pinctrl: at91: 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.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://lore.kernel.org/20250424-gpiochip-set-rv-pinctrl-part2-v1-9-504f91120b99@linaro.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Author: Bartosz Golaszewski

drivers/pinctrl/pinctrl-at91.c

@@ -1449,18 +1449,19 @@ static int at91_gpio_get(struct gpio_chip *chip, unsigned offset)
 	return (pdsr & mask) != 0;
 }
 
-static void at91_gpio_set(struct gpio_chip *chip, unsigned offset,
-				int val)
+static int at91_gpio_set(struct gpio_chip *chip, unsigned int offset, int val)
 {
 	struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
 	void __iomem *pio = at91_gpio->regbase;
 	unsigned mask = 1 << offset;
 
 	writel_relaxed(mask, pio + (val ? PIO_SODR : PIO_CODR));
+
+	return 0;
 }
 
-static void at91_gpio_set_multiple(struct gpio_chip *chip,
-				      unsigned long *mask, unsigned long *bits)
+static int at91_gpio_set_multiple(struct gpio_chip *chip,
+				  unsigned long *mask, unsigned long *bits)
 {
 	struct at91_gpio_chip *at91_gpio = gpiochip_get_data(chip);
 	void __iomem *pio = at91_gpio->regbase;
@@ -1472,6 +1473,8 @@ static void at91_gpio_set_multiple(struct gpio_chip *chip,
 
 	writel_relaxed(set_mask, pio + PIO_SODR);
 	writel_relaxed(clear_mask, pio + PIO_CODR);
+
+	return 0;
 }
 
 static int at91_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
@@ -1798,8 +1801,8 @@ static const struct gpio_chip at91_gpio_template = {
 	.direction_input	= at91_gpio_direction_input,
 	.get			= at91_gpio_get,
 	.direction_output	= at91_gpio_direction_output,
-	.set			= at91_gpio_set,
-	.set_multiple		= at91_gpio_set_multiple,
+	.set_rv			= at91_gpio_set,
+	.set_multiple_rv	= at91_gpio_set_multiple,
 	.dbg_show		= at91_gpio_dbg_show,
 	.can_sleep		= false,
 	.ngpio			= MAX_NB_GPIO_PER_BANK,