lkml.org 
[lkml]   [2012]   [Jan]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    SubjectRe: [PATCH] backlight: lcd: add driver for raster-type lcd's with gpio controlled panel reset
    From
    Hi Russell,

    On 7 January 2012 23:53, Russell King - ARM Linux
    <linux@arm.linux.org.uk> 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 patch is for passive panels that use a nRESET line controlled by
    a SoC GPIO and the panel do not use serial command interface (i2c or
    spi) or memory-mapped-io for panel control. Panels that just need a
    nRESET to be controlled can be handled by this driver.

    Thanks,
    Thomas.
    --
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2012-01-11 12:01    [W:0.022 / U:65.224 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site