regulator: core: Only support passing enable GPIO descriptors

Now that we changed all providers to pass descriptors into the core
for enable GPIOs instead of a global GPIO number, delete the support
for passing GPIO numbers in, and we get a cleanup and size reduction
in the core, and from a GPIO point of view we use the modern, cleaner
interface.

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/core.c

@@ -23,7 +23,6 @@
 #include <linux/mutex.h>
 #include <linux/suspend.h>
 #include <linux/delay.h>
-#include <linux/gpio.h>
 #include <linux/gpio/consumer.h>
 #include <linux/of.h>
 #include <linux/regmap.h>
@@ -2236,35 +2235,19 @@ static int regulator_ena_gpio_request(struct regulator_dev *rdev,
 {
 	struct regulator_enable_gpio *pin;
 	struct gpio_desc *gpiod;
-	int ret;
 
-	if (config->ena_gpiod)
-		gpiod = config->ena_gpiod;
-	else
-		gpiod = gpio_to_desc(config->ena_gpio);
+	gpiod = config->ena_gpiod;
 
 	list_for_each_entry(pin, &regulator_ena_gpio_list, list) {
 		if (pin->gpiod == gpiod) {
-			rdev_dbg(rdev, "GPIO %d is already used\n",
-				config->ena_gpio);
+			rdev_dbg(rdev, "GPIO is already used\n");
 			goto update_ena_gpio_to_rdev;
 		}
 	}
 
-	if (!config->ena_gpiod) {
-		ret = gpio_request_one(config->ena_gpio,
-				       GPIOF_DIR_OUT | config->ena_gpio_flags,
-				       rdev_get_name(rdev));
-		if (ret)
-			return ret;
-	}
-
 	pin = kzalloc(sizeof(struct regulator_enable_gpio), GFP_KERNEL);
-	if (pin == NULL) {
-		if (!config->ena_gpiod)
-			gpio_free(config->ena_gpio);
+	if (pin == NULL)
 		return -ENOMEM;
-	}
 
 	pin->gpiod = gpiod;
 	list_add(&pin->list, &regulator_ena_gpio_list);
@@ -2287,7 +2270,6 @@ static void regulator_ena_gpio_free(struct regulator_dev *rdev)
 		if (pin->gpiod == rdev->ena_pin->gpiod) {
 			if (pin->request_count <= 1) {
 				pin->request_count = 0;
-				gpiod_put(pin->gpiod);
 				list_del(&pin->list);
 				kfree(pin);
 				rdev->ena_pin = NULL;
@@ -4971,15 +4953,13 @@ regulator_register(const struct regulator_desc *regulator_desc,
 			goto clean;
 	}
 
-	if (config->ena_gpiod ||
-	    ((config->ena_gpio || config->ena_gpio_initialized) &&
-	     gpio_is_valid(config->ena_gpio))) {
+	if (config->ena_gpiod) {
 		mutex_lock(&regulator_list_mutex);
 		ret = regulator_ena_gpio_request(rdev, config);
 		mutex_unlock(&regulator_list_mutex);
 		if (ret != 0) {
-			rdev_err(rdev, "Failed to request enable GPIO%d: %d\n",
-				 config->ena_gpio, ret);
+			rdev_err(rdev, "Failed to request enable GPIO: %d\n",
+				 ret);
 			goto clean;
 		}
 		/* The regulator core took over the GPIO descriptor */

include/linux/regulator/driver.h

@@ -401,13 +401,7 @@ struct regulator_desc {
  *           NULL).
  * @regmap: regmap to use for core regmap helpers if dev_get_regmap() is
  *          insufficient.
- * @ena_gpio_initialized: GPIO controlling regulator enable was properly
- *                        initialized, meaning that >= 0 is a valid gpio
- *                        identifier and < 0 is a non existent gpio.
- * @ena_gpio: GPIO controlling regulator enable.
- * @ena_gpiod: GPIO descriptor controlling regulator enable.
- * @ena_gpio_invert: Sense for GPIO enable control.
- * @ena_gpio_flags: Flags to use when calling gpio_request_one()
+ * @ena_gpiod: GPIO controlling regulator enable.
  */
 struct regulator_config {
 	struct device *dev;
@@ -416,11 +410,7 @@ struct regulator_config {
 	struct device_node *of_node;
 	struct regmap *regmap;
 
-	bool ena_gpio_initialized;
-	int ena_gpio;
 	struct gpio_desc *ena_gpiod;
-	unsigned int ena_gpio_invert:1;
-	unsigned int ena_gpio_flags;
 };
 
 /*