On the stm32mp157fc-dk2 board, we can observe the hdp GPOVAL function on
SoC pin E13 accessible on the pin 5 on the Arduino connector CN13.
Add the relevant configuration but keep it disabled as it's used for
debug only.

Signed-off-by: Clément Le Goffic <redacted>
---
 arch/arm/boot/dts/st/stm32mp157c-dk2.dts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm/boot/dts/st/stm32mp157c-dk2.dts b/arch/arm/boot/dts/st/stm32mp157c-dk2.dts
index 1b34fbe10b4f..a6ae6ca14cdc 100644
--- a/arch/arm/boot/dts/st/stm32mp157c-dk2.dts
+++ b/arch/arm/boot/dts/st/stm32mp157c-dk2.dts

@@ -63,6 +63,12 @@ &dsi_out {
 	remote-endpoint = <&panel_in>;
 };
 
+&hdp {
+	pinctrl-names = "default", "sleep";
+	pinctrl-0 = <&hdp2_gpo &hdp2_pins_a>;
+	pinctrl-1 = <&hdp2_sleep_pins_a>;
+};
+
 &i2c1 {
 	touchscreen@38 {
 		compatible = "focaltech,ft6236";

-- 
2.43.0