clk: samsung: exynos5433: Add support for runtime PM

Add runtime pm support for all clock controller units (CMU), which belong
to power domains and require special handling during on/off operations.
Typically special values has to be written to MUX registers to change
internal clocks parents to OSC clock before turning power off. During such
operation all clocks, which enter CMU has to be enabled to let MUX to
stabilize. Also for each CMU there is one special parent clock, which has
to be enabled all the time when any access to CMU registers is being done.

This patch solves most of the mysterious external abort and freeze issues
caused by a lack of proper parent CMU clock enabled or incorrect turn off
procedure.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Tested-by: Chanwoo Choi <cw00.choi@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
Link: lkml.kernel.org/r/1503302703-13801-4-git-send-email-m.szyprowski@samsung.com

2 files changed, 330 insertions, 85 deletions

diff --git a/drivers/clk/samsung/clk-exynos5433.c b/drivers/clk/samsung/clk-exynos5433.c
index 11343a597093..cd9337613dd8 100644
--- a/drivers/clk/samsung/clk-exynos5433.c
+++ b/drivers/clk/samsung/clk-exynos5433.c
@@ -9,9 +9,13 @@
  * Common Clock Framework support for Exynos5433 SoC.
  */
 
+#include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 
 #include <dt-bindings/clock/exynos5433.h>
 
@@ -1991,6 +1995,14 @@ static const unsigned long fsys_clk_regs[] __initconst = {
 	ENABLE_IP_FSYS1,
 };
 
+static const struct samsung_clk_reg_dump fsys_suspend_regs[] = {
+	{ MUX_SEL_FSYS0, 0 },
+	{ MUX_SEL_FSYS1, 0 },
+	{ MUX_SEL_FSYS2, 0 },
+	{ MUX_SEL_FSYS3, 0 },
+	{ MUX_SEL_FSYS4, 0 },
+};
+
 static const struct samsung_fixed_rate_clock fsys_fixed_clks[] __initconst = {
 	/* PHY clocks from USBDRD30_PHY */
 	FRATE(CLK_PHYCLK_USBDRD30_UDRD30_PHYCLOCK_PHY,
@@ -2296,16 +2308,11 @@ static const struct samsung_cmu_info fsys_cmu_info __initconst = {
 	.nr_clk_ids		= FSYS_NR_CLK,
 	.clk_regs		= fsys_clk_regs,
 	.nr_clk_regs		= ARRAY_SIZE(fsys_clk_regs),
+	.suspend_regs		= fsys_suspend_regs,
+	.nr_suspend_regs	= ARRAY_SIZE(fsys_suspend_regs),
+	.clk_name		= "aclk_fsys_200",
 };
 
-static void __init exynos5433_cmu_fsys_init(struct device_node *np)
-{
-	samsung_cmu_register_one(np, &fsys_cmu_info);
-}
-
-CLK_OF_DECLARE(exynos5433_cmu_fsys, "samsung,exynos5433-cmu-fsys",
-		exynos5433_cmu_fsys_init);
-
 /*
  * Register offset definitions for CMU_G2D
  */
@@ -2335,6 +2342,10 @@ static const unsigned long g2d_clk_regs[] __initconst = {
 	DIV_ENABLE_IP_G2D_SECURE_SMMU_G2D,
 };
 
+static const struct samsung_clk_reg_dump g2d_suspend_regs[] = {
+	{ MUX_SEL_G2D0, 0 },
+};
+
 /* list of all parent clock list */
 PNAME(mout_aclk_g2d_266_user_p)		= { "oscclk", "aclk_g2d_266", };
 PNAME(mout_aclk_g2d_400_user_p)		= { "oscclk", "aclk_g2d_400", };
@@ -2420,16 +2431,11 @@ static const struct samsung_cmu_info g2d_cmu_info __initconst = {
 	.nr_clk_ids		= G2D_NR_CLK,
 	.clk_regs		= g2d_clk_regs,
 	.nr_clk_regs		= ARRAY_SIZE(g2d_clk_regs),
+	.suspend_regs		= g2d_suspend_regs,
+	.nr_suspend_regs	= ARRAY_SIZE(g2d_suspend_regs),
+	.clk_name		= "aclk_g2d_400",
 };
 
