linux-kernel - Re: [PATCH v2 2/7] drm/msm/dsi: 14nm PHY: Get ref clock from the DT

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Message-ID: <20181130221857.GC22824@google.com>
Date:   Fri, 30 Nov 2018 14:18:57 -0800
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Doug Anderson <dianders@...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 2/7] drm/msm/dsi: 14nm PHY: Get ref clock from the DT

On Tue, Nov 27, 2018 at 09:56:46PM -0800, Doug Anderson wrote:
> Hi,
> 
> On Mon, Nov 26, 2018 at 3:12 PM Matthias Kaehlcke <mka@...omium.org> wrote:
> >
> > Get the ref clock of the PHY from the device tree instead of
> > hardcoding its name and rate.
> 
> In the case of the 14nm PHY I think it's OK that you break
> compatibility with old device tree files (as this patch does) since
> the 14nm support was added sorta recently and "git grep" shows no
> users in linuxnext.  You should note that you're breaking
> compatibility with old DTS files in the commit message here so that if
> someone crawls out of the woodwork it will be easy for them to
> understand what happened.

ok, I'll add the note

> > +       pll_14nm->vco_ref_clk = devm_clk_get(&pdev->dev, "ref");
> > +       if (IS_ERR(pll_14nm->vco_ref_clk)) {
> > +               ret = PTR_ERR(pll_14nm->vco_ref_clk);
> > +               if (ret != EPROBE_DEFER)
> 
> Shouldn't this check against -EPROBE_DEFER, not against EPROBE_DEFER?
> It's negative.  Presumably this same feedback needs to be applied to
> the whole patch series.

You are right, will fix it throughout the series, thanks!

> Other than that this looks good to me and you can feel free to add my
> Reviewed-by tag FWIW.

Great, thanks for the review!

Matthias