linux-kernel - Re: [PATCH v1 1/2] dt-bindings: display: bridge: sn65dsi83: Add DSI video mode

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Message-ID: <ZCWkdc+x0LXDSohj@francesco-nb.int.toradex.com>
Date:   Thu, 30 Mar 2023 17:02:13 +0200
From:   Francesco Dolcini <francesco@...cini.it>
To:     Jagan Teki <jagan@...rulasolutions.com>
Cc:     Francesco Dolcini <francesco@...cini.it>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        dri-devel@...ts.freedesktop.org, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Marek Vasut <marex@...x.de>, devicetree@...r.kernel.org,
        Francesco Dolcini <francesco.dolcini@...adex.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] dt-bindings: display: bridge: sn65dsi83: Add DSI
 video mode

On Thu, Mar 30, 2023 at 07:56:26PM +0530, Jagan Teki wrote:
> On Thu, Mar 30, 2023 at 3:48 PM Francesco Dolcini <francesco@...cini.it> wrote:
> >
> > From: Francesco Dolcini <francesco.dolcini@...adex.com>
> >
> > SN65DSI8[34] device supports burst video mode and non-burst video mode
> > with sync events or with sync pulses packet transmission as described in
> > the DSI specification.
> >
> > Add property to select the expected mode, this allows for example to
> > select a mode that is compatible with the DSI host interface.
> >
> > Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
> > ---
> >  .../devicetree/bindings/display/bridge/ti,sn65dsi83.yaml  | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi83.yaml b/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi83.yaml
> > index 48a97bb3e2e0..ebee16726b02 100644
> > --- a/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi83.yaml
> > +++ b/Documentation/devicetree/bindings/display/bridge/ti,sn65dsi83.yaml
> > @@ -35,6 +35,14 @@ properties:
> >    vcc-supply:
> >      description: A 1.8V power supply (see regulator/regulator.yaml).
> >
> > +  dsi-video-mode:
> > +    description: |
> > +      0 - burst-mode
> > +      1 - non-burst with sync event
> > +      2 - non-burst with sync pulse
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    enum: [0, 1, 2]
> 
> I'm thinking this can go to dsi common code since the video modes are
> common across all controllers and make the core initialize the default
> and update if any sink devices are willing to change the modes. Sound
> like a big move but worth useful.

Not sure I understood where do you want to move this.

In any case this is something about the display side of the DSI video
connection, with the bridge as a special case, not about the controller.
To my understanding the controller is supposed to support all the modes.

Francesco