linux-kernel - [PATCH] ARM: dts: imx51-zii-rdu1: limit usbh1 to full-speed

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Message-Id: <20180515084502.17148-1-nikita.yoush@cogentembedded.com>
Date:   Tue, 15 May 2018 11:45:02 +0300
From:   Nikita Yushchenko <nikita.yoush@...entembedded.com>
To:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Chris Healy <cphealy@...il.com>,
        Andrey Smirnov <andrew.smirnov@...il.com>,
        Marco Franchi <marcofrk@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Nikita Yushchenko <nikita.yoush@...entembedded.com>
Subject: [PATCH] ARM: dts: imx51-zii-rdu1: limit usbh1 to full-speed

On RDU1, imx51 usbh1 interface is either not used, or used via external
block that breaks USB2 signalling.

To keep things working if high-speed device gets connected to that
block, use ChipIdea feature to limit port to full speed.

Signed-off-by: Nikita Yushchenko <nikita.yoush@...entembedded.com>
---
 arch/arm/boot/dts/imx51-zii-rdu1.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/imx51-zii-rdu1.dts b/arch/arm/boot/dts/imx51-zii-rdu1.dts
index 36a63ae52e48..c26f053f29b0 100644
--- a/arch/arm/boot/dts/imx51-zii-rdu1.dts
+++ b/arch/arm/boot/dts/imx51-zii-rdu1.dts
@@ -603,6 +603,7 @@
 	phy_type = "ulpi";
 	fsl,usbphy = <&usbh1phy>;
 	disable-over-current;
+	maximum-speed = "full-speed";
 	vbus-supply = <&reg_5p0v_main>;
 	status = "okay";
 };
-- 
2.11.0