Merge tag 'samsung-clk-6.4' of https://git.kernel.org/pub/scm/linux/k…

…ernel/git/krzk/linux into clk-samsung

Pull Samsung SoC clk drivers updates from Krzysztof Kozlowski:

 - Exynos850: Add CMU_G3D clock controller for the Mali GPU.  This
   brings new PLLs and few cleanups/simplifications in core Exynos clock
   controller code, so they can be easier re-used in Exynos850 clock
   controller driver.
   New CMU_G3D clock controller needs Devicetree bindings header changes
   with clock indices which are pulled from Samsung SoC repository.

 - Extract Exynos5433 (ARM64) clock controller power management code to
   common driver parts, so later it can be re-used by other Exynos clock
   controller drivers.  This only prepares for such re-usage, which is
   expected to come later for Exynos850.

 - Exynos850: make PMU_ALIVE_PCLK clock critical, because it is needed
   for core block - Power Management Unit.

 - Cleanup: remove() callback returns void.

* tag 'samsung-clk-6.4' of https://git.kernel.org/pub/scm/linux/kernel/git/krzk/linux:
  clk: samsung: exynos850: Make PMU_ALIVE_PCLK critical
  clk: samsung: Convert to platform remove callback returning void
  clk: samsung: exynos5433: Extract PM support to common ARM64 layer
  clk: samsung: Extract parent clock enabling to common function
  clk: samsung: Extract clocks registration to common function
  clk: samsung: exynos850: Add AUD and HSI main gate clocks
  clk: samsung: exynos850: Implement CMU_G3D domain
  clk: samsung: clk-pll: Implement pll0818x PLL type
  clk: samsung: Set dev in samsung_clk_init()
  clk: samsung: Don't pass reg_base to samsung_clk_register_pll()
  clk: samsung: Remove np argument from samsung_clk_init()
  dt-bindings: clock: exynos850: Add AUD and HSI main gate clocks
  dt-bindings: clock: exynos850: Add Exynos850 CMU_G3D

Documentation/devicetree/bindings/clock/samsung,exynos850-clock.yaml

@@ -37,6 +37,7 @@ properties:
       - samsung,exynos850-cmu-cmgp
       - samsung,exynos850-cmu-core
       - samsung,exynos850-cmu-dpu
+      - samsung,exynos850-cmu-g3d
       - samsung,exynos850-cmu-hsi
       - samsung,exynos850-cmu-is
       - samsung,exynos850-cmu-mfcmscl
@@ -169,6 +170,24 @@ allOf:
             - const: oscclk
             - const: dout_dpu
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: samsung,exynos850-cmu-g3d
+
+    then:
+      properties:
+        clocks:
+          items:
+            - description: External reference clock (26 MHz)
+            - description: G3D clock (from CMU_TOP)
+
+        clock-names:
+          items:
+            - const: oscclk
+            - const: dout_g3d_switch
+
   - if:
       properties:
         compatible:

drivers/clk/samsung/clk-exynos-arm64.c

@@ -10,6 +10,9 @@
  */
 #include <linux/clk.h>
 #include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
 
 #include "clk-exynos-arm64.h"
 
@@ -21,6 +24,19 @@
 #define GATE_OFF_START		0x2000
 #define GATE_OFF_END		0x2fff
 
+struct exynos_arm64_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;
+
+	struct samsung_clk_provider *ctx;
+};
+
 /**
  * exynos_arm64_init_clocks - Set clocks initial configuration
  * @np:			CMU device tree node with "reg" property (CMU addr)
@@ -56,6 +72,83 @@ static void __init exynos_arm64_init_clocks(struct device_node *np,
 	iounmap(reg_base);
 }
 
