linux-kernel - Re: [PATCH v2 2/4] dt-bindings: usb: mtk-xhci: Make all clocks required

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Date:   Tue, 28 Jun 2022 08:57:45 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     "Nícolas F. R. A. Prado" <nfraprado@...labora.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, <kernel@...labora.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v2 2/4] dt-bindings: usb: mtk-xhci: Make all clocks
 required

Hi Nícolas,

On Thu, 2022-06-23 at 15:37 -0400, Nícolas F. R. A. Prado wrote:
> All of the clocks listed in the binding are always wired to the XHCI
> controller hardware blocks on all SoCs. The reason some clocks were
> made
> optional in the binding was to account for the fact that depending on
> the SoC, some of the clocks might be fixed (ie not controlled by
> software).
> 
> Given that the devicetree should represent the hardware, make all
> clocks
> required in the binding. Subsequent patches will make the DTS changes
> to
> specify fixed-clocks for the clocks that aren't controllable.
> 
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
> 
> ---
> 
> Changes in v2:
> - Undid clock list changes that allowed middle clocks to be missing
> from
>   v1 and made all clocks required instead
> - Rewrote commit message and title
> 
>  Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml | 4 +
> ---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/usb/mediatek,mtk-
> xhci.yaml b/Documentation/devicetree/bindings/usb/mediatek,mtk-
> xhci.yaml
> index 63cbc2b62d18..1444d18ef9bc 100644
> --- a/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
> +++ b/Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml
> @@ -67,7 +67,6 @@ properties:
>      maxItems: 1
>  
>    clocks:
> -    minItems: 1
>      items:
>        - description: Controller clock used by normal mode
>        - description: Reference clock used by low power mode etc
> @@ -76,9 +75,8 @@ properties:
>        - description: controller clock
>  
>    clock-names:
> -    minItems: 1
>      items:
> -      - const: sys_ck  # required, the following ones are optional
> +      - const: sys_ck
>        - const: ref_ck
>        - const: mcu_ck
>        - const: dma_ck

This patch causes more check warning, I prefer to leave dt-bindings
unchanged, but just fix mt8195's dts warning instead, thanks a lot