-static void __init exynos5433_cmu_g2d_init(struct device_node *np)
-{
-	samsung_cmu_register_one(np, &g2d_cmu_info);
-}
-
-CLK_OF_DECLARE(exynos5433_cmu_g2d, "samsung,exynos5433-cmu-g2d",
-		exynos5433_cmu_g2d_init);
-
 /*
  * Register offset definitions for CMU_DISP
  */
@@ -2494,6 +2500,18 @@ static const unsigned long disp_clk_regs[] __initconst = {
 	CLKOUT_CMU_DISP_DIV_STAT,
 };
 
+static const struct samsung_clk_reg_dump disp_suspend_regs[] = {
+	/* PLL has to be enabled for suspend */
+	{ DISP_PLL_CON0, 0x85f40502 },
+	/* ignore status of external PHY muxes during suspend to avoid hangs */
+	{ MUX_IGNORE_DISP2, 0x00111111 },
+	{ MUX_SEL_DISP0, 0 },
+	{ MUX_SEL_DISP1, 0 },
+	{ MUX_SEL_DISP2, 0 },
+	{ MUX_SEL_DISP3, 0 },
+	{ MUX_SEL_DISP4, 0 },
+};
+
 /* list of all parent clock list */
 PNAME(mout_disp_pll_p)			= { "oscclk", "fout_disp_pll", };
 PNAME(mout_sclk_dsim1_user_p)		= { "oscclk", "sclk_dsim1_disp", };
@@ -2841,16 +2859,11 @@ static const struct samsung_cmu_info disp_cmu_info __initconst = {
 	.nr_clk_ids		= DISP_NR_CLK,
 	.clk_regs		= disp_clk_regs,
 	.nr_clk_regs		= ARRAY_SIZE(disp_clk_regs),
+	.suspend_regs		= disp_suspend_regs,
+	.nr_suspend_regs	= ARRAY_SIZE(disp_suspend_regs),
+	.clk_name		= "aclk_disp_333",
 };
 
-static void __init exynos5433_cmu_disp_init(struct device_node *np)
-{
-	samsung_cmu_register_one(np, &disp_cmu_info);
-}
-
-CLK_OF_DECLARE(exynos5433_cmu_disp, "samsung,exynos5433-cmu-disp",
-		exynos5433_cmu_disp_init);
-
 /*
  * Register offset definitions for CMU_AUD
  */
@@ -2885,6 +2898,11 @@ static const unsigned long aud_clk_regs[] __initconst = {
 	ENABLE_IP_AUD1,
 };
 
+static const struct samsung_clk_reg_dump aud_suspend_regs[] = {
+	{ MUX_SEL_AUD0, 0 },
+	{ MUX_SEL_AUD1, 0 },
+};
+
 /* list of all parent clock list */
 PNAME(mout_aud_pll_user_aud_p)	= { "oscclk", "fout_aud_pll", };
 PNAME(mout_sclk_aud_pcm_p)	= { "mout_aud_pll_user", "ioclk_audiocdclk0",};
@@ -3011,16 +3029,11 @@ static const struct samsung_cmu_info aud_cmu_info __initconst = {
 	.nr_clk_ids		= AUD_NR_CLK,
 	.clk_regs		= aud_clk_regs,
 	.nr_clk_regs		= ARRAY_SIZE(aud_clk_regs),
+	.suspend_regs		= aud_suspend_regs,
+	.nr_suspend_regs	= ARRAY_SIZE(aud_suspend_regs),
+	.clk_name		= "fout_aud_pll",
 };
 
-static void __init exynos5433_cmu_aud_init(struct device_node *np)
-{
-	samsung_cmu_register_one(np, &aud_cmu_info);
-}
-CLK_OF_DECLARE(exynos5433_cmu_aud, "samsung,exynos5433-cmu-aud",
-		exynos5433_cmu_aud_init);
-
-
 /*
  * Register offset definitions for CMU_BUS{0|1|2}
  */
@@ -3222,6 +3235,10 @@ static const unsigned long g3d_clk_regs[] __initconst = {
 	CLK_STOPCTRL,
 };
 
