linux-kernel - Re: [PATCH 1/2] dt-bindings: msm/dsi: Add ref clock for 10nm PHY

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Message-ID: <20181114224252.GM22824@google.com>
Date:   Wed, 14 Nov 2018 14:42:52 -0800
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        Rob Clark <robdclark@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Archit Taneja <architt@...eaurora.org>,
        Sean Paul <seanpaul@...omium.org>,
        Rajesh Yadav <ryadav@...eaurora.org>,
        Douglas Anderson <dianders@...omium.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: msm/dsi: Add ref clock for 10nm PHY

On Tue, Nov 06, 2018 at 03:09:40PM -0800, Stephen Boyd wrote:
> Quoting Matthias Kaehlcke (2018-11-02 14:45:33)
> > Allow the 10nm PHY driver to get the ref clock from the DT.
> > 
> > Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> > ---
> >  Documentation/devicetree/bindings/display/msm/dsi.txt | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/display/msm/dsi.txt b/Documentation/devicetree/bindings/display/msm/dsi.txt
> > index dfc743219bd88..d0d2046ceff69 100644
> > --- a/Documentation/devicetree/bindings/display/msm/dsi.txt
> > +++ b/Documentation/devicetree/bindings/display/msm/dsi.txt
> > @@ -105,6 +105,10 @@ Required properties:
> >  - power-domains: Should be <&mmcc MDSS_GDSC>.
> >  - clocks: Phandles to device clocks. See [1] for details on clock bindings.
> >  - clock-names: the following clocks are required:
> > +  For 10nm PHY:
> > +  * "iface"
> > +  * "ref"
> > +  For other PHYs:
> >    * "iface"
> 
> Any reason we can't go back and do this for other phys too? They're all
> the same with regards to this reference clk input.

To avoid breaking existing users, at least the 28nm PHY is used by
msm8916. Also I don't have the hardware to test changes for other
PHYs.

Cheers

Matthias