linux-kernel - Re: [PATCH 8/9] dt-bindings: usb: mtk-xhci: add a optional property to disable u3ports

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Message-ID: <20171005221650.yfyh72op6azm2nri@rob-hp-laptop>
Date:   Thu, 5 Oct 2017 17:16:50 -0500
From:   Rob Herring <robh@...nel.org>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-usb@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 8/9] dt-bindings: usb: mtk-xhci: add a optional property
 to disable u3ports

On Wed, Sep 27, 2017 at 05:23:04PM +0800, Chunfeng Yun wrote:
> Add a new optional property to disable u3ports
> 
> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> ---
>  .../devicetree/bindings/usb/mediatek,mtk-xhci.txt  |    2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
> index 5611a2e..2d9b459 100644
> --- a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
> +++ b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.txt
> @@ -38,6 +38,8 @@ Optional properties:
>  	mode;
>   - mediatek,syscon-wakeup : phandle to syscon used to access USB wakeup
>  	control register, it depends on "mediatek,wakeup-src".
> + - mediatek,u3p-dis-msk : mask to disable u3ports, bit0 for u3port0,
> +	bit1 for u3port1, ... etc;

I think you should have child nodes for ports and use "status" to 
disable them (or omit them). IIRC, the common USB bus binding already 
defines ports.

>   - vbus-supply : reference to the VBUS regulator;
>   - usb3-lpm-capable : supports USB3.0 LPM
>   - pinctrl-names : a pinctrl state named "default" must be defined
> -- 
> 1.7.9.5
>