+static const struct samsung_clk_reg_dump g3d_suspend_regs[] = {
+	{ MUX_SEL_G3D, 0 },
+};
+
 /* list of all parent clock list */
 PNAME(mout_aclk_g3d_400_p)	= { "mout_g3d_pll", "aclk_g3d_400", };
 PNAME(mout_g3d_pll_p)		= { "oscclk", "fout_g3d_pll", };
@@ -3295,15 +3312,11 @@ static const struct samsung_cmu_info g3d_cmu_info __initconst = {
 	.nr_clk_ids		= G3D_NR_CLK,
 	.clk_regs		= g3d_clk_regs,
 	.nr_clk_regs		= ARRAY_SIZE(g3d_clk_regs),
+	.suspend_regs		= g3d_suspend_regs,
+	.nr_suspend_regs	= ARRAY_SIZE(g3d_suspend_regs),
+	.clk_name		= "aclk_g3d_400",
 };
 
-static void __init exynos5433_cmu_g3d_init(struct device_node *np)
-{
-	samsung_cmu_register_one(np, &g3d_cmu_info);
-}
-CLK_OF_DECLARE(exynos5433_cmu_g3d, "samsung,exynos5433-cmu-g3d",
-		exynos5433_cmu_g3d_init);
-
 /*
  * Register offset definitions for CMU_GSCL
  */
@@ -3342,6 +3355,12 @@ static const unsigned long gscl_clk_regs[] __initconst = {
 	ENABLE_IP_GSCL_SECURE_SMMU_GSCL2,
 };
 
+static const struct samsung_clk_reg_dump gscl_suspend_regs[] = {
+	{ MUX_SEL_GSCL, 0 },
+	{ ENABLE_ACLK_GSCL, 0xfff },
+	{ ENABLE_PCLK_GSCL, 0xff },
+};
+
 /* list of all parent clock list */
 PNAME(aclk_gscl_111_user_p)	= { "oscclk", "aclk_gscl_111", };
 PNAME(aclk_gscl_333_user_p)	= { "oscclk", "aclk_gscl_333", };
@@ -3436,15 +3455,11 @@ static const struct samsung_cmu_info gscl_cmu_info __initconst = {
 	.nr_clk_ids		= GSCL_NR_CLK,
 	.clk_regs		= gscl_clk_regs,
 	.nr_clk_regs		= ARRAY_SIZE(gscl_clk_regs),
+	.suspend_regs		= gscl_suspend_regs,
+	.nr_suspend_regs	= ARRAY_SIZE(gscl_suspend_regs),
+	.clk_name		= "aclk_gscl_111",
 };
 
-static void __init exynos5433_cmu_gscl_init(struct device_node *np)
-{
-	samsung_cmu_register_one(np, &gscl_cmu_info);
-}
-CLK_OF_DECLARE(exynos5433_cmu_gscl, "samsung,exynos5433-cmu-gscl",
-		exynos5433_cmu_gscl_init);
-
 /*
  * Register offset definitions for CMU_APOLLO
  */
@@ -3970,6 +3985,11 @@ static const unsigned long mscl_clk_regs[] __initconst = {
 	ENABLE_IP_MSCL_SECURE_SMMU_JPEG,
 };
 
+static const struct samsung_clk_reg_dump mscl_suspend_regs[] = {
+	{ MUX_SEL_MSCL0, 0 },
+	{ MUX_SEL_MSCL1, 0 },
+};
+
 /* list of all parent clock list */
 PNAME(mout_sclk_jpeg_user_p)		= { "oscclk", "sclk_jpeg_mscl", };
 PNAME(mout_aclk_mscl_400_user_p)	= { "oscclk", "aclk_mscl_400", };
@@ -4082,15 +4102,11 @@ static const struct samsung_cmu_info mscl_cmu_info __initconst = {
 	.nr_clk_ids		= MSCL_NR_CLK,
 	.clk_regs		= mscl_clk_regs,
 	.nr_clk_regs		= ARRAY_SIZE(mscl_clk_regs),
+	.suspend_regs		= mscl_suspend_regs,
+	.nr_suspend_regs	= ARRAY_SIZE(mscl_suspend_regs),
+	.clk_name		= "aclk_mscl_400",
 };
 
