// SPDX-License-Identifier: GPL-2.0
/*
 * PLL clock driver for TI Davinci SoCs
 *
 * Copyright (C) 2018 David Lechner <david@lechnology.com>
 *
 * Based on arch/arm/mach-davinci/clock.c
 * Copyright (C) 2006-2007 Texas Instruments.
 * Copyright (C) 2008-2009 Deep Root Systems, LLC
 */

#include <linux/clk-provider.h>
#include <linux/clk.h>
#include <linux/clk/davinci.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/notifier.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of.h>
#include <linux/platform_data/clk-davinci-pll.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/types.h>

#include "pll.h"

#define MAX_NAME_SIZE   20
#define OSCIN_CLK_NAME  "oscin"

#define REVID           0x000
#define PLLCTL          0x100
#define OCSEL           0x104
#define PLLSECCTL       0x108
#define PLLM            0x110
#define PREDIV          0x114
#define PLLDIV1         0x118
#define PLLDIV2         0x11c
#define PLLDIV3         0x120
#define OSCDIV          0x124
#define POSTDIV         0x128
#define BPDIV           0x12c
#define PLLCMD          0x138
#define PLLSTAT         0x13c
#define ALNCTL          0x140
#define DCHANGE         0x144
#define CKEN            0x148
#define CKSTAT          0x14c
#define SYSTAT          0x150
#define PLLDIV4         0x160
#define PLLDIV5         0x164
#define PLLDIV6         0x168
#define PLLDIV7         0x16c
#define PLLDIV8         0x170
#define PLLDIV9         0x174

#define PLLCTL_PLLEN            BIT(0)
#define PLLCTL_PLLPWRDN         BIT(1)
#define PLLCTL_PLLRST           BIT(3)
#define PLLCTL_PLLDIS           BIT(4)
#define PLLCTL_PLLENSRC         BIT(5)
#define PLLCTL_CLKMODE          BIT(8)

/* shared by most *DIV registers */
#define DIV_RATIO_SHIFT         0
#define DIV_RATIO_WIDTH         5
#define DIV_ENABLE_SHIFT        15

#define PLLCMD_GOSET            BIT(0)
#define PLLSTAT_GOSTAT          BIT(0)

#define CKEN_OBSCLK_SHIFT       1
#define CKEN_AUXEN_SHIFT        0

/*
 * OMAP-L138 system reference guide recommends a wait for 4 OSCIN/CLKIN
 * cycles to ensure that the PLLC has switched to bypass mode. Delay of 1us
 * ensures we are good for all > 4MHz OSCIN/CLKIN inputs. Typically the input
 * is ~25MHz. Units are micro seconds.
 */
#define PLL_BYPASS_TIME         1

/* From OMAP-L138 datasheet table 6-4. Units are micro seconds */
#define PLL_RESET_TIME          1

/*
 * From OMAP-L138 datasheet table 6-4; assuming prediv = 1, sqrt(pllm) = 4
 * Units are micro seconds.
 */
#define PLL_LOCK_TIME           20

/**
 * struct davinci_pll_clk - Main PLL clock (aka PLLOUT)
 * @hw: clk_hw for the pll
 * @base: Base memory address
 * @pllm_min: The minimum allowable PLLM[PLLM] value
 * @pllm_max: The maxiumum allowable PLLM[PLLM] value
 * @pllm_mask: Bitmask for PLLM[PLLM] value
 */
struct davinci_pll_clk {
        struct clk_hw hw;
        void __iomem *base;
        u32 pllm_min;
        u32 pllm_max;
        u32 pllm_mask;
};

#define to_davinci_pll_clk(_hw) \
        container_of((_hw), struct davinci_pll_clk, hw)

static unsigned long davinci_pll_recalc_rate(struct clk_hw *hw,
                                             unsigned long parent_rate)
{
        struct davinci_pll_clk *pll = to_davinci_pll_clk(hw);
        unsigned long rate = parent_rate;
        u32 mult;

        mult = readl(pll->base + PLLM) & pll->pllm_mask;
        rate *= mult + 1;

        return rate;
}

static int davinci_pll_determine_rate(struct clk_hw *hw,
                                      struct clk_rate_request *req)
{
        struct davinci_pll_clk *pll = to_davinci_pll_clk(hw);
        struct clk_hw *parent = req->best_parent_hw;
        unsigned long parent_rate = req->best_parent_rate;
        unsigned long rate = req->rate;
        unsigned long best_rate, r;
        u32 mult;

