[PATCH 1/2] gpio: gpio-uclass: add OPEN_DRAIN flag parsing

[Artem Lapkin]

add GPIOD_OPEN_DRAIN flag which cant parsed properly

Problem: for example cant power video system for sm1 g12a socs
because OPEN_DRAIN flag cant parsed

DTS examples:

```
$ grep GPIO_OPEN_DRAIN\>  arch/arm/dts/meson-*.dt*
arch/arm/dts/meson-g12a-sei510.dts:		gpio = <&gpio GPIOH_8 GPIO_OPEN_DRAIN>;
arch/arm/dts/meson-g12a-u200.dts:		gpio = <&gpio GPIOH_8 GPIO_OPEN_DRAIN>;
arch/arm/dts/meson-gx-libretech-pc.dtsi:	gpio = <&gpio GPIOH_3 GPIO_OPEN_DRAIN>;
arch/arm/dts/meson-khadas-vim3.dtsi:		gpio = <&gpio GPIOH_8 GPIO_OPEN_DRAIN>;
arch/arm/dts/meson-sm1-sei610.dts:		gpio = <&gpio GPIOH_8 GPIO_OPEN_DRAIN>;
```

Signed-off-by: Artem Lapkin <art at khadas.com>
---
 drivers/gpio/gpio-uclass.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpio/gpio-uclass.c b/drivers/gpio/gpio-uclass.c
index bad6b71e0c..6225f32457 100644
--- a/drivers/gpio/gpio-uclass.c
+++ b/drivers/gpio/gpio-uclass.c
@@ -574,6 +574,15 @@ int dm_gpio_set_value(const struct gpio_desc *desc, int value)
 	if (ret)
 		return ret;
 
+	if (desc->flags & GPIOD_OPEN_DRAIN) {
+		if (value)
+			gpio_get_ops(desc->dev)->direction_input(desc->dev, desc->offset);
+		else
+			gpio_get_ops(desc->dev)->direction_output(desc->dev, desc->offset, 0);
+
+		return 0;
+	}
+
 	if (desc->flags & GPIOD_ACTIVE_LOW)
 		value = !value;
 
-- 
2.25.1