ARM: dts: imx6sx: Add Root Port node and PERST property

Since describing the PCIe PERST# property under Host Bridge node is now
deprecated, it is recommended to add it to the Root Port node, so
creating the Root Port node and add the reset-gpios property in Root
Port.

Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>

Author: SherrySun5

arch/arm/boot/dts/nxp/imx/imx6sx-sdb.dtsi

@@ -282,11 +282,16 @@
 &pcie {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_pcie>;
+	/* This property is deprecated, use reset-gpios from the Root Port node. */
 	reset-gpio = <&gpio2 0 GPIO_ACTIVE_LOW>;
 	vpcie-supply = <&reg_pcie_gpio>;
 	status = "okay";
 };
 
+&pcie_port0 {
+	reset-gpios = <&gpio2 0 GPIO_ACTIVE_LOW>;
+};
+
 &lcdif1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_lcd>;

arch/arm/boot/dts/nxp/imx/imx6sx.dtsi

@@ -1470,6 +1470,17 @@
 			power-domains = <&pd_disp>, <&pd_pci>;
 			power-domain-names = "pcie", "pcie_phy";
 			status = "disabled";
+
+			pcie_port0: pcie@0 {
+				compatible = "pciclass,0604";
+				device_type = "pci";
+				reg = <0x0 0x0 0x0 0x0 0x0>;
+				bus-range = <0x01 0xff>;
+
+				#address-cells = <3>;
+				#size-cells = <2>;
+				ranges;
+			};
 		};
 	};
 };