arm64: dts: ti: k3-j721s2-evm: Add overlay to enable USB0 Type-A

The J721S2-EVM (J721S2-SOM mounted on the J7 Common Processor Board) has
a single instance of USB namely USB0. On the board, USB0 can be enabled
using a single USB interface at a time among the following:
1. USB3.1 Gen1 Type C interface
2. Two USB2.0 Type A interfaces via an on-board USB Hub

By default, USB0 is enabled using the USB3.1 Gen1 Type C interface. Hence,
add a device-tree overlay to allow using USB0 with the USB2.0 Type A
interfaces by configuring the "USB2.0_MUX_SEL" mux. Also, since the Type A
interfaces only connect to USB Devices with USB0 acting as the USB Host,
set the Dual-Role mode for USB0 to Host.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Link: https://patch.msgid.link/20250912062021.2906034-1-s-vadapalli@ti.com
Signed-off-by: Nishanth Menon <nm@ti.com>

diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
index 28642ef98a32fb527db13f00f06fbdab743275fe..743115b849a7ae58c1d0577f54810a9940d4136f 100644 (file)
--- a/arch/arm64/boot/dts/ti/Makefile
+++ b/arch/arm64/boot/dts/ti/Makefile
@@ -134,6 +134,7 @@ dtb-$(CONFIG_ARCH_K3) += k3-j721s2-evm-gesi-exp-board.dtbo
 k3-j721s2-evm-dtbs := k3-j721s2-common-proc-board.dtb k3-j721s2-evm-gesi-exp-board.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-j721s2-evm.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-j721s2-evm-pcie1-ep.dtbo
+dtb-$(CONFIG_ARCH_K3) += k3-j721s2-evm-usb0-type-a.dtbo
 
 # Boards with J722s SoC
 dtb-$(CONFIG_ARCH_K3) += k3-am67a-beagley-ai.dtb
@@ -235,6 +236,8 @@ k3-j721e-sk-csi2-dual-imx219-dtbs := k3-j721e-sk.dtb \
        k3-j721e-sk-csi2-dual-imx219.dtbo
 k3-j721s2-evm-pcie1-ep-dtbs := k3-j721s2-common-proc-board.dtb \
        k3-j721s2-evm-pcie1-ep.dtbo
+k3-j721s2-evm-usb0-type-a-dtbs := k3-j721s2-common-proc-board.dtb \
+       k3-j721s2-evm-usb0-type-a.dtbo
 k3-j722s-evm-csi2-quad-rpi-cam-imx219-dtbs := k3-j722s-evm.dtb \
        k3-j722s-evm-csi2-quad-rpi-cam-imx219.dtbo
 k3-j722s-evm-csi2-quad-tevi-ov5640-dtbs := k3-j722s-evm.dtb \
@@ -277,6 +280,7 @@ dtb- += k3-am625-beagleplay-csi2-ov5640.dtb \
        k3-j721e-evm-pcie1-ep.dtb \
        k3-j721e-sk-csi2-dual-imx219.dtb \
        k3-j721s2-evm-pcie1-ep.dtb \
+       k3-j721s2-evm-usb0-type-a.dtb \
        k3-j722s-evm-csi2-quad-rpi-cam-imx219.dtb \
        k3-j722s-evm-csi2-quad-tevi-ov5640.dtb \
        k3-j742s2-evm-usb0-type-a.dtb \

diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-evm-usb0-type-a.dtso b/arch/arm64/boot/dts/ti/k3-j721s2-evm-usb0-type-a.dtso
new file mode 100644 (file)
index 0000000..fe4a23e
--- /dev/null
+++ b/arch/arm64/boot/dts/ti/k3-j721s2-evm-usb0-type-a.dtso
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/**
+ * DT Overlay for enabling USB0 instance of USB in the Host Mode of operation
+ * with the Type-A Connector on the J7 common processor board.
+ *
+ * J7 Common Processor Board Product Link: https://www.ti.com/tool/J721EXCPXEVM
+ *
+ * Copyright (C) 2025 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+
+&exp_som {
+       p0-hog {
+               /* P0 - USB2.0_MUX_SEL */
+               gpio-hog;
+               gpios = <0 GPIO_ACTIVE_HIGH>;
+               output-high;
+               line-name = "USB2.0_MUX_SEL";
+       };
+};
+
+&usb0 {
+       dr_mode = "host";
+};