linux-kernel - [PATCH 2/3] arm64: dts: allwinner: h6: orangepi: Disable OTG mode

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Message-Id: <20200413062433.1145043-3-jernej.skrabec@siol.net>
Date:   Mon, 13 Apr 2020 08:24:32 +0200
From:   Jernej Skrabec <jernej.skrabec@...l.net>
To:     mripard@...nel.org, wens@...e.org
Cc:     robh+dt@...nel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: [PATCH 2/3] arm64: dts: allwinner: h6: orangepi: Disable OTG mode

As can be seen from OrangePi Lite 2 and One Plus schematics, VBUS pin on
USB OTG port is directly connected to 5 V power supply. This mean that
OTG port can safely operate only in host mode, even though these two
boards have ID pin connected.

Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
---
 arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi.dtsi | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi.dtsi
index f1be3dd558ca..ebc120a9232f 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-h6-orangepi.dtsi
@@ -251,7 +251,12 @@ &uart0 {
 };
 
 &usb2otg {
-	dr_mode = "otg";
+	/*
+	 * OrangePi Lite 2 and One Plus, where this DT is used, don't
+	 * have a controllable VBUS even though they do have an ID pin.
+	 * Using it as anything but a USB host is unsafe.
+	 */
+	dr_mode = "host";
 	status = "okay";
 };
 
-- 
2.26.0