-static void __init exynos5433_cmu_mscl_init(struct device_node *np)
-{
-	samsung_cmu_register_one(np, &mscl_cmu_info);
-}
-CLK_OF_DECLARE(exynos5433_cmu_mscl, "samsung,exynos5433-cmu-mscl",
-		exynos5433_cmu_mscl_init);
-
 /*
  * Register offset definitions for CMU_MFC
  */
@@ -4120,6 +4136,10 @@ static const unsigned long mfc_clk_regs[] __initconst = {
 	ENABLE_IP_MFC_SECURE_SMMU_MFC,
 };
 
+static const struct samsung_clk_reg_dump mfc_suspend_regs[] = {
+	{ MUX_SEL_MFC, 0 },
+};
+
 PNAME(mout_aclk_mfc_400_user_p)		= { "oscclk", "aclk_mfc_400", };
 
 static const struct samsung_mux_clock mfc_mux_clks[] __initconst = {
@@ -4190,15 +4210,11 @@ static const struct samsung_cmu_info mfc_cmu_info __initconst = {
 	.nr_clk_ids		= MFC_NR_CLK,
 	.clk_regs		= mfc_clk_regs,
 	.nr_clk_regs		= ARRAY_SIZE(mfc_clk_regs),
+	.suspend_regs		= mfc_suspend_regs,
+	.nr_suspend_regs	= ARRAY_SIZE(mfc_suspend_regs),
+	.clk_name		= "aclk_mfc_400",
 };
 
-static void __init exynos5433_cmu_mfc_init(struct device_node *np)
-{
-	samsung_cmu_register_one(np, &mfc_cmu_info);
-}
-CLK_OF_DECLARE(exynos5433_cmu_mfc, "samsung,exynos5433-cmu-mfc",
-		exynos5433_cmu_mfc_init);
-
 /*
  * Register offset definitions for CMU_HEVC
  */
@@ -4228,6 +4244,10 @@ static const unsigned long hevc_clk_regs[] __initconst = {
 	ENABLE_IP_HEVC_SECURE_SMMU_HEVC,
 };
 
+static const struct samsung_clk_reg_dump hevc_suspend_regs[] = {
+	{ MUX_SEL_HEVC, 0 },
+};
+
 PNAME(mout_aclk_hevc_400_user_p)	= { "oscclk", "aclk_hevc_400", };
 
 static const struct samsung_mux_clock hevc_mux_clks[] __initconst = {
@@ -4300,15 +4320,11 @@ static const struct samsung_cmu_info hevc_cmu_info __initconst = {
 	.nr_clk_ids		= HEVC_NR_CLK,
 	.clk_regs		= hevc_clk_regs,
 	.nr_clk_regs		= ARRAY_SIZE(hevc_clk_regs),
+	.suspend_regs		= hevc_suspend_regs,
+	.nr_suspend_regs	= ARRAY_SIZE(hevc_suspend_regs),
+	.clk_name		= "aclk_hevc_400",
 };
 
-static void __init exynos5433_cmu_hevc_init(struct device_node *np)
-{
-	samsung_cmu_register_one(np, &hevc_cmu_info);
-}
-CLK_OF_DECLARE(exynos5433_cmu_hevc, "samsung,exynos5433-cmu-hevc",
-		exynos5433_cmu_hevc_init);
-
 /*
  * Register offset definitions for CMU_ISP
  */
@@ -4342,6 +4358,10 @@ static const unsigned long isp_clk_regs[] __initconst = {
 	ENABLE_IP_ISP3,
 };
 
+static const struct samsung_clk_reg_dump isp_suspend_regs[] = {
+	{ MUX_SEL_ISP, 0 },
+};
+
 PNAME(mout_aclk_isp_dis_400_user_p)	= { "oscclk", "aclk_isp_dis_400", };
 PNAME(mout_aclk_isp_400_user_p)		= { "oscclk", "aclk_isp_400", };
 
@@ -4553,15 +4573,11 @@ static const struct samsung_cmu_info isp_cmu_info __initconst = {
 	.nr_clk_ids		= ISP_NR_CLK,
 	.clk_regs		= isp_clk_regs,
 	.nr_clk_regs		= ARRAY_SIZE(isp_clk_regs),
+	.suspend_regs		= isp_suspend_regs,
+	.nr_suspend_regs	= ARRAY_SIZE(isp_suspend_regs),
+	.clk_name		= "aclk_isp_400",
 };
 
