pinctrl: rp1: use new GPIO line value setter callbacks

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Andrea della Porta <andrea.porta@suse.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Author: Bartosz Golaszewski

drivers/pinctrl/pinctrl-rp1.c

@@ -779,12 +779,14 @@ static int rp1_gpio_get(struct gpio_chip *chip, unsigned int offset)
 	return ret;
 }
 
-static void rp1_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
+static int rp1_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
 {
 	struct rp1_pin_info *pin = rp1_get_pin(chip, offset);
 
 	if (pin)
 		rp1_set_value(pin, value);
+
+	return 0;
 }
 
 static int rp1_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
@@ -849,7 +851,7 @@ static const struct gpio_chip rp1_gpio_chip = {
 	.direction_output = rp1_gpio_direction_output,
 	.get_direction = rp1_gpio_get_direction,
 	.get = rp1_gpio_get,
-	.set = rp1_gpio_set,
+	.set_rv = rp1_gpio_set,
 	.base = -1,
 	.set_config = rp1_gpio_set_config,
 	.ngpio = RP1_NUM_GPIOS,