linux-kernel - Re: [PATCH 1/4] dt-bindings: usb: mtk-xhci: add support 'resets' property

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Message-ID: <45e49226ddbe44a5205f015c4c80e49239c5d9aa.camel@mediatek.com>
Date:   Tue, 24 May 2022 11:02:43 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Rex-BC Chen <rex-bc.chen@...iatek.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        <linux-usb@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Eddie Hung <eddie.hung@...iatek.com>
Subject: Re: [PATCH 1/4] dt-bindings: usb: mtk-xhci: add support 'resets'
 property

Hi Rex-BC,

On Mon, 2022-05-23 at 18:41 +0800, Rex-BC Chen wrote:
> On Mon, 2022-05-23 at 17:04 +0800, Chunfeng Yun wrote:
> > Add 'resets' property to support IP reset usually by top pericfg.
> > 
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> > ---
> >  Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml | 3
> > +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtk-
> > xhci.yaml b/Documentation/devicetree/bindings/usb/mediatek,mtk-
> > xhci.yaml
> > index 084d7135b2d9..892718459d25 100644
> > --- a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
> > +++ b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
> > @@ -113,6 +113,9 @@ properties:
> >    vbus-supply:
> >      description: Regulator of USB VBUS5v
> >  
> > +  resets:
> > +    maxItems: 1
> > +
> >    usb3-lpm-capable: true
> >  
> >    usb2-lpm-disable: true
> 
> Hello Chunfeng,
> 
> Which soc we will use this reset?
This is common for all SoCs, can use it if there is a reset controller
driver supported.

> I am upstreaming another series for system clock reset.
That's good
> I think you should add how to use for this series base on [1].
Currently I test it on mt8195 based on ti-syscon reset driver, luckly
this is transparent for our usb controller drivers;

I could add patches to use this 'resets' property on mt8195/8186 if the
below series are applied.

Thanks

> 
> [1]: 
> 
https://lore.kernel.org/linux-clk/5067ec46-7a82-6b7b-5b07-3102cfaefbf6@collabora.com/T/#m5b6abb9bd2109e4ed9a1a3eeee6e7976892cb8c2
> 
> BRs,
> Rex
>