arm64: dts: qcom: sm7225-fairphone-fp4: Enable display and GPU

Add the description for the display panel found on this phone.
Unfortunately the LCDB module on PM6150L isn't yet supported upstream so
we need to use a dummy regulator-fixed in the meantime.

And with this done we can also enable the GPU and set the zap shader
firmware path.
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Link: https://lore.kernel.org/r/20240216-fp4-panel-v3-4-a556e4b79640@fairphone.comSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/sm6350.dtsi

@@ -1332,7 +1332,7 @@ gpu: gpu@3d00000 {
 
 			status = "disabled";
 
-			zap-shader {
+			gpu_zap_shader: zap-shader {
 				memory-region = <&pil_gpu_mem>;
 			};
 

arch/arm64/boot/dts/qcom/sm7225-fairphone-fp4.dts

@@ -68,6 +68,14 @@ key-volume-up {
 		};
 	};
 
+	/* Dummy regulator until PM6150L has LCDB VSP/VSN support */
+	lcdb_dummy: regulator-lcdb-dummy {
+		compatible = "regulator-fixed";
+		regulator-name = "lcdb_dummy";
+		regulator-min-microvolt = <5500000>;
+		regulator-max-microvolt = <5500000>;
+	};
+
 	reserved-memory {
 		/*
 		 * The rmtfs memory region in downstream is 'dynamically allocated'
@@ -373,6 +381,14 @@ &gpi_dma1 {
 	status = "okay";
 };
 
+&gpu {
+	status = "okay";
+};
+
+&gpu_zap_shader {
+	firmware-name = "qcom/sm7225/fairphone4/a615_zap.mbn";
+};
+
 &i2c0 {
 	clock-frequency = <400000>;
 	status = "okay";
@@ -404,6 +420,43 @@ &ipa {
 	status = "okay";
 };
 
+&mdss {
+	status = "okay";
+};
+
+&mdss_dsi0 {
+	vdda-supply = <&vreg_l22a>;
+	status = "okay";
+
+	panel@0 {
+		compatible = "djn,9a-3r063-1102b";
+		reg = <0>;
+
+		backlight = <&pm6150l_wled>;
+		reset-gpios = <&pm6150l_gpios 9 GPIO_ACTIVE_LOW>;
+
+		vdd1-supply = <&vreg_l1e>;
+		vsn-supply = <&lcdb_dummy>;
+		vsp-supply = <&lcdb_dummy>;
+
+		port {
+			panel_in: endpoint {
+				remote-endpoint = <&mdss_dsi0_out>;
+			};
+		};
+	};
+};
+
+&mdss_dsi0_out {
+	data-lanes = <0 1 2 3>;
+	remote-endpoint = <&panel_in>;
+};
+
+&mdss_dsi0_phy {
+	vdds-supply = <&vreg_l18a>;
+	status = "okay";
+};
+
 &mpss {
 	firmware-name = "qcom/sm7225/fairphone4/modem.mbn";
 	status = "okay";