arm64: dts: rockchip: Enable PCIe controller on rock3a

Add the nodes to enable the PCIe controller on the
Radxa ROCK3 Model A board. Run test with the MT7921
pcie wireless card.
Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
Link: https://lore.kernel.org/r/20220726023516.6487-1-amadeus@jmu.edu.cnSigned-off-by: Heiko Stuebner <heiko@sntech.de>

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

@@ -67,6 +67,18 @@ vcc12v_dcin: vcc12v-dcin {
 		regulator-boot-on;
 	};
 
+	vcc3v3_pcie: vcc3v3-pcie-regulator {
+		compatible = "regulator-fixed";
+		enable-active-high;
+		gpios = <&gpio0 RK_PD4 GPIO_ACTIVE_HIGH>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pcie_enable_h>;
+		regulator-name = "vcc3v3_pcie";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		vin-supply = <&vcc5v0_sys>;
+	};
+
 	vcc3v3_sys: vcc3v3-sys {
 		compatible = "regulator-fixed";
 		regulator-name = "vcc3v3_sys";
@@ -173,6 +185,10 @@ &combphy1 {
 	status = "okay";
 };
 
+&combphy2 {
+	status = "okay";
+};
+
 &cpu0 {
 	cpu-supply = <&vdd_cpu>;
 };
@@ -522,6 +538,14 @@ rgmii_phy1: ethernet-phy@0 {
 	};
 };
 
+&pcie2x1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pcie_reset_h>;
+	reset-gpios = <&gpio3 RK_PC1 GPIO_ACTIVE_HIGH>;
+	vpcie3v3-supply = <&vcc3v3_pcie>;
+	status = "okay";
+};
+
 &pinctrl {
 	cam {
 		vcc_cam_en: vcc_cam_en {
@@ -553,6 +577,16 @@ led_user_en: led_user_en {
 		};
 	};
 
+	pcie {
+		pcie_enable_h: pcie-enable-h {
+			rockchip,pins = <0 RK_PD4 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+
+		pcie_reset_h: pcie-reset-h {
+			rockchip,pins = <3 RK_PC1 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+
 	pmic {
 		pmic_int: pmic_int {
 			rockchip,pins =