linux-kernel - Re: [PATCH v6 1/5] dt-bindings:drm/bridge:anx7625:add vendor define flags

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Message-ID: <CAG3jFyt8EigCBkZHXgy1E-XcfpfdC5FEWW4Gb8bZqMT1tFW3ow@mail.gmail.com>
Date:   Thu, 1 Apr 2021 14:33:47 +0200
From:   Robert Foss <robert.foss@...aro.org>
To:     Xin Ji <xji@...logixsemi.com>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Rob Herring <robh+dt@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Nicolas Boichat <drinkcat@...gle.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Sam Ravnborg <sam@...nborg.org>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Maxime Ripard <mripard@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Ricardo Cañuelo <ricardo.canuelo@...labora.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Bernie Liang <bliang@...logixsemi.com>,
        Sheng Pan <span@...logixsemi.com>,
        Zhen Li <zhenli@...logixsemi.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 1/5] dt-bindings:drm/bridge:anx7625:add vendor define flags

Hey Xin,

This series no longer applies to drm-misc/drm-misc-next, please rebase it.

On Wed, 24 Mar 2021 at 08:52, Xin Ji <xji@...logixsemi.com> wrote:
>
> On Sun, Mar 21, 2021 at 02:00:38PM +0200, Laurent Pinchart wrote:
> > Hi Xin,
> >
> > Thank you for the patch.
> >
> > On Fri, Mar 19, 2021 at 02:32:39PM +0800, Xin Ji wrote:
> > > Add 'bus-type' and 'data-lanes' define for port0. Define DP tx lane0,
> > > lane1 swing register array define, and audio enable flag.
> > >
> > > Signed-off-by: Xin Ji <xji@...logixsemi.com>
> > > ---
> > >  .../display/bridge/analogix,anx7625.yaml      | 58 ++++++++++++++++++-
> > >  1 file changed, 57 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml b/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
> > > index c789784efe30..3f54d5876982 100644
> > > --- a/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
> > > +++ b/Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
> > > @@ -34,6 +34,26 @@ properties:
> > >      description: used for reset chip control, RESET_N pin B7.
> > >      maxItems: 1
> > >
> > > +  analogix,lane0-swing:
> > > +    $ref: /schemas/types.yaml#/definitions/uint32-array
> > > +    minItems: 1
> > > +    maxItems: 20
> > > +    description:
> > > +      an array of swing register setting for DP tx lane0 PHY, please don't
> > > +      add this property, or contact vendor.
> >
> > DT properties need to be documented. Contacting the vendor doesn't count
> > as documentation I'm afraid.
>
> Hi Laurent Pinchart, thanks for your comment. For the DP phy swing
> setting, it is hard to describe in here, needs to refer the anx7625
> datasheet and programming guide. Basically, no need to change the DP phy
> swing setting.
>

Laurent is right. But if the value practically is a constant, you can
move the swing register into the driver. It should still be documented
as well as possible, but we can be a little bit more flexible.

> > > @@ -73,6 +123,10 @@ examples:
> > >              enable-gpios = <&pio 45 GPIO_ACTIVE_HIGH>;
> > >              reset-gpios = <&pio 73 GPIO_ACTIVE_HIGH>;
> > >
> > > +            analogix,audio-enable;
> > > +            analogix,lane0-swing = <0x14 0x54 0x64 0x74 0x29 0x7b 0x77 0x5b>;
> > > +            analogix,lane1-swing = <0x14 0x54 0x64 0x74 0x29 0x7b 0x77 0x5b>;
> > > +
> > >              ports {
> > >                  #address-cells = <1>;
> > >                  #size-cells = <0>;