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    SubjectRe: [PATCH] backlight: lcd: add driver for raster-type lcd's with gpio controlled panel reset
    On 01/07/2012 07:23 PM, Russell King - ARM Linux wrote:
    > On Thu, Jan 05, 2012 at 09:12:26PM +0530, Thomas Abraham wrote:
    >> Add a lcd panel driver for simple raster-type lcd's which uses a gpio
    >> controlled panel reset. The driver controls the nRESET line of the panel
    >> using a gpio connected from the host system. The Vcc supply to the panel
    >> is (optionally) controlled using a voltage regulator. This driver excludes
    >> support for lcd panels that use a serial command interface or direct
    >> memory mapped IO interface.
    >
    > I'm trying to work out what kind of LCD panel this is for. I assume
    > not the panels which would be connected to a SoC, which have a parallel
    > interface to a frame buffer device (LCD controller)?
    >
    > If this is for these kinds of LCD panels, how are you handling the
    > timing required for active panels - some of which must not be powered
    > up without the LCD controller first being setup and enabled, and must
    > be powered down before the LCD controller is disabled.
    >
    > I've seen this requirement with panels connected to ARM Ltd's development
    > boards, and also some SoCs.

    This is handled by the LCD framework. Or at least should be, see this patchset
    http://www.spinics.net/lists/linux-fbdev/msg04503.html

    - Lars


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