        /* there is a limited range of valid outputs (see datasheet) */
        if (rate < req->min_rate)
                return -EINVAL;

        rate = min(rate, req->max_rate);
        mult = rate / parent_rate;
        best_rate = parent_rate * mult;

        /* easy case when there is no PREDIV */
        if (!(clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT)) {
                if (best_rate < req->min_rate)
                        return -EINVAL;

                if (mult < pll->pllm_min || mult > pll->pllm_max)
                        return -EINVAL;

                req->rate = best_rate;

                return 0;
        }

        /* see if the PREDIV clock can help us */
        best_rate = 0;

        for (mult = pll->pllm_min; mult <= pll->pllm_max; mult++) {
                parent_rate = clk_hw_round_rate(parent, rate / mult);
                r = parent_rate * mult;
                if (r < req->min_rate)
                        continue;
                if (r > rate || r > req->max_rate)
                        break;
                if (r > best_rate) {
                        best_rate = r;
                        req->rate = best_rate;
                        req->best_parent_rate = parent_rate;
                        if (best_rate == rate)
                                break;
                }
        }

        return 0;
}

static int davinci_pll_set_rate(struct clk_hw *hw, unsigned long rate,
                                unsigned long parent_rate)
{
        struct davinci_pll_clk *pll = to_davinci_pll_clk(hw);
        u32 mult;

        mult = rate / parent_rate;
        writel(mult - 1, pll->base + PLLM);

        return 0;
}

#ifdef CONFIG_DEBUG_FS
static void davinci_pll_debug_init(struct clk_hw *hw, struct dentry *dentry);
#else
#define davinci_pll_debug_init NULL
#endif

static const struct clk_ops davinci_pll_ops = {
        .recalc_rate    = davinci_pll_recalc_rate,
        .determine_rate = davinci_pll_determine_rate,
        .set_rate       = davinci_pll_set_rate,
        .debug_init     = davinci_pll_debug_init,
};

/* PLLM works differently on DM365 */
static unsigned long dm365_pll_recalc_rate(struct clk_hw *hw,
                                           unsigned long parent_rate)
{
        struct davinci_pll_clk *pll = to_davinci_pll_clk(hw);
        unsigned long rate = parent_rate;
        u32 mult;

        mult = readl(pll->base + PLLM) & pll->pllm_mask;
        rate *= mult * 2;

        return rate;
}

static const struct clk_ops dm365_pll_ops = {
        .recalc_rate    = dm365_pll_recalc_rate,
        .debug_init     = davinci_pll_debug_init,
};

/**
 * davinci_pll_div_register - common *DIV clock implementation
 * @dev: The PLL platform device or NULL
 * @name: the clock name
 * @parent_name: the parent clock name
 * @reg: the *DIV register
 * @fixed: if true, the divider is a fixed value
 * @flags: bitmap of CLK_* flags from clock-provider.h
 */
static struct clk *davinci_pll_div_register(struct device *dev,
                                            const char *name,
                                            const char *parent_name,
                                            void __iomem *reg,
                                            bool fixed, u32 flags)
{
        const char * const *parent_names = parent_name ? &parent_name : NULL;
        int num_parents = parent_name ? 1 : 0;
        const struct clk_ops *divider_ops = &clk_divider_ops;
        struct clk_gate *gate;
        struct clk_divider *divider;
        struct clk *clk;
        int ret;

        gate = kzalloc(sizeof(*gate), GFP_KERNEL);
        if (!gate)
                return ERR_PTR(-ENOMEM);

        gate->reg = reg;
        gate->bit_idx = DIV_ENABLE_SHIFT;

        divider = kzalloc(sizeof(*divider), GFP_KERNEL);
        if (!divider) {
                ret = -ENOMEM;
                goto err_free_gate;
        }

        divider->reg = reg;
        divider->shift = DIV_RATIO_SHIFT;
        divider->width = DIV_RATIO_WIDTH;

        if (fixed) {
                divider->flags |= CLK_DIVIDER_READ_ONLY;
                divider_ops = &clk_divider_ro_ops;
        }

        clk = clk_register_composite(dev, name, parent_names, num_parents,
                                     NULL, NULL, &divider->hw, divider_ops,
                                     &gate->hw, &clk_gate_ops, flags);
        if (IS_ERR(clk)) {
                ret = PTR_ERR(clk);
                goto err_free_divider;
        }

        return clk;

err_free_divider:
        kfree(divider);
err_free_gate:
        kfree(gate);

        return ERR_PTR(ret);
}

struct davinci_pllen_clk {
        struct clk_hw hw;
        void __iomem *base;
};

