linux-kernel - RE: [PATCH v5 3/9] arm64: dts: qcom: sc7280: Enable backlight for eDP panel

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Message-ID: <MW4PR02MB71864E9A6E13A9E7F2C1686BE11A9@MW4PR02MB7186.namprd02.prod.outlook.com>
Date:   Fri, 25 Mar 2022 13:34:40 +0000
From:   "Sankeerth Billakanti (QUIC)" <quic_sbillaka@...cinc.com>
To:     Stephen Boyd <swboyd@...omium.org>,
        "Sankeerth Billakanti (QUIC)" <quic_sbillaka@...cinc.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "freedreno@...ts.freedesktop.org" <freedreno@...ts.freedesktop.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "robdclark@...il.com" <robdclark@...il.com>,
        "seanpaul@...omium.org" <seanpaul@...omium.org>,
        quic_kalyant <quic_kalyant@...cinc.com>,
        "Abhinav Kumar (QUIC)" <quic_abhinavk@...cinc.com>,
        "dianders@...omium.org" <dianders@...omium.org>,
        "Kuogee Hsieh (QUIC)" <quic_khsieh@...cinc.com>,
        "agross@...nel.org" <agross@...nel.org>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzk+dt@...nel.org" <krzk+dt@...nel.org>,
        "sean@...rly.run" <sean@...rly.run>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "sam@...nborg.org" <sam@...nborg.org>,
        "dmitry.baryshkov@...aro.org" <dmitry.baryshkov@...aro.org>,
        quic_vproddut <quic_vproddut@...cinc.com>
Subject: RE: [PATCH v5 3/9] arm64: dts: qcom: sc7280: Enable backlight for eDP
 panel



> -----Original Message-----
> From: Stephen Boyd <swboyd@...omium.org>
> Sent: Friday, March 18, 2022 2:58 AM
> To: Sankeerth Billakanti (QUIC) <quic_sbillaka@...cinc.com>;
> devicetree@...r.kernel.org; dri-devel@...ts.freedesktop.org;
> freedreno@...ts.freedesktop.org; linux-arm-msm@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Cc: robdclark@...il.com; seanpaul@...omium.org; quic_kalyant
> <quic_kalyant@...cinc.com>; Abhinav Kumar (QUIC)
> <quic_abhinavk@...cinc.com>; dianders@...omium.org; Kuogee Hsieh
> (QUIC) <quic_khsieh@...cinc.com>; agross@...nel.org;
> bjorn.andersson@...aro.org; robh+dt@...nel.org; krzk+dt@...nel.org;
> sean@...rly.run; airlied@...ux.ie; daniel@...ll.ch;
> thierry.reding@...il.com; sam@...nborg.org;
> dmitry.baryshkov@...aro.org; quic_vproddut <quic_vproddut@...cinc.com>
> Subject: Re: [PATCH v5 3/9] arm64: dts: qcom: sc7280: Enable backlight for
> eDP panel
> 
> Quoting Sankeerth Billakanti (2022-03-16 10:35:48)
> > Enable backlight support for eDP panel on CRD platform for sc7280.
> >
> > Signed-off-by: Sankeerth Billakanti <quic_sbillaka@...cinc.com>
> > ---
> >
> > Changes in v5:
> >   - Separate out backlight nodes
> >
> >  arch/arm64/boot/dts/qcom/sc7280-crd.dts | 18 ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/qcom/sc7280-crd.dts
> > b/arch/arm64/boot/dts/qcom/sc7280-crd.dts
> > index 2df654e..16d1a5b 100644
> > --- a/arch/arm64/boot/dts/qcom/sc7280-crd.dts
> > +++ b/arch/arm64/boot/dts/qcom/sc7280-crd.dts
> > @@ -37,6 +37,15 @@
> >                 pinctrl-0 = <&edp_panel_power>;
> >         };
> >
> > +       edp_backlight: edp-backlight {
> 
> Does this also move to qcard.dtsi? Why can't this be combined with the
> previous patch?
> 
The nodes related to pwm are dependent on
https://patchwork.kernel.org/project/linux-arm-msm/list/?series=620127&state=*

We moved them to different patch so that the other patch can be merged without depending on above series. I will rearrange to get backlight definitions also here.

> > +               compatible = "pwm-backlight";
> > +
> > +               power-supply = <&vreg_edp_bp>;
> > +               pwms = <&pm8350c_pwm 3 65535>;
> > +
> > +               enable-gpios = <&pm8350c_gpios 7 GPIO_ACTIVE_HIGH>;
> > +       };
> > +
> >         vreg_edp_bp: vreg-edp-bp-regulator {
> >                 compatible = "regulator-fixed";
> >                 regulator-name = "vreg_edp_bp"; @@ -123,7 +132,9 @@
> > ap_ts_pen_1v8: &i2c13 {
> >                 edp_panel: edp-panel {
> >                         compatible = "edp-panel";
> >
> > +                       backlight = <&edp_backlight>;
> >                         power-supply = <&edp_3v3_regulator>;
> > +
> 
> Nitpick: Remove this newline from this hunk and put it in when power-supply
> is introduced.
> 

Okay, will make that change.

> >                         ports {
> >                                 #address-cells = <1>;
> >                                 #size-cells = <0>; @@ -172,6 +183,13
> > @@ ap_ts_pen_1v8: &i2c13 {
> >         };
> >  };
> >
> > +&pm8350c_pwm {
> > +       status = "okay";
> > +
> > +       pinctrl-names = "default";
> > +       pinctrl-0 = <&edp_bl_pwm>;
> 
> I see the pinctrl is used now but it would be easier to review this patch if the
> pinctrl was in this patch.

Okay. I will rearrange the hunks from this and the previous patch.