pinctrl: meson: implement the gpio_chip get_direction callback

Implement the get_direction callback so we read the direction from the
actual GPIO controller register. This is recommended by the gpio_chip
kernel doc.

Signed-off-by: Martin Blumenstingl <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/meson/pinctrl-meson.c

···
 	.is_generic		= true,
 };
 
+static int meson_gpio_get_direction(struct gpio_chip *chip, unsigned gpio)
+{
+	struct meson_pinctrl *pc = gpiochip_get_data(chip);
+	int ret;
+
+	ret = meson_pinconf_get_output(pc, gpio);
+	if (ret < 0)
+		return ret;
+
+	return ret ? GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN;
+}
+
 static int meson_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
 {
 	return meson_pinconf_set_output(gpiochip_get_data(chip), gpio, false);
···
 	pc->chip.parent = pc->dev;
 	pc->chip.request = gpiochip_generic_request;
 	pc->chip.free = gpiochip_generic_free;
+	pc->chip.get_direction = meson_gpio_get_direction;
 	pc->chip.direction_input = meson_gpio_direction_input;
 	pc->chip.direction_output = meson_gpio_direction_output;
 	pc->chip.get = meson_gpio_get;