linux-kernel - Re: [PATCH v5 2/9] arm64: dts: qcom: sc7280: Add support for eDP panel on CRD

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Message-ID: <CAD=FV=VWaMx9UsXTktjd3Ryo3g0-XY2N9oCNz_kQoJN6gzKAoA@mail.gmail.com>
Date:   Fri, 25 Mar 2022 06:44:33 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     "Sankeerth Billakanti (QUIC)" <quic_sbillaka@...cinc.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Rob Clark <robdclark@...il.com>,
        Sean Paul <seanpaul@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        quic_kalyant <quic_kalyant@...cinc.com>,
        "Abhinav Kumar (QUIC)" <quic_abhinavk@...cinc.com>,
        "Kuogee Hsieh (QUIC)" <quic_khsieh@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        "krzk+dt@...nel.org" <krzk+dt@...nel.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        "dmitry.baryshkov@...aro.org" <dmitry.baryshkov@...aro.org>,
        quic_vproddut <quic_vproddut@...cinc.com>
Subject: Re: [PATCH v5 2/9] arm64: dts: qcom: sc7280: Add support for eDP
 panel on CRD

Hi,

On Fri, Mar 25, 2022 at 6:41 AM Sankeerth Billakanti (QUIC)
<quic_sbillaka@...cinc.com> wrote:
>
> > -----Original Message-----
> > From: Doug Anderson <dianders@...omium.org>
> > Sent: Friday, March 18, 2022 10:51 PM
> > To: Sankeerth Billakanti (QUIC) <quic_sbillaka@...cinc.com>
> > Cc: dri-devel <dri-devel@...ts.freedesktop.org>; linux-arm-msm <linux-arm-
> > msm@...r.kernel.org>; freedreno <freedreno@...ts.freedesktop.org>;
> > LKML <linux-kernel@...r.kernel.org>; open list:OPEN FIRMWARE AND
> > FLATTENED DEVICE TREE BINDINGS <devicetree@...r.kernel.org>; Rob Clark
> > <robdclark@...il.com>; Sean Paul <seanpaul@...omium.org>; Stephen
> > Boyd <swboyd@...omium.org>; quic_kalyant <quic_kalyant@...cinc.com>;
> > Abhinav Kumar (QUIC) <quic_abhinavk@...cinc.com>; Kuogee Hsieh (QUIC)
> > <quic_khsieh@...cinc.com>; Andy Gross <agross@...nel.org>;
> > bjorn.andersson@...aro.org; Rob Herring <robh+dt@...nel.org>;
> > krzk+dt@...nel.org; Sean Paul <sean@...rly.run>; David Airlie
> > <airlied@...ux.ie>; Daniel Vetter <daniel@...ll.ch>; Thierry Reding
> > <thierry.reding@...il.com>; Sam Ravnborg <sam@...nborg.org>;
> > dmitry.baryshkov@...aro.org; quic_vproddut <quic_vproddut@...cinc.com>
> > Subject: Re: [PATCH v5 2/9] arm64: dts: qcom: sc7280: Add support for eDP
> > panel on CRD
> >
> > Hi,
> >
> > On Wed, Mar 16, 2022 at 10:36 AM Sankeerth Billakanti
> > <quic_sbillaka@...cinc.com> wrote:
> > >
> > > Enable support for eDP interface via aux_bus on CRD platform.
> > >
> > > Signed-off-by: Sankeerth Billakanti <quic_sbillaka@...cinc.com>
> > > ---
> > >
> > > Changes in v5:
> > >   - Change the order of patches
> > >   - Remove the backlight nodes
> > >   - Remove the bias setting
> > >   - Fix compilation issue
> > >   - Model VREG_EDP_BP for backlight power
> > >
> > > Changes in v4:
> > >   - Create new patch for name changes
> > >   - Remove output-low
> > >
> > > Changes in v3:
> > >   - Sort the nodes alphabetically
> > >   - Use - instead of _ as node names
> > >   - Place the backlight and panel nodes under root
> > >   - Change the name of edp_out to mdss_edp_out
> > >   - Change the names of regulator nodes
> > >   - Delete unused properties in the board file
> > >
> > >
> > > Changes in v2:
> > >   - Sort node references alphabetically
> > >   - Improve readability
> > >   - Move the pwm pinctrl to pwm node
> > >   - Move the regulators to root
> > >   - Define backlight power
> > >   - Remove dummy regulator node
> > >   - Cleanup pinctrl definitions
> > >
> > >  arch/arm64/boot/dts/qcom/sc7280-crd.dts | 93
> > > +++++++++++++++++++++++++++++++++
> > >  1 file changed, 93 insertions(+)
> >
> > At a high level, I'd expect your patch to be based upon Matthias's series, AKA
> > the 4 patches from:
> >
> > https://lore.kernel.org/r/20220316172814.v1.1.I2deda8f2cd6adfbb525a97d8f
> > ee008a8477b7b0e@...ngeid/
> >
> > I'll leave it up to you about whether you care to support eDP on the old
> > CRD1/2 or just on CRD3. Personally I'd think CRD3 would be enough.
> >
> > Then, I'd expect your patch to mostly incorporate
> > <https://crrev.com/c/3379844>, though that patch was written before aux-
> > bus support so the panel would need to go in a different place.
> >
> > Stephen already gave some comments and basing on Matthias's patches will
> > be a pretty big change, so I probably won't comment lots more.
> >
> >
>
> I rebased my change on top of Matthias's changes now. We are discussing about the qcard changes internally to understand the way ahead.
> I believe all my current changes are localized to the crd-r3 files only for the qyalcomm crd3.1
>
> I want to have a different series for c and dt changes to expedite review process. May I separate the c changes from this series?

I'd have no problems with that. They go into different trees and if it
makes it easier to get a new version of the driver out while you're
figuring out what to do about the dts then I'd say let's do it.

-Doug