arm64: dts: ti: Add DT overlay for PCIe + USB3.0 SERDES personality card

Add overlay for PCIe (uses the second instance of PCIe in AM654x) and
USB3.0 SERDES personality card

The PCIe3/USB3 card is provided with the AM65x GP EVM configuration [1]
so apply the overlay to k3-am654-gp-evm.dtb

[1] https://www.ti.com/lit/ug/spruim7/spruim7.pdf

Signed-off-by: Kishon Vijay Abraham I <[e-mail]>
Signed-off-by: Roger Quadros <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vignesh Raghavendra <[e-mail]>

arch/arm64/boot/dts/ti/Makefile

···
 dtb-$(CONFIG_ARCH_K3) += k3-am64-tqma64xxl-mbax4xxl-wlan.dtbo
 
 # Boards with AM65x SoC
-k3-am654-gp-evm-dtbs := k3-am654-base-board.dtb k3-am654-base-board-rocktech-rk101-panel.dtbo
+k3-am654-gp-evm-dtbs := k3-am654-base-board.dtb \
+	k3-am654-base-board-rocktech-rk101-panel.dtbo \
+	k3-am654-pcie-usb3.dtbo
 k3-am654-evm-dtbs := k3-am654-base-board.dtb k3-am654-icssg2.dtbo
 k3-am654-idk-dtbs := k3-am654-evm.dtb k3-am654-idk.dtbo k3-am654-pcie-usb2.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-am6528-iot2050-basic.dtb
···
 dtb-$(CONFIG_ARCH_K3) += k3-am654-idk.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am654-base-board-rocktech-rk101-panel.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-am654-pcie-usb2.dtbo
+dtb-$(CONFIG_ARCH_K3) += k3-am654-pcie-usb3.dtbo
 
 # Boards with J7200 SoC
 k3-j7200-evm-dtbs := k3-j7200-common-proc-board.dtb k3-j7200-evm-quad-port-eth-exp.dtbo

arch/arm64/boot/dts/ti/k3-am654-pcie-usb3.dtso

···
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/**
+ * DT overlay for SERDES personality card: 1lane PCIe + USB3.0 DRD on AM654 EVM
+ *
+ * Copyright (C) 2018-2024 Texas Instruments Incorporated - http://www.ti.com/
+ */
+
+/dts-v1/;
+/plugin/;
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/phy/phy.h>
+#include <dt-bindings/phy/phy-am654-serdes.h>
+
+#include "k3-pinctrl.h"
+
+&serdes1 {
+	status = "okay";
+};
+
+&pcie1_rc {
+	num-lanes = <1>;
+	phys = <&serdes1 PHY_TYPE_PCIE 0>;
+	phy-names = "pcie-phy0";
+	reset-gpios = <&pca9555 5 GPIO_ACTIVE_HIGH>;
+	status = "okay";
+};
+
+&main_pmx0 {
+	usb0_pins_default: usb0-default-pins {
+		pinctrl-single,pins = <
+			AM65X_IOPAD(0x02bc, PIN_OUTPUT, 0) /* (AD9) USB0_DRVVBUS */
+		>;
+	};
+};
+
+&serdes0 {
+	status = "okay";
+	assigned-clocks = <&k3_clks 153 4>, <&serdes0 AM654_SERDES_CMU_REFCLK>;
+	assigned-clock-parents = <&k3_clks 153 7>, <&k3_clks 153 4>;
+};
+
+&dwc3_0 {
+	status = "okay";
+	assigned-clock-parents = <&k3_clks 151 4>,      /* set REF_CLK to 20MHz i.e. PER0_PLL/48 */
+	<&k3_clks 151 8>;      /* set PIPE3_TXB_CLK to WIZ8B2M4VSB */
+	phys = <&serdes0 PHY_TYPE_USB3 0>;
+	phy-names = "usb3-phy";
+};
+
+&usb0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&usb0_pins_default>;
+	dr_mode = "host";
+	maximum-speed = "super-speed";
+	snps,dis-u1-entry-quirk;
+	snps,dis-u2-entry-quirk;
+};
+
+&usb0_phy {
+	status = "okay";
+};