#define to_davinci_pllen_clk(_hw) \
        container_of((_hw), struct davinci_pllen_clk, hw)

static const struct clk_ops davinci_pllen_ops = {
        /* this clocks just uses the clock notification feature */
};

/*
 * The PLL has to be switched into bypass mode while we are chaning the rate,
 * so we do that on the PLLEN clock since it is the end of the line. This will
 * switch to bypass before any of the parent clocks (PREDIV, PLL, POSTDIV) are
 * changed and will switch back to the PLL after the changes have been made.
 */
static int davinci_pllen_rate_change(struct notifier_block *nb,
                                     unsigned long flags, void *data)
{
        struct clk_notifier_data *cnd = data;
        struct clk_hw *hw = __clk_get_hw(cnd->clk);
        struct davinci_pllen_clk *pll = to_davinci_pllen_clk(hw);
        u32 ctrl;

        ctrl = readl(pll->base + PLLCTL);

        if (flags == PRE_RATE_CHANGE) {
                /* Switch the PLL to bypass mode */
                ctrl &= ~(PLLCTL_PLLENSRC | PLLCTL_PLLEN);
                writel(ctrl, pll->base + PLLCTL);

                udelay(PLL_BYPASS_TIME);

                /* Reset and enable PLL */
                ctrl &= ~(PLLCTL_PLLRST | PLLCTL_PLLDIS);
                writel(ctrl, pll->base + PLLCTL);
        } else {
                udelay(PLL_RESET_TIME);

                /* Bring PLL out of reset */
                ctrl |= PLLCTL_PLLRST;
                writel(ctrl, pll->base + PLLCTL);

                udelay(PLL_LOCK_TIME);

                /* Remove PLL from bypass mode */
                ctrl |= PLLCTL_PLLEN;
                writel(ctrl, pll->base + PLLCTL);
        }

        return NOTIFY_OK;
}

static struct notifier_block davinci_pllen_notifier = {
        .notifier_call = davinci_pllen_rate_change,
};

/**
 * davinci_pll_clk_register - Register a PLL clock
 * @dev: The PLL platform device or NULL
 * @info: The device-specific clock info
 * @parent_name: The parent clock name
 * @base: The PLL's memory region
 * @cfgchip: CFGCHIP syscon regmap for info->unlock_reg or NULL
 *
 * This creates a series of clocks that represent the PLL.
 *
 *     OSCIN > [PREDIV >] PLL > [POSTDIV >] PLLEN
 *
 * - OSCIN is the parent clock (on secondary PLL, may come from primary PLL)
 * - PREDIV and POSTDIV are optional (depends on the PLL controller)
 * - PLL is the PLL output (aka PLLOUT)
 * - PLLEN is the bypass multiplexer
 *
 * Returns: The PLLOUT clock or a negative error code.
 */
struct clk *davinci_pll_clk_register(struct device *dev,
                                     const struct davinci_pll_clk_info *info,
                                     const char *parent_name,
                                     void __iomem *base,
                                     struct regmap *cfgchip)
{
        char prediv_name[MAX_NAME_SIZE];
        char pllout_name[MAX_NAME_SIZE];
        char postdiv_name[MAX_NAME_SIZE];
        char pllen_name[MAX_NAME_SIZE];
        struct clk_init_data init;
        struct davinci_pll_clk *pllout;
        struct davinci_pllen_clk *pllen;
        struct clk *oscin_clk = NULL;
        struct clk *prediv_clk = NULL;
        struct clk *pllout_clk;
        struct clk *postdiv_clk = NULL;
        struct clk *pllen_clk;
        int ret;

