[PATCH] gpio: realtek-otto: add pinctrl support

[Michael Zavertkin <misha.zavertkin@mail.ru>]

RTL9607C relies on pinctrl to mux SoC pins. Use pinctrl to request pins
for GPIO

Signed-off-by: Michael Zavertkin <misha.zavertkin@mail.ru>
---
 drivers/gpio/gpio-realtek-otto.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-realtek-otto.c b/drivers/gpio/gpio-realtek-otto.c
index 4a606bad5848..4d594db24dd0 100644
--- a/drivers/gpio/gpio-realtek-otto.c
+++ b/drivers/gpio/gpio-realtek-otto.c
@@ -97,6 +97,11 @@ enum realtek_gpio_flags {
 	 * range, where the per-cpu enable masks are located.
 	 */
 	GPIO_INTERRUPTS_PER_CPU = BIT(2),
+	/*
+	 * Request GPIOs from pinctrl using gpiochip_generic_request()
+	 * and gpiochip_generic_free().
+	 */
+	GPIO_PINCTRL = BIT(3),
 };
 
 static struct realtek_gpio_ctrl *irq_data_to_ctrl(struct irq_data *data)
@@ -354,7 +359,7 @@ static const struct of_device_id realtek_gpio_of_match[] = {
 	},
 	{
 		.compatible = "realtek,rtl9607-gpio",
-		.data = (void *)GPIO_PORTS_REVERSED,
+		.data = (void *)(GPIO_PORTS_REVERSED | GPIO_PINCTRL),
 	},
 	{}
 };
@@ -405,6 +410,10 @@ static int realtek_gpio_probe(struct platform_device *pdev)
 		ctrl->line_imr_pos = realtek_gpio_line_imr_pos_swapped;
 	}
 
+	if (dev_flags & GPIO_PINCTRL) {
+		gen_gc_flags |= GPIO_GENERIC_PINCTRL_BACKEND;
+	}
+
 	config = (struct gpio_generic_chip_config) {
 		.dev = dev,
 		.sz = 4,
-- 
2.54.0