linux-kernel - Re: [PATCH 1/2] dt-bindings: usb: mediatek,mtk-xhci: add keep-clock-on

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Date:   Wed, 4 Nov 2020 16:39:26 -0600
From:   Rob Herring <robh@...nel.org>
To:     Macpaul Lin <macpaul.lin@...iatek.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Ainge Hsu <ainge.hsu@...iatek.com>,
        Eddie Hung <eddie.hung@...iatek.com>,
        Mediatek WSD Upstream <wsd_upstream@...iatek.com>,
        Macpaul Lin <macpaul@...il.com>
Subject: Re: [PATCH 1/2] dt-bindings: usb: mediatek,mtk-xhci: add
 keep-clock-on

On Mon, Nov 02, 2020 at 03:18:48PM +0800, Macpaul Lin wrote:
> Option "mediatek,keep-clock-on" means to keep clock on during system
> suspend and resume. Some platform will flush register settings if clock has
> been disabled when system is suspended. Set this option to avoid clock off.
> 
> Signed-off-by: Macpaul Lin <macpaul.lin@...iatek.com>
> ---
>  .../devicetree/bindings/usb/mediatek,mtk-xhci.yaml |    7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
> index ea696c8..a956dde 100644
> --- a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
> +++ b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
> @@ -104,6 +104,12 @@ properties:
>      description: enable USB remote wakeup, see power/wakeup-source.txt
>      type: boolean
>  
> +  mediatek,keep-clock-on:
> +    description: |
> +      Keep clock on during system suspend and resume. Some platform will flush
> +      register settings if clock has been disabled when system is suspended.
> +    type: boolean
> +

This should be implied by the compatible string.

>    mediatek,syscon-wakeup:
>      $ref: /schemas/types.yaml#/definitions/phandle-array
>      maxItems: 1
> @@ -175,6 +181,7 @@ examples:
>          imod-interval-ns = <10000>;
>          mediatek,syscon-wakeup = <&pericfg 0x400 1>;
>          wakeup-source;
> +        mediatek,keep-clock-on;
>          usb3-lpm-capable;
>      };
>  ...
> -- 
> 1.7.9.5