struct {
                        uint16_t group : 1, index: 3;
                        u16 sel, g1, r1, g2, r2;
                } dual;
        };
};

#define I_GATE(_clk, _rst, _rdy, _midle, _scon, _mirack, _mistat) \
        { .gate = _clk, .reset = _rst, \
                .ready = _rdy, .midle = _midle, \
                .scon = _scon, .mirack = _mirack, .mistat = _mistat }
#define D_GATE(_idx, _n, _src, ...) \
        { .type = K_GATE, .index = R9A06G032_##_idx, \
                .source = 1 + R9A06G032_##_src, .name = _n, \
                .gate = I_GATE(__VA_ARGS__) }
#define D_MODULE(_idx, _n, _src, ...) \
        { .type = K_GATE, .index = R9A06G032_##_idx, \
                .source = 1 + R9A06G032_##_src, .name = _n, \
                .managed = 1, .gate = I_GATE(__VA_ARGS__) }
#define D_ROOT(_idx, _n, _mul, _div) \
        { .type = K_FFC, .index = R9A06G032_##_idx, .name = _n, \
                .div = _div, .mul = _mul }
#define D_FFC(_idx, _n, _src, _div) \
        { .type = K_FFC, .index = R9A06G032_##_idx, \
                .source = 1 + R9A06G032_##_src, .name = _n, \
                .div = _div, .mul = 1}
#define D_DIV(_idx, _n, _src, _reg, _min, _max, ...) \
        { .type = K_DIV, .index = R9A06G032_##_idx, \
                .source = 1 + R9A06G032_##_src, .name = _n, \
                .reg = _reg, .div_min = _min, .div_max = _max, \
                .div_table = { __VA_ARGS__ } }
#define D_UGATE(_idx, _n, _src, _g, _gi, _g1, _r1, _g2, _r2) \
        { .type = K_DUALGATE, .index = R9A06G032_##_idx, \
                .source = 1 + R9A06G032_##_src, .name = _n, \
                .dual = { .group = _g, .index = _gi, \
                        .g1 = _g1, .r1 = _r1, .g2 = _g2, .r2 = _r2 }, }

enum { K_GATE = 0, K_FFC, K_DIV, K_BITSEL, K_DUALGATE };

/* Internal clock IDs */
#define R9A06G032_CLKOUT                0
#define R9A06G032_CLKOUT_D10            2
#define R9A06G032_CLKOUT_D16            3
#define R9A06G032_CLKOUT_D160           4
#define R9A06G032_CLKOUT_D1OR2          5
#define R9A06G032_CLKOUT_D20            6
#define R9A06G032_CLKOUT_D40            7
#define R9A06G032_CLKOUT_D5             8
#define R9A06G032_CLKOUT_D8             9
#define R9A06G032_DIV_ADC               10
#define R9A06G032_DIV_I2C               11
#define R9A06G032_DIV_NAND              12
#define R9A06G032_DIV_P1_PG             13
#define R9A06G032_DIV_P2_PG             14
#define R9A06G032_DIV_P3_PG             15
#define R9A06G032_DIV_P4_PG             16
#define R9A06G032_DIV_P5_PG             17
#define R9A06G032_DIV_P6_PG             18
#define R9A06G032_DIV_QSPI0             19
#define R9A06G032_DIV_QSPI1             20
#define R9A06G032_DIV_REF_SYNC          21
#define R9A06G032_DIV_SDIO0             22
#define R9A06G032_DIV_SDIO1             23
#define R9A06G032_DIV_SWITCH            24
#define R9A06G032_DIV_UART              25
#define R9A06G032_DIV_MOTOR             64
#define R9A06G032_CLK_DDRPHY_PLLCLK_D4  78
#define R9A06G032_CLK_ECAT100_D4        79
#define R9A06G032_CLK_HSR100_D2         80
#define R9A06G032_CLK_REF_SYNC_D4       81
#define R9A06G032_CLK_REF_SYNC_D8       82
#define R9A06G032_CLK_SERCOS100_D2      83
#define R9A06G032_DIV_CA7               84

#define R9A06G032_UART_GROUP_012        154
#define R9A06G032_UART_GROUP_34567      155

#define R9A06G032_CLOCK_COUNT           (R9A06G032_UART_GROUP_34567 + 1)

