[PATCH V4 04/10] drm/panel: Add driver for lvds/edp based panels

[Christian Gmeiner]

Hi


2014-06-11 20:27 GMT+02:00 Ajay Kumar <ajaykumar.rs at samsung.com>:
> This patch adds a simple driver to handle all the LCD and LED
> powerup/down routines needed to support eDP/LVDS panels.