gpio: altera: 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/20250303-gpiochip-set-conversion-v1-8-1d5cceeebf8b@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Author: Bartosz Golaszewski

drivers/gpio/gpio-altera.c

@@ -113,7 +113,7 @@ static int altera_gpio_get(struct gpio_chip *gc, unsigned offset)
 	return !!(readl(altera_gc->regs + ALTERA_GPIO_DATA) & BIT(offset));
 }
 
-static void altera_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
+static int altera_gpio_set(struct gpio_chip *gc, unsigned int offset, int value)
 {
 	struct altera_gpio_chip *altera_gc = gpiochip_get_data(gc);
 	unsigned long flags;
@@ -127,6 +127,8 @@ static void altera_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
 		data_reg &= ~BIT(offset);
 	writel(data_reg, altera_gc->regs + ALTERA_GPIO_DATA);
 	raw_spin_unlock_irqrestore(&altera_gc->gpio_lock, flags);
+
+	return 0;
 }
 
 static int altera_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
@@ -257,7 +259,7 @@ static int altera_gpio_probe(struct platform_device *pdev)
 	altera_gc->gc.direction_input	= altera_gpio_direction_input;
 	altera_gc->gc.direction_output	= altera_gpio_direction_output;
 	altera_gc->gc.get		= altera_gpio_get;
-	altera_gc->gc.set		= altera_gpio_set;
+	altera_gc->gc.set_rv		= altera_gpio_set;
 	altera_gc->gc.owner		= THIS_MODULE;
 	altera_gc->gc.parent		= &pdev->dev;
 	altera_gc->gc.base		= -1;