gpio: spear-spics: 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: Shiraz Hashim <shiraz.linux.kernel@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-spear-spics.c

@@ -62,8 +62,7 @@ static int spics_get_value(struct gpio_chip *chip, unsigned offset)
 
 static void spics_set_value(struct gpio_chip *chip, unsigned offset, int value)
 {
-	struct spear_spics *spics = container_of(chip, struct spear_spics,
-			chip);
+	struct spear_spics *spics = gpiochip_get_data(chip);
 	u32 tmp;
 
 	/* select chip select from register */
@@ -94,8 +93,7 @@ static int spics_direction_output(struct gpio_chip *chip, unsigned offset,
 
 static int spics_request(struct gpio_chip *chip, unsigned offset)
 {
-	struct spear_spics *spics = container_of(chip, struct spear_spics,
-			chip);
+	struct spear_spics *spics = gpiochip_get_data(chip);
 	u32 tmp;
 
 	if (!spics->use_count++) {
@@ -110,8 +108,7 @@ static int spics_request(struct gpio_chip *chip, unsigned offset)
 
 static void spics_free(struct gpio_chip *chip, unsigned offset)
 {
-	struct spear_spics *spics = container_of(chip, struct spear_spics,
-			chip);
+	struct spear_spics *spics = gpiochip_get_data(chip);
 	u32 tmp;
 
 	if (!--spics->use_count) {
@@ -168,7 +165,7 @@ static int spics_gpio_probe(struct platform_device *pdev)
 	spics->chip.owner = THIS_MODULE;
 	spics->last_off = -1;
 
-	ret = gpiochip_add(&spics->chip);
+	ret = gpiochip_add_data(&spics->chip, spics);
 	if (ret) {
 		dev_err(&pdev->dev, "unable to add gpio chip\n");
 		return ret;