1 files changed, 1128 insertions, 0 deletions

diff --git a/drivers/clk/renesas/renesas-cpg-mssr.c b/drivers/clk/renesas/renesas-cpg-mssr.c
new file mode 100644
index 000000000..a5a68e1e7
--- /dev/null
+++ b/drivers/clk/renesas/renesas-cpg-mssr.c
@@ -0,0 +1,1128 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Renesas Clock Pulse Generator / Module Standby and Software Reset
+ *
+ * Copyright (C) 2015 Glider bvba
+ *
+ * Based on clk-mstp.c, clk-rcar-gen2.c, and clk-rcar-gen3.c
+ *
+ * Copyright (C) 2013 Ideas On Board SPRL
+ * Copyright (C) 2015 Renesas Electronics Corp.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/clk/renesas.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_clock.h>
+#include <linux/pm_domain.h>
+#include <linux/psci.h>
+#include <linux/reset-controller.h>
+#include <linux/slab.h>
+
+#include <dt-bindings/clock/renesas-cpg-mssr.h>
+
+#include "renesas-cpg-mssr.h"
+#include "clk-div6.h"
+
+#ifdef DEBUG
+#define WARN_DEBUG(x)	WARN_ON(x)
+#else
+#define WARN_DEBUG(x)	do { } while (0)
+#endif
+
+
+/*
+ * Module Standby and Software Reset register offets.
+ *
+ * If the registers exist, these are valid for SH-Mobile, R-Mobile,
+ * R-Car Gen2, R-Car Gen3, and RZ/G1.
+ * These are NOT valid for R-Car Gen1 and RZ/A1!
+ */
+
+/*
+ * Module Stop Status Register offsets
+ */
+
+static const u16 mstpsr[] = {
+	0x030, 0x038, 0x040, 0x048, 0x04C, 0x03C, 0x1C0, 0x1C4,
+	0x9A0, 0x9A4, 0x9A8, 0x9AC,
+};
+
+static const u16 mstpsr_for_v3u[] = {
+	0x2E00, 0x2E04, 0x2E08, 0x2E0C, 0x2E10, 0x2E14, 0x2E18, 0x2E1C,
+	0x2E20, 0x2E24, 0x2E28, 0x2E2C, 0x2E30, 0x2E34, 0x2E38,
+};
+
+/*
+ * System Module Stop Control Register offsets
+ */
+
+static const u16 smstpcr[] = {
+	0x130, 0x134, 0x138, 0x13C, 0x140, 0x144, 0x148, 0x14C,
+	0x990, 0x994, 0x998, 0x99C,
+};
+
+static const u16 mstpcr_for_v3u[] = {
+	0x2D00, 0x2D04, 0x2D08, 0x2D0C, 0x2D10, 0x2D14, 0x2D18, 0x2D1C,
+	0x2D20, 0x2D24, 0x2D28, 0x2D2C, 0x2D30, 0x2D34, 0x2D38,
+};
+
+/*
+ * Standby Control Register offsets (RZ/A)
+ * Base address is FRQCR register
+ */
+
+static const u16 stbcr[] = {
+	0xFFFF/*dummy*/, 0x010, 0x014, 0x410, 0x414, 0x418, 0x41C, 0x420,
+	0x424, 0x428, 0x42C,
+};
+
+/*
+ * Software Reset Register offsets
+ */
+
+static const u16 srcr[] = {
+	0x0A0, 0x0A8, 0x0B0, 0x0B8, 0x0BC, 0x0C4, 0x1C8, 0x1CC,
+	0x920, 0x924, 0x928, 0x92C,
+};
+
+static const u16 srcr_for_v3u[] = {
+	0x2C00, 0x2C04, 0x2C08, 0x2C0C, 0x2C10, 0x2C14, 0x2C18, 0x2C1C,
+	0x2C20, 0x2C24, 0x2C28, 0x2C2C, 0x2C30, 0x2C34, 0x2C38,
+};
+
+/* Realtime Module Stop Control Register offsets */
+#define RMSTPCR(i)	(smstpcr[i] - 0x20)
+
+/* Modem Module Stop Control Register offsets (r8a73a4) */
+#define MMSTPCR(i)	(smstpcr[i] + 0x20)
+
+/* Software Reset Clearing Register offsets */
+
+static const u16 srstclr[] = {
+	0x940, 0x944, 0x948, 0x94C, 0x950, 0x954, 0x958, 0x95C,
+	0x960, 0x964, 0x968, 0x96C,
+};
+
+static const u16 srstclr_for_v3u[] = {
+	0x2C80, 0x2C84, 0x2C88, 0x2C8C, 0x2C90, 0x2C94, 0x2C98, 0x2C9C,
+	0x2CA0, 0x2CA4, 0x2CA8, 0x2CAC, 0x2CB0, 0x2CB4, 0x2CB8,
+};
+
+/**
+ * Clock Pulse Generator / Module Standby and Software Reset Private Data
+ *
+ * @rcdev: Optional reset controller entity
+ * @dev: CPG/MSSR device
+ * @base: CPG/MSSR register block base address
+ * @reg_layout: CPG/MSSR register layout
+ * @rmw_lock: protects RMW register accesses
+ * @np: Device node in DT for this CPG/MSSR module
+ * @num_core_clks: Number of Core Clocks in clks[]
+ * @num_mod_clks: Number of Module Clocks in clks[]
+ * @last_dt_core_clk: ID of the last Core Clock exported to DT
+ * @notifiers: Notifier chain to save/restore clock state for system resume