        if (info->flags & PLL_HAS_CLKMODE) {
                /*
                 * If a PLL has PLLCTL[CLKMODE], then it is the primary PLL.
                 * We register a clock named "oscin" that serves as the internal
                 * "input clock" domain shared by both PLLs (if there are 2)
                 * and will be the parent clock to the AUXCLK, SYSCLKBP and
                 * OBSCLK domains. NB: The various TRMs use "OSCIN" to mean
                 * a number of different things. In this driver we use it to
                 * mean the signal after the PLLCTL[CLKMODE] switch.
                 */
                oscin_clk = clk_register_fixed_factor(dev, OSCIN_CLK_NAME,
                                                      parent_name, 0, 1, 1);
                if (IS_ERR(oscin_clk))
                        return oscin_clk;

                parent_name = OSCIN_CLK_NAME;
        }

        if (info->flags & PLL_HAS_PREDIV) {
                bool fixed = info->flags & PLL_PREDIV_FIXED_DIV;
                u32 flags = 0;

                snprintf(prediv_name, MAX_NAME_SIZE, "%s_prediv", info->name);

                if (info->flags & PLL_PREDIV_ALWAYS_ENABLED)
                        flags |= CLK_IS_CRITICAL;

                /* Some? DM355 chips don't correctly report the PREDIV value */
                if (info->flags & PLL_PREDIV_FIXED8)
                        prediv_clk = clk_register_fixed_factor(dev, prediv_name,
                                                        parent_name, flags, 1, 8);
                else
                        prediv_clk = davinci_pll_div_register(dev, prediv_name,
                                parent_name, base + PREDIV, fixed, flags);
                if (IS_ERR(prediv_clk)) {
                        ret = PTR_ERR(prediv_clk);
                        goto err_unregister_oscin;
                }

                parent_name = prediv_name;
        }

        /* Unlock writing to PLL registers */
        if (info->unlock_reg) {
                if (IS_ERR_OR_NULL(cfgchip))
                        dev_warn(dev, "Failed to get CFGCHIP (%ld)\n",
                                 PTR_ERR(cfgchip));
                else
                        regmap_write_bits(cfgchip, info->unlock_reg,
                                          info->unlock_mask, 0);
        }

        pllout = kzalloc(sizeof(*pllout), GFP_KERNEL);
        if (!pllout) {
                ret = -ENOMEM;
                goto err_unregister_prediv;
        }

        snprintf(pllout_name, MAX_NAME_SIZE, "%s_pllout", info->name);

        init.name = pllout_name;
        if (info->flags & PLL_PLLM_2X)
                init.ops = &dm365_pll_ops;
        else
                init.ops = &davinci_pll_ops;
        init.parent_names = &parent_name;
        init.num_parents = 1;
        init.flags = 0;

        if (info->flags & PLL_HAS_PREDIV)
                init.flags |= CLK_SET_RATE_PARENT;

        pllout->hw.init = &init;
        pllout->base = base;
        pllout->pllm_mask = info->pllm_mask;
        pllout->pllm_min = info->pllm_min;
        pllout->pllm_max = info->pllm_max;

        pllout_clk = clk_register(dev, &pllout->hw);
        if (IS_ERR(pllout_clk)) {
                ret = PTR_ERR(pllout_clk);
                goto err_free_pllout;
        }

        clk_hw_set_rate_range(&pllout->hw, info->pllout_min_rate,
                              info->pllout_max_rate);

        parent_name = pllout_name;

        if (info->flags & PLL_HAS_POSTDIV) {
                bool fixed = info->flags & PLL_POSTDIV_FIXED_DIV;
                u32 flags = CLK_SET_RATE_PARENT;

                snprintf(postdiv_name, MAX_NAME_SIZE, "%s_postdiv", info->name);

                if (info->flags & PLL_POSTDIV_ALWAYS_ENABLED)
                        flags |= CLK_IS_CRITICAL;

                postdiv_clk = davinci_pll_div_register(dev, postdiv_name,
                                parent_name, base + POSTDIV, fixed, flags);
                if (IS_ERR(postdiv_clk)) {
                        ret = PTR_ERR(postdiv_clk);
                        goto err_unregister_pllout;
                }

                parent_name = postdiv_name;
        }

        pllen = kzalloc(sizeof(*pllout), GFP_KERNEL);
        if (!pllen) {
                ret = -ENOMEM;
                goto err_unregister_postdiv;
        }

        snprintf(pllen_name, MAX_NAME_SIZE, "%s_pllen", info->name);

