MIPS: rb532: use gpiochip data pointer

This makes the driver use the data pointer added to the gpio_chip
to store a pointer to the state container instead of relying on
container_of().

Cc: linux-mips@linux-mips.org
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/mips/rb532/gpio.c

@@ -32,7 +32,7 @@
 #include <linux/export.h>
 #include <linux/spinlock.h>
 #include <linux/platform_device.h>
-#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
 
 #include <asm/mach-rc32434/rb.h>
 #include <asm/mach-rc32434/gpio.h>
@@ -88,7 +88,7 @@ static int rb532_gpio_get(struct gpio_chip *chip, unsigned offset)
 {
 	struct rb532_gpio_chip	*gpch;
 
-	gpch = container_of(chip, struct rb532_gpio_chip, chip);
+	gpch = gpiochip_get_data(chip);
 	return !!rb532_get_bit(offset, gpch->regbase + GPIOD);
 }
 
@@ -100,7 +100,7 @@ static void rb532_gpio_set(struct gpio_chip *chip,
 {
 	struct rb532_gpio_chip	*gpch;
 
-	gpch = container_of(chip, struct rb532_gpio_chip, chip);
+	gpch = gpiochip_get_data(chip);
 	rb532_set_bit(value, offset, gpch->regbase + GPIOD);
 }
 
@@ -111,7 +111,7 @@ static int rb532_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 {
 	struct rb532_gpio_chip	*gpch;
 
-	gpch = container_of(chip, struct rb532_gpio_chip, chip);
+	gpch = gpiochip_get_data(chip);
 
 	/* disable alternate function in case it's set */
 	rb532_set_bit(0, offset, gpch->regbase + GPIOFUNC);
@@ -128,7 +128,7 @@ static int rb532_gpio_direction_output(struct gpio_chip *chip,
 {
 	struct rb532_gpio_chip	*gpch;
 
-	gpch = container_of(chip, struct rb532_gpio_chip, chip);
+	gpch = gpiochip_get_data(chip);
 
 	/* disable alternate function in case it's set */
 	rb532_set_bit(0, offset, gpch->regbase + GPIOFUNC);
@@ -200,7 +200,7 @@ int __init rb532_gpio_init(void)
 	}
 
 	/* Register our GPIO chip */
-	gpiochip_add(&rb532_gpio_chip->chip);
+	gpiochip_add_data(&rb532_gpio_chip->chip, rb532_gpio_chip);
 
 	return 0;
 }