+ * @status_regs: Pointer to status registers array
+ * @control_regs: Pointer to control registers array
+ * @reset_regs: Pointer to reset registers array
+ * @reset_clear_regs:  Pointer to reset clearing registers array
+ * @smstpcr_saved[].mask: Mask of SMSTPCR[] bits under our control
+ * @smstpcr_saved[].val: Saved values of SMSTPCR[]
+ * @clks: Array containing all Core and Module Clocks
+ */
+struct cpg_mssr_priv {
+#ifdef CONFIG_RESET_CONTROLLER
+	struct reset_controller_dev rcdev;
+#endif
+	struct device *dev;
+	void __iomem *base;
+	enum clk_reg_layout reg_layout;
+	spinlock_t rmw_lock;
+	struct device_node *np;
+
+	unsigned int num_core_clks;
+	unsigned int num_mod_clks;
+	unsigned int last_dt_core_clk;
+
+	struct raw_notifier_head notifiers;
+	const u16 *status_regs;
+	const u16 *control_regs;
+	const u16 *reset_regs;
+	const u16 *reset_clear_regs;
+	struct {
+		u32 mask;
+		u32 val;
+	} smstpcr_saved[ARRAY_SIZE(mstpsr_for_v3u)];
+
+	struct clk *clks[];
+};
+
+static struct cpg_mssr_priv *cpg_mssr_priv;
+
+/**
+ * struct mstp_clock - MSTP gating clock
+ * @hw: handle between common and hardware-specific interfaces
+ * @index: MSTP clock number
+ * @priv: CPG/MSSR private data
+ */
+struct mstp_clock {
+	struct clk_hw hw;
+	u32 index;
+	struct cpg_mssr_priv *priv;
+};
+
+#define to_mstp_clock(_hw) container_of(_hw, struct mstp_clock, hw)
+
+static int cpg_mstp_clock_endisable(struct clk_hw *hw, bool enable)
+{
+	struct mstp_clock *clock = to_mstp_clock(hw);
+	struct cpg_mssr_priv *priv = clock->priv;
+	unsigned int reg = clock->index / 32;
+	unsigned int bit = clock->index % 32;
+	struct device *dev = priv->dev;
+	u32 bitmask = BIT(bit);
+	unsigned long flags;
+	unsigned int i;
+	u32 value;
+
+	dev_dbg(dev, "MSTP %u%02u/%pC %s\n", reg, bit, hw->clk,
+		enable ? "ON" : "OFF");
+	spin_lock_irqsave(&priv->rmw_lock, flags);
+
+	if (priv->reg_layout == CLK_REG_LAYOUT_RZ_A) {
+		value = readb(priv->base + priv->control_regs[reg]);
+		if (enable)
+			value &= ~bitmask;
+		else
+			value |= bitmask;
+		writeb(value, priv->base + priv->control_regs[reg]);
+
+		/* dummy read to ensure write has completed */
+		readb(priv->base + priv->control_regs[reg]);
+		barrier_data(priv->base + priv->control_regs[reg]);
+	} else {
+		value = readl(priv->base + priv->control_regs[reg]);
+		if (enable)
+			value &= ~bitmask;
+		else
+			value |= bitmask;
+		writel(value, priv->base + priv->control_regs[reg]);
+	}
+
+	spin_unlock_irqrestore(&priv->rmw_lock, flags);
+
+	if (!enable || priv->reg_layout == CLK_REG_LAYOUT_RZ_A)
+		return 0;
+
+	for (i = 1000; i > 0; --i) {
+		if (!(readl(priv->base + priv->status_regs[reg]) & bitmask))
+			break;
+		cpu_relax();
+	}
+
+	if (!i) {
+		dev_err(dev, "Failed to enable SMSTP %p[%d]\n",
+			priv->base + priv->control_regs[reg], bit);
+		return -ETIMEDOUT;
+	}
+
+	return 0;
+}
+
+static int cpg_mstp_clock_enable(struct clk_hw *hw)
+{
+	return cpg_mstp_clock_endisable(hw, true);
+}
+
+static void cpg_mstp_clock_disable(struct clk_hw *hw)
+{
+	cpg_mstp_clock_endisable(hw, false);
+}
+
+static int cpg_mstp_clock_is_enabled(struct clk_hw *hw)
+{
+	struct mstp_clock *clock = to_mstp_clock(hw);
+	struct cpg_mssr_priv *priv = clock->priv;
+	u32 value;
+
+	if (priv->reg_layout == CLK_REG_LAYOUT_RZ_A)
+		value = readb(priv->base + priv->control_regs[clock->index / 32]);
+	else
+		value = readl(priv->base + priv->status_regs[clock->index / 32]);
+
+	return !(value & BIT(clock->index % 32));
+}
+
+static const struct clk_ops cpg_mstp_clock_ops = {
+	.enable = cpg_mstp_clock_enable,
+	.disable = cpg_mstp_clock_disable,
+	.is_enabled = cpg_mstp_clock_is_enabled,
