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

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Date:   Fri, 25 Mar 2022 13:41:18 +0000
From:   "Sankeerth Billakanti (QUIC)" <quic_sbillaka@...cinc.com>
To:     Doug Anderson <dianders@...omium.org>,
        "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



> -----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?

> > +&mdss_edp {
> > +       status = "okay";
> > +
> > +       data-lanes = <0 1 2 3>;
> > +       vdda-1p2-supply = <&vreg_l6b_1p2>;
> > +       vdda-0p9-supply = <&vreg_l10c_0p8>;
> > +
> > +       aux-bus {
> > +               edp_panel: edp-panel {
> 
> As Stephen pointed out, it should be called "panel".

Okay. Will make that change