        init.name = pllen_name;
        init.ops = &davinci_pllen_ops;
        init.parent_names = &parent_name;
        init.num_parents = 1;
        init.flags = CLK_SET_RATE_PARENT;

        pllen->hw.init = &init;
        pllen->base = base;

        pllen_clk = clk_register(dev, &pllen->hw);
        if (IS_ERR(pllen_clk)) {
                ret = PTR_ERR(pllen_clk);
                goto err_free_pllen;
        }

        clk_notifier_register(pllen_clk, &davinci_pllen_notifier);

        return pllout_clk;

err_free_pllen:
        kfree(pllen);
err_unregister_postdiv:
        clk_unregister(postdiv_clk);
err_unregister_pllout:
        clk_unregister(pllout_clk);
err_free_pllout:
        kfree(pllout);
err_unregister_prediv:
        clk_unregister(prediv_clk);
err_unregister_oscin:
        clk_unregister(oscin_clk);

        return ERR_PTR(ret);
}

/**
 * davinci_pll_auxclk_register - Register bypass clock (AUXCLK)
 * @dev: The PLL platform device or NULL
 * @name: The clock name
 * @base: The PLL memory region
 */
struct clk *davinci_pll_auxclk_register(struct device *dev,
                                        const char *name,
                                        void __iomem *base)
{
        return clk_register_gate(dev, name, OSCIN_CLK_NAME, 0, base + CKEN,
                                 CKEN_AUXEN_SHIFT, 0, NULL);
}

/**
 * davinci_pll_sysclkbp_clk_register - Register bypass divider clock (SYSCLKBP)
 * @dev: The PLL platform device or NULL
 * @name: The clock name
 * @base: The PLL memory region
 */
struct clk *davinci_pll_sysclkbp_clk_register(struct device *dev,
                                              const char *name,
                                              void __iomem *base)
{
        return clk_register_divider(dev, name, OSCIN_CLK_NAME, 0, base + BPDIV,
                                    DIV_RATIO_SHIFT, DIV_RATIO_WIDTH,
                                    CLK_DIVIDER_READ_ONLY, NULL);
}

/**
 * davinci_pll_obsclk_register - Register oscillator divider clock (OBSCLK)
 * @dev: The PLL platform device or NULL
 * @info: The clock info
 * @base: The PLL memory region
 */
struct clk *
davinci_pll_obsclk_register(struct device *dev,
                            const struct davinci_pll_obsclk_info *info,
                            void __iomem *base)
{
        struct clk_mux *mux;
        struct clk_gate *gate;
        struct clk_divider *divider;
        struct clk *clk;
        u32 oscdiv;
        int ret;

        mux = kzalloc(sizeof(*mux), GFP_KERNEL);
        if (!mux)
                return ERR_PTR(-ENOMEM);

        mux->reg = base + OCSEL;
        mux->table = info->table;
        mux->mask = info->ocsrc_mask;

        gate = kzalloc(sizeof(*gate), GFP_KERNEL);
        if (!gate) {
                ret = -ENOMEM;
                goto err_free_mux;
        }

        gate->reg = base + CKEN;
        gate->bit_idx = CKEN_OBSCLK_SHIFT;

        divider = kzalloc(sizeof(*divider), GFP_KERNEL);
        if (!divider) {
                ret = -ENOMEM;
                goto err_free_gate;
        }

        divider->reg = base + OSCDIV;
        divider->shift = DIV_RATIO_SHIFT;
        divider->width = DIV_RATIO_WIDTH;

        /* make sure divider is enabled just in case bootloader disabled it */
        oscdiv = readl(base + OSCDIV);
        oscdiv |= BIT(DIV_ENABLE_SHIFT);
        writel(oscdiv, base + OSCDIV);

        clk = clk_register_composite(dev, info->name, info->parent_names,
                                     info->num_parents,
                                     &mux->hw, &clk_mux_ops,
                                     &divider->hw, &clk_divider_ops,
                                     &gate->hw, &clk_gate_ops, 0);

        if (IS_ERR(clk)) {
                ret = PTR_ERR(clk);
                goto err_free_divider;
        }

        return clk;

err_free_divider:
        kfree(divider);
err_free_gate:
        kfree(gate);
err_free_mux:
        kfree(mux);