+};
+
+static
+struct clk *cpg_mssr_clk_src_twocell_get(struct of_phandle_args *clkspec,
+					 void *data)
+{
+	unsigned int clkidx = clkspec->args[1];
+	struct cpg_mssr_priv *priv = data;
+	struct device *dev = priv->dev;
+	unsigned int idx;
+	const char *type;
+	struct clk *clk;
+	int range_check;
+
+	switch (clkspec->args[0]) {
+	case CPG_CORE:
+		type = "core";
+		if (clkidx > priv->last_dt_core_clk) {
+			dev_err(dev, "Invalid %s clock index %u\n", type,
+			       clkidx);
+			return ERR_PTR(-EINVAL);
+		}
+		clk = priv->clks[clkidx];
+		break;
+
+	case CPG_MOD:
+		type = "module";
+		if (priv->reg_layout == CLK_REG_LAYOUT_RZ_A) {
+			idx = MOD_CLK_PACK_10(clkidx);
+			range_check = 7 - (clkidx % 10);
+		} else {
+			idx = MOD_CLK_PACK(clkidx);
+			range_check = 31 - (clkidx % 100);
+		}
+		if (range_check < 0 || idx >= priv->num_mod_clks) {
+			dev_err(dev, "Invalid %s clock index %u\n", type,
+				clkidx);
+			return ERR_PTR(-EINVAL);
+		}
+		clk = priv->clks[priv->num_core_clks + idx];
+		break;
+
+	default:
+		dev_err(dev, "Invalid CPG clock type %u\n", clkspec->args[0]);
+		return ERR_PTR(-EINVAL);
+	}
+
+	if (IS_ERR(clk))
+		dev_err(dev, "Cannot get %s clock %u: %ld", type, clkidx,
+		       PTR_ERR(clk));
+	else
+		dev_dbg(dev, "clock (%u, %u) is %pC at %lu Hz\n",
+			clkspec->args[0], clkspec->args[1], clk,
+			clk_get_rate(clk));
+	return clk;
+}
+
+static void __init cpg_mssr_register_core_clk(const struct cpg_core_clk *core,
+					      const struct cpg_mssr_info *info,
+					      struct cpg_mssr_priv *priv)
+{
+	struct clk *clk = ERR_PTR(-ENOTSUPP), *parent;
+	struct device *dev = priv->dev;
+	unsigned int id = core->id, div = core->div;
+	const char *parent_name;
+
+	WARN_DEBUG(id >= priv->num_core_clks);
+	WARN_DEBUG(PTR_ERR(priv->clks[id]) != -ENOENT);
+
+	if (!core->name) {
+		/* Skip NULLified clock */
+		return;
+	}
+
+	switch (core->type) {
+	case CLK_TYPE_IN:
+		clk = of_clk_get_by_name(priv->np, core->name);
+		break;
+
+	case CLK_TYPE_FF:
+	case CLK_TYPE_DIV6P1:
+	case CLK_TYPE_DIV6_RO:
+		WARN_DEBUG(core->parent >= priv->num_core_clks);
+		parent = priv->clks[core->parent];
+		if (IS_ERR(parent)) {
+			clk = parent;
+			goto fail;
+		}
+
+		parent_name = __clk_get_name(parent);
+
+		if (core->type == CLK_TYPE_DIV6_RO)
+			/* Multiply with the DIV6 register value */
+			div *= (readl(priv->base + core->offset) & 0x3f) + 1;
+
+		if (core->type == CLK_TYPE_DIV6P1) {
+			clk = cpg_div6_register(core->name, 1, &parent_name,
+						priv->base + core->offset,
+						&priv->notifiers);
+		} else {
+			clk = clk_register_fixed_factor(NULL, core->name,
+							parent_name, 0,
+							core->mult, div);
+		}
+		break;
+
+	case CLK_TYPE_FR:
+		clk = clk_register_fixed_rate(NULL, core->name, NULL, 0,
+					      core->mult);
+		break;
+
+	default:
+		if (info->cpg_clk_register)
+			clk = info->cpg_clk_register(dev, core, info,
+						     priv->clks, priv->base,
+						     &priv->notifiers);
+		else
+			dev_err(dev, "%s has unsupported core clock type %u\n",
+				core->name, core->type);
+		break;
+	}
+
+	if (IS_ERR_OR_NULL(clk))
+		goto fail;
+
+	dev_dbg(dev, "Core clock %pC at %lu Hz\n", clk, clk_get_rate(clk));
+	priv->clks[id] = clk;
+	return;
+
+fail:
+	dev_err(dev, "Failed to register %s clock %s: %ld\n", "core",
+		core->name, PTR_ERR(clk));
+}
+
+static void __init cpg_mssr_register_mod_clk(const struct mssr_mod_clk *mod,
+					     const struct cpg_mssr_info *info,
+					     struct cpg_mssr_priv *priv)
+{
+	struct mstp_clock *clock = NULL;
+	struct device *dev = priv->dev;
+	unsigned int id = mod->id;
+	struct clk_init_data init;
