linux-kernel - Re: [PATCH v2 1/7] dt-bindings: msm/dsi: Add ref clock for PHYs

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Message-ID: <CAD=FV=WvXFpZDJGbdvvY=HL_=tDWyhKpTg7zu8s=gUuJgK1ebg@mail.gmail.com>
Date:   Tue, 27 Nov 2018 21:41:39 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Rob Clark <robdclark@...il.com>, David Airlie <airlied@...ux.ie>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Archit Taneja <architt@...eaurora.org>,
        Sean Paul <seanpaul@...omium.org>,
        Rajesh Yadav <ryadav@...eaurora.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Jeykumar Sankaran <jsanka@...eaurora.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/7] dt-bindings: msm/dsi: Add ref clock for PHYs

Hi,

On Mon, Nov 26, 2018 at 3:12 PM Matthias Kaehlcke <mka@...omium.org> wrote:
>
> Allow the PHY drivers to get the ref clock from the DT.
>
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
> Changes in v2:
> - add the ref clock for all PHYs, not only the 10nm one
> - updated commit message
> ---
>  Documentation/devicetree/bindings/display/msm/dsi.txt | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/Documentation/devicetree/bindings/display/msm/dsi.txt b/Documentation/devicetree/bindings/display/msm/dsi.txt
> index dfc743219bd88..b0485559a719c 100644
> --- a/Documentation/devicetree/bindings/display/msm/dsi.txt
> +++ b/Documentation/devicetree/bindings/display/msm/dsi.txt
> @@ -106,6 +106,7 @@ Required properties:
>  - clocks: Phandles to device clocks. See [1] for details on clock bindings.
>  - clock-names: the following clocks are required:
>    * "iface"
> +  * "ref"

We can't quite make ref "required" because there are some old device
tree files dating back to 2016 that would be broken.  It could be
listed as optional, but I _think_ Rob is OK with it being listed as
"required" for all new device tree files with the footnote that if
it's not present then the code will still work.