gpio: f7188: 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: Andreas Bofjall <andreas@gazonk.org>
Cc: Simon Guinot <simon.guinot@sequanux.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-f7188x.c

@@ -193,8 +193,7 @@ static struct f7188x_gpio_bank f71889_gpio_bank[] = {
 static int f7188x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
 {
 	int err;
-	struct f7188x_gpio_bank *bank =
-		container_of(chip, struct f7188x_gpio_bank, chip);
+	struct f7188x_gpio_bank *bank = gpiochip_get_data(chip);
 	struct f7188x_sio *sio = bank->data->sio;
 	u8 dir;
 
@@ -215,8 +214,7 @@ static int f7188x_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
 static int f7188x_gpio_get(struct gpio_chip *chip, unsigned offset)
 {
 	int err;
-	struct f7188x_gpio_bank *bank =
-		container_of(chip, struct f7188x_gpio_bank, chip);
+	struct f7188x_gpio_bank *bank = gpiochip_get_data(chip);
 	struct f7188x_sio *sio = bank->data->sio;
 	u8 dir, data;
 
@@ -241,8 +239,7 @@ static int f7188x_gpio_direction_out(struct gpio_chip *chip,
 				     unsigned offset, int value)
 {
 	int err;
-	struct f7188x_gpio_bank *bank =
-		container_of(chip, struct f7188x_gpio_bank, chip);
+	struct f7188x_gpio_bank *bank = gpiochip_get_data(chip);
 	struct f7188x_sio *sio = bank->data->sio;
 	u8 dir, data_out;
 
@@ -270,8 +267,7 @@ static int f7188x_gpio_direction_out(struct gpio_chip *chip,
 static void f7188x_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 {
 	int err;
-	struct f7188x_gpio_bank *bank =
-		container_of(chip, struct f7188x_gpio_bank, chip);
+	struct f7188x_gpio_bank *bank = gpiochip_get_data(chip);
 	struct f7188x_sio *sio = bank->data->sio;
 	u8 data_out;
 
@@ -336,7 +332,7 @@ static int f7188x_gpio_probe(struct platform_device *pdev)
 		bank->chip.parent = &pdev->dev;
 		bank->data = data;
 
-		err = gpiochip_add(&bank->chip);
+		err = gpiochip_add_data(&bank->chip, bank);
 		if (err) {
 			dev_err(&pdev->dev,
 				"Failed to register gpiochip %d: %d\n",