+	struct clk *parent, *clk;
+	const char *parent_name;
+	unsigned int i;
+
+	WARN_DEBUG(id < priv->num_core_clks);
+	WARN_DEBUG(id >= priv->num_core_clks + priv->num_mod_clks);
+	WARN_DEBUG(mod->parent >= priv->num_core_clks + priv->num_mod_clks);
+	WARN_DEBUG(PTR_ERR(priv->clks[id]) != -ENOENT);
+
+	if (!mod->name) {
+		/* Skip NULLified clock */
+		return;
+	}
+
+	parent = priv->clks[mod->parent];
+	if (IS_ERR(parent)) {
+		clk = parent;
+		goto fail;
+	}
+
+	clock = kzalloc(sizeof(*clock), GFP_KERNEL);
+	if (!clock) {
+		clk = ERR_PTR(-ENOMEM);
+		goto fail;
+	}
+
+	init.name = mod->name;
+	init.ops = &cpg_mstp_clock_ops;
+	init.flags = CLK_SET_RATE_PARENT;
+	parent_name = __clk_get_name(parent);
+	init.parent_names = &parent_name;
+	init.num_parents = 1;
+
+	clock->index = id - priv->num_core_clks;
+	clock->priv = priv;
+	clock->hw.init = &init;
+
+	for (i = 0; i < info->num_crit_mod_clks; i++)
+		if (id == info->crit_mod_clks[i] &&
+		    cpg_mstp_clock_is_enabled(&clock->hw)) {
+			dev_dbg(dev, "MSTP %s setting CLK_IS_CRITICAL\n",
+				mod->name);
+			init.flags |= CLK_IS_CRITICAL;
+			break;
+		}
+
+	clk = clk_register(NULL, &clock->hw);
+	if (IS_ERR(clk))
+		goto fail;
+
+	dev_dbg(dev, "Module clock %pC at %lu Hz\n", clk, clk_get_rate(clk));
+	priv->clks[id] = clk;
+	priv->smstpcr_saved[clock->index / 32].mask |= BIT(clock->index % 32);
+	return;
+
+fail:
+	dev_err(dev, "Failed to register %s clock %s: %ld\n", "module",
+		mod->name, PTR_ERR(clk));
+	kfree(clock);
+}
+
+struct cpg_mssr_clk_domain {
+	struct generic_pm_domain genpd;
+	unsigned int num_core_pm_clks;
+	unsigned int core_pm_clks[];
+};
+
+static struct cpg_mssr_clk_domain *cpg_mssr_clk_domain;
+
+static bool cpg_mssr_is_pm_clk(const struct of_phandle_args *clkspec,
+			       struct cpg_mssr_clk_domain *pd)
+{
+	unsigned int i;
+
+	if (clkspec->np != pd->genpd.dev.of_node || clkspec->args_count != 2)
+		return false;
+
+	switch (clkspec->args[0]) {
+	case CPG_CORE:
+		for (i = 0; i < pd->num_core_pm_clks; i++)
+			if (clkspec->args[1] == pd->core_pm_clks[i])
+				return true;
+		return false;
+
+	case CPG_MOD:
+		return true;
+
+	default:
+		return false;
+	}
+}
+
+int cpg_mssr_attach_dev(struct generic_pm_domain *unused, struct device *dev)
+{
+	struct cpg_mssr_clk_domain *pd = cpg_mssr_clk_domain;
+	struct device_node *np = dev->of_node;
+	struct of_phandle_args clkspec;
+	struct clk *clk;
+	int i = 0;
+	int error;
+
+	if (!pd) {
+		dev_dbg(dev, "CPG/MSSR clock domain not yet available\n");
+		return -EPROBE_DEFER;
+	}
+
+	while (!of_parse_phandle_with_args(np, "clocks", "#clock-cells", i,
+					   &clkspec)) {
+		if (cpg_mssr_is_pm_clk(&clkspec, pd))
+			goto found;
+
+		of_node_put(clkspec.np);
+		i++;
+	}
+
+	return 0;
+
+found:
+	clk = of_clk_get_from_provider(&clkspec);
+	of_node_put(clkspec.np);
+
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	error = pm_clk_create(dev);
+	if (error)
+		goto fail_put;
+
+	error = pm_clk_add_clk(dev, clk);
+	if (error)
+		goto fail_destroy;
+
+	return 0;
+
+fail_destroy:
+	pm_clk_destroy(dev);
+fail_put:
+	clk_put(clk);
+	return error;
+}
+
+void cpg_mssr_detach_dev(struct generic_pm_domain *unused, struct device *dev)
+{
+	if (!pm_clk_no_clocks(dev))
+		pm_clk_destroy(dev);
+}
+
+static int __init cpg_mssr_add_clk_domain(struct device *dev,
+					  const unsigned int *core_pm_clks,
+					  unsigned int num_core_pm_clks)
+{
+	struct device_node *np = dev->of_node;
+	struct generic_pm_domain *genpd;
+	struct cpg_mssr_clk_domain *pd;
+	size_t pm_size = num_core_pm_clks * sizeof(core_pm_clks[0]);
+
+	pd = devm_kzalloc(dev, sizeof(*pd) + pm_size, GFP_KERNEL);
