linux-kernel - Re: [PATCH 02/11] dt-bindings: usb: mtk-xhci: add optional property to disable usb2 ports

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Date:   Wed, 11 Aug 2021 08:12:46 +0000
From:   Chunfeng Yun (云春峰) 
        <Chunfeng.Yun@...iatek.com>
To:     "robh@...nel.org" <robh@...nel.org>
CC:     "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "mathias.nyman@...el.com" <mathias.nyman@...el.com>,
        Eddie Hung (洪正鑫) 
        <Eddie.Hung@...iatek.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>
Subject: Re: [PATCH 02/11] dt-bindings: usb: mtk-xhci: add optional property
 to disable usb2 ports

On Fri, 2021-08-06 at 14:41 -0600, Rob Herring wrote:
> On Fri, Jul 30, 2021 at 04:49:53PM +0800, Chunfeng Yun wrote:
> > Add support to disable specific usb2 host ports, it's useful when
> > a usb2 port is disabled on some platforms, but enabled on others
> > for
> > the same SoC, another case is that the different package may
> > support
> > different number of ports.
> > 
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> > ---
> >  Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml | 5
> > +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtk-
> > xhci.yaml b/Documentation/devicetree/bindings/usb/mediatek,mtk-
> > xhci.yaml
> > index 49729aab6d1a..61a0e550b5d6 100644
> > --- a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
> > +++ b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
> > @@ -154,6 +154,11 @@ properties:
> >      description: The mask to disable u3ports, bit0 for u3port0,
> >        bit1 for u3port1, ... etc
> >  
> > +  mediatek,u2p-dis-msk:
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    description: The mask to disable u2ports, bit0 for u2port0,
> > +      bit1 for u2port1, ... etc
> 
> You already have this property in the parent node, right? Why are we 
> duplicating it in both places?
Some SoC may only support xHCI controller, then only use mtk-xhci node
without parent mtu3 node which is used for dual-role controller.
it's mainly for backward compatible.

Thanks a lot

> 
> Rob