+/**
+ * exynos_arm64_enable_bus_clk - Enable parent clock of specified CMU
+ *
+ * @dev:	Device object; may be NULL if this function is not being
+ *		called from platform driver probe function
+ * @np:		CMU device tree node
+ * @cmu:	CMU data
+ *
+ * Keep CMU parent clock running (needed for CMU registers access).
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+static int __init exynos_arm64_enable_bus_clk(struct device *dev,
+		struct device_node *np, const struct samsung_cmu_info *cmu)
+{
+	struct clk *parent_clk;
+
+	if (!cmu->clk_name)
+		return 0;
+
+	if (dev) {
+		struct exynos_arm64_cmu_data *data;
+
+		parent_clk = clk_get(dev, cmu->clk_name);
+		data = dev_get_drvdata(dev);
+		if (data)
+			data->clk = parent_clk;
+	} else {
+		parent_clk = of_clk_get_by_name(np, cmu->clk_name);
+	}
+
+	if (IS_ERR(parent_clk))
+		return PTR_ERR(parent_clk);
+
+	return clk_prepare_enable(parent_clk);
+}
+
+static int __init exynos_arm64_cmu_prepare_pm(struct device *dev,
+		const struct samsung_cmu_info *cmu)
+{
+	struct exynos_arm64_cmu_data *data = dev_get_drvdata(dev);
+	int i;
+
+	data->clk_save = samsung_clk_alloc_reg_dump(cmu->clk_regs,
+						    cmu->nr_clk_regs);
+	if (!data->clk_save)
+		return -ENOMEM;
+
+	data->nr_clk_save = cmu->nr_clk_regs;
+	data->clk_suspend = cmu->suspend_regs;
+	data->nr_clk_suspend = cmu->nr_suspend_regs;
+	data->nr_pclks = of_clk_get_parent_count(dev->of_node);
+	if (!data->nr_pclks)
+		return 0;
+
+	data->pclks = devm_kcalloc(dev, sizeof(struct clk *), data->nr_pclks,
+				   GFP_KERNEL);
+	if (!data->pclks) {
+		kfree(data->clk_save);
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < data->nr_pclks; i++) {
+		struct clk *clk = of_clk_get(dev->of_node, i);
+
+		if (IS_ERR(clk)) {
+			kfree(data->clk_save);
+			while (--i >= 0)
+				clk_put(data->pclks[i]);
+			return PTR_ERR(clk);
+		}
+		data->pclks[i] = clk;
+	}
+
+	return 0;
+}
+
 /**
  * exynos_arm64_register_cmu - Register specified Exynos CMU domain
  * @dev:	Device object; may be NULL if this function is not being
@@ -72,23 +165,127 @@ static void __init exynos_arm64_init_clocks(struct device_node *np,
 void __init exynos_arm64_register_cmu(struct device *dev,
 		struct device_node *np, const struct samsung_cmu_info *cmu)
 {
-	/* Keep CMU parent clock running (needed for CMU registers access) */
-	if (cmu->clk_name) {
-		struct clk *parent_clk;
-
-		if (dev)
-			parent_clk = clk_get(dev, cmu->clk_name);
-		else
-			parent_clk = of_clk_get_by_name(np, cmu->clk_name);
-
-		if (IS_ERR(parent_clk)) {
-			pr_err("%s: could not find bus clock %s; err = %ld\n",
-			       __func__, cmu->clk_name, PTR_ERR(parent_clk));
-		} else {
-			clk_prepare_enable(parent_clk);
-		}
-	}
+	int err;
+
+	/*
+	 * Try to boot even if the parent clock enablement fails, as it might be
+	 * already enabled by bootloader.
+	 */
+	err = exynos_arm64_enable_bus_clk(dev, np, cmu);
+	if (err)
+		pr_err("%s: could not enable bus clock %s; err = %d\n",
+		       __func__, cmu->clk_name, err);
 
 	exynos_arm64_init_clocks(np, cmu->clk_regs, cmu->nr_clk_regs);
 	samsung_cmu_register_one(np, cmu);
 }
+
+/**
+ * exynos_arm64_register_cmu_pm - Register Exynos CMU domain with PM support
+ *
+ * @pdev:	Platform device object
+ * @set_manual:	If true, set gate clocks to manual mode
+ *
+ * It's a version of exynos_arm64_register_cmu() with PM support. Should be
+ * called from probe function of platform driver.
+ *
+ * Return: 0 on success, or negative error code on error.
+ */
+int __init exynos_arm64_register_cmu_pm(struct platform_device *pdev,
+					bool set_manual)
+{
+	const struct samsung_cmu_info *cmu;
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct exynos_arm64_cmu_data *data;
+	void __iomem *reg_base;
+	int ret;
+
+	cmu = of_device_get_match_data(dev);
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, data);
+
+	ret = exynos_arm64_cmu_prepare_pm(dev, cmu);
+	if (ret)
+		return ret;
+
+	/*
+	 * Try to boot even if the parent clock enablement fails, as it might be
+	 * already enabled by bootloader.
+	 */
+	ret = exynos_arm64_enable_bus_clk(dev, NULL, cmu);
+	if (ret)
+		dev_err(dev, "%s: could not enable bus clock %s; err = %d\n",
+		       __func__, cmu->clk_name, ret);
+
+	if (set_manual)
+		exynos_arm64_init_clocks(np, cmu->clk_regs, cmu->nr_clk_regs);
+
+	reg_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(reg_base))
+		return PTR_ERR(reg_base);
+
+	data->ctx = samsung_clk_init(dev, reg_base, cmu->nr_clk_ids);
+
+	/*
+	 * 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);
+
+	samsung_cmu_register_clocks(data->ctx, cmu);
+	samsung_clk_of_add_provider(dev->of_node, data->ctx);
+	pm_runtime_put_sync(dev);
+
+	return 0;
+}
+
+int exynos_arm64_cmu_suspend(struct device *dev)
+{
+	struct exynos_arm64_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;
+}
+
+int exynos_arm64_cmu_resume(struct device *dev)
+{
+	struct exynos_arm64_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;
+}

drivers/clk/samsung/clk-exynos-arm64.h

@@ -16,5 +16,8 @@
 
 void exynos_arm64_register_cmu(struct device *dev,
 		struct device_node *np, const struct samsung_cmu_info *cmu);
+int exynos_arm64_register_cmu_pm(struct platform_device *pdev, bool set_manual);
+int exynos_arm64_cmu_suspend(struct device *dev);
+int exynos_arm64_cmu_resume(struct device *dev);
 
