arm64: dts: ti: k3-j784s4-j742s2-evm: Add overlay to enable USB0 Type-A

Commit Message

Siddharth Vadapalli Jan. 24, 2025, 12:41 p.m. UTC

The USB0 instance of the USB controller on both the J742S2 EVM and the
J784S4 EVM supports 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, the USB3.1 Gen1 Type C interface is supported on both of the
EVMs. Enable the USB2.0 Type A interface by configuring the USB2.0_MUX_SEL
mux. Additionally, set the Dual-Role Mode to Host since a Type-A interface
is only associated with the Host Mode of operation.

Signed-off-by: Siddharth Vadapalli <[e-mail]>
---

Hello,

This patch is based on linux-next tagged next-20250124.
Since Linux boot is broken on all TI K3 SoCs including
J742S2 and J784S4 due to:
https://github.com/torvalds/linux/commit/ba5095ebbc7a
as indicated at:
https://lore.kernel.org/r/[e-mail]/
this patch was tested on J784S4-EVM by reverting the aforementioned commit.
Logs validating the USB2.0 Type-A Connector on J784S4-EVM using a USB Pen
Drive:
https://gist.github.com/Siddharth-Vadapalli-at-TI/663d703912ae574e39d7a78421e404c8

Regards,
Siddharth.

 arch/arm64/boot/dts/ti/Makefile               |  7 +++++
 .../ti/k3-j784s4-j742s2-evm-usb0-type-a.dtso  | 29 +++++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-usb0-type-a.dtso

Patch

diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
index 8a4bdf87e2d4..95b8fd0981d7 100644
--- a/arch/arm64/boot/dts/ti/Makefile
+++ b/arch/arm64/boot/dts/ti/Makefile
@@ -127,6 +127,7 @@  dtb-$(CONFIG_ARCH_K3) += k3-j784s4-evm.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-j784s4-evm-pcie0-pcie1-ep.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-j784s4-evm-quad-port-eth-exp1.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-j784s4-evm-usxgmii-exp1-exp2.dtbo
+dtb-$(CONFIG_ARCH_K3) += k3-j784s4-j742s2-evm-usb0-type-a.dtbo
 
 # Boards with J742S2 SoC
 dtb-$(CONFIG_ARCH_K3) += k3-j742s2-evm.dtb
@@ -209,10 +210,14 @@  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-j742s2-evm-usb0-type-a-dtbs := k3-j742s2-evm.dtb \
+	k3-j784s4-j742s2-evm-usb0-type-a.dtbo
 k3-j784s4-evm-pcie0-pcie1-ep-dtbs := k3-j784s4-evm.dtb \
 	k3-j784s4-evm-pcie0-pcie1-ep.dtbo
 k3-j784s4-evm-quad-port-eth-exp1-dtbs := k3-j784s4-evm.dtb \
 	k3-j784s4-evm-quad-port-eth-exp1.dtbo
+k3-j784s4-evm-usb0-type-a-dtbs := k3-j784s4-evm.dtb \
+	k3-j784s4-j742s2-evm-usb0-type-a.dtbo
 k3-j784s4-evm-usxgmii-exp1-exp2-dtbs := k3-j784s4-evm.dtb \
 	k3-j784s4-evm-usxgmii-exp1-exp2.dtbo
 dtb- += k3-am625-beagleplay-csi2-ov5640.dtb \
@@ -243,8 +248,10 @@  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-j742s2-evm-usb0-type-a.dtb \
 	k3-j784s4-evm-pcie0-pcie1-ep.dtb \
 	k3-j784s4-evm-quad-port-eth-exp1.dtb \
+	k3-j784s4-evm-usb0-type-a.dtb \
 	k3-j784s4-evm-usxgmii-exp1-exp2.dtb
 
 # Enable support for device-tree overlays
diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-usb0-type-a.dtso b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-usb0-type-a.dtso
new file mode 100644
index 000000000000..ba15d72d86d6
--- /dev/null
+++ b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-usb0-type-a.dtso
@@ -0,0 +1,29 @@ 
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/**
+ * DT Overlay for enabling USB0 instance of USB on J784S4 and J742S2 EVMs for
+ * Host Mode of operation with the Type-A Connector.
+ *
+ * J784S4 EVM Product Link: https://www.ti.com/tool/J784S4XEVM
+ * J742S2 EVM Product Link: https://www.ti.com/tool/J742S2XH01EVM
+ *
+ * Copyright (C) 2025 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+
+&exp2 {
+	p12-hog {
+		/* P12 - USB2.0_MUX_SEL */
+		gpio-hog;
+		gpios = <12 GPIO_ACTIVE_HIGH>;
+		output-high;
+		line-name = "USB2.0_MUX_SEL";
+	};
+};
+
+&usb0 {
+	dr_mode = "host";
+};