linux-kernel - Re: [PATCH v3 1/2] dt-bindings: display: bridge: Add bindings for SN65DSI83/84/85

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Date:   Mon, 15 Feb 2021 17:49:53 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Jagan Teki <jagan@...rulasolutions.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Sam Ravnborg <sam@...nborg.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-amarula <linux-amarula@...rulasolutions.com>,
        Marek Vasut <marex@...x.de>
Subject: Re: [PATCH v3 1/2] dt-bindings: display: bridge: Add bindings for
 SN65DSI83/84/85

Hi,

On 15/02/2021 12:25, Jagan Teki wrote:
> On Mon, Feb 15, 2021 at 2:32 PM Neil Armstrong <narmstrong@...libre.com> wrote:
>>
>> Hi,
>>
>> On 14/02/2021 18:44, Jagan Teki wrote:
>>> SN65DSI83/84/85 devices are MIPI DSI to LVDS based bridge
>>> controller IC's from Texas Instruments.
>>>
>>> SN65DSI83 - Single Channel DSI to Single-link LVDS bridge
>>> SN65DSI84 - Single Channel DSI to Dual-link LVDS bridge
>>> SN65DSI85 - Dual Channel DSI to Dual-link LVDS bridge
>>>
>>> Right now the bridge driver is supporting Channel A with single
>>> link, so dt-bindings documented according to it.
>>
>> Shouldn't it describe Dual-link LVDS already for SN65DSI84/85 and Dual Channel DSI for SN65DSI85 even if not implemented in the driver ?
> 
> Patch documented only Single link LVDS as it only supported by driver.
> Single link LVDS with Channel A configuration is common across all 3
> variant chips. I have SN65DSI84 with Single link LVDS which is routed
> in Channel A. Idea is to go with Single link and add double link later
> and document the same.

DT Bindings is unrelated to the software support, simply add the second LVDS channel endpoint
for SN65DSI84/85 and the second dsi endpoint for SN65DSI85.

Neil

> 
> Jagan.
>