        return ERR_PTR(ret);
}

/* The PLL SYSCLKn clocks have a mechanism for synchronizing rate changes. */
static int davinci_pll_sysclk_rate_change(struct notifier_block *nb,
                                          unsigned long flags, void *data)
{
        struct clk_notifier_data *cnd = data;
        struct clk_hw *hw = __clk_get_hw(clk_get_parent(cnd->clk));
        struct davinci_pllen_clk *pll = to_davinci_pllen_clk(hw);
        u32 pllcmd, pllstat;

        switch (flags) {
        case POST_RATE_CHANGE:
                /* apply the changes */
                pllcmd = readl(pll->base + PLLCMD);
                pllcmd |= PLLCMD_GOSET;
                writel(pllcmd, pll->base + PLLCMD);
                /* fallthrough */
        case PRE_RATE_CHANGE:
                /* Wait until for outstanding changes to take effect */
                do {
                        pllstat = readl(pll->base + PLLSTAT);
                } while (pllstat & PLLSTAT_GOSTAT);
                break;
        }

        return NOTIFY_OK;
}

static struct notifier_block davinci_pll_sysclk_notifier = {
        .notifier_call = davinci_pll_sysclk_rate_change,
};

/**
 * davinci_pll_sysclk_register - Register divider clocks (SYSCLKn)
 * @dev: The PLL platform device or NULL
 * @info: The clock info
 * @base: The PLL memory region
 */
struct clk *
davinci_pll_sysclk_register(struct device *dev,
                            const struct davinci_pll_sysclk_info *info,
                            void __iomem *base)
{
        const struct clk_ops *divider_ops = &clk_divider_ops;
        struct clk_gate *gate;
        struct clk_divider *divider;
        struct clk *clk;
        u32 reg;
        u32 flags = 0;
        int ret;

        /* PLLDIVn registers are not entirely consecutive */
        if (info->id < 4)
                reg = PLLDIV1 + 4 * (info->id - 1);
        else
                reg = PLLDIV4 + 4 * (info->id - 4);

        gate = kzalloc(sizeof(*gate), GFP_KERNEL);
        if (!gate)
                return ERR_PTR(-ENOMEM);

        gate->reg = base + reg;
        gate->bit_idx = DIV_ENABLE_SHIFT;

        divider = kzalloc(sizeof(*divider), GFP_KERNEL);
        if (!divider) {
                ret = -ENOMEM;
                goto err_free_gate;
        }

        divider->reg = base + reg;
        divider->shift = DIV_RATIO_SHIFT;
        divider->width = info->ratio_width;
        divider->flags = 0;

        if (info->flags & SYSCLK_FIXED_DIV) {
                divider->flags |= CLK_DIVIDER_READ_ONLY;
                divider_ops = &clk_divider_ro_ops;
        }

        /* Only the ARM clock can change the parent PLL rate */
        if (info->flags & SYSCLK_ARM_RATE)
                flags |= CLK_SET_RATE_PARENT;

        if (info->flags & SYSCLK_ALWAYS_ENABLED)
                flags |= CLK_IS_CRITICAL;

        clk = clk_register_composite(dev, info->name, &info->parent_name, 1,
                                     NULL, NULL, &divider->hw, divider_ops,
                                     &gate->hw, &clk_gate_ops, flags);
        if (IS_ERR(clk)) {
                ret = PTR_ERR(clk);
                goto err_free_divider;
        }

        clk_notifier_register(clk, &davinci_pll_sysclk_notifier);

        return clk;

err_free_divider:
        kfree(divider);
err_free_gate:
        kfree(gate);

        return ERR_PTR(ret);
}

int of_davinci_pll_init(struct device *dev, struct device_node *node,
                        const struct davinci_pll_clk_info *info,
                        const struct davinci_pll_obsclk_info *obsclk_info,
                        const struct davinci_pll_sysclk_info **div_info,
                        u8 max_sysclk_id,
                        void __iomem *base,
                        struct regmap *cfgchip)
{
        struct device_node *child;
        const char *parent_name;
        struct clk *clk;

        if (info->flags & PLL_HAS_CLKMODE)
                parent_name = of_clk_get_parent_name(node, 0);
        else
                parent_name = OSCIN_CLK_NAME;

        clk = davinci_pll_clk_register(dev, info, parent_name, base, cfgchip);
        if (IS_ERR(clk)) {
                dev_err(dev, "failed to register %s\n", info->name);
                return PTR_ERR(clk);
        }

