linux-kernel - Re: [PATCH 4/9] drm/panel: simple: add support for overriding the pixel clock polarity

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Message-ID: <20171017121422.GE684@ulmo>
Date:   Tue, 17 Oct 2017 14:14:22 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Lothar Waßmann <LW@...O-electronics.de>
Cc:     David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/9] drm/panel: simple: add support for overriding the
 pixel clock polarity

On Wed, Oct 11, 2017 at 01:23:36PM +0200, Lothar Waßmann wrote:
> The Ka-Ro electronics MB7 baseboard has an on-board LCD->LVDS
> converter that requires a fixed pixelclk polarity, no matter what the
> panel's display_mode specifies. Add an option to override the pixelclk
> polarity defined in the panel's display_mode via DTB.

I'd argue that the LCD->LVDS converter should be modelled specifically
in DT to handle this case. It could be a implemented as a DRM bridge
driver, for example.

Thierry

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