static const struct r9a06g032_clkdesc r9a06g032_clocks[] = {
        D_ROOT(CLKOUT, "clkout", 25, 1),
        D_ROOT(CLK_PLL_USB, "clk_pll_usb", 12, 10),
        D_FFC(CLKOUT_D10, "clkout_d10", CLKOUT, 10),
        D_FFC(CLKOUT_D16, "clkout_d16", CLKOUT, 16),
        D_FFC(CLKOUT_D160, "clkout_d160", CLKOUT, 160),
        D_DIV(CLKOUT_D1OR2, "clkout_d1or2", CLKOUT, 0, 1, 2),
        D_FFC(CLKOUT_D20, "clkout_d20", CLKOUT, 20),
        D_FFC(CLKOUT_D40, "clkout_d40", CLKOUT, 40),
        D_FFC(CLKOUT_D5, "clkout_d5", CLKOUT, 5),
        D_FFC(CLKOUT_D8, "clkout_d8", CLKOUT, 8),
        D_DIV(DIV_ADC, "div_adc", CLKOUT, 77, 50, 250),
        D_DIV(DIV_I2C, "div_i2c", CLKOUT, 78, 12, 16),
        D_DIV(DIV_NAND, "div_nand", CLKOUT, 82, 12, 32),
        D_DIV(DIV_P1_PG, "div_p1_pg", CLKOUT, 68, 12, 200),
        D_DIV(DIV_P2_PG, "div_p2_pg", CLKOUT, 62, 12, 128),
        D_DIV(DIV_P3_PG, "div_p3_pg", CLKOUT, 64, 8, 128),
        D_DIV(DIV_P4_PG, "div_p4_pg", CLKOUT, 66, 8, 128),
        D_DIV(DIV_P5_PG, "div_p5_pg", CLKOUT, 71, 10, 40),
        D_DIV(DIV_P6_PG, "div_p6_pg", CLKOUT, 18, 12, 64),
        D_DIV(DIV_QSPI0, "div_qspi0", CLKOUT, 73, 3, 7),
        D_DIV(DIV_QSPI1, "div_qspi1", CLKOUT, 25, 3, 7),
        D_DIV(DIV_REF_SYNC, "div_ref_sync", CLKOUT, 56, 2, 16, 2, 4, 8, 16),
        D_DIV(DIV_SDIO0, "div_sdio0", CLKOUT, 74, 20, 128),
        D_DIV(DIV_SDIO1, "div_sdio1", CLKOUT, 75, 20, 128),
        D_DIV(DIV_SWITCH, "div_switch", CLKOUT, 37, 5, 40),
        D_DIV(DIV_UART, "div_uart", CLKOUT, 79, 12, 128),
        D_GATE(CLK_25_PG4, "clk_25_pg4", CLKOUT_D40, 0x749, 0x74a, 0x74b, 0, 0xae3, 0, 0),
        D_GATE(CLK_25_PG5, "clk_25_pg5", CLKOUT_D40, 0x74c, 0x74d, 0x74e, 0, 0xae4, 0, 0),
        D_GATE(CLK_25_PG6, "clk_25_pg6", CLKOUT_D40, 0x74f, 0x750, 0x751, 0, 0xae5, 0, 0),
        D_GATE(CLK_25_PG7, "clk_25_pg7", CLKOUT_D40, 0x752, 0x753, 0x754, 0, 0xae6, 0, 0),
        D_GATE(CLK_25_PG8, "clk_25_pg8", CLKOUT_D40, 0x755, 0x756, 0x757, 0, 0xae7, 0, 0),
        D_GATE(CLK_ADC, "clk_adc", DIV_ADC, 0x1ea, 0x1eb, 0, 0, 0, 0, 0),
        D_GATE(CLK_ECAT100, "clk_ecat100", CLKOUT_D10, 0x405, 0, 0, 0, 0, 0, 0),
        D_GATE(CLK_HSR100, "clk_hsr100", CLKOUT_D10, 0x483, 0, 0, 0, 0, 0, 0),
        D_GATE(CLK_I2C0, "clk_i2c0", DIV_I2C, 0x1e6, 0x1e7, 0, 0, 0, 0, 0),
        D_GATE(CLK_I2C1, "clk_i2c1", DIV_I2C, 0x1e8, 0x1e9, 0, 0, 0, 0, 0),
        D_GATE(CLK_MII_REF, "clk_mii_ref", CLKOUT_D40, 0x342, 0, 0, 0, 0, 0, 0),
        D_GATE(CLK_NAND, "clk_nand", DIV_NAND, 0x284, 0x285, 0, 0, 0, 0, 0),
        D_GATE(CLK_NOUSBP2_PG6, "clk_nousbp2_pg6", DIV_P2_PG, 0x774, 0x775, 0, 0, 0, 0, 0),
        D_GATE(CLK_P1_PG2, "clk_p1_pg2", DIV_P1_PG, 0x862, 0x863, 0, 0, 0, 0, 0),
        D_GATE(CLK_P1_PG3, "clk_p1_pg3", DIV_P1_PG, 0x864, 0x865, 0, 0, 0, 0, 0),
        D_GATE(CLK_P1_PG4, "clk_p1_pg4", DIV_P1_PG, 0x866, 0x867, 0, 0, 0, 0, 0),
        D_GATE(CLK_P4_PG3, "clk_p4_pg3", DIV_P4_PG, 0x824, 0x825, 0, 0, 0, 0, 0),
        D_GATE(CLK_P4_PG4, "clk_p4_pg4", DIV_P4_PG, 0x826, 0x827, 0, 0, 0, 0, 0),
        D_GATE(CLK_P6_PG1, "clk_p6_pg1", DIV_P6_PG, 0x8a0, 0x8a1, 0x8a2, 0, 0xb60, 0, 0),
        D_GATE(CLK_P6_PG2, "clk_p6_pg2", DIV_P6_PG, 0x8a3, 0x8a4, 0x8a5, 0, 0xb61, 0, 0),
        D_GATE(CLK_P6_PG3, "clk_p6_pg3", DIV_P6_PG, 0x8a6, 0x8a7, 0x8a8, 0, 0xb62, 0, 0),
        D_GATE(CLK_P6_PG4, "clk_p6_pg4", DIV_P6_PG, 0x8a9, 0x8aa, 0x8ab, 0, 0xb63, 0, 0),
        D_MODULE(CLK_PCI_USB, "clk_pci_usb", CLKOUT_D40, 0xe6, 0, 0, 0, 0, 0, 0),
        D_GATE(CLK_QSPI0, "clk_qspi0", DIV_QSPI0, 0x2a4, 0x2a5, 0, 0, 0, 0, 0),
        D_GATE(CLK_QSPI1, "clk_qspi1", DIV_QSPI1, 0x484, 0x485, 0, 0, 0, 0, 0),
        D_GATE(CLK_RGMII_REF, "clk_rgmii_ref", CLKOUT_D8, 0x340, 0, 0, 0, 0, 0, 0),
        D_GATE(CLK_RMII_REF, "clk_rmii_ref", CLKOUT_D20, 0x341, 0, 0, 0, 0, 0, 0),
        D_GATE(CLK_SDIO0, "clk_sdio0", DIV_SDIO0, 0x64, 0, 0, 0, 0, 0, 0),
        D_GATE(CLK_SDIO1, "clk_sdio1", DIV_SDIO1, 0x644, 0, 0, 0, 0, 0, 0),
        D_GATE(CLK_SERCOS100, "clk_sercos100", CLKOUT_D10, 0x425, 0, 0, 0, 0, 0, 0),
        D_GATE(CLK_SLCD, "clk_slcd", DIV_P1_PG, 0x860, 0x861, 0, 0, 0, 0, 0),
        D_GATE(CLK_SPI0, "clk_spi0", DIV_P3_PG, 0x7e0, 0x7e1, 0, 0, 0, 0, 0),
        D_GATE(CLK_SPI1, "clk_spi1", DIV_P3_PG, 0x7e2, 0x7e3, 0, 0, 0, 0, 0),
        D_GATE(CLK_SPI2, "clk_spi2", DIV_P3_PG, 0x7e4, 0x7e5, 0, 0, 0, 0, 0),
        D_GATE(CLK_SPI3, "clk_spi3", DIV_P3_PG, 0x7e6, 0x7e7, 0, 0, 0, 0, 0),
        D_GATE(CLK_SPI4, "clk_spi4", DIV_P4_PG, 0x820, 0x821, 0, 0, 0, 0, 0),
        D_GATE(CLK_SPI5, "clk_spi5", DIV_P4_PG, 0x822, 0x823, 0, 0, 0, 0, 0),
        D_GATE(CLK_SWITCH, "clk_switch", DIV_SWITCH, 0x982, 0x983, 0, 0, 0, 0, 0),
