linux-kernel - Re: [PATCH v2 1/2] drm/msm/dsi: Use "ref" fw clock instead of global name for VCO parent

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Date:   Tue, 31 Aug 2021 22:35:12 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-arm-msm@...r.kernel.org, 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>,
        Pavel Dubrova <pashadubrova@...il.com>,
        Andy Gross <agross@...nel.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-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        Stephen Boyd <swboyd@...omium.org>
Subject: Re: [PATCH v2 1/2] drm/msm/dsi: Use "ref" fw clock instead of global name for VCO parent

Quoting Marijn Suijten (2021-08-30 16:10:26)
> 
> I'm 95% sure this shouldn't cause any problems given current DTs and
> their history, but that's probably not enough.  This might also impact
> DTs that have not yet been upstreamed, but afaik the general stance is
> to not care and actually serve as a fair hint/warning before new DTs
> make it to the list.
> 
> If there is a protocol in place to deprecate, warn, and eventually
> remove this reliance on global clock names I'm more than happy to add
> .name as a temporary fallback, even if likely unneeded.  Otherwise we
> might never get rid of it.

I'm not aware of any protocol to deprecate, warn, and remove the
fallback name. It's a fallback because it can't ever really be removed.

Anyway, if you're not willing to add the .name then that's fine. We can
deal with the problem easily by adding a .name in the future if someone
complains that things aren't working. Sound like a plan? If so, it's
probably good to add some sort of note in the commit text so that when
the bisector lands on this patch they can realize that this
intentionally broke them.