        child = of_get_child_by_name(node, "pllout");
        if (of_device_is_available(child))
                of_clk_add_provider(child, of_clk_src_simple_get, clk);
        of_node_put(child);

        child = of_get_child_by_name(node, "sysclk");
        if (of_device_is_available(child)) {
                struct clk_onecell_data *clk_data;
                struct clk **clks;
                int n_clks =  max_sysclk_id + 1;
                int i;

                clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
                if (!clk_data)
                        return -ENOMEM;

                clks = kmalloc_array(n_clks, sizeof(*clks), GFP_KERNEL);
                if (!clks) {
                        kfree(clk_data);
                        return -ENOMEM;
                }

                clk_data->clks = clks;
                clk_data->clk_num = n_clks;

                for (i = 0; i < n_clks; i++)
                        clks[i] = ERR_PTR(-ENOENT);

                for (; *div_info; div_info++) {
                        clk = davinci_pll_sysclk_register(dev, *div_info, base);
                        if (IS_ERR(clk))
                                dev_warn(dev, "failed to register %s (%ld)\n",
                                         (*div_info)->name, PTR_ERR(clk));
                        else
                                clks[(*div_info)->id] = clk;
                }
                of_clk_add_provider(child, of_clk_src_onecell_get, clk_data);
        }
        of_node_put(child);

        child = of_get_child_by_name(node, "auxclk");
        if (of_device_is_available(child)) {
                char child_name[MAX_NAME_SIZE];

                snprintf(child_name, MAX_NAME_SIZE, "%s_auxclk", info->name);

                clk = davinci_pll_auxclk_register(dev, child_name, base);
                if (IS_ERR(clk))
                        dev_warn(dev, "failed to register %s (%ld)\n",
                                 child_name, PTR_ERR(clk));
                else
                        of_clk_add_provider(child, of_clk_src_simple_get, clk);
        }
        of_node_put(child);

        child = of_get_child_by_name(node, "obsclk");
        if (of_device_is_available(child)) {
                if (obsclk_info)
                        clk = davinci_pll_obsclk_register(dev, obsclk_info, base);
                else
                        clk = ERR_PTR(-EINVAL);

                if (IS_ERR(clk))
                        dev_warn(dev, "failed to register obsclk (%ld)\n",
                                 PTR_ERR(clk));
                else
                        of_clk_add_provider(child, of_clk_src_simple_get, clk);
        }
        of_node_put(child);

        return 0;
}

static struct davinci_pll_platform_data *davinci_pll_get_pdata(struct device *dev)
{
        struct davinci_pll_platform_data *pdata = dev_get_platdata(dev);

        /*
         * Platform data is optional, so allocate a new struct if one was not
         * provided. For device tree, this will always be the case.
         */
        if (!pdata)
                pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
        if (!pdata)
                return NULL;

        /* for device tree, we need to fill in the struct */
        if (dev->of_node)
                pdata->cfgchip =
                        syscon_regmap_lookup_by_compatible("ti,da830-cfgchip");

        return pdata;
}

/* needed in early boot for clocksource/clockevent */
#ifdef CONFIG_ARCH_DAVINCI_DA850
CLK_OF_DECLARE(da850_pll0, "ti,da850-pll0", of_da850_pll0_init);
#endif

static const struct of_device_id davinci_pll_of_match[] = {
#ifdef CONFIG_ARCH_DAVINCI_DA850
        { .compatible = "ti,da850-pll1", .data = of_da850_pll1_init },
#endif
        { }
};

