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

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Message-ID: <1507703854.17567.77.camel@mhfsdcap03>
Date:   Wed, 11 Oct 2017 14:37:34 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Rob Herring <robh@...nel.org>
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 Thu, 2017-10-05 at 17:16 -0500, Rob Herring wrote:
Hi,
> 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.
I find only one common binding document about USB bus, that is
bindings/usb/usb-device.txt, but it can't be used to disable some ports,
because in hub_probe() function, hub driver enables all downstream
ports, but doesn't get any property info from DTS.

> 
> >   - 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
> >