1 files changed, 91 insertions, 4 deletions

diff --git a/drivers/pinctrl/samsung/pinctrl-samsung.c b/drivers/pinctrl/samsung/pinctrl-samsung.c
index ed07e23e0912..623df65a5d6f 100644
--- a/drivers/pinctrl/samsung/pinctrl-samsung.c
+++ b/drivers/pinctrl/samsung/pinctrl-samsung.c
@@ -15,6 +15,7 @@
 // but provides extensions to which platform specific implementation of the gpio
 // and wakeup interrupts can be hooked to.
 
+#include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/gpio/driver.h>
 #include <linux/init.h>
@@ -371,8 +372,8 @@ static void pin_to_reg_bank(struct samsung_pinctrl_drv_data *drvdata,
 }
 
 /* enable or disable a pinmux function */
-static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
-					unsigned group)
+static int samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
+				unsigned group)
 {
 	struct samsung_pinctrl_drv_data *drvdata;
 	const struct samsung_pin_bank_type *type;
@@ -382,6 +383,7 @@ static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
 	unsigned long flags;
 	const struct samsung_pmx_func *func;
 	const struct samsung_pin_group *grp;
+	int ret;
 
 	drvdata = pinctrl_dev_get_drvdata(pctldev);
 	func = &drvdata->pmx_functions[selector];
@@ -397,6 +399,12 @@ static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
 		reg += 4;
 	}
 
+	ret = clk_enable(drvdata->pclk);
+	if (ret) {
+		dev_err(pctldev->dev, "failed to enable clock for setup\n");
+		return ret;
+	}
+
 	raw_spin_lock_irqsave(&bank->slock, flags);
 
 	data = readl(reg + type->reg_offset[PINCFG_TYPE_FUNC]);
@@ -405,6 +413,10 @@ static void samsung_pinmux_setup(struct pinctrl_dev *pctldev, unsigned selector,
 	writel(data, reg + type->reg_offset[PINCFG_TYPE_FUNC]);
 
 	raw_spin_unlock_irqrestore(&bank->slock, flags);
+
+	clk_disable(drvdata->pclk);
+
+	return 0;
 }
 
 /* enable a specified pinmux by writing to registers */
@@ -412,8 +424,7 @@ static int samsung_pinmux_set_mux(struct pinctrl_dev *pctldev,
 				  unsigned selector,
 				  unsigned group)
 {
-	samsung_pinmux_setup(pctldev, selector, group);
-	return 0;
+	return samsung_pinmux_setup(pctldev, selector, group);
 }
 
 /* list of pinmux callbacks for the pinmux vertical in pinctrl core */
@@ -436,6 +447,7 @@ static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
 	u32 data, width, pin_offset, mask, shift;
 	u32 cfg_value, cfg_reg;
 	unsigned long flags;
+	int ret;
 
 	drvdata = pinctrl_dev_get_drvdata(pctldev);
 	pin_to_reg_bank(drvdata, pin, &reg_base, &pin_offset, &bank);
@@ -447,6 +459,12 @@ static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
 	width = type->fld_width[cfg_type];
 	cfg_reg = type->reg_offset[cfg_type];
 
+	ret = clk_enable(drvdata->pclk);
+	if (ret) {
+		dev_err(drvdata->dev, "failed to enable clock\n");
+		return ret;
+	}
+
 	raw_spin_lock_irqsave(&bank->slock, flags);
 
 	mask = (1 << width) - 1;
@@ -466,6 +484,8 @@ static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
 
 	raw_spin_unlock_irqrestore(&bank->slock, flags);
 
+	clk_disable(drvdata->pclk);
+
 	return 0;
 }
 
@@ -555,11 +575,19 @@ static void samsung_gpio_set_value(struct gpio_chip *gc,
 static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
 {
 	struct samsung_pin_bank *bank = gpiochip_get_data(gc);
+	struct samsung_pinctrl_drv_data *drvdata = bank->drvdata;
 	unsigned long flags;
 
+	if (clk_enable(drvdata->pclk)) {
+		dev_err(drvdata->dev, "failed to enable clock\n");
+		return;
+	}
+
 	raw_spin_lock_irqsave(&bank->slock, flags);
 	samsung_gpio_set_value(gc, offset, value);
 	raw_spin_unlock_irqrestore(&bank->slock, flags);
+
+	clk_disable(drvdata->pclk);
 }
 
 /* gpiolib gpio_get callback function */
@@ -569,12 +597,23 @@ static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset)
 	u32 data;
 	struct samsung_pin_bank *bank = gpiochip_get_data(gc);
 	const struct samsung_pin_bank_type *type = bank->type;
+	struct samsung_pinctrl_drv_data *drvdata = bank->drvdata;
+	int ret;
 
 	reg = bank->pctl_base + bank->pctl_offset;
 
