arm64: dts: qcom: sc7280: Add edp_out port and HPD lines

Like dp_out, we should have defined edp_out in sc7280.dtsi so we don't
need to do this in the board files.

Like dp_hot_plug_det, we should define edp_hot_plug_det in
sc7280.dtsi.

We should set the default pinctrl for edp_hot_plug_det in
sc7280.dtsi. NOTE: this is _unlike_ the dp_hot_plug_det. It is
reasonable that in some boards the dedicated DP Hot Plug Detect will
not be hooked up in favor of Type C mechanisms. This is unlike eDP
where the Hot Plug Detect line (which functions as "panel ready" in
eDP) is highly likely to be used by boards.
Signed-off-by: NDouglas Anderson <dianders@chromium.org>
Reviewed-by: NStephen Boyd <swboyd@chromium.org>
Reviewed-by: NMatthias Kaehlcke <mka@chromium.org>
Signed-off-by: NBjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220202132301.v3.7.Ic84bb69c45be2fccf50e3bd17b845fe20eec624c@changeid

arch/arm64/boot/dts/qcom/sc7280.dtsi

@@ -3012,6 +3012,8 @@
 
 			mdss_edp: edp@aea0000 {
 				compatible = "qcom,sc7280-edp";
+				pinctrl-names = "default";
+				pinctrl-0 = <&edp_hot_plug_det>;
 
 				reg = <0 0xaea0000 0 0x200>,
 				      <0 0xaea0200 0 0x200>,
@@ -3054,12 +3056,18 @@
 				ports {
 					#address-cells = <1>;
 					#size-cells = <0>;
+
 					port@0 {
 						reg = <0>;
 						edp_in: endpoint {
 							remote-endpoint = <&dpu_intf5_out>;
 						};
 					};
+
+					port@1 {
+						reg = <1>;
+						edp_out: endpoint { };
+					};
 				};
 
 				edp_opp_table: opp-table {
@@ -3279,6 +3287,11 @@
 				bias-disable;
 			};
 
+			edp_hot_plug_det: edp-hot-plug-det {
+				pins = "gpio60";
+				function = "edp_hot";
+			};
+
 			pcie1_clkreq_n: pcie1-clkreq-n {
 				pins = "gpio79";
 				function = "pcie1_clkreqn";