linux-kernel - Re: [PATCH v3 0/2] Use "ref" clocks from firmware for DSI PLL VCO parent

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Message-ID: <20210918144038.6q352hzqopx7vvdu@SoMainline.org>
Date:   Sat, 18 Sep 2021 16:40:38 +0200
From:   Marijn Suijten <marijn.suijten@...ainline.org>
To:     Stephen Boyd <sboyd@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark <robdclark@...omium.org>
Cc:     phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        Matthias Kaehlcke <mka@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org
Subject: Re: [PATCH v3 0/2] Use "ref" clocks from firmware for DSI PLL VCO
 parent

On 2021-09-14 14:44:01, Stephen Boyd wrote:
> Quoting Marijn Suijten (2021-09-11 06:19:19)
> > All DSI PHY/PLL drivers were referencing their VCO parent clock by a
> > global name, most of which don't exist or have been renamed.  These
> > clock drivers seem to function fine without that except the 14nm driver
> > for sdm6xx [1].
> > 
> > At the same time all DTs provide a "ref" clock as per the requirements
> > of dsi-phy-common.yaml, but the clock is never used.  This patchset puts
> > that clock to use without relying on a global clock name, so that all
> > dependencies are explicitly defined in DT (the firmware) in the end.
> 
> I can take this through clk tree if it helps avoid conflicts. There are
> some other patches to sdm660.c in the clk tree already.

Might be useful to maintain proper ordering of these dependent patches
but it's up to Dmitry and Rob to decide, whom I'm sending this mail
directly to so that they can chime in.