arm64: dts: qcom: sc7180: Add DisplayPort HPD pin dt node

This node defines alternate DP HPD functionality of GPIO.
Reviewed-by: NStephen Boyd <swboyd@chromium.org>
Signed-off-by: NTanmay Shah <tanmay@codeaurora.org>
Link: https://lore.kernel.org/r/20200818033657.16074-1-tanmay@codeaurora.orgSigned-off-by: NBjorn Andersson <bjorn.andersson@linaro.org>

arch/arm64/boot/dts/qcom/sc7180.dtsi

@@ -1447,6 +1447,19 @@
 			gpio-ranges = <&tlmm 0 0 120>;
 			wakeup-parent = <&pdc>;
 
+			dp_hot_plug_det: dp-hot-plug-det {
+				pinmux {
+					pins = "gpio117";
+					function = "dp_hot";
+				};
+
+				pinconf {
+					pins = "gpio117";
+					bias-disable;
+					input-enable;
+				};
+			};
+
 			qspi_clk: qspi-clk {
 				pinmux {
 					pins = "gpio63";