Merge branch 'next' of https://source.denx.de/u-boot/custodians/u-boot-pmic into next

drivers/power/regulator/fan53555.c

@@ -101,7 +101,7 @@ struct fan53555_priv {
 
 static int fan53555_regulator_of_to_plat(struct udevice *dev)
 {
-	struct fan53555_plat *dev_pdata = dev_get_plat(dev);
+	struct fan53555_plat *plat = dev_get_plat(dev);
 	struct dm_regulator_uclass_plat *uc_pdata =
 		dev_get_uclass_plat(dev);
 	u32 sleep_vsel;
@@ -118,12 +118,12 @@ static int fan53555_regulator_of_to_plat(struct udevice *dev)
 	 */
 	switch (sleep_vsel) {
 	case FAN53555_VSEL0:
-		dev_pdata->sleep_reg = FAN53555_VSEL0;
-		dev_pdata->vol_reg = FAN53555_VSEL1;
+		plat->sleep_reg = FAN53555_VSEL0;
+		plat->vol_reg = FAN53555_VSEL1;
 		break;
 	case FAN53555_VSEL1:
-		dev_pdata->sleep_reg = FAN53555_VSEL1;
-		dev_pdata->vol_reg = FAN53555_VSEL0;
+		plat->sleep_reg = FAN53555_VSEL1;
+		plat->vol_reg = FAN53555_VSEL0;
 		break;
 	default:
 		pr_err("%s: invalid vsel id %d\n", dev->name, sleep_vsel);

drivers/power/regulator/fixed.c

@@ -24,16 +24,16 @@ struct fixed_clock_regulator_plat {
 static int fixed_regulator_of_to_plat(struct udevice *dev)
 {
 	struct dm_regulator_uclass_plat *uc_pdata;
-	struct regulator_common_plat *dev_pdata;
+	struct regulator_common_plat *plat;
 
-	dev_pdata = dev_get_plat(dev);
+	plat = dev_get_plat(dev);
 	uc_pdata = dev_get_uclass_plat(dev);
 	if (!uc_pdata)
 		return -ENXIO;
 
 	uc_pdata->type = REGULATOR_TYPE_FIXED;
 
-	return regulator_common_of_to_plat(dev, dev_pdata, "gpio");
+	return regulator_common_of_to_plat(dev, plat, "gpio");
 }
 
 static int fixed_regulator_get_value(struct udevice *dev)
@@ -88,7 +88,7 @@ static int fixed_clock_regulator_get_enable(struct udevice *dev)
 static int fixed_clock_regulator_set_enable(struct udevice *dev, bool enable)
 {
 	struct fixed_clock_regulator_plat *priv = dev_get_priv(dev);
-	struct regulator_common_plat *dev_pdata = dev_get_plat(dev);
+	struct regulator_common_plat *plat = dev_get_plat(dev);
 	int ret = 0;
 
 	if (enable) {
@@ -101,11 +101,11 @@ static int fixed_clock_regulator_set_enable(struct udevice *dev, bool enable)
 	if (ret)
 		return ret;
 
-	if (enable && dev_pdata->startup_delay_us)
-		udelay(dev_pdata->startup_delay_us);
+	if (enable && plat->startup_delay_us)
+		udelay(plat->startup_delay_us);
 
-	if (!enable && dev_pdata->off_on_delay_us)
-		udelay(dev_pdata->off_on_delay_us);
+	if (!enable && plat->off_on_delay_us)
+		udelay(plat->off_on_delay_us);
 
 	return ret;
 }

drivers/power/regulator/gpio-regulator.c

@@ -27,12 +27,12 @@ struct gpio_regulator_plat {
 static int gpio_regulator_of_to_plat(struct udevice *dev)
 {
 	struct dm_regulator_uclass_plat *uc_pdata;
-	struct gpio_regulator_plat *dev_pdata;
+	struct gpio_regulator_plat *plat;
 	struct gpio_desc *gpio;
 	int ret, count, i, j;
 	u32 states_array[GPIO_REGULATOR_MAX_STATES * 2];
 
-	dev_pdata = dev_get_plat(dev);
+	plat = dev_get_plat(dev);
 	uc_pdata = dev_get_uclass_plat(dev);
 	if (!uc_pdata)
 		return -ENXIO;
@@ -47,7 +47,7 @@ static int gpio_regulator_of_to_plat(struct udevice *dev)
 	 * per gpio-regulator. As of now no instance with multiple
 	 * gpios is presnt
 	 */
-	gpio = &dev_pdata->gpio;
+	gpio = &plat->gpio;
 	ret = gpio_request_by_name(dev, "gpios", 0, gpio, GPIOD_IS_OUT);
 	if (ret)
 		debug("regulator gpio - not found! Error: %d", ret);
@@ -68,21 +68,21 @@ static int gpio_regulator_of_to_plat(struct udevice *dev)
 		return ret;
 
 	for (i = 0, j = 0; i < count; i += 2) {
-		dev_pdata->voltages[j] = states_array[i];
-		dev_pdata->states[j] = states_array[i + 1];
+		plat->voltages[j] = states_array[i];
+		plat->states[j] = states_array[i + 1];
 		j++;
 	}
 