+	if (!pd)
+		return -ENOMEM;
+
+	pd->num_core_pm_clks = num_core_pm_clks;
+	memcpy(pd->core_pm_clks, core_pm_clks, pm_size);
+
+	genpd = &pd->genpd;
+	genpd->name = np->name;
+	genpd->flags = GENPD_FLAG_PM_CLK | GENPD_FLAG_ALWAYS_ON |
+		       GENPD_FLAG_ACTIVE_WAKEUP;
+	genpd->attach_dev = cpg_mssr_attach_dev;
+	genpd->detach_dev = cpg_mssr_detach_dev;
+	pm_genpd_init(genpd, &pm_domain_always_on_gov, false);
+	cpg_mssr_clk_domain = pd;
+
+	of_genpd_add_provider_simple(np, genpd);
+	return 0;
+}
+
+#ifdef CONFIG_RESET_CONTROLLER
+
+#define rcdev_to_priv(x)	container_of(x, struct cpg_mssr_priv, rcdev)
+
+static int cpg_mssr_reset(struct reset_controller_dev *rcdev,
+			  unsigned long id)
+{
+	struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
+	unsigned int reg = id / 32;
+	unsigned int bit = id % 32;
+	u32 bitmask = BIT(bit);
+
+	dev_dbg(priv->dev, "reset %u%02u\n", reg, bit);
+
+	/* Reset module */
+	writel(bitmask, priv->base + priv->reset_regs[reg]);
+
+	/* Wait for at least one cycle of the RCLK clock (@ ca. 32 kHz) */
+	udelay(35);
+
+	/* Release module from reset state */
+	writel(bitmask, priv->base + priv->reset_clear_regs[reg]);
+
+	return 0;
+}
+
+static int cpg_mssr_assert(struct reset_controller_dev *rcdev, unsigned long id)
+{
+	struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
+	unsigned int reg = id / 32;
+	unsigned int bit = id % 32;
+	u32 bitmask = BIT(bit);
+
+	dev_dbg(priv->dev, "assert %u%02u\n", reg, bit);
+
+	writel(bitmask, priv->base + priv->reset_regs[reg]);
+	return 0;
+}
+
+static int cpg_mssr_deassert(struct reset_controller_dev *rcdev,
+			     unsigned long id)
+{
+	struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
+	unsigned int reg = id / 32;
+	unsigned int bit = id % 32;
+	u32 bitmask = BIT(bit);
+
+	dev_dbg(priv->dev, "deassert %u%02u\n", reg, bit);
+
+	writel(bitmask, priv->base + priv->reset_clear_regs[reg]);
+	return 0;
+}
+
+static int cpg_mssr_status(struct reset_controller_dev *rcdev,
+			   unsigned long id)
+{
+	struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
+	unsigned int reg = id / 32;
+	unsigned int bit = id % 32;
+	u32 bitmask = BIT(bit);
+
+	return !!(readl(priv->base + priv->reset_regs[reg]) & bitmask);
+}
+
+static const struct reset_control_ops cpg_mssr_reset_ops = {
+	.reset = cpg_mssr_reset,
+	.assert = cpg_mssr_assert,
+	.deassert = cpg_mssr_deassert,
+	.status = cpg_mssr_status,
+};
+
+static int cpg_mssr_reset_xlate(struct reset_controller_dev *rcdev,
+				const struct of_phandle_args *reset_spec)
+{
+	struct cpg_mssr_priv *priv = rcdev_to_priv(rcdev);
+	unsigned int unpacked = reset_spec->args[0];
+	unsigned int idx = MOD_CLK_PACK(unpacked);
+
+	if (unpacked % 100 > 31 || idx >= rcdev->nr_resets) {
+		dev_err(priv->dev, "Invalid reset index %u\n", unpacked);
+		return -EINVAL;
+	}
+
+	return idx;
+}
+
+static int cpg_mssr_reset_controller_register(struct cpg_mssr_priv *priv)
+{
+	priv->rcdev.ops = &cpg_mssr_reset_ops;
+	priv->rcdev.of_node = priv->dev->of_node;
+	priv->rcdev.of_reset_n_cells = 1;
+	priv->rcdev.of_xlate = cpg_mssr_reset_xlate;
+	priv->rcdev.nr_resets = priv->num_mod_clks;
+	return devm_reset_controller_register(priv->dev, &priv->rcdev);
+}
+
+#else /* !CONFIG_RESET_CONTROLLER */
+static inline int cpg_mssr_reset_controller_register(struct cpg_mssr_priv *priv)
+{
+	return 0;
+}
+#endif /* !CONFIG_RESET_CONTROLLER */
+
+
+static const struct of_device_id cpg_mssr_match[] = {
+#ifdef CONFIG_CLK_R7S9210
+	{
+		.compatible = "renesas,r7s9210-cpg-mssr",
+		.data = &r7s9210_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A7742
+	{
+		.compatible = "renesas,r8a7742-cpg-mssr",