 #endif /* __CLK_EXYNOS_ARM64_H */

drivers/clk/samsung/clk-exynos-audss.c

@@ -268,7 +268,7 @@ static int exynos_audss_clk_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int exynos_audss_clk_remove(struct platform_device *pdev)
+static void exynos_audss_clk_remove(struct platform_device *pdev)
 {
 	of_clk_del_provider(pdev->dev.of_node);
 
@@ -277,8 +277,6 @@ static int exynos_audss_clk_remove(struct platform_device *pdev)
 
 	if (!IS_ERR(epll))
 		clk_disable_unprepare(epll);
-
-	return 0;
 }
 
 static const struct dev_pm_ops exynos_audss_clk_pm_ops = {
@@ -295,7 +293,7 @@ static struct platform_driver exynos_audss_clk_driver = {
 		.pm = &exynos_audss_clk_pm_ops,
 	},
 	.probe = exynos_audss_clk_probe,
-	.remove = exynos_audss_clk_remove,
+	.remove_new = exynos_audss_clk_remove,
 };
 
 module_platform_driver(exynos_audss_clk_driver);

drivers/clk/samsung/clk-exynos-clkout.c

@@ -196,15 +196,13 @@ static int exynos_clkout_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int exynos_clkout_remove(struct platform_device *pdev)
+static void exynos_clkout_remove(struct platform_device *pdev)
 {
 	struct exynos_clkout *clkout = platform_get_drvdata(pdev);
 
 	of_clk_del_provider(clkout->np);
 	clk_hw_unregister(clkout->data.hws[0]);
 	iounmap(clkout->reg);
-
-	return 0;
 }
 
 static int __maybe_unused exynos_clkout_suspend(struct device *dev)
@@ -235,7 +233,7 @@ static struct platform_driver exynos_clkout_driver = {
 		.pm = &exynos_clkout_pm_ops,
 	},
 	.probe = exynos_clkout_probe,
-	.remove = exynos_clkout_remove,
+	.remove_new = exynos_clkout_remove,
 };
 module_platform_driver(exynos_clkout_driver);
 

drivers/clk/samsung/clk-exynos4.c

@@ -1251,7 +1251,7 @@ static void __init exynos4_clk_init(struct device_node *np,
 	if (!reg_base)
 		panic("%s: failed to map registers\n", __func__);
 
-	ctx = samsung_clk_init(np, reg_base, CLK_NR_CLKS);
+	ctx = samsung_clk_init(NULL, reg_base, CLK_NR_CLKS);
 	hws = ctx->clk_data.hws;
 
 	samsung_clk_of_register_fixed_ext(ctx, exynos4_fixed_rate_ext_clks,
@@ -1276,7 +1276,7 @@ static void __init exynos4_clk_init(struct device_node *np,
 							exynos4210_vpll_rates;
 
 		samsung_clk_register_pll(ctx, exynos4210_plls,
-					ARRAY_SIZE(exynos4210_plls), reg_base);
+					ARRAY_SIZE(exynos4210_plls));
 	} else {
 		if (clk_hw_get_rate(hws[CLK_FIN_PLL]) == 24000000) {
 			exynos4x12_plls[apll].rate_table =
@@ -1288,7 +1288,7 @@ static void __init exynos4_clk_init(struct device_node *np,
 		}
 
 		samsung_clk_register_pll(ctx, exynos4x12_plls,
-					ARRAY_SIZE(exynos4x12_plls), reg_base);
+					ARRAY_SIZE(exynos4x12_plls));
 	}
 
 	samsung_clk_register_fixed_rate(ctx, exynos4_fixed_rate_clks,

drivers/clk/samsung/clk-exynos4412-isp.c

@@ -121,8 +121,7 @@ static int __init exynos4x12_isp_clk_probe(struct platform_device *pdev)
 	if (!exynos4x12_save_isp)
 		return -ENOMEM;
 
-	ctx = samsung_clk_init(np, reg_base, CLK_NR_ISP_CLKS);
-	ctx->dev = dev;
+	ctx = samsung_clk_init(dev, reg_base, CLK_NR_ISP_CLKS);
 
 	platform_set_drvdata(pdev, ctx);