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

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Message-ID: <1526374356.3494.14.camel@pengutronix.de>
Date:   Tue, 15 May 2018 10:52:36 +0200
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Nikita Yushchenko <nikita.yoush@...entembedded.com>,
        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>,
        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
Subject: Re: [PATCH] ARM: dts: imx51-zii-rdu1: limit usbh1 to full-speed

Am Dienstag, den 15.05.2018, 11:45 +0300 schrieb Nikita Yushchenko:
> 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>

Reviewed-by: Lucas Stach <l.stach@...gutronix.de>

> ---
>  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";
>  };