arm64: dts: qcom: c630: add panel bridge 1p2 regulator

The VCC and VCCA supplies of the DSI<->eDP bridge are derived from
vreg_l2a_1p2 and controlled by a GPIO on the PMIC. Add the regulator
here so Linux can control it.
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
Link: https://lore.kernel.org/r/20230627-c630-uart-and-1p2-reg-v2-1-496b581935c1@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/sdm850-lenovo-yoga-c630.dts

@@ -80,6 +80,22 @@ adsp_mem: memory@8c600000 {
 		};
 	};
 
+	sw_edp_1p2: edp-1p2-regulator {
+		compatible = "regulator-fixed";
+		regulator-name = "sw_edp_1p2";
+
+		regulator-min-microvolt = <1200000>;
+		regulator-max-microvolt = <1200000>;
+
+		pinctrl-0 = <&sw_edp_1p2_en>;
+		pinctrl-names = "default";
+
+		gpio = <&pm8998_gpios 9 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+
+		vin-supply = <&vreg_l2a_1p2>;
+	};
+
 	sn65dsi86_refclk: sn65dsi86-refclk {
 		compatible = "fixed-clock";
 		#clock-cells = <0>;
@@ -406,6 +422,8 @@ sn65dsi86: bridge@2c {
 
 		enable-gpios = <&tlmm 96 GPIO_ACTIVE_HIGH>;
 
+		vcca-supply = <&sw_edp_1p2>;
+		vcc-supply = <&sw_edp_1p2>;
 		vpll-supply = <&vreg_l14a_1p88>;
 		vccio-supply = <&vreg_l14a_1p88>;
 
@@ -500,6 +518,16 @@ &mss_pil {
 	firmware-name = "qcom/sdm850/LENOVO/81JL/qcdsp1v2850.mbn", "qcom/sdm850/LENOVO/81JL/qcdsp2850.mbn";
 };
 
+&pm8998_gpios {
+	/* This pin is pulled down by a fixed resistor */
+	sw_edp_1p2_en: pm8998-gpio9-state {
+		pins = "gpio9";
+		function = "normal";
+		bias-disable;
+		qcom,drive-strength = <0>;
+	};
+};
+
 &qup_i2c10_default {
 	drive-strength = <2>;
 	bias-disable;