static const struct platform_device_id davinci_pll_id_table[] = {
#ifdef CONFIG_ARCH_DAVINCI_DA830
        { .name = "da830-pll",   .driver_data = (kernel_ulong_t)da830_pll_init   },
#endif
#ifdef CONFIG_ARCH_DAVINCI_DA850
        { .name = "da850-pll0",  .driver_data = (kernel_ulong_t)da850_pll0_init  },
        { .name = "da850-pll1",  .driver_data = (kernel_ulong_t)da850_pll1_init  },
#endif
#ifdef CONFIG_ARCH_DAVINCI_DM355
        { .name = "dm355-pll1",  .driver_data = (kernel_ulong_t)dm355_pll1_init  },
        { .name = "dm355-pll2",  .driver_data = (kernel_ulong_t)dm355_pll2_init  },
#endif
#ifdef CONFIG_ARCH_DAVINCI_DM365
        { .name = "dm365-pll1",  .driver_data = (kernel_ulong_t)dm365_pll1_init  },
        { .name = "dm365-pll2",  .driver_data = (kernel_ulong_t)dm365_pll2_init  },
#endif
#ifdef CONFIG_ARCH_DAVINCI_DM644x
        { .name = "dm644x-pll1", .driver_data = (kernel_ulong_t)dm644x_pll1_init },
        { .name = "dm644x-pll2", .driver_data = (kernel_ulong_t)dm644x_pll2_init },
#endif
#ifdef CONFIG_ARCH_DAVINCI_DM646x
        { .name = "dm646x-pll1", .driver_data = (kernel_ulong_t)dm646x_pll1_init },
        { .name = "dm646x-pll2", .driver_data = (kernel_ulong_t)dm646x_pll2_init },
#endif
        { }
};

typedef int (*davinci_pll_init)(struct device *dev, void __iomem *base,
                                struct regmap *cfgchip);

static int davinci_pll_probe(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct davinci_pll_platform_data *pdata;
        const struct of_device_id *of_id;
        davinci_pll_init pll_init = NULL;
        struct resource *res;
        void __iomem *base;

        of_id = of_match_device(davinci_pll_of_match, dev);
        if (of_id)
                pll_init = of_id->data;
        else if (pdev->id_entry)
                pll_init = (void *)pdev->id_entry->driver_data;

        if (!pll_init) {
                dev_err(dev, "unable to find driver data\n");
                return -EINVAL;
        }

        pdata = davinci_pll_get_pdata(dev);
        if (!pdata) {
                dev_err(dev, "missing platform data\n");
                return -EINVAL;
        }

        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        base = devm_ioremap_resource(dev, res);
        if (IS_ERR(base))
                return PTR_ERR(base);

        return pll_init(dev, base, pdata->cfgchip);
}

static struct platform_driver davinci_pll_driver = {
        .probe          = davinci_pll_probe,
        .driver         = {
                .name           = "davinci-pll-clk",
                .of_match_table = davinci_pll_of_match,
        },
        .id_table       = davinci_pll_id_table,
};

static int __init davinci_pll_driver_init(void)
{
        return platform_driver_register(&davinci_pll_driver);
}

/* has to be postcore_initcall because PSC devices depend on PLL parent clocks */
postcore_initcall(davinci_pll_driver_init);

#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>

#define DEBUG_REG(n)    \
{                       \
        .name   = #n,   \
        .offset = n,    \
}

static const struct debugfs_reg32 davinci_pll_regs[] = {
        DEBUG_REG(REVID),
        DEBUG_REG(PLLCTL),
        DEBUG_REG(OCSEL),
        DEBUG_REG(PLLSECCTL),
        DEBUG_REG(PLLM),
        DEBUG_REG(PREDIV),
        DEBUG_REG(PLLDIV1),
        DEBUG_REG(PLLDIV2),
        DEBUG_REG(PLLDIV3),
        DEBUG_REG(OSCDIV),
        DEBUG_REG(POSTDIV),
        DEBUG_REG(BPDIV),
        DEBUG_REG(PLLCMD),
        DEBUG_REG(PLLSTAT),
        DEBUG_REG(ALNCTL),
        DEBUG_REG(DCHANGE),
        DEBUG_REG(CKEN),
        DEBUG_REG(CKSTAT),
        DEBUG_REG(SYSTAT),
        DEBUG_REG(PLLDIV4),
        DEBUG_REG(PLLDIV5),
        DEBUG_REG(PLLDIV6),
        DEBUG_REG(PLLDIV7),
        DEBUG_REG(PLLDIV8),
        DEBUG_REG(PLLDIV9),
};

static void davinci_pll_debug_init(struct clk_hw *hw, struct dentry *dentry)
{
        struct davinci_pll_clk *pll = to_davinci_pll_clk(hw);
        struct debugfs_regset32 *regset;

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

        regset->regs = davinci_pll_regs;
        regset->nregs = ARRAY_SIZE(davinci_pll_regs);
        regset->base = pll->base;

        debugfs_create_regset32("registers", 0400, dentry, regset);
}
#endif