        D_DIV(DIV_MOTOR, "div_motor", CLKOUT_D5, 84, 2, 8),
        D_MODULE(HCLK_ECAT125, "hclk_ecat125", CLKOUT_D8, 0x400, 0x401, 0, 0x402, 0, 0x440, 0x441),
        D_MODULE(HCLK_PINCONFIG, "hclk_pinconfig", CLKOUT_D40, 0x740, 0x741, 0x742, 0, 0xae0, 0, 0),
        D_MODULE(HCLK_SERCOS, "hclk_sercos", CLKOUT_D10, 0x420, 0x422, 0, 0x421, 0, 0x460, 0x461),
        D_MODULE(HCLK_SGPIO2, "hclk_sgpio2", DIV_P5_PG, 0x8c3, 0x8c4, 0x8c5, 0, 0xb41, 0, 0),
        D_MODULE(HCLK_SGPIO3, "hclk_sgpio3", DIV_P5_PG, 0x8c6, 0x8c7, 0x8c8, 0, 0xb42, 0, 0),
        D_MODULE(HCLK_SGPIO4, "hclk_sgpio4", DIV_P5_PG, 0x8c9, 0x8ca, 0x8cb, 0, 0xb43, 0, 0),
        D_MODULE(HCLK_TIMER0, "hclk_timer0", CLKOUT_D40, 0x743, 0x744, 0x745, 0, 0xae1, 0, 0),
        D_MODULE(HCLK_TIMER1, "hclk_timer1", CLKOUT_D40, 0x746, 0x747, 0x748, 0, 0xae2, 0, 0),
        D_MODULE(HCLK_USBF, "hclk_usbf", CLKOUT_D8, 0xe3, 0, 0, 0xe4, 0, 0x102, 0x103),
        D_MODULE(HCLK_USBH, "hclk_usbh", CLKOUT_D8, 0xe0, 0xe1, 0, 0xe2, 0, 0x100, 0x101),
        D_MODULE(HCLK_USBPM, "hclk_usbpm", CLKOUT_D8, 0xe5, 0, 0, 0, 0, 0, 0),
        D_GATE(CLK_48_PG_F, "clk_48_pg_f", CLK_48, 0x78c, 0x78d, 0, 0x78e, 0, 0xb04, 0xb05),
        D_GATE(CLK_48_PG4, "clk_48_pg4", CLK_48, 0x789, 0x78a, 0x78b, 0, 0xb03, 0, 0),
        D_FFC(CLK_DDRPHY_PLLCLK_D4, "clk_ddrphy_pllclk_d4", CLK_DDRPHY_PLLCLK, 4),
        D_FFC(CLK_ECAT100_D4, "clk_ecat100_d4", CLK_ECAT100, 4),
        D_FFC(CLK_HSR100_D2, "clk_hsr100_d2", CLK_HSR100, 2),
        D_FFC(CLK_REF_SYNC_D4, "clk_ref_sync_d4", CLK_REF_SYNC, 4),
        D_FFC(CLK_REF_SYNC_D8, "clk_ref_sync_d8", CLK_REF_SYNC, 8),
        D_FFC(CLK_SERCOS100_D2, "clk_sercos100_d2", CLK_SERCOS100, 2),
        D_DIV(DIV_CA7, "div_ca7", CLK_REF_SYNC, 57, 1, 4, 1, 2, 4),
        D_MODULE(HCLK_CAN0, "hclk_can0", CLK_48, 0x783, 0x784, 0x785, 0, 0xb01, 0, 0),
        D_MODULE(HCLK_CAN1, "hclk_can1", CLK_48, 0x786, 0x787, 0x788, 0, 0xb02, 0, 0),
        D_MODULE(HCLK_DELTASIGMA, "hclk_deltasigma", DIV_MOTOR, 0x1ef, 0x1f0, 0x1f1, 0, 0, 0, 0),
        D_MODULE(HCLK_PWMPTO, "hclk_pwmpto", DIV_MOTOR, 0x1ec, 0x1ed, 0x1ee, 0, 0, 0, 0),
        D_MODULE(HCLK_RSV, "hclk_rsv", CLK_48, 0x780, 0x781, 0x782, 0, 0xb00, 0, 0),
        D_MODULE(HCLK_SGPIO0, "hclk_sgpio0", DIV_MOTOR, 0x1e0, 0x1e1, 0x1e2, 0, 0, 0, 0),
        D_MODULE(HCLK_SGPIO1, "hclk_sgpio1", DIV_MOTOR, 0x1e3, 0x1e4, 0x1e5, 0, 0, 0, 0),
        D_DIV(RTOS_MDC, "rtos_mdc", CLK_REF_SYNC, 100, 80, 640, 80, 160, 320, 640),
        D_GATE(CLK_CM3, "clk_cm3", CLK_REF_SYNC_D4, 0xba0, 0xba1, 0, 0xba2, 0, 0xbc0, 0xbc1),
        D_GATE(CLK_DDRC, "clk_ddrc", CLK_DDRPHY_PLLCLK_D4, 0x323, 0x324, 0, 0, 0, 0, 0),
        D_GATE(CLK_ECAT25, "clk_ecat25", CLK_ECAT100_D4, 0x403, 0x404, 0, 0, 0, 0, 0),
        D_GATE(CLK_HSR50, "clk_hsr50", CLK_HSR100_D2, 0x484, 0x485, 0, 0, 0, 0, 0),
        D_GATE(CLK_HW_RTOS, "clk_hw_rtos", CLK_REF_SYNC_D4, 0xc60, 0xc61, 0, 0, 0, 0, 0),
        D_GATE(CLK_SERCOS50, "clk_sercos50", CLK_SERCOS100_D2, 0x424, 0x423, 0, 0, 0, 0, 0),
        D_MODULE(HCLK_ADC, "hclk_adc", CLK_REF_SYNC_D8, 0x1af, 0x1b0, 0x1b1, 0, 0, 0, 0),
        D_MODULE(HCLK_CM3, "hclk_cm3", CLK_REF_SYNC_D4, 0xc20, 0xc21, 0xc22, 0, 0, 0, 0),
        D_MODULE(HCLK_CRYPTO_EIP150, "hclk_crypto_eip150", CLK_REF_SYNC_D4, 0x123, 0x124, 0x125, 0, 0x142, 0, 0),
        D_MODULE(HCLK_CRYPTO_EIP93, "hclk_crypto_eip93", CLK_REF_SYNC_D4, 0x120, 0x121, 0, 0x122, 0, 0x140, 0x141),
        D_MODULE(HCLK_DDRC, "hclk_ddrc", CLK_REF_SYNC_D4, 0x320, 0x322, 0, 0x321, 0, 0x3a0, 0x3a1),
        D_MODULE(HCLK_DMA0, "hclk_dma0", CLK_REF_SYNC_D4, 0x260, 0x261, 0x262, 0x263, 0x2c0, 0x2c1, 0x2c2),
        D_MODULE(HCLK_DMA1, "hclk_dma1", CLK_REF_SYNC_D4, 0x264, 0x265, 0x266, 0x267, 0x2c3, 0x2c4, 0x2c5),
        D_MODULE(HCLK_GMAC0, "hclk_gmac0", CLK_REF_SYNC_D4, 0x360, 0x361, 0x362, 0x363, 0x3c0, 0x3c1, 0x3c2),
        D_MODULE(HCLK_GMAC1, "hclk_gmac1", CLK_REF_SYNC_D4, 0x380, 0x381, 0x382, 0x383, 0x3e0, 0x3e1, 0x3e2),
        D_MODULE(HCLK_GPIO0, "hclk_gpio0", CLK_REF_SYNC_D4, 0x212, 0x213, 0x214, 0, 0, 0, 0),
        D_MODULE(HCLK_GPIO1, "hclk_gpio1", CLK_REF_SYNC_D4, 0x215, 0x216, 0x217, 0, 0, 0, 0),
        D_MODULE(HCLK_GPIO2, "hclk_gpio2", CLK_REF_SYNC_D4, 0x229, 0x22a, 0x22b, 0, 0, 0, 0),
        D_MODULE(HCLK_HSR, "hclk_hsr", CLK_HSR100_D2, 0x480, 0x482, 0, 0x481, 0, 0x4c0, 0x4c1),
        D_MODULE(HCLK_I2C0, "hclk_i2c0", CLK_REF_SYNC_D8, 0x1a9, 0x1aa, 0x1ab, 0, 0, 0, 0),
        D_MODULE(HCLK_I2C1, "hclk_i2c1", CLK_REF_SYNC_D8, 0x1ac, 0x1ad, 0x1ae, 0, 0, 0, 0),
        D_MODULE(HCLK_LCD, "hclk_lcd", CLK_REF_SYNC_D4, 0x7a0, 0x7a1, 0x7a2, 0, 0xb20, 0, 0),