+		.data = &r8a7742_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A7743
+	{
+		.compatible = "renesas,r8a7743-cpg-mssr",
+		.data = &r8a7743_cpg_mssr_info,
+	},
+	/* RZ/G1N is (almost) identical to RZ/G1M w.r.t. clocks. */
+	{
+		.compatible = "renesas,r8a7744-cpg-mssr",
+		.data = &r8a7743_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A7745
+	{
+		.compatible = "renesas,r8a7745-cpg-mssr",
+		.data = &r8a7745_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A77470
+	{
+		.compatible = "renesas,r8a77470-cpg-mssr",
+		.data = &r8a77470_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A774A1
+	{
+		.compatible = "renesas,r8a774a1-cpg-mssr",
+		.data = &r8a774a1_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A774B1
+	{
+		.compatible = "renesas,r8a774b1-cpg-mssr",
+		.data = &r8a774b1_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A774C0
+	{
+		.compatible = "renesas,r8a774c0-cpg-mssr",
+		.data = &r8a774c0_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A774E1
+	{
+		.compatible = "renesas,r8a774e1-cpg-mssr",
+		.data = &r8a774e1_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A7790
+	{
+		.compatible = "renesas,r8a7790-cpg-mssr",
+		.data = &r8a7790_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A7791
+	{
+		.compatible = "renesas,r8a7791-cpg-mssr",
+		.data = &r8a7791_cpg_mssr_info,
+	},
+	/* R-Car M2-N is (almost) identical to R-Car M2-W w.r.t. clocks. */
+	{
+		.compatible = "renesas,r8a7793-cpg-mssr",
+		.data = &r8a7791_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A7792
+	{
+		.compatible = "renesas,r8a7792-cpg-mssr",
+		.data = &r8a7792_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A7794
+	{
+		.compatible = "renesas,r8a7794-cpg-mssr",
+		.data = &r8a7794_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A7795
+	{
+		.compatible = "renesas,r8a7795-cpg-mssr",
+		.data = &r8a7795_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A77960
+	{
+		.compatible = "renesas,r8a7796-cpg-mssr",
+		.data = &r8a7796_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A77961
+	{
+		.compatible = "renesas,r8a77961-cpg-mssr",
+		.data = &r8a7796_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A77965
+	{
+		.compatible = "renesas,r8a77965-cpg-mssr",
+		.data = &r8a77965_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A77970
+	{
+		.compatible = "renesas,r8a77970-cpg-mssr",
+		.data = &r8a77970_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A77980
+	{
+		.compatible = "renesas,r8a77980-cpg-mssr",
+		.data = &r8a77980_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A77990
+	{
+		.compatible = "renesas,r8a77990-cpg-mssr",
+		.data = &r8a77990_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A77995
+	{
+		.compatible = "renesas,r8a77995-cpg-mssr",
+		.data = &r8a77995_cpg_mssr_info,
+	},
+#endif
+#ifdef CONFIG_CLK_R8A779A0
+	{
+		.compatible = "renesas,r8a779a0-cpg-mssr",
+		.data = &r8a779a0_cpg_mssr_info,
+	},
+#endif
+	{ /* sentinel */ }
+};
+
+static void cpg_mssr_del_clk_provider(void *data)
+{
+	of_clk_del_provider(data);
+}
+
+#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_ARM_PSCI_FW)
+static int cpg_mssr_suspend_noirq(struct device *dev)
+{
+	struct cpg_mssr_priv *priv = dev_get_drvdata(dev);
+	unsigned int reg;
+
+	/* This is the best we can do to check for the presence of PSCI */
+	if (!psci_ops.cpu_suspend)
+		return 0;
+
+	/* Save module registers with bits under our control */
+	for (reg = 0; reg < ARRAY_SIZE(priv->smstpcr_saved); reg++) {
+		if (priv->smstpcr_saved[reg].mask)
+			priv->smstpcr_saved[reg].val =
+				priv->reg_layout == CLK_REG_LAYOUT_RZ_A ?