+	ret = clk_enable(drvdata->pclk);
+	if (ret) {
+		dev_err(drvdata->dev, "failed to enable clock\n");
+		return ret;
+	}
+
 	data = readl(reg + type->reg_offset[PINCFG_TYPE_DAT]);
 	data >>= offset;
 	data &= 1;
+
+	clk_disable(drvdata->pclk);
+
 	return data;
 }
 
@@ -619,12 +658,22 @@ static int samsung_gpio_set_direction(struct gpio_chip *gc,
 static int samsung_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
 {
 	struct samsung_pin_bank *bank = gpiochip_get_data(gc);
+	struct samsung_pinctrl_drv_data *drvdata = bank->drvdata;
 	unsigned long flags;
 	int ret;
 
+	ret = clk_enable(drvdata->pclk);
+	if (ret) {
+		dev_err(drvdata->dev, "failed to enable clock\n");
+		return ret;
+	}
+
 	raw_spin_lock_irqsave(&bank->slock, flags);
 	ret = samsung_gpio_set_direction(gc, offset, true);
 	raw_spin_unlock_irqrestore(&bank->slock, flags);
+
+	clk_disable(drvdata->pclk);
+
 	return ret;
 }
 
@@ -633,14 +682,23 @@ static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
 							int value)
 {
 	struct samsung_pin_bank *bank = gpiochip_get_data(gc);
+	struct samsung_pinctrl_drv_data *drvdata = bank->drvdata;
 	unsigned long flags;
 	int ret;
 
+	ret = clk_enable(drvdata->pclk);
+	if (ret) {
+		dev_err(drvdata->dev, "failed to enable clock\n");
+		return ret;
+	}
+
 	raw_spin_lock_irqsave(&bank->slock, flags);
 	samsung_gpio_set_value(gc, offset, value);
 	ret = samsung_gpio_set_direction(gc, offset, false);
 	raw_spin_unlock_irqrestore(&bank->slock, flags);
 
+	clk_disable(drvdata->pclk);
+
 	return ret;
 }
 
@@ -1164,6 +1222,12 @@ static int samsung_pinctrl_probe(struct platform_device *pdev)
 		}
 	}
 
+	drvdata->pclk = devm_clk_get_optional_prepared(dev, "pclk");
+	if (IS_ERR(drvdata->pclk)) {
+		ret = PTR_ERR(drvdata->pclk);
+		goto err_put_banks;
+	}
+
 	ret = samsung_pinctrl_register(pdev, drvdata);
 	if (ret)
 		goto err_put_banks;
@@ -1202,6 +1266,13 @@ static int __maybe_unused samsung_pinctrl_suspend(struct device *dev)
 	struct samsung_pinctrl_drv_data *drvdata = dev_get_drvdata(dev);
 	int i;
 
+	i = clk_enable(drvdata->pclk);
+	if (i) {
+		dev_err(drvdata->dev,
+			"failed to enable clock for saving state\n");
+		return i;
+	}
+
 	for (i = 0; i < drvdata->nr_banks; i++) {
 		struct samsung_pin_bank *bank = &drvdata->pin_banks[i];
 		const void __iomem *reg = bank->pctl_base + bank->pctl_offset;
@@ -1231,6 +1302,8 @@ static int __maybe_unused samsung_pinctrl_suspend(struct device *dev)
 		}
 	}
 
+	clk_disable(drvdata->pclk);
+
 	if (drvdata->suspend)
 		drvdata->suspend(drvdata);
 	if (drvdata->retention_ctrl && drvdata->retention_ctrl->enable)
@@ -1250,8 +1323,20 @@ static int __maybe_unused samsung_pinctrl_suspend(struct device *dev)
 static int __maybe_unused samsung_pinctrl_resume(struct device *dev)
 {
 	struct samsung_pinctrl_drv_data *drvdata = dev_get_drvdata(dev);
+	int ret;
 	int i;
 
+	/*
+	 * enable clock before the callback, as we don't want to have to deal
+	 * with callback cleanup on clock failures.
+	 */
+	ret = clk_enable(drvdata->pclk);
+	if (ret) {
+		dev_err(drvdata->dev,
+			"failed to enable clock for restoring state\n");
+		return ret;
+	}
+
 	if (drvdata->resume)
 		drvdata->resume(drvdata);
 
@@ -1286,6 +1371,8 @@ static int __maybe_unused samsung_pinctrl_resume(struct device *dev)
 				writel(bank->pm_save[type], reg + offs[type]);
 	}
 
+	clk_disable(drvdata->pclk);
+
 	if (drvdata->retention_ctrl && drvdata->retention_ctrl->disable)
 		drvdata->retention_ctrl->disable(drvdata);