linux-kernel - [PATCH 2/2] arm64: dts: exynos: gs101-oriole: enable USB on this board

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Message-Id: <20240423-usb-dts-gs101-v1-2-3421b0371298@linaro.org>
Date: Tue, 23 Apr 2024 21:52:49 +0100
From: André Draszik <andre.draszik@...aro.org>
To: Peter Griffin <peter.griffin@...aro.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>
Cc: Tudor Ambarus <tudor.ambarus@...aro.org>, 
 Will McVicker <willmcvicker@...gle.com>, Roy Luo <royluo@...gle.com>, 
 kernel-team@...roid.com, linux-arm-kernel@...ts.infradead.org, 
 linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 André Draszik <andre.draszik@...aro.org>
Subject: [PATCH 2/2] arm64: dts: exynos: gs101-oriole: enable USB on this
 board

Pixel 6 (Oriole) has a USB-C connector that can act as host or device.

The USB role is detected dynamically using a MAX77759 TCPCI controller,
but since there is no driver for the MAX77759, the role is defaulted to
peripheral, without any endpoints / ports.

This allows Oriole to be configured as a gadget, e.g. using configfs.

As PMIC regulators are not implemented yet, we rely on USB LDOs being
enabled enabled by the bootloader. A placeholder regulator is used for
now.

Signed-off-by: André Draszik <andre.draszik@...aro.org>
---
 arch/arm64/boot/dts/exynos/google/gs101-oriole.dts | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/arm64/boot/dts/exynos/google/gs101-oriole.dts b/arch/arm64/boot/dts/exynos/google/gs101-oriole.dts
index 6be15e990b65..03b2a6fdfdc4 100644
--- a/arch/arm64/boot/dts/exynos/google/gs101-oriole.dts
+++ b/arch/arm64/boot/dts/exynos/google/gs101-oriole.dts
@@ -53,6 +53,12 @@ button-power {
 			wakeup-source;
 		};
 	};
+
+	/* TODO: Remove this once PMIC is implemented  */
+	reg_placeholder: regulator-0 {
+		compatible = "regulator-fixed";
+		regulator-name = "placeholder_reg";
+	};
 };
 
 &ext_24_5m {
@@ -106,6 +112,24 @@ &serial_0 {
 	status = "okay";
 };
 
+&usbdrd31 {
+	status = "okay";
+	vdd10-supply = <&reg_placeholder>;
+	vdd33-supply = <&reg_placeholder>;
+};
+
+&usbdrd31_dwc3 {
+	dr_mode = "otg";
+	usb-role-switch;
+	role-switch-default-mode = "peripheral";
+	maximum-speed = "super-speed-plus";
+	status = "okay";
+};
+
+&usbdrd31_phy {
+	status = "okay";
+};
+
 &usi_uart {
 	samsung,clkreq-on; /* needed for UART mode */
 	status = "okay";

-- 
2.44.0.769.g3c40516874-goog