+				readb(priv->base + priv->control_regs[reg]) :
+				readl(priv->base + priv->control_regs[reg]);
+	}
+
+	/* Save core clocks */
+	raw_notifier_call_chain(&priv->notifiers, PM_EVENT_SUSPEND, NULL);
+
+	return 0;
+}
+
+static int cpg_mssr_resume_noirq(struct device *dev)
+{
+	struct cpg_mssr_priv *priv = dev_get_drvdata(dev);
+	unsigned int reg, i;
+	u32 mask, oldval, newval;
+
+	/* This is the best we can do to check for the presence of PSCI */
+	if (!psci_ops.cpu_suspend)
+		return 0;
+
+	/* Restore core clocks */
+	raw_notifier_call_chain(&priv->notifiers, PM_EVENT_RESUME, NULL);
+
+	/* Restore module clocks */
+	for (reg = 0; reg < ARRAY_SIZE(priv->smstpcr_saved); reg++) {
+		mask = priv->smstpcr_saved[reg].mask;
+		if (!mask)
+			continue;
+
+		if (priv->reg_layout == CLK_REG_LAYOUT_RZ_A)
+			oldval = readb(priv->base + priv->control_regs[reg]);
+		else
+			oldval = readl(priv->base + priv->control_regs[reg]);
+		newval = oldval & ~mask;
+		newval |= priv->smstpcr_saved[reg].val & mask;
+		if (newval == oldval)
+			continue;
+
+		if (priv->reg_layout == CLK_REG_LAYOUT_RZ_A) {
+			writeb(newval, priv->base + priv->control_regs[reg]);
+			/* dummy read to ensure write has completed */
+			readb(priv->base + priv->control_regs[reg]);
+			barrier_data(priv->base + priv->control_regs[reg]);
+			continue;
+		} else
+			writel(newval, priv->base + priv->control_regs[reg]);
+
+		/* Wait until enabled clocks are really enabled */
+		mask &= ~priv->smstpcr_saved[reg].val;
+		if (!mask)
+			continue;
+
+		for (i = 1000; i > 0; --i) {
+			oldval = readl(priv->base + priv->status_regs[reg]);
+			if (!(oldval & mask))
+				break;
+			cpu_relax();
+		}
+
+		if (!i)
+			dev_warn(dev, "Failed to enable SMSTP%u[0x%x]\n", reg,
+				 oldval & mask);
+	}
+
+	return 0;
+}
+
+static const struct dev_pm_ops cpg_mssr_pm = {
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(cpg_mssr_suspend_noirq,
+				      cpg_mssr_resume_noirq)
+};
+#define DEV_PM_OPS	&cpg_mssr_pm
+#else
+#define DEV_PM_OPS	NULL
+#endif /* CONFIG_PM_SLEEP && CONFIG_ARM_PSCI_FW */
+
+static int __init cpg_mssr_common_init(struct device *dev,
+				       struct device_node *np,
+				       const struct cpg_mssr_info *info)
+{
+	struct cpg_mssr_priv *priv;
+	unsigned int nclks, i;
+	int error;
+
+	if (info->init) {
+		error = info->init(dev);
+		if (error)
+			return error;
+	}
+
+	nclks = info->num_total_core_clks + info->num_hw_mod_clks;
+	priv = kzalloc(struct_size(priv, clks, nclks), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->np = np;
+	priv->dev = dev;
+	spin_lock_init(&priv->rmw_lock);
+
+	priv->base = of_iomap(np, 0);
+	if (!priv->base) {
+		error = -ENOMEM;
+		goto out_err;
+	}
+
+	priv->num_core_clks = info->num_total_core_clks;
+	priv->num_mod_clks = info->num_hw_mod_clks;
+	priv->last_dt_core_clk = info->last_dt_core_clk;
+	RAW_INIT_NOTIFIER_HEAD(&priv->notifiers);
+	priv->reg_layout = info->reg_layout;
+	if (priv->reg_layout == CLK_REG_LAYOUT_RCAR_GEN2_AND_GEN3) {
+		priv->status_regs = mstpsr;
+		priv->control_regs = smstpcr;
+		priv->reset_regs = srcr;
+		priv->reset_clear_regs = srstclr;
+	} else if (priv->reg_layout == CLK_REG_LAYOUT_RZ_A) {
+		priv->control_regs = stbcr;
+	} else if (priv->reg_layout == CLK_REG_LAYOUT_RCAR_V3U) {
+		priv->status_regs = mstpsr_for_v3u;
+		priv->control_regs = mstpcr_for_v3u;
+		priv->reset_regs = srcr_for_v3u;
