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

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Message-ID: <ZCtB8Vu4Brm3G639@francesco-nb.int.toradex.com>
Date:   Mon, 3 Apr 2023 23:15:29 +0200
From:   Francesco Dolcini <francesco@...cini.it>
To:     Rob Herring <robh@...nel.org>
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,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Marek Vasut <marex@...x.de>, devicetree@...r.kernel.org,
        Francesco Dolcini <francesco.dolcini@...adex.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] dt-bindings: display: bridge: sn65dsi83: Add DSI
 video mode

On Mon, Apr 03, 2023 at 04:06:22PM -0500, Rob Herring wrote:
> On Thu, Mar 30, 2023 at 12:17:51PM +0200, Francesco Dolcini 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.
> 
> Why does this need to be in DT?

> The source and sink drivers should know what their capabilities are
> and pick the best common one.

Is there a best mode? Isn't this a decision how do we want the 2 peers
to communicate?

For the MIPI-DSI Linux/DRM experts: am I missing something? Is there
another way to have a DSI video sink to ask for a specific mode?

(I copied this from an existing DSI panel binding).

Francesco