gpio: crystalcove: use new 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.

Link: https://lore.kernel.org/r/20250310-gpiochip-set-conversion-v1-12-03798bb833eb@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Author: Bartosz Golaszewski

drivers/gpio/gpio-crystalcove.c

@@ -168,18 +168,18 @@ static int crystalcove_gpio_get(struct gpio_chip *chip, unsigned int gpio)
 	return val & 0x1;
 }
 
-static void crystalcove_gpio_set(struct gpio_chip *chip, unsigned int gpio, int value)
+static int crystalcove_gpio_set(struct gpio_chip *chip, unsigned int gpio, int value)
 {
 	struct crystalcove_gpio *cg = gpiochip_get_data(chip);
 	int reg = to_reg(gpio, CTRL_OUT);
 
 	if (reg < 0)
-		return;
+		return 0;
 
 	if (value)
-		regmap_update_bits(cg->regmap, reg, 1, 1);
-	else
-		regmap_update_bits(cg->regmap, reg, 1, 0);
+		return regmap_update_bits(cg->regmap, reg, 1, 1);
+
+	return regmap_update_bits(cg->regmap, reg, 1, 0);
 }
 
 static int crystalcove_irq_type(struct irq_data *data, unsigned int type)
@@ -349,7 +349,7 @@ static int crystalcove_gpio_probe(struct platform_device *pdev)
 	cg->chip.direction_input = crystalcove_gpio_dir_in;
 	cg->chip.direction_output = crystalcove_gpio_dir_out;
 	cg->chip.get = crystalcove_gpio_get;
-	cg->chip.set = crystalcove_gpio_set;
+	cg->chip.set_rv = crystalcove_gpio_set;
 	cg->chip.base = -1;
 	cg->chip.ngpio = CRYSTALCOVE_VGPIO_NUM;
 	cg->chip.can_sleep = true;