arm64: dts: imx8mp-venice-gw74xx: add PCIe support

Add PCIe support on the Gateworks GW74xx board. While at it,
fix the related gpio line names from the previous incorrect values.
Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mp-venice-gw74xx.dts

@@ -8,6 +8,7 @@
 #include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/input/linux-event-codes.h>
 #include <dt-bindings/leds/common.h>
+#include <dt-bindings/phy/phy-imx8-pcie.h>
 
 #include "imx8mp.dtsi"
 
@@ -100,6 +101,12 @@ led-1 {
 		};
 	};
 
+	pcie0_refclk: pcie0-refclk {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <100000000>;
+	};
+
 	pps {
 		compatible = "pps-gpio";
 		pinctrl-names = "default";
@@ -216,8 +223,8 @@ &gpio1 {
 &gpio2 {
 	gpio-line-names =
 		"", "", "", "", "", "", "", "",
-		"", "", "", "", "", "", "", "",
-		"pcie3_wdis#", "", "", "pcie1_wdis@", "pcie2_wdis#", "", "", "",
+		"", "", "", "", "", "", "pcie3_wdis#", "",
+		"", "", "pcie2_wdis#", "", "", "", "", "",
 		"", "", "", "", "", "", "", "";
 };
 
@@ -558,6 +565,28 @@ &i2c4 {
 	status = "okay";
 };
 
+&pcie_phy {
+	fsl,refclk-pad-mode = <IMX8_PCIE_REFCLK_PAD_INPUT>;
+	fsl,clkreq-unsupported;
+	clocks = <&pcie0_refclk>;
+	clock-names = "ref";
+	status = "okay";
+};
+
+&pcie {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pcie0>;
+	reset-gpio = <&gpio2 17 GPIO_ACTIVE_LOW>;
+	clocks = <&clk IMX8MP_CLK_HSIO_ROOT>,
+		 <&clk IMX8MP_CLK_PCIE_ROOT>,
+		 <&clk IMX8MP_CLK_HSIO_AXI>;
+	clock-names = "pcie", "pcie_aux", "pcie_bus";
+	assigned-clocks = <&clk IMX8MP_CLK_PCIE_AUX>;
+	assigned-clock-rates = <10000000>;
+	assigned-clock-parents = <&clk IMX8MP_SYS_PLL2_50M>;
+	status = "okay";
+};
+
 /* GPS / off-board header */
 &uart1 {
 	pinctrl-names = "default";
@@ -690,7 +719,6 @@ pinctrl_hog: hoggrp {
 			MX8MP_IOMUXC_GPIO1_IO09__GPIO1_IO09	0x40000040 /* DIO0 */
 			MX8MP_IOMUXC_GPIO1_IO11__GPIO1_IO11	0x40000040 /* DIO1 */
 			MX8MP_IOMUXC_NAND_DQS__GPIO3_IO14	0x40000040 /* M2SKT_OFF# */
-			MX8MP_IOMUXC_SD2_DATA2__GPIO2_IO17	0x40000150 /* PCIE1_WDIS# */
 			MX8MP_IOMUXC_SD2_DATA3__GPIO2_IO18	0x40000150 /* PCIE2_WDIS# */
 			MX8MP_IOMUXC_SD2_CMD__GPIO2_IO14	0x40000150 /* PCIE3_WDIS# */
 			MX8MP_IOMUXC_NAND_DATA00__GPIO3_IO06	0x40000040 /* M2SKT_RST# */
@@ -803,6 +831,12 @@ MX8MP_IOMUXC_SD2_DATA1__GPIO2_IO16	0x10
 		>;
 	};
 
+	pinctrl_pcie0: pciegrp {
+		fsl,pins = <
+			MX8MP_IOMUXC_SD2_DATA2__GPIO2_IO17	0x110
+		>;
+	};
+
 	pinctrl_pmic: pmicgrp {
 		fsl,pins = <
 			MX8MP_IOMUXC_NAND_DATA01__GPIO3_IO07	0x140