linux-kernel - Re: [PATCH 10/12] dt-bindings: usb: mtu3: add a optional property to disable u3ports

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Date:   Mon, 9 Oct 2017 10:43:47 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Rob Herring <robh@...nel.org>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Mathias Nyman <mathias.nyman@...el.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 10/12] dt-bindings: usb: mtu3: add a optional property
 to disable u3ports

On Thu, 2017-10-05 at 17:31 -0500, Rob Herring wrote:
> On Thu, Sep 28, 2017 at 08:17:18AM +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,mtu3.txt      |    2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtu3.txt b/Documentation/devicetree/bindings/usb/mediatek,mtu3.txt
> > index 49f5476..7c611d1 100644
> > --- a/Documentation/devicetree/bindings/usb/mediatek,mtu3.txt
> > +++ b/Documentation/devicetree/bindings/usb/mediatek,mtu3.txt
> > @@ -44,6 +44,8 @@ Optional properties:
> >   - mediatek,enable-wakeup : supports ip sleep wakeup used by host mode
> >   - mediatek,syscon-wakeup : phandle to syscon used to access USB wakeup
> >  	control register, it depends on "mediatek,enable-wakeup".
> > + - mediatek,u3p-dis-msk : mask to disable u3ports, bit0 for u3port0,
> > +	bit1 for u3port1, ... etc;
> 
> How does this relate to the XHCI change? Same comment applies.

There is a upper layer called IPPC (IP Power and Clock interface) shared
by device IP and host IP (xHCI) to control power and clock of each port.
So I can disable or enable xCHI's ports by IPPC indirectly.