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

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Message-ID: <CAL_Jsq+EcROz1OYK28y814+Q__F=1obXe7EuXRBta+BRFjBJFA@mail.gmail.com>
Date:   Mon, 16 Oct 2017 17:13:29 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Lothar Waßmann <LW@...o-electronics.de>
Cc:     David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.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 6:23 AM, Lothar Waßmann <LW@...o-electronics.de> 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.

Wouldn't you know the polarity required based on the type of LVDS
converter chip in front of the panel? Or is that not being described
because it is "transparent".

Rob