        D_MODULE(HCLK_MSEBI_M, "hclk_msebi_m", CLK_REF_SYNC_D4, 0x164, 0x165, 0x166, 0, 0x183, 0, 0),
        D_MODULE(HCLK_MSEBI_S, "hclk_msebi_s", CLK_REF_SYNC_D4, 0x160, 0x161, 0x162, 0x163, 0x180, 0x181, 0x182),
        D_MODULE(HCLK_NAND, "hclk_nand", CLK_REF_SYNC_D4, 0x280, 0x281, 0x282, 0x283, 0x2e0, 0x2e1, 0x2e2),
        D_MODULE(HCLK_PG_I, "hclk_pg_i", CLK_REF_SYNC_D4, 0x7ac, 0x7ad, 0, 0x7ae, 0, 0xb24, 0xb25),
        D_MODULE(HCLK_PG19, "hclk_pg19", CLK_REF_SYNC_D4, 0x22c, 0x22d, 0x22e, 0, 0, 0, 0),
        D_MODULE(HCLK_PG20, "hclk_pg20", CLK_REF_SYNC_D4, 0x22f, 0x230, 0x231, 0, 0, 0, 0),
        D_MODULE(HCLK_PG3, "hclk_pg3", CLK_REF_SYNC_D4, 0x7a6, 0x7a7, 0x7a8, 0, 0xb22, 0, 0),
        D_MODULE(HCLK_PG4, "hclk_pg4", CLK_REF_SYNC_D4, 0x7a9, 0x7aa, 0x7ab, 0, 0xb23, 0, 0),
        D_MODULE(HCLK_QSPI0, "hclk_qspi0", CLK_REF_SYNC_D4, 0x2a0, 0x2a1, 0x2a2, 0x2a3, 0x300, 0x301, 0x302),
        D_MODULE(HCLK_QSPI1, "hclk_qspi1", CLK_REF_SYNC_D4, 0x480, 0x481, 0x482, 0x483, 0x4c0, 0x4c1, 0x4c2),
        D_MODULE(HCLK_ROM, "hclk_rom", CLK_REF_SYNC_D4, 0xaa0, 0xaa1, 0xaa2, 0, 0xb80, 0, 0),
        D_MODULE(HCLK_RTC, "hclk_rtc", CLK_REF_SYNC_D8, 0xa00, 0, 0, 0, 0, 0, 0),
        D_MODULE(HCLK_SDIO0, "hclk_sdio0", CLK_REF_SYNC_D4, 0x60, 0x61, 0x62, 0x63, 0x80, 0x81, 0x82),
        D_MODULE(HCLK_SDIO1, "hclk_sdio1", CLK_REF_SYNC_D4, 0x640, 0x641, 0x642, 0x643, 0x660, 0x661, 0x662),
        D_MODULE(HCLK_SEMAP, "hclk_semap", CLK_REF_SYNC_D4, 0x7a3, 0x7a4, 0x7a5, 0, 0xb21, 0, 0),
        D_MODULE(HCLK_SPI0, "hclk_spi0", CLK_REF_SYNC_D4, 0x200, 0x201, 0x202, 0, 0, 0, 0),
        D_MODULE(HCLK_SPI1, "hclk_spi1", CLK_REF_SYNC_D4, 0x203, 0x204, 0x205, 0, 0, 0, 0),
        D_MODULE(HCLK_SPI2, "hclk_spi2", CLK_REF_SYNC_D4, 0x206, 0x207, 0x208, 0, 0, 0, 0),
        D_MODULE(HCLK_SPI3, "hclk_spi3", CLK_REF_SYNC_D4, 0x209, 0x20a, 0x20b, 0, 0, 0, 0),
        D_MODULE(HCLK_SPI4, "hclk_spi4", CLK_REF_SYNC_D4, 0x20c, 0x20d, 0x20e, 0, 0, 0, 0),
        D_MODULE(HCLK_SPI5, "hclk_spi5", CLK_REF_SYNC_D4, 0x20f, 0x210, 0x211, 0, 0, 0, 0),
        D_MODULE(HCLK_SWITCH, "hclk_switch", CLK_REF_SYNC_D4, 0x980, 0, 0x981, 0, 0, 0, 0),
        D_MODULE(HCLK_SWITCH_RG, "hclk_switch_rg", CLK_REF_SYNC_D4, 0xc40, 0xc41, 0xc42, 0, 0, 0, 0),
        D_MODULE(HCLK_UART0, "hclk_uart0", CLK_REF_SYNC_D8, 0x1a0, 0x1a1, 0x1a2, 0, 0, 0, 0),
        D_MODULE(HCLK_UART1, "hclk_uart1", CLK_REF_SYNC_D8, 0x1a3, 0x1a4, 0x1a5, 0, 0, 0, 0),
        D_MODULE(HCLK_UART2, "hclk_uart2", CLK_REF_SYNC_D8, 0x1a6, 0x1a7, 0x1a8, 0, 0, 0, 0),
        D_MODULE(HCLK_UART3, "hclk_uart3", CLK_REF_SYNC_D4, 0x218, 0x219, 0x21a, 0, 0, 0, 0),
        D_MODULE(HCLK_UART4, "hclk_uart4", CLK_REF_SYNC_D4, 0x21b, 0x21c, 0x21d, 0, 0, 0, 0),
        D_MODULE(HCLK_UART5, "hclk_uart5", CLK_REF_SYNC_D4, 0x220, 0x221, 0x222, 0, 0, 0, 0),
        D_MODULE(HCLK_UART6, "hclk_uart6", CLK_REF_SYNC_D4, 0x223, 0x224, 0x225, 0, 0, 0, 0),
        D_MODULE(HCLK_UART7, "hclk_uart7", CLK_REF_SYNC_D4, 0x226, 0x227, 0x228, 0, 0, 0, 0),
        /*
         * These are not hardware clocks, but are needed to handle the special
         * case where we have a 'selector bit' that doesn't just change the
         * parent for a clock, but also the gate it's suposed to use.
         */
        {
                .index = R9A06G032_UART_GROUP_012,
                .name = "uart_group_012",
                .type = K_BITSEL,
                .source = 1 + R9A06G032_DIV_UART,
                /* R9A06G032_SYSCTRL_REG_PWRCTRL_PG1_PR2 */
                .dual.sel = ((0xec / 4) << 5) | 24,
                .dual.group = 0,
        },
        {
                .index = R9A06G032_UART_GROUP_34567,
                .name = "uart_group_34567",
                .type = K_BITSEL,
                .source = 1 + R9A06G032_DIV_P2_PG,
                /* R9A06G032_SYSCTRL_REG_PWRCTRL_PG0_0 */
                .dual.sel = ((0x34 / 4) << 5) | 30,
                .dual.group = 1,
        },
        D_UGATE(CLK_UART0, "clk_uart0", UART_GROUP_012, 0, 0, 0x1b2, 0x1b3, 0x1b4, 0x1b5),
        D_UGATE(CLK_UART1, "clk_uart1", UART_GROUP_012, 0, 1, 0x1b6, 0x1b7, 0x1b8, 0x1b9),
        D_UGATE(CLK_UART2, "clk_uart2", UART_GROUP_012, 0, 2, 0x1ba, 0x1bb, 0x1bc, 0x1bd),
        D_UGATE(CLK_UART3, "clk_uart3", UART_GROUP_34567, 1, 0, 0x760, 0x761, 0x762, 0x763),
        D_UGATE(CLK_UART4, "clk_uart4", UART_GROUP_34567, 1, 1, 0x764, 0x765, 0x766, 0x767),
        D_UGATE(CLK_UART5, "clk_uart5", UART_GROUP_34567, 1, 2, 0x768, 0x769, 0x76a, 0x76b),
        D_UGATE(CLK_UART6, "clk_uart6", UART_GROUP_34567, 1, 3, 0x76c, 0x76d, 0x76e, 0x76f),
        D_UGATE(CLK_UART7, "clk_uart7", UART_GROUP_34567, 1, 4, 0x770, 0x771, 0x772, 0x773),
};