+		priv->reset_clear_regs = srstclr_for_v3u;
+	} else {
+		error = -EINVAL;
+		goto out_err;
+	}
+
+	for (i = 0; i < nclks; i++)
+		priv->clks[i] = ERR_PTR(-ENOENT);
+
+	error = of_clk_add_provider(np, cpg_mssr_clk_src_twocell_get, priv);
+	if (error)
+		goto out_err;
+
+	cpg_mssr_priv = priv;
+
+	return 0;
+
+out_err:
+	if (priv->base)
+		iounmap(priv->base);
+	kfree(priv);
+
+	return error;
+}
+
+void __init cpg_mssr_early_init(struct device_node *np,
+				const struct cpg_mssr_info *info)
+{
+	int error;
+	int i;
+
+	error = cpg_mssr_common_init(NULL, np, info);
+	if (error)
+		return;
+
+	for (i = 0; i < info->num_early_core_clks; i++)
+		cpg_mssr_register_core_clk(&info->early_core_clks[i], info,
+					   cpg_mssr_priv);
+
+	for (i = 0; i < info->num_early_mod_clks; i++)
+		cpg_mssr_register_mod_clk(&info->early_mod_clks[i], info,
+					  cpg_mssr_priv);
+
+}
+
+static int __init cpg_mssr_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	const struct cpg_mssr_info *info;
+	struct cpg_mssr_priv *priv;
+	unsigned int i;
+	int error;
+
+	info = of_device_get_match_data(dev);
+
+	if (!cpg_mssr_priv) {
+		error = cpg_mssr_common_init(dev, dev->of_node, info);
+		if (error)
+			return error;
+	}
+
+	priv = cpg_mssr_priv;
+	priv->dev = dev;
+	dev_set_drvdata(dev, priv);
+
+	for (i = 0; i < info->num_core_clks; i++)
+		cpg_mssr_register_core_clk(&info->core_clks[i], info, priv);
+
+	for (i = 0; i < info->num_mod_clks; i++)
+		cpg_mssr_register_mod_clk(&info->mod_clks[i], info, priv);
+
+	error = devm_add_action_or_reset(dev,
+					 cpg_mssr_del_clk_provider,
+					 np);
+	if (error)
+		return error;
+
+	error = cpg_mssr_add_clk_domain(dev, info->core_pm_clks,
+					info->num_core_pm_clks);
+	if (error)
+		return error;
+
+	/* Reset Controller not supported for Standby Control SoCs */
+	if (priv->reg_layout == CLK_REG_LAYOUT_RZ_A)
+		return 0;
+
+	error = cpg_mssr_reset_controller_register(priv);
+	if (error)
+		return error;
+
+	return 0;
+}
+
+static struct platform_driver cpg_mssr_driver = {
+	.driver		= {
+		.name	= "renesas-cpg-mssr",
+		.of_match_table = cpg_mssr_match,
+		.pm = DEV_PM_OPS,
+	},
+};
+
+static int __init cpg_mssr_init(void)
+{
+	return platform_driver_probe(&cpg_mssr_driver, cpg_mssr_probe);
+}
+
+subsys_initcall(cpg_mssr_init);
+
+void __init cpg_core_nullify_range(struct cpg_core_clk *core_clks,
+				   unsigned int num_core_clks,
+				   unsigned int first_clk,
+				   unsigned int last_clk)
+{
+	unsigned int i;
+
+	for (i = 0; i < num_core_clks; i++)
+		if (core_clks[i].id >= first_clk &&
+		    core_clks[i].id <= last_clk)
+			core_clks[i].name = NULL;
+}
+
+void __init mssr_mod_nullify(struct mssr_mod_clk *mod_clks,
+			     unsigned int num_mod_clks,
+			     const unsigned int *clks, unsigned int n)
+{
+	unsigned int i, j;
+
+	for (i = 0, j = 0; i < num_mod_clks && j < n; i++)
+		if (mod_clks[i].id == clks[j]) {
+			mod_clks[i].name = NULL;
+			j++;
+		}
+}
+
+void __init mssr_mod_reparent(struct mssr_mod_clk *mod_clks,
+			      unsigned int num_mod_clks,
+			      const struct mssr_mod_reparent *clks,
+			      unsigned int n)
+{
+	unsigned int i, j;
+
+	for (i = 0, j = 0; i < num_mod_clks && j < n; i++)
+		if (mod_clks[i].id == clks[j].clk) {
+			mod_clks[i].parent = clks[j].parent;
+			j++;
+		}
+}
+
+MODULE_DESCRIPTION("Renesas CPG/MSSR Driver");
+MODULE_LICENSE("GPL v2");