-static void __init exynos5433_cmu_isp_init(struct device_node *np)
-{
-	samsung_cmu_register_one(np, &isp_cmu_info);
-}
-CLK_OF_DECLARE(exynos5433_cmu_isp, "samsung,exynos5433-cmu-isp",
-		exynos5433_cmu_isp_init);
-
 /*
  * Register offset definitions for CMU_CAM0
  */
@@ -4625,6 +4641,15 @@ static const unsigned long cam0_clk_regs[] __initconst = {
 	ENABLE_IP_CAM02,
 	ENABLE_IP_CAM03,
 };
+
+static const struct samsung_clk_reg_dump cam0_suspend_regs[] = {
+	{ MUX_SEL_CAM00, 0 },
+	{ MUX_SEL_CAM01, 0 },
+	{ MUX_SEL_CAM02, 0 },
+	{ MUX_SEL_CAM03, 0 },
+	{ MUX_SEL_CAM04, 0 },
+};
+
 PNAME(mout_aclk_cam0_333_user_p)	= { "oscclk", "aclk_cam0_333", };
 PNAME(mout_aclk_cam0_400_user_p)	= { "oscclk", "aclk_cam0_400", };
 PNAME(mout_aclk_cam0_552_user_p)	= { "oscclk", "aclk_cam0_552", };
@@ -5030,15 +5055,11 @@ static const struct samsung_cmu_info cam0_cmu_info __initconst = {
 	.nr_clk_ids		= CAM0_NR_CLK,
 	.clk_regs		= cam0_clk_regs,
 	.nr_clk_regs		= ARRAY_SIZE(cam0_clk_regs),
+	.suspend_regs		= cam0_suspend_regs,
+	.nr_suspend_regs	= ARRAY_SIZE(cam0_suspend_regs),
+	.clk_name		= "aclk_cam0_400",
 };
 
-static void __init exynos5433_cmu_cam0_init(struct device_node *np)
-{
-	samsung_cmu_register_one(np, &cam0_cmu_info);
-}
-CLK_OF_DECLARE(exynos5433_cmu_cam0, "samsung,exynos5433-cmu-cam0",
-		exynos5433_cmu_cam0_init);
-
 /*
  * Register offset definitions for CMU_CAM1
  */
@@ -5085,6 +5106,12 @@ static const unsigned long cam1_clk_regs[] __initconst = {
 	ENABLE_IP_CAM12,
 };
 