struct r9a06g032_priv {
        struct clk_onecell_data data;
        spinlock_t lock; /* protects concurent access to gates */
        void __iomem *reg;
};

/* register/bit pairs are encoded as an uint16_t */
static void
clk_rdesc_set(struct r9a06g032_priv *clocks,
              u16 one, unsigned int on)
{
        u32 __iomem *reg = clocks->reg + (4 * (one >> 5));
        u32 val = readl(reg);

        val = (val & ~(1U << (one & 0x1f))) | ((!!on) << (one & 0x1f));
        writel(val, reg);
}

static int
clk_rdesc_get(struct r9a06g032_priv *clocks,
              uint16_t one)
{
        u32 __iomem *reg = clocks->reg + (4 * (one >> 5));
        u32 val = readl(reg);

        return !!(val & (1U << (one & 0x1f)));
}

/*
 * This implements the R9A06G032 clock gate 'driver'. We cannot use the system's
 * clock gate framework as the gates on the R9A06G032 have a special enabling
 * sequence, therefore we use this little proxy.
 */
struct r9a06g032_clk_gate {
        struct clk_hw hw;
        struct r9a06g032_priv *clocks;
        u16 index;

        struct r9a06g032_gate gate;
};

#define to_r9a06g032_gate(_hw) container_of(_hw, struct r9a06g032_clk_gate, hw)

static int create_add_module_clock(struct of_phandle_args *clkspec,
                                   struct device *dev)
{
        struct clk *clk;
        int error;

        clk = of_clk_get_from_provider(clkspec);
        if (IS_ERR(clk))
                return PTR_ERR(clk);

        error = pm_clk_create(dev);
        if (error) {
                clk_put(clk);
                return error;
        }

        error = pm_clk_add_clk(dev, clk);
        if (error) {
                pm_clk_destroy(dev);
                clk_put(clk);
        }

        return error;
}

static int r9a06g032_attach_dev(struct generic_pm_domain *pd,
                                struct device *dev)
{
        struct device_node *np = dev->of_node;
        struct of_phandle_args clkspec;
        int i = 0;
        int error;
        int index;

        while (!of_parse_phandle_with_args(np, "clocks", "#clock-cells", i,
                                           &clkspec)) {
                if (clkspec.np != pd->dev.of_node)
                        continue;

                index = clkspec.args[0];
                if (index < R9A06G032_CLOCK_COUNT &&
                    r9a06g032_clocks[index].managed) {
                        error = create_add_module_clock(&clkspec, dev);
                        of_node_put(clkspec.np);
                        if (error)
                                return error;
                }
                i++;
        }

        return 0;
}

static void r9a06g032_detach_dev(struct generic_pm_domain *unused, struct device *dev)
{
        if (!pm_clk_no_clocks(dev))
                pm_clk_destroy(dev);
}

static int r9a06g032_add_clk_domain(struct device *dev)
{
        struct device_node *np = dev->of_node;
        struct generic_pm_domain *pd;

        pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
        if (!pd)
                return -ENOMEM;

        pd->name = np->name;
        pd->flags = GENPD_FLAG_PM_CLK | GENPD_FLAG_ALWAYS_ON |
                    GENPD_FLAG_ACTIVE_WAKEUP;
        pd->attach_dev = r9a06g032_attach_dev;
        pd->detach_dev = r9a06g032_detach_dev;
        pm_genpd_init(pd, &pm_domain_always_on_gov, false);

        of_genpd_add_provider_simple(np, pd);
        return 0;
}

static void
r9a06g032_clk_gate_set(struct r9a06g032_priv *clocks,
                       struct r9a06g032_gate *g, int on)
{
        unsigned long flags;

