regulator: s2mps11: Pass descriptor instead of GPIO number

Instead of passing a global GPIO number for the enable GPIO, pass
a descriptor looked up with the standard devm_gpiod_get_optional()
call.

This regulator supports passing platform data, but enable/sleep
regulators are looked up from the device tree exclusively, so
we can need not touch other files.

Tested on Odroid XU3 (with s2mps11 although not using any GPIOs
for regulators, so at least default paths are not broken).

Cc: Sangbeom Kim <sbkim73@samsung.com>
Cc: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Tested-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/s2mps11.c

@@ -5,7 +5,7 @@
 
 #include <linux/bug.h>
 #include <linux/err.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/of.h>
@@ -14,7 +14,6 @@
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
 #include <linux/regulator/of_regulator.h>
-#include <linux/of_gpio.h>
 #include <linux/mfd/samsung/core.h>
 #include <linux/mfd/samsung/s2mps11.h>
 #include <linux/mfd/samsung/s2mps13.h>
@@ -44,7 +43,7 @@ struct s2mps11_info {
 	 * Array (size: number of regulators) with GPIO-s for external
 	 * sleep control.
 	 */
-	int *ext_control_gpio;
+	struct gpio_desc **ext_control_gpiod;
 };
 
 static int get_ramp_delay(int ramp_delay)
@@ -511,7 +510,7 @@ static int s2mps14_regulator_enable(struct regulator_dev *rdev)
 	case S2MPS14X:
 		if (test_bit(rdev_get_id(rdev), s2mps11->suspend_state))
 			val = S2MPS14_ENABLE_SUSPEND;
-		else if (gpio_is_valid(s2mps11->ext_control_gpio[rdev_get_id(rdev)]))
+		else if (s2mps11->ext_control_gpiod[rdev_get_id(rdev)])
 			val = S2MPS14_ENABLE_EXT_CONTROL;
 		else
 			val = rdev->desc->enable_mask;
@@ -805,7 +804,7 @@ static int s2mps14_pmic_enable_ext_control(struct s2mps11_info *s2mps11,
 static void s2mps14_pmic_dt_parse_ext_control_gpio(struct platform_device *pdev,
 		struct of_regulator_match *rdata, struct s2mps11_info *s2mps11)
 {
-	int *gpio = s2mps11->ext_control_gpio;
+	struct gpio_desc **gpio = s2mps11->ext_control_gpiod;
 	unsigned int i;
 	unsigned int valid_regulators[3] = { S2MPS14_LDO10, S2MPS14_LDO11,
 		S2MPS14_LDO12 };
@@ -816,11 +815,20 @@ static void s2mps14_pmic_dt_parse_ext_control_gpio(struct platform_device *pdev,
 		if (!rdata[reg].init_data || !rdata[reg].of_node)
 			continue;
 
-		gpio[reg] = of_get_named_gpio(rdata[reg].of_node,
-				"samsung,ext-control-gpios", 0);
-		if (gpio_is_valid(gpio[reg]))
-			dev_dbg(&pdev->dev, "Using GPIO %d for ext-control over %d/%s\n",
-					gpio[reg], reg, rdata[reg].name);
+		gpio[reg] = devm_gpiod_get_from_of_node(&pdev->dev,
+				rdata[reg].of_node,
+				"samsung,ext-control-gpios",
+				0,
+				GPIOD_OUT_HIGH | GPIOD_FLAGS_BIT_NONEXCLUSIVE,
+				"s2mps11-regulator");
+		if (IS_ERR(gpio[reg])) {
+			dev_err(&pdev->dev, "Failed to get control GPIO for %d/%s\n",
+				reg, rdata[reg].name);
+			continue;
+		}
+		if (gpio[reg])
+			dev_dbg(&pdev->dev, "Using GPIO for ext-control over %d/%s\n",
+				reg, rdata[reg].name);
 	}
 }
 
@@ -1126,17 +1134,11 @@ static int s2mps11_pmic_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	s2mps11->ext_control_gpio = devm_kmalloc_array(&pdev->dev,
-			rdev_num, sizeof(*s2mps11->ext_control_gpio),
+	s2mps11->ext_control_gpiod = devm_kmalloc_array(&pdev->dev,
+			rdev_num, sizeof(*s2mps11->ext_control_gpiod),
 			GFP_KERNEL);
-	if (!s2mps11->ext_control_gpio)
+	if (!s2mps11->ext_control_gpiod)
 		return -ENOMEM;
-	/*
-	 * 0 is a valid GPIO so initialize all GPIO-s to negative value
-	 * to indicate that external control won't be used for this regulator.
-	 */
-	for (i = 0; i < rdev_num; i++)
-		s2mps11->ext_control_gpio[i] = -EINVAL;
 
 	if (!iodev->dev->of_node) {
 		if (iodev->pdata) {
@@ -1166,8 +1168,6 @@ static int s2mps11_pmic_probe(struct platform_device *pdev)
 	config.dev = &pdev->dev;
 	config.regmap = iodev->regmap_pmic;
 	config.driver_data = s2mps11;
-	config.ena_gpio_flags = GPIOF_OUT_INIT_HIGH;
-	config.ena_gpio_initialized = true;
 	for (i = 0; i < rdev_num; i++) {
 		struct regulator_dev *regulator;
 
@@ -1178,7 +1178,7 @@ static int s2mps11_pmic_probe(struct platform_device *pdev)
 			config.init_data = rdata[i].init_data;
 			config.of_node = rdata[i].of_node;
 		}
-		config.ena_gpio = s2mps11->ext_control_gpio[i];
+		config.ena_gpiod = s2mps11->ext_control_gpiod[i];
 
 		regulator = devm_regulator_register(&pdev->dev,
 						&regulators[i], &config);
@@ -1189,7 +1189,7 @@ static int s2mps11_pmic_probe(struct platform_device *pdev)
 			goto out;
 		}
 
-		if (gpio_is_valid(s2mps11->ext_control_gpio[i])) {
+		if (s2mps11->ext_control_gpiod[i]) {
 			ret = s2mps14_pmic_enable_ext_control(s2mps11,
 					regulator);
 			if (ret < 0) {