pinctrl/abx500: adjust offset for get_mode()

The set_mode() and get_mode() functions in the abx500 were
not mirrored, leading to the wrong GPIO control bits being
read out.

Cc: Lee Jones <lee.jones@linaro.org>
Reported-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-abx500.c

@@ -401,6 +401,8 @@ static u8 abx500_get_mode(struct pinctrl_dev *pctldev, struct gpio_chip *chip,
 	bool alt_bit2;
 	struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
 	struct alternate_functions af = pct->soc->alternate_functions[gpio];
+	/* on ABx5xx, there is no GPIO0, so adjust the offset */
+	unsigned offset = gpio - 1;
 
 	/*
 	 * if gpiosel_bit is set to unused,
@@ -410,7 +412,7 @@ static u8 abx500_get_mode(struct pinctrl_dev *pctldev, struct gpio_chip *chip,
 		return ABX500_DEFAULT;
 
 	/* read GpioSelx register */
-	abx500_gpio_get_bit(chip, AB8500_GPIO_SEL1_REG + (gpio / 8),
+	abx500_gpio_get_bit(chip, AB8500_GPIO_SEL1_REG + (offset / 8),
 			af.gpiosel_bit, &bit_mode);
 	mode = bit_mode;