        WARN_ON(!g->gate);

        spin_lock_irqsave(&clocks->lock, flags);
        clk_rdesc_set(clocks, g->gate, on);
        /* De-assert reset */
        if (g->reset)
                clk_rdesc_set(clocks, g->reset, 1);
        spin_unlock_irqrestore(&clocks->lock, flags);

        /* Hardware manual recommends 5us delay after enabling clock & reset */
        udelay(5);

        /* If the peripheral is memory mapped (i.e. an AXI slave), there is an
         * associated SLVRDY bit in the System Controller that needs to be set
         * so that the FlexWAY bus fabric passes on the read/write requests.
         */
        if (g->ready || g->midle) {
                spin_lock_irqsave(&clocks->lock, flags);
                if (g->ready)
                        clk_rdesc_set(clocks, g->ready, on);
                /* Clear 'Master Idle Request' bit */
                if (g->midle)
                        clk_rdesc_set(clocks, g->midle, !on);
                spin_unlock_irqrestore(&clocks->lock, flags);
        }
        /* Note: We don't wait for FlexWAY Socket Connection signal */
}

static int r9a06g032_clk_gate_enable(struct clk_hw *hw)
{
        struct r9a06g032_clk_gate *g = to_r9a06g032_gate(hw);

        r9a06g032_clk_gate_set(g->clocks, &g->gate, 1);
        return 0;
}

static void r9a06g032_clk_gate_disable(struct clk_hw *hw)
{
        struct r9a06g032_clk_gate *g = to_r9a06g032_gate(hw);

        r9a06g032_clk_gate_set(g->clocks, &g->gate, 0);
}

static int r9a06g032_clk_gate_is_enabled(struct clk_hw *hw)
{
        struct r9a06g032_clk_gate *g = to_r9a06g032_gate(hw);

        /* if clock is in reset, the gate might be on, and still not 'be' on */
        if (g->gate.reset && !clk_rdesc_get(g->clocks, g->gate.reset))
                return 0;

        return clk_rdesc_get(g->clocks, g->gate.gate);
}

static const struct clk_ops r9a06g032_clk_gate_ops = {
        .enable = r9a06g032_clk_gate_enable,
        .disable = r9a06g032_clk_gate_disable,
        .is_enabled = r9a06g032_clk_gate_is_enabled,
};

static struct clk *
r9a06g032_register_gate(struct r9a06g032_priv *clocks,
                        const char *parent_name,
                        const struct r9a06g032_clkdesc *desc)
{
        struct clk *clk;
        struct r9a06g032_clk_gate *g;
        struct clk_init_data init;

        g = kzalloc(sizeof(*g), GFP_KERNEL);
        if (!g)
                return NULL;

        init.name = desc->name;
        init.ops = &r9a06g032_clk_gate_ops;
        init.flags = CLK_SET_RATE_PARENT;
        init.parent_names = parent_name ? &parent_name : NULL;
        init.num_parents = parent_name ? 1 : 0;

        g->clocks = clocks;
        g->index = desc->index;
        g->gate = desc->gate;
        g->hw.init = &init;

        /*
         * important here, some clocks are already in use by the CM3, we
         * have to assume they are not Linux's to play with and try to disable
         * at the end of the boot!
         */
        if (r9a06g032_clk_gate_is_enabled(&g->hw)) {
                init.flags |= CLK_IS_CRITICAL;
                pr_debug("%s was enabled, making read-only\n", desc->name);
        }

        clk = clk_register(NULL, &g->hw);
        if (IS_ERR(clk)) {
                kfree(g);
                return NULL;
        }
        return clk;
}

struct r9a06g032_clk_div {
        struct clk_hw hw;
        struct r9a06g032_priv *clocks;
        u16 index;
        u16 reg;
        u16 min, max;
        u8 table_size;
        u16 table[8];   /* we know there are no more than 8 */
};

#define to_r9a06g032_div(_hw) \
                container_of(_hw, struct r9a06g032_clk_div, hw)

static unsigned long
r9a06g032_div_recalc_rate(struct clk_hw *hw,
                          unsigned long parent_rate)
{
        struct r9a06g032_clk_div *clk = to_r9a06g032_div(hw);
        u32 __iomem *reg = clk->clocks->reg + (4 * clk->reg);
        u32 div = readl(reg);

        if (div < clk->min)
                div = clk->min;
        else if (div > clk->max)
                div = clk->max;
        return DIV_ROUND_UP(parent_rate, div);
}

/*
 * Attempts to find a value that is in range of min,max,
 * and if a table of set dividers was specified for this
 * register, try to find the fixed divider that is the closest
 * to the target frequency
 */
static long
r9a06g032_div_clamp_div(struct r9a06g032_clk_div *clk,
                        unsigned long rate, unsigned long prate)
{
        /* + 1 to cope with rates that have the remainder dropped */
        u32 div = DIV_ROUND_UP(prate, rate + 1);
        int i;

        if (div <= clk->min)
                return clk->min;
        if (div >= clk->max)
                return clk->max;

        for (i = 0; clk->table_size && i < clk->table_size - 1; i++) {
                if (div >= clk->table[i] && div <= clk->table[i + 1]) {
                        unsigned long m = rate -
                                DIV_ROUND_UP(prate, clk->table[i]);
                        unsigned long p =
                                DIV_ROUND_UP(prate, clk->table[i + 1]) -
                                rate;
                        /*
                         * select the divider that generates
                         * the value closest to the ideal frequency
                         */
                        div = p >= m ? clk->table[i] : clk->table[i + 1];
                        return div;
                }
        }
        return div;
}