+static const struct samsung_clk_reg_dump cam1_suspend_regs[] = {
+	{ MUX_SEL_CAM10, 0 },
+	{ MUX_SEL_CAM11, 0 },
+	{ MUX_SEL_CAM12, 0 },
+};
+
 PNAME(mout_sclk_isp_uart_user_p)	= { "oscclk", "sclk_isp_uart_cam1", };
 PNAME(mout_sclk_isp_spi1_user_p)	= { "oscclk", "sclk_isp_spi1_cam1", };
 PNAME(mout_sclk_isp_spi0_user_p)	= { "oscclk", "sclk_isp_spi0_cam1", };
@@ -5403,11 +5430,223 @@ static const struct samsung_cmu_info cam1_cmu_info __initconst = {
 	.nr_clk_ids		= CAM1_NR_CLK,
 	.clk_regs		= cam1_clk_regs,
 	.nr_clk_regs		= ARRAY_SIZE(cam1_clk_regs),
+	.suspend_regs		= cam1_suspend_regs,
+	.nr_suspend_regs	= ARRAY_SIZE(cam1_suspend_regs),
+	.clk_name		= "aclk_cam1_400",
+};
+
+
+struct exynos5433_cmu_data {
+	struct samsung_clk_reg_dump *clk_save;
+	unsigned int nr_clk_save;
+	const struct samsung_clk_reg_dump *clk_suspend;
+	unsigned int nr_clk_suspend;
+
+	struct clk *clk;
+	struct clk **pclks;
+	int nr_pclks;
+
+	/* must be the last entry */
+	struct samsung_clk_provider ctx;
+};
+
+static int exynos5433_cmu_suspend(struct device *dev)
+{
+	struct exynos5433_cmu_data *data = dev_get_drvdata(dev);
+	int i;
+
+	samsung_clk_save(data->ctx.reg_base, data->clk_save,
+			 data->nr_clk_save);
+
+	for (i = 0; i < data->nr_pclks; i++)
+		clk_prepare_enable(data->pclks[i]);
+
+	/* for suspend some registers have to be set to certain values */
+	samsung_clk_restore(data->ctx.reg_base, data->clk_suspend,
+			    data->nr_clk_suspend);
+
+	for (i = 0; i < data->nr_pclks; i++)
+		clk_disable_unprepare(data->pclks[i]);
+
+	clk_disable_unprepare(data->clk);
+
+	return 0;
+}
+
+static int exynos5433_cmu_resume(struct device *dev)
+{
+	struct exynos5433_cmu_data *data = dev_get_drvdata(dev);
+	int i;
+
+	clk_prepare_enable(data->clk);
+
+	for (i = 0; i < data->nr_pclks; i++)
+		clk_prepare_enable(data->pclks[i]);
+
+	samsung_clk_restore(data->ctx.reg_base, data->clk_save,
+			    data->nr_clk_save);
+
+	for (i = 0; i < data->nr_pclks; i++)
+		clk_disable_unprepare(data->pclks[i]);
+
+	return 0;
+}
+
+static int __init exynos5433_cmu_probe(struct platform_device *pdev)
+{
+	const struct samsung_cmu_info *info;
+	struct exynos5433_cmu_data *data;
+	struct samsung_clk_provider *ctx;
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	void __iomem *reg_base;
+	int i;
+
+	info = of_device_get_match_data(dev);
+
+	data = devm_kzalloc(dev, sizeof(*data) +
+			    sizeof(*data->ctx.clk_data.hws) * info->nr_clk_ids,
+			    GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+	ctx = &data->ctx;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	reg_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(reg_base)) {
+		dev_err(dev, "failed to map registers\n");
+		return PTR_ERR(reg_base);
+	}
+
+	for (i = 0; i < info->nr_clk_ids; ++i)
+		ctx->clk_data.hws[i] = ERR_PTR(-ENOENT);
+
+	ctx->clk_data.num = info->nr_clk_ids;
+	ctx->reg_base = reg_base;
+	ctx->dev = dev;
+	spin_lock_init(&ctx->lock);
+
+	data->clk_save = samsung_clk_alloc_reg_dump(info->clk_regs,
+						    info->nr_clk_regs);
+	data->nr_clk_save = info->nr_clk_regs;
+	data->clk_suspend = info->suspend_regs;
+	data->nr_clk_suspend = info->nr_suspend_regs;
+	data->nr_pclks = of_count_phandle_with_args(dev->of_node, "clocks",
+						    "#clock-cells");
+	if (data->nr_pclks > 0) {
+		data->pclks = devm_kcalloc(dev, sizeof(struct clk *),
+					   data->nr_pclks, GFP_KERNEL);
+
+		for (i = 0; i < data->nr_pclks; i++) {
+			struct clk *clk = of_clk_get(dev->of_node, i);
+
+			if (IS_ERR(clk))
+				return PTR_ERR(clk);
+			data->pclks[i] = clk;
+		}
+	}
+
+	if (info->clk_name)
+		data->clk = clk_get(dev, info->clk_name);
+	clk_prepare_enable(data->clk);
+
