regulator: max8952: 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.

All users of this regulator use device tree so the transition is
pretty smooth.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/max8952.c

@@ -27,6 +27,7 @@
 #include <linux/regulator/driver.h>
 #include <linux/regulator/max8952.h>
 #include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_gpio.h>
@@ -148,7 +149,6 @@ static struct max8952_platform_data *max8952_parse_dt(struct device *dev)
 
 	pd->gpio_vid0 = of_get_named_gpio(np, "max8952,vid-gpios", 0);
 	pd->gpio_vid1 = of_get_named_gpio(np, "max8952,vid-gpios", 1);
-	pd->gpio_en = of_get_named_gpio(np, "max8952,en-gpio", 0);
 
 	if (of_property_read_u32(np, "max8952,default-mode", &pd->default_mode))
 		dev_warn(dev, "Default mode not specified, assuming 0\n");
@@ -197,6 +197,8 @@ static int max8952_pmic_probe(struct i2c_client *client,
 	struct regulator_config config = { };
 	struct max8952_data *max8952;
 	struct regulator_dev *rdev;
+	struct gpio_desc *gpiod;
+	enum gpiod_flags gflags;
 
 	int ret = 0, err = 0;
 
@@ -224,11 +226,17 @@ static int max8952_pmic_probe(struct i2c_client *client,
 	config.driver_data = max8952;
 	config.of_node = client->dev.of_node;
 
-	config.ena_gpio = pdata->gpio_en;
-	if (client->dev.of_node)
-		config.ena_gpio_initialized = true;
 	if (pdata->reg_data->constraints.boot_on)
-		config.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
+		gflags = GPIOD_OUT_HIGH;
+	else
+		gflags = GPIOD_OUT_LOW;
+	gpiod = devm_gpiod_get_optional(&client->dev,
+					"max8952,en",
+					gflags);
+	if (IS_ERR(gpiod))
+		return PTR_ERR(gpiod);
+	if (gpiod)
+		config.ena_gpiod = gpiod;
 
 	rdev = devm_regulator_register(&client->dev, &regulator, &config);
 	if (IS_ERR(rdev)) {

include/linux/regulator/max8952.h

@@ -120,7 +120,6 @@ enum {
 struct max8952_platform_data {
 	int gpio_vid0;
 	int gpio_vid1;
-	int gpio_en;
 
 	u32 default_mode;
 	u32 dvs_mode[MAX8952_NUM_DVS_MODE]; /* MAX8952_DVS_MODEx_XXXXmV */