static long
r9a06g032_div_round_rate(struct clk_hw *hw,
                         unsigned long rate, unsigned long *prate)
{
        struct r9a06g032_clk_div *clk = to_r9a06g032_div(hw);
        u32 div = DIV_ROUND_UP(*prate, rate);

        pr_devel("%s %pC %ld (prate %ld) (wanted div %u)\n", __func__,
                 hw->clk, rate, *prate, div);
        pr_devel("   min %d (%ld) max %d (%ld)\n",
                 clk->min, DIV_ROUND_UP(*prate, clk->min),
                clk->max, DIV_ROUND_UP(*prate, clk->max));

        div = r9a06g032_div_clamp_div(clk, rate, *prate);
        /*
         * this is a hack. Currently the serial driver asks for a clock rate
         * that is 16 times the baud rate -- and that is wildly outside the
         * range of the UART divider, somehow there is no provision for that
         * case of 'let the divider as is if outside range'.
         * The serial driver *shouldn't* play with these clocks anyway, there's
         * several uarts attached to this divider, and changing this impacts
         * everyone.
         */
        if (clk->index == R9A06G032_DIV_UART ||
            clk->index == R9A06G032_DIV_P2_PG) {
                pr_devel("%s div uart hack!\n", __func__);
                return clk_get_rate(hw->clk);
        }
        pr_devel("%s %pC %ld / %u = %ld\n", __func__, hw->clk,
                 *prate, div, DIV_ROUND_UP(*prate, div));
        return DIV_ROUND_UP(*prate, div);
}

static int
r9a06g032_div_set_rate(struct clk_hw *hw,
                       unsigned long rate, unsigned long parent_rate)
{
        struct r9a06g032_clk_div *clk = to_r9a06g032_div(hw);
        /* + 1 to cope with rates that have the remainder dropped */
        u32 div = DIV_ROUND_UP(parent_rate, rate + 1);
        u32 __iomem *reg = clk->clocks->reg + (4 * clk->reg);

        pr_devel("%s %pC rate %ld parent %ld div %d\n", __func__, hw->clk,
                 rate, parent_rate, div);

        /*
         * Need to write the bit 31 with the divider value to
         * latch it. Technically we should wait until it has been
         * cleared too.
         * TODO: Find whether this callback is sleepable, in case
         * the hardware /does/ require some sort of spinloop here.
         */
        writel(div | BIT(31), reg);

        return 0;
}

static const struct clk_ops r9a06g032_clk_div_ops = {
        .recalc_rate = r9a06g032_div_recalc_rate,
        .round_rate = r9a06g032_div_round_rate,
        .set_rate = r9a06g032_div_set_rate,
};

static struct clk *
r9a06g032_register_div(struct r9a06g032_priv *clocks,
                       const char *parent_name,
                       const struct r9a06g032_clkdesc *desc)
{
        struct r9a06g032_clk_div *div;
        struct clk *clk;
        struct clk_init_data init;
        unsigned int i;

        div = kzalloc(sizeof(*div), GFP_KERNEL);
        if (!div)
                return NULL;

        init.name = desc->name;
        init.ops = &r9a06g032_clk_div_ops;
        init.flags = CLK_SET_RATE_PARENT;
        init.parent_names = parent_name ? &parent_name : NULL;
        init.num_parents = parent_name ? 1 : 0;

        div->clocks = clocks;
        div->index = desc->index;
        div->reg = desc->reg;
        div->hw.init = &init;
        div->min = desc->div_min;
        div->max = desc->div_max;
        /* populate (optional) divider table fixed values */
        for (i = 0; i < ARRAY_SIZE(div->table) &&
             i < ARRAY_SIZE(desc->div_table) && desc->div_table[i]; i++) {
                div->table[div->table_size++] = desc->div_table[i];
        }

        clk = clk_register(NULL, &div->hw);
        if (IS_ERR(clk)) {
                kfree(div);
                return NULL;
        }
        return clk;
}

/*
 * This clock provider handles the case of the R9A06G032 where you have
 * peripherals that have two potential clock source and two gates, one for
 * each of the clock source - the used clock source (for all sub clocks)
 * is selected by a single bit.
 * That single bit affects all sub-clocks, and therefore needs to change the
 * active gate (and turn the others off) and force a recalculation of the rates.
 *
 * This implements two clock providers, one 'bitselect' that
 * handles the switch between both parents, and another 'dualgate'
 * that knows which gate to poke at, depending on the parent's bit position.
 */
struct r9a06g032_clk_bitsel {
        struct clk_hw   hw;
        struct r9a06g032_priv *clocks;
        u16 index;
        u16 selector;           /* selector register + bit */
};

#define to_clk_bitselect(_hw) \
                container_of(_hw, struct r9a06g032_clk_bitsel, hw)

static u8 r9a06g032_clk_mux_get_parent(struct clk_hw *hw)
{
        struct r9a06g032_clk_bitsel *set = to_clk_bitselect(hw);

        return clk_rdesc_get(set->clocks, set->selector);
}

static int r9a06g032_clk_mux_set_parent(struct clk_hw *hw, u8 index)
{
        struct r9a06g032_clk_bitsel *set = to_clk_bitselect(hw);

        /* a single bit in the register selects one of two parent clocks */
        clk_rdesc_set(set->clocks, set->selector, !!index);

        return 0;
}

static const struct clk_ops clk_bitselect_ops = {
        .get_parent = r9a06g032_clk_mux_get_parent,
        .set_parent = r9a06g032_clk_mux_set_parent,
};

static struct clk *
r9a06g032_register_bitsel(struct r9a06g032_priv *clocks,
                          const char *parent_name,
                          const struct r9a06g032_clkdesc *desc)
{
        struct clk *clk;
        struct r9a06g032_clk_bitsel *g;
        struct clk_init_data init;
        const char *names[2];

        /* allocate the gate */
        g = kzalloc(sizeof(*g), GFP_KERNEL);
        if (!g)
                return NULL;

        names[0] = parent_name;
        names[1] = "clk_pll_usb";

        init.name = desc->name;
        init.ops = &clk_bitselect_ops;
        init.flags = CLK_SET_RATE_PARENT;
        init.parent_names = names;
        init.num_parents = 2;

        g->clocks = clocks;
        g->index = desc->index;
        g->selector = desc->dual.sel;
        g->hw.init = &init;

        clk = clk_register(NULL, &g->hw);
        if (IS_ERR(clk)) {
                kfree(g);
                return NULL;
        }
        return clk;
}

struct r9a06g032_clk_dualgate {
        struct clk_hw   hw;
        struct r9a06g032_priv *clocks;
        u16 index;
        u16 selector;           /* selector register + bit */
        struct r9a06g032_gate gate[2];
};