-	return regulator_common_of_to_plat(dev, &dev_pdata->common, "enable-gpios");
+	return regulator_common_of_to_plat(dev, &plat->common, "enable-gpios");
 }
 
 static int gpio_regulator_get_value(struct udevice *dev)
 {
 	struct dm_regulator_uclass_plat *uc_pdata;
-	struct gpio_regulator_plat *dev_pdata = dev_get_plat(dev);
+	struct gpio_regulator_plat *plat = dev_get_plat(dev);
 	int enable;
 
-	if (!dev_pdata->gpio.dev)
+	if (!plat->gpio.dev)
 		return -ENOSYS;
 
 	uc_pdata = dev_get_uclass_plat(dev);
@@ -91,30 +91,30 @@ static int gpio_regulator_get_value(struct udevice *dev)
 		return -EINVAL;
 	}
 
-	enable = dm_gpio_get_value(&dev_pdata->gpio);
-	if (enable == dev_pdata->states[0])
-		return dev_pdata->voltages[0];
+	enable = dm_gpio_get_value(&plat->gpio);
+	if (enable == plat->states[0])
+		return plat->voltages[0];
 	else
-		return dev_pdata->voltages[1];
+		return plat->voltages[1];
 }
 
 static int gpio_regulator_set_value(struct udevice *dev, int uV)
 {
-	struct gpio_regulator_plat *dev_pdata = dev_get_plat(dev);
+	struct gpio_regulator_plat *plat = dev_get_plat(dev);
 	int ret;
 	bool enable;
 
-	if (!dev_pdata->gpio.dev)
+	if (!plat->gpio.dev)
 		return -ENOSYS;
 
-	if (uV == dev_pdata->voltages[0])
-		enable = dev_pdata->states[0];
-	else if (uV == dev_pdata->voltages[1])
-		enable = dev_pdata->states[1];
+	if (uV == plat->voltages[0])
+		enable = plat->states[0];
+	else if (uV == plat->voltages[1])
+		enable = plat->states[1];
 	else
 		return -EINVAL;
 
-	ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
+	ret = dm_gpio_set_value(&plat->gpio, enable);
 	if (ret) {
 		pr_err("Can't set regulator : %s gpio to: %d\n", dev->name,
 		      enable);
@@ -126,14 +126,14 @@ static int gpio_regulator_set_value(struct udevice *dev, int uV)
 
 static int gpio_regulator_get_enable(struct udevice *dev)
 {
-	struct gpio_regulator_plat *dev_pdata = dev_get_plat(dev);
-	return regulator_common_get_enable(dev, &dev_pdata->common);
+	struct gpio_regulator_plat *plat = dev_get_plat(dev);
+	return regulator_common_get_enable(dev, &plat->common);
 }
 
 static int gpio_regulator_set_enable(struct udevice *dev, bool enable)
 {
-	struct gpio_regulator_plat *dev_pdata = dev_get_plat(dev);
-	return regulator_common_set_enable(dev, &dev_pdata->common, enable);
+	struct gpio_regulator_plat *plat = dev_get_plat(dev);
+	return regulator_common_set_enable(dev, &plat->common, enable);
 }
 
 static const struct dm_regulator_ops gpio_regulator_ops = {

drivers/power/regulator/regulator-uclass.c

@@ -197,6 +197,12 @@ int regulator_set_enable_if_allowed(struct udevice *dev, bool enable)
 	ret = regulator_set_enable(dev, enable);
 	if (ret == -ENOSYS || ret == -EACCES)
 		return 0;
+	/* if we want to disable but it's in use by someone else */
+	if (!enable && ret == -EBUSY)
+		return 0;
+	/* if it's already enabled/disabled */
+	if (ret == -EALREADY)
+		return 0;
 
 	return ret;
 }

drivers/power/regulator/regulator_common.c

@@ -13,7 +13,7 @@
 #include "regulator_common.h"
 
 int regulator_common_of_to_plat(struct udevice *dev,
-				struct regulator_common_plat *dev_pdata,
+				struct regulator_common_plat *plat,
 				const char *enable_gpio_name)
 {
 	struct gpio_desc *gpio;
@@ -26,7 +26,7 @@ int regulator_common_of_to_plat(struct udevice *dev,
 		flags |= GPIOD_IS_OUT_ACTIVE;
 
 	/* Get optional enable GPIO desc */
-	gpio = &dev_pdata->gpio;
+	gpio = &plat->gpio;
 	ret = gpio_request_by_name(dev, enable_gpio_name, 0, gpio, flags);
 	if (ret) {
 		debug("Regulator '%s' optional enable GPIO - not found! Error: %d\n",
@@ -36,12 +36,11 @@ int regulator_common_of_to_plat(struct udevice *dev,
 	}
 
