powerpc: 44x/gpio: 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.

Reviewed-by: Linus Walleij <[email protected]>
Reviewed-by: Christophe Leroy <[email protected]>
Signed-off-by: Bartosz Golaszewski <[email protected]>
Signed-off-by: Madhavan Srinivasan <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: Bartosz Golaszewski

arch/powerpc/platforms/44x/gpio.c

@@ -75,8 +75,7 @@ __ppc4xx_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 		clrbits32(&regs->or, GPIO_MASK(gpio));
 }
 
-static void
-ppc4xx_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
+static int ppc4xx_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 {
 	struct ppc4xx_gpio_chip *chip = gpiochip_get_data(gc);
 	unsigned long flags;
@@ -88,6 +87,8 @@ ppc4xx_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 	spin_unlock_irqrestore(&chip->lock, flags);
 
 	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
+
+	return 0;
 }
 
 static int ppc4xx_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
@@ -179,7 +180,7 @@ static int __init ppc4xx_add_gpiochips(void)
 		gc->direction_input = ppc4xx_gpio_dir_in;
 		gc->direction_output = ppc4xx_gpio_dir_out;
 		gc->get = ppc4xx_gpio_get;
-		gc->set = ppc4xx_gpio_set;
+		gc->set_rv = ppc4xx_gpio_set;
 
 		ret = of_mm_gpiochip_add_data(np, mm_gc, ppc4xx_gc);
 		if (ret)