gpio: xgene: 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: Feng Kan <fkan@apm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-xgene.c

@@ -47,14 +47,9 @@ struct xgene_gpio {
 #endif
 };
 
-static inline struct xgene_gpio *to_xgene_gpio(struct gpio_chip *chip)
-{
-	return container_of(chip, struct xgene_gpio, chip);
-}
-
 static int xgene_gpio_get(struct gpio_chip *gc, unsigned int offset)
 {
-	struct xgene_gpio *chip = to_xgene_gpio(gc);
+	struct xgene_gpio *chip = gpiochip_get_data(gc);
 	unsigned long bank_offset;
 	u32 bit_offset;
 
@@ -65,7 +60,7 @@ static int xgene_gpio_get(struct gpio_chip *gc, unsigned int offset)
 
 static void __xgene_gpio_set(struct gpio_chip *gc, unsigned int offset, int val)
 {
-	struct xgene_gpio *chip = to_xgene_gpio(gc);
+	struct xgene_gpio *chip = gpiochip_get_data(gc);
 	unsigned long bank_offset;
 	u32 setval, bit_offset;
 
@@ -82,7 +77,7 @@ static void __xgene_gpio_set(struct gpio_chip *gc, unsigned int offset, int val)
 
 static void xgene_gpio_set(struct gpio_chip *gc, unsigned int offset, int val)
 {
-	struct xgene_gpio *chip = to_xgene_gpio(gc);
+	struct xgene_gpio *chip = gpiochip_get_data(gc);
 	unsigned long flags;
 
 	spin_lock_irqsave(&chip->lock, flags);
@@ -92,7 +87,7 @@ static void xgene_gpio_set(struct gpio_chip *gc, unsigned int offset, int val)
 
 static int xgene_gpio_dir_in(struct gpio_chip *gc, unsigned int offset)
 {
-	struct xgene_gpio *chip = to_xgene_gpio(gc);
+	struct xgene_gpio *chip = gpiochip_get_data(gc);
 	unsigned long flags, bank_offset;
 	u32 dirval, bit_offset;
 
@@ -113,7 +108,7 @@ static int xgene_gpio_dir_in(struct gpio_chip *gc, unsigned int offset)
 static int xgene_gpio_dir_out(struct gpio_chip *gc,
 					unsigned int offset, int val)
 {
-	struct xgene_gpio *chip = to_xgene_gpio(gc);
+	struct xgene_gpio *chip = gpiochip_get_data(gc);
 	unsigned long flags, bank_offset;
 	u32 dirval, bit_offset;
 
@@ -198,7 +193,7 @@ static int xgene_gpio_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, gpio);
 
-	err = gpiochip_add(&gpio->chip);
+	err = gpiochip_add_data(&gpio->chip, gpio);
 	if (err) {
 		dev_err(&pdev->dev,
 			"failed to register gpiochip.\n");