linux-kernel - [PATCH 3/3] ARM: dts: imx6: rdu2: Limit USBH1 to Full Speed

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Message-Id: <20190529071843.24767-3-andrew.smirnov@gmail.com>
Date:   Wed, 29 May 2019 00:18:43 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Chris Healy <cphealy@...il.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] ARM: dts: imx6: rdu2: Limit USBH1 to Full Speed

Cabling used to connect devices to USBH1 on RDU2 does not meet USB
spec cable quality and cable length requirements to operate at High
Speed, so limit the port to Full Speed only.

Reported-by: Chris Healy <cphealy@...il.com>
Reviewed-by: Chris Healy <cphealy@...il.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
Cc: Shawn Guo <shawnguo@...nel.org>
Cc: Fabio Estevam <festevam@...il.com>
Cc: Lucas Stach <l.stach@...gutronix.de>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
---
 arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi b/arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi
index 04d4d4d7e43c..e1d8478884f9 100644
--- a/arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-zii-rdu2.dtsi
@@ -805,6 +805,7 @@
 &usbh1 {
 	vbus-supply = <&reg_5p0v_main>;
 	disable-over-current;
+	maximum-speed = "full-speed";
 	status = "okay";
 };
 
-- 
2.21.0