arm64: dts: rockchip: add vcc_cam regulator to rock-3a

The Radxa ROCK3 Model A features a voltage regulator that provides
a 3V3 supply to the MIPI CSI connector. Add this regulator to the
device tree of the board.
Signed-off-by: Michael Riesch <michael.riesch@wolfvision.net>
Link: https://lore.kernel.org/r/20220712133204.2524942-1-michael.riesch@wolfvision.netSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dts

@@ -131,6 +131,22 @@ vcc5v0_usb_otg: vcc5v0-usb-otg-regulator {
 		regulator-max-microvolt = <5000000>;
 		vin-supply = <&vcc5v0_usb>;
 	};
+
+	vcc_cam: vcc-cam {
+		compatible = "regulator-fixed";
+		enable-active-high;
+		gpio = <&gpio1 RK_PB1 GPIO_ACTIVE_HIGH>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&vcc_cam_en>;
+		regulator-name = "vcc_cam";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		vin-supply = <&vcc3v3_sys>;
+
+		regulator-state-mem {
+			regulator-off-in-suspend;
+		};
+	};
 };
 
 &combphy0 {
@@ -462,6 +478,12 @@ rgmii_phy1: ethernet-phy@0 {
 };
 
 &pinctrl {
+	cam {
+		vcc_cam_en: vcc_cam_en {
+			rockchip,pins = <1 RK_PB1 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+
 	ethernet {
 		eth_phy_rst: eth_phy_rst {
 			rockchip,pins = <3 RK_PB0 RK_FUNC_GPIO &pcfg_pull_none>;