 	/* Get optional ramp up delay */
-	dev_pdata->startup_delay_us = dev_read_u32_default(dev,
-							"startup-delay-us", 0);
-	dev_pdata->off_on_delay_us =
-		dev_read_u32_default(dev, "off-on-delay-us", 0);
-	if (!dev_pdata->off_on_delay_us) {
-		dev_pdata->off_on_delay_us =
+	plat->startup_delay_us = dev_read_u32_default(dev,
+						      "startup-delay-us", 0);
+	plat->off_on_delay_us = dev_read_u32_default(dev, "off-on-delay-us", 0);
+	if (!plat->off_on_delay_us) {
+		plat->off_on_delay_us =
 			dev_read_u32_default(dev, "u-boot,off-on-delay-us", 0);
 	}
 
@@ -49,43 +48,65 @@ int regulator_common_of_to_plat(struct udevice *dev,
 }
 
 int regulator_common_get_enable(const struct udevice *dev,
-	struct regulator_common_plat *dev_pdata)
+	struct regulator_common_plat *plat)
 {
 	/* Enable GPIO is optional */
-	if (!dev_pdata->gpio.dev)
+	if (!plat->gpio.dev)
 		return true;
 
-	return dm_gpio_get_value(&dev_pdata->gpio);
+	return dm_gpio_get_value(&plat->gpio);
 }
 
 int regulator_common_set_enable(const struct udevice *dev,
-	struct regulator_common_plat *dev_pdata, bool enable)
+	struct regulator_common_plat *plat, bool enable)
 {
 	int ret;
 
 	debug("%s: dev='%s', enable=%d, delay=%d, has_gpio=%d\n", __func__,
-	      dev->name, enable, dev_pdata->startup_delay_us,
-	      dm_gpio_is_valid(&dev_pdata->gpio));
+	      dev->name, enable, plat->startup_delay_us,
+	      dm_gpio_is_valid(&plat->gpio));
 	/* Enable GPIO is optional */
-	if (!dm_gpio_is_valid(&dev_pdata->gpio)) {
+	if (!dm_gpio_is_valid(&plat->gpio)) {
 		if (!enable)
 			return -ENOSYS;
 		return 0;
 	}
 
-	ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
+	/* If previously enabled, increase count */
+	if (enable && plat->enable_count > 0) {
+		plat->enable_count++;
+		return -EALREADY;
+	}
+
+	if (!enable) {
+		if (plat->enable_count > 1) {
+			/* If enabled multiple times, decrease count */
+			plat->enable_count--;
+			return -EBUSY;
+		} else if (!plat->enable_count) {
+			/* If already disabled, do nothing */
+			return -EALREADY;
+		}
+	}
+
+	ret = dm_gpio_set_value(&plat->gpio, enable);
 	if (ret) {
 		pr_err("Can't set regulator : %s gpio to: %d\n", dev->name,
 		      enable);
 		return ret;
 	}
 
-	if (enable && dev_pdata->startup_delay_us)
-		udelay(dev_pdata->startup_delay_us);
+	if (enable && plat->startup_delay_us)
+		udelay(plat->startup_delay_us);
 	debug("%s: done\n", __func__);
 
-	if (!enable && dev_pdata->off_on_delay_us)
-		udelay(dev_pdata->off_on_delay_us);
+	if (!enable && plat->off_on_delay_us)
+		udelay(plat->off_on_delay_us);
+
+	if (enable)
+		plat->enable_count++;
+	else
+		plat->enable_count--;
 
 	return 0;
 }

drivers/power/regulator/regulator_common.h

@@ -13,14 +13,35 @@ struct regulator_common_plat {
 	struct gpio_desc gpio; /* GPIO for regulator enable control */
 	unsigned int startup_delay_us;
 	unsigned int off_on_delay_us;
+	unsigned int enable_count;
 };
 
 int regulator_common_of_to_plat(struct udevice *dev,
-				struct regulator_common_plat *dev_pdata, const
+				struct regulator_common_plat *plat, const
 				char *enable_gpio_name);
 int regulator_common_get_enable(const struct udevice *dev,
-	struct regulator_common_plat *dev_pdata);
+	struct regulator_common_plat *plat);
+/*
+ * Enable or Disable a regulator
+ *
+ * This is a reentrant function and subsequent calls that enable will
+ * increase an internal counter, and disable calls will decrease the counter.
+ * The actual resource will be enabled when the counter gets to 1 coming from 0,
+ * and disabled when it reaches 0 coming from 1.
+ *
+ * @dev: regulator device
+ * @plat: Platform data
+ * @enable: bool indicating whether to enable or disable the regulator
+ * @return:
+ * 0 on Success
+ * -EBUSY if the regulator cannot be disabled because it's requested by
+ *        another device
+ * -EALREADY if the regulator has already been enabled or has already been
+ *        disabled
+ * -EACCES if there is no possibility to enable/disable the regulator
+ * -ve on different error situation
+ */
 int regulator_common_set_enable(const struct udevice *dev,
-	struct regulator_common_plat *dev_pdata, bool enable);
+	struct regulator_common_plat *plat, bool enable);
 
 #endif /* _REGULATOR_COMMON_H */