#define to_clk_dualgate(_hw) \
                container_of(_hw, struct r9a06g032_clk_dualgate, hw)

static int
r9a06g032_clk_dualgate_setenable(struct r9a06g032_clk_dualgate *g, int enable)
{
        u8 sel_bit = clk_rdesc_get(g->clocks, g->selector);

        /* we always turn off the 'other' gate, regardless */
        r9a06g032_clk_gate_set(g->clocks, &g->gate[!sel_bit], 0);
        r9a06g032_clk_gate_set(g->clocks, &g->gate[sel_bit], enable);

        return 0;
}

static int r9a06g032_clk_dualgate_enable(struct clk_hw *hw)
{
        struct r9a06g032_clk_dualgate *gate = to_clk_dualgate(hw);

        r9a06g032_clk_dualgate_setenable(gate, 1);

        return 0;
}

static void r9a06g032_clk_dualgate_disable(struct clk_hw *hw)
{
        struct r9a06g032_clk_dualgate *gate = to_clk_dualgate(hw);

        r9a06g032_clk_dualgate_setenable(gate, 0);
}

static int r9a06g032_clk_dualgate_is_enabled(struct clk_hw *hw)
{
        struct r9a06g032_clk_dualgate *g = to_clk_dualgate(hw);
        u8 sel_bit = clk_rdesc_get(g->clocks, g->selector);

        return clk_rdesc_get(g->clocks, g->gate[sel_bit].gate);
}

static const struct clk_ops r9a06g032_clk_dualgate_ops = {
        .enable = r9a06g032_clk_dualgate_enable,
        .disable = r9a06g032_clk_dualgate_disable,
        .is_enabled = r9a06g032_clk_dualgate_is_enabled,
};

static struct clk *
r9a06g032_register_dualgate(struct r9a06g032_priv *clocks,
                            const char *parent_name,
                            const struct r9a06g032_clkdesc *desc,
                            uint16_t sel)
{
        struct r9a06g032_clk_dualgate *g;
        struct clk *clk;
        struct clk_init_data init;

        /* allocate the gate */
        g = kzalloc(sizeof(*g), GFP_KERNEL);
        if (!g)
                return NULL;
        g->clocks = clocks;
        g->index = desc->index;
        g->selector = sel;
        g->gate[0].gate = desc->dual.g1;
        g->gate[0].reset = desc->dual.r1;
        g->gate[1].gate = desc->dual.g2;
        g->gate[1].reset = desc->dual.r2;

        init.name = desc->name;
        init.ops = &r9a06g032_clk_dualgate_ops;
        init.flags = CLK_SET_RATE_PARENT;
        init.parent_names = &parent_name;
        init.num_parents = 1;
        g->hw.init = &init;
        /*
         * important here, some clocks are already in use by the CM3, we
         * have to assume they are not Linux's to play with and try to disable
         * at the end of the boot!
         */
        if (r9a06g032_clk_dualgate_is_enabled(&g->hw)) {
                init.flags |= CLK_IS_CRITICAL;
                pr_debug("%s was enabled, making read-only\n", desc->name);
        }

        clk = clk_register(NULL, &g->hw);
        if (IS_ERR(clk)) {
                kfree(g);
                return NULL;
        }
        return clk;
}

static void r9a06g032_clocks_del_clk_provider(void *data)
{
        of_clk_del_provider(data);
}

static int __init r9a06g032_clocks_probe(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct device_node *np = dev->of_node;
        struct r9a06g032_priv *clocks;
        struct clk **clks;
        struct clk *mclk;
        unsigned int i;
        u16 uart_group_sel[2];
        int error;

        clocks = devm_kzalloc(dev, sizeof(*clocks), GFP_KERNEL);
        clks = devm_kcalloc(dev, R9A06G032_CLOCK_COUNT, sizeof(struct clk *),
                            GFP_KERNEL);
        if (!clocks || !clks)
                return -ENOMEM;

        spin_lock_init(&clocks->lock);

        clocks->data.clks = clks;
        clocks->data.clk_num = R9A06G032_CLOCK_COUNT;

        mclk = devm_clk_get(dev, "mclk");
        if (IS_ERR(mclk))
                return PTR_ERR(mclk);

        clocks->reg = of_iomap(np, 0);
        if (WARN_ON(!clocks->reg))
                return -ENOMEM;
        for (i = 0; i < ARRAY_SIZE(r9a06g032_clocks); ++i) {
                const struct r9a06g032_clkdesc *d = &r9a06g032_clocks[i];
                const char *parent_name = d->source ?
                        __clk_get_name(clocks->data.clks[d->source - 1]) :
                        __clk_get_name(mclk);
                struct clk *clk = NULL;

                switch (d->type) {
                case K_FFC:
                        clk = clk_register_fixed_factor(NULL, d->name,
                                                        parent_name, 0,
                                                        d->mul, d->div);
                        break;
                case K_GATE:
                        clk = r9a06g032_register_gate(clocks, parent_name, d);
                        break;
                case K_DIV:
                        clk = r9a06g032_register_div(clocks, parent_name, d);
                        break;
                case K_BITSEL:
                        /* keep that selector register around */
                        uart_group_sel[d->dual.group] = d->dual.sel;
                        clk = r9a06g032_register_bitsel(clocks, parent_name, d);
                        break;
                case K_DUALGATE:
                        clk = r9a06g032_register_dualgate(clocks, parent_name,
                                                          d,
                                                          uart_group_sel[d->dual.group]);
                        break;
                }
                clocks->data.clks[d->index] = clk;
        }
        error = of_clk_add_provider(np, of_clk_src_onecell_get, &clocks->data);
        if (error)
                return error;

        error = devm_add_action_or_reset(dev,
                                        r9a06g032_clocks_del_clk_provider, np);
        if (error)
                return error;

        return r9a06g032_add_clk_domain(dev);
}

static const struct of_device_id r9a06g032_match[] = {
        { .compatible = "renesas,r9a06g032-sysctrl" },
        { }
};

static struct platform_driver r9a06g032_clock_driver = {
        .driver         = {
                .name   = "renesas,r9a06g032-sysctrl",
                .of_match_table = r9a06g032_match,
        },
};

static int __init r9a06g032_clocks_init(void)
{
        return platform_driver_probe(&r9a06g032_clock_driver,
                        r9a06g032_clocks_probe);
}

subsys_initcall(r9a06g032_clocks_init);