linux-kernel - Re: [PATCH v5 1/7] dt-bindings: Add panel-timing subnode to simple-panel

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Date:   Mon, 8 Apr 2019 07:39:37 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Heiko Stuebner <heiko@...ech.de>,
        Sean Paul <seanpaul@...omium.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Enric Balletbò <enric.balletbo@...labora.com>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Eric Anholt <eric@...olt.net>,
        Jeffy Chen <jeffy.chen@...k-chips.com>,
        Stéphane Marchesin <marcheu@...omium.org>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH v5 1/7] dt-bindings: Add panel-timing subnode to simple-panel

Thierry,

On Mon, Apr 8, 2019 at 3:32 AM Thierry Reding <thierry.reding@...il.com> wrote:
>
> On Mon, Apr 01, 2019 at 10:17:18AM -0700, Douglas Anderson wrote:
> > From: Sean Paul <seanpaul@...omium.org>
> >
> > This patch adds a new subnode to simple-panel allowing us to override
> > the typical timing expressed in the panel's display_timing.
> >
> > Changes in v2:
> >  - Split out the binding into a new patch (Rob)
> >  - display-timings is a new section (Rob)
> >  - Use the full display-timings subnode instead of picking the timing
> >    out (Rob/Thierry)
> > Changes in v3:
> >  - Go back to using the timing subnode directly, but rename to
> >    panel-timing (Rob)
> > Changes in v4:
> >  - Simplify desc. for when override should be used (Thierry/Laurent)
> >  - Removed Rob H review since it's been a year and wording changed
> > Changes in v5:
> >  - Removed bit about OS may ignore (Rob/Ezequiel)
> >
> > Cc: Doug Anderson <dianders@...omium.org>
> > Cc: Eric Anholt <eric@...olt.net>
> > Cc: Heiko Stuebner <heiko@...ech.de>
> > Cc: Jeffy Chen <jeffy.chen@...k-chips.com>
> > Cc: Rob Herring <robh+dt@...nel.org>
> > Cc: Stéphane Marchesin <marcheu@...omium.org>
> > Cc: Thierry Reding <thierry.reding@...il.com>
> > Cc: devicetree@...r.kernel.org
> > Cc: dri-devel@...ts.freedesktop.org
> > Cc: linux-rockchip@...ts.infradead.org
> > Signed-off-by: Sean Paul <seanpaul@...omium.org>
> > Signed-off-by: Douglas Anderson <dianders@...omium.org>
> > ---
> >
> >  .../bindings/display/panel/simple-panel.txt   | 22 +++++++++++++++++++
> >  1 file changed, 22 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/display/panel/simple-panel.txt b/Documentation/devicetree/bindings/display/panel/simple-panel.txt
> > index b2b872c710f2..93882268c0b9 100644
> > --- a/Documentation/devicetree/bindings/display/panel/simple-panel.txt
> > +++ b/Documentation/devicetree/bindings/display/panel/simple-panel.txt
> > @@ -15,6 +15,16 @@ Optional properties:
> >    (hot plug detect) signal, but the signal isn't hooked up so we should
> >    hardcode the max delay from the panel spec when powering up the panel.
> >
> > +panel-timing subnode
>
> Is there any reason why we need the panel- prefix? This is already part
> of a panel definition, so it's completely redundant. Why not just name
> the subnode "timing"?

It was a really long time ago since this patch series was idle for a
while, but you previous had similar feedback in v3 but ended up OK
with it.  See:

https://patchwork.kernel.org/patch/10207583/

I believe the original node name came out of some back and forth
between Rob and Sean.  As far as I can tell, the context is back in
<https://patchwork.kernel.org/patch/10203483/>.  I think Rob wanted it
to follow other similar node names.


That all being said, if you feel strongly about it being called
"timing" and Rob's OK w/ that too then I'll re-spin the series.

-Doug