+	platform_set_drvdata(pdev, data);
+
+	/*
+	 * Enable runtime PM here to allow the clock core using runtime PM
+	 * for the registered clocks. Additionally, we increase the runtime
+	 * PM usage count before registering the clocks, to prevent the
+	 * clock core from runtime suspending the device.
+	 */
+	pm_runtime_get_noresume(dev);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
+	if (info->pll_clks)
+		samsung_clk_register_pll(ctx, info->pll_clks, info->nr_pll_clks,
+					 reg_base);
+	if (info->mux_clks)
+		samsung_clk_register_mux(ctx, info->mux_clks,
+					 info->nr_mux_clks);
+	if (info->div_clks)
+		samsung_clk_register_div(ctx, info->div_clks,
+					 info->nr_div_clks);
+	if (info->gate_clks)
+		samsung_clk_register_gate(ctx, info->gate_clks,
+					  info->nr_gate_clks);
+	if (info->fixed_clks)
+		samsung_clk_register_fixed_rate(ctx, info->fixed_clks,
+						info->nr_fixed_clks);
+	if (info->fixed_factor_clks)
+		samsung_clk_register_fixed_factor(ctx, info->fixed_factor_clks,
+						  info->nr_fixed_factor_clks);
+
+	samsung_clk_of_add_provider(dev->of_node, ctx);
+	pm_runtime_put_sync(dev);
+
+	return 0;
+}
+
+static const struct of_device_id exynos5433_cmu_of_match[] = {
+	{
+		.compatible = "samsung,exynos5433-cmu-aud",
+		.data = &aud_cmu_info,
+	}, {
+		.compatible = "samsung,exynos5433-cmu-cam0",
+		.data = &cam0_cmu_info,
+	}, {
+		.compatible = "samsung,exynos5433-cmu-cam1",
+		.data = &cam1_cmu_info,
+	}, {
+		.compatible = "samsung,exynos5433-cmu-disp",
+		.data = &disp_cmu_info,
+	}, {
+		.compatible = "samsung,exynos5433-cmu-g2d",
+		.data = &g2d_cmu_info,
+	}, {
+		.compatible = "samsung,exynos5433-cmu-g3d",
+		.data = &g3d_cmu_info,
+	}, {
+		.compatible = "samsung,exynos5433-cmu-fsys",
+		.data = &fsys_cmu_info,
+	}, {
+		.compatible = "samsung,exynos5433-cmu-gscl",
+		.data = &gscl_cmu_info,
+	}, {
+		.compatible = "samsung,exynos5433-cmu-mfc",
+		.data = &mfc_cmu_info,
+	}, {
+		.compatible = "samsung,exynos5433-cmu-hevc",
+		.data = &hevc_cmu_info,
+	}, {
+		.compatible = "samsung,exynos5433-cmu-isp",
+		.data = &isp_cmu_info,
+	}, {
+		.compatible = "samsung,exynos5433-cmu-mscl",
+		.data = &mscl_cmu_info,
+	}, {
+	},
+};
+
+static const struct dev_pm_ops exynos5433_cmu_pm_ops = {
+	SET_RUNTIME_PM_OPS(exynos5433_cmu_suspend, exynos5433_cmu_resume,
+			   NULL)
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				     pm_runtime_force_resume)
+};
+
+static struct platform_driver exynos5433_cmu_driver __refdata = {
+	.driver	= {
+		.name = "exynos5433-cmu",
+		.of_match_table = exynos5433_cmu_of_match,
+		.suppress_bind_attrs = true,
+		.pm = &exynos5433_cmu_pm_ops,
+	},
+	.probe = exynos5433_cmu_probe,
 };
 
-static void __init exynos5433_cmu_cam1_init(struct device_node *np)
+static int __init exynos5433_cmu_init(void)
 {
-	samsung_cmu_register_one(np, &cam1_cmu_info);
+	return platform_driver_register(&exynos5433_cmu_driver);
 }
-CLK_OF_DECLARE(exynos5433_cmu_cam1, "samsung,exynos5433-cmu-cam1",
-		exynos5433_cmu_cam1_init);
+core_initcall(exynos5433_cmu_init);
diff --git a/drivers/clk/samsung/clk.h b/drivers/clk/samsung/clk.h
index f0acae4f5d1b..d93031e94387 100644
--- a/drivers/clk/samsung/clk.h
+++ b/drivers/clk/samsung/clk.h
@@ -353,6 +353,12 @@ struct samsung_cmu_info {
 	/* list and number of clocks registers */
 	const unsigned long *clk_regs;
 	unsigned int nr_clk_regs;
+
+	/* list and number of clocks registers to set before suspend */
+	const struct samsung_clk_reg_dump *suspend_regs;
+	unsigned int nr_suspend_regs;
+	/* name of the parent clock needed for CMU register access */
+	const char *clk_name;
 };
 
 extern struct samsung_clk_provider *__init samsung_clk_init(