linux-kernel - Re: [PATCH] Revert "dt-bindings: usb: mtk-xhci: Make all clocks required"

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Date:   Mon, 11 Jul 2022 08:34:43 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Collabora Kernel ML <kernel@...labora.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        devicetree@...r.kernel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Linux USB List <linux-usb@...r.kernel.org>
Subject: Re: [PATCH] Revert "dt-bindings: usb: mtk-xhci: Make all clocks required"

On Fri, Jul 8, 2022 at 1:26 PM Nícolas F. R. A. Prado
<nfraprado@...labora.com> wrote:
>
> This reverts commit ebc4969ae125e65fdb563f66f4bfa7aec95f7eb4. That
> commit was supposed to make the binding better reflect the MediaTek XHCI
> hardware block by requiring all clocks to be present. But doing that
> also causes too much noise in the devicetrees, since it requires
> updating old MediaTek DTs to add clock handles for the fixed clocks, and
> going forward every new clock added to the binding would require even
> more updates.
>
> The commit also didn't update the example to match the changes, causing
> additional warnings.
>
> Instead let's keep the clocks optional so that old devicetrees can keep
> omitting the fixed clocks, and we'll just add the clocks as required on
> new DTs.
>
> Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
>
> ---
>
>  Documentation/devicetree/bindings/usb/mediatek,mtk-xhci.yaml | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)

Acked-by: Rob Herring <robh@...nel.org>