linux-kernel - [PATCH] arm64: dts: ti: k3-j784s4-evm: Add overlay for USB2.0 Type A functionality

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Message-ID: <20241017064041.880119-1-s-vadapalli@ti.com>
Date: Thu, 17 Oct 2024 12:10:41 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: <nm@...com>, <vigneshr@...com>, <kristo@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <srk@...com>,
        <s-vadapalli@...com>
Subject: [PATCH] arm64: dts: ti: k3-j784s4-evm: Add overlay for USB2.0 Type A functionality

The USB0 instance of the USB controller on the J784S4 SoC supports a single
USB interface with the possible choices being:
1. USB3.1 Gen1 Type C interface
2. Two USB2.0 Type A interfaces via an on-board USB Hub.

Add overlay to enable USB2.0 Type A functionality by:
1. Configuring the "USB2.0_MUX_SEL" mux to enable the USB Hub connected to
   the two USB2.0 Type A interfaces on the J784S4-EVM.
2. Set the Dual-Role Mode to Host.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
---

Hello,

This patch is based on linux-next tagged next-20241016.

Logs validating USB2.0 Type A interface on the J784S4-EVM:
https://gist.github.com/Siddharth-Vadapalli-at-TI/41bbcb39f331aa3bb6fd4dd694015189

Regards,
Siddharth.

 arch/arm64/boot/dts/ti/Makefile               |  4 +++
 .../arm64/boot/dts/ti/k3-j784s4-evm-usb2.dtso | 26 +++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 arch/arm64/boot/dts/ti/k3-j784s4-evm-usb2.dtso

diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
index bcd392c3206e..fc75d0365558 100644
--- a/arch/arm64/boot/dts/ti/Makefile
+++ b/arch/arm64/boot/dts/ti/Makefile
@@ -124,6 +124,7 @@ dtb-$(CONFIG_ARCH_K3) += k3-am69-sk.dtb
 dtb-$(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-$(CONFIG_ARCH_K3) += k3-j784s4-evm-usb2.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-j784s4-evm-usxgmii-exp1-exp2.dtbo
 
 # Build time test only, enabled by CONFIG_OF_ALL_DTBS
@@ -200,6 +201,8 @@ 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-usb2-dtbs := k3-j784s4-evm.dtb \
+	k3-j784s4-evm-usb2.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 \
@@ -227,6 +230,7 @@ dtb- += k3-am625-beagleplay-csi2-ov5640.dtb \
 	k3-j721s2-evm-pcie1-ep.dtb \
 	k3-j784s4-evm-pcie0-pcie1-ep.dtb \
 	k3-j784s4-evm-quad-port-eth-exp1.dtb \
+	k3-j784s4-evm-usb2.dtbo \
 	k3-j784s4-evm-usxgmii-exp1-exp2.dtb
 
 # Enable support for device-tree overlays
diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-evm-usb2.dtso b/arch/arm64/boot/dts/ti/k3-j784s4-evm-usb2.dtso
new file mode 100644
index 000000000000..02f97819aa82
--- /dev/null
+++ b/arch/arm64/boot/dts/ti/k3-j784s4-evm-usb2.dtso
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/**
+ * DT overlay for USB2.0 Type A functionality on J784S4-EVM.
+ *
+ * J784S4 EVM Product Link: https://www.ti.com/tool/J784S4XEVM
+ *
+ * Copyright (C) 2024 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;
+	};
+};
+
+&usb0 {
+	dr_mode = "host";
+};
-- 
2.40.1