arm64: dts: ti: Add DT overlay for PCIe + USB2.0 SERDES personality card

Enable both SERDES and PCIe DT nodes in order to get PCIe working on
the SERDES PCIe x2 personality card.

The daughter card also has a USB 2.0 dual-role port. As the base board
already supports a 2.0 dual-role port, enable the port on the SERDES
card to be a host only port.

This will prevent user confusion as having 2 ports in device mode often
leads to confusion as to which port is bound to the gadget function driver.

The PCIe x2 card is provided with the AM65x IDK configuration [1]
so apply the overlay to k3-am654-idk.dtb

[1] https://www.ti.com/lit/ug/spruim6a/spruim6a.pdf

Co-developed-by: Kishon Vijay Abraham I <[e-mail]>
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

···
 # Boards with AM65x SoC
 k3-am654-gp-evm-dtbs := k3-am654-base-board.dtb k3-am654-base-board-rocktech-rk101-panel.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-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-am6528-iot2050-basic-pg2.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-am6548-iot2050-advanced.dtb
···
 dtb-$(CONFIG_ARCH_K3) += k3-am654-evm.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
 
 # 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-usb2.dtso

···
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/**
+ * DT overlay for SERDES personality card: 2lane PCIe + USB2.0 Host on AM654 EVM
+ *
+ * Copyright (C) 2018-2024 Texas Instruments Incorporated - https://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"
+
+&serdes0 {
+	assigned-clocks = <&k3_clks 153 4>,
+			  <&serdes0 AM654_SERDES_CMU_REFCLK>,
+			  <&serdes0 AM654_SERDES_RO_REFCLK>;
+	assigned-clock-parents = <&k3_clks 153 8>,
+				 <&k3_clks 153 4>,
+				 <&k3_clks 153 4>;
+	status = "okay";
+};
+
+&serdes1 {
+	assigned-clocks = <&serdes1 AM654_SERDES_CMU_REFCLK>;
+	assigned-clock-parents = <&serdes0 AM654_SERDES_RO_REFCLK>;
+	status = "okay";
+};
+
+&pcie0_rc {
+	num-lanes = <2>;
+	phys = <&serdes0 PHY_TYPE_PCIE 1>, <&serdes1 PHY_TYPE_PCIE 1>;
+	phy-names = "pcie-phy0", "pcie-phy1";
+	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 */
+		>;
+	};
+};
+
+&dwc3_0 {
+	status = "okay";
+};
+
+&usb0_phy {
+	status = "okay";
+};
+
+&usb0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&usb0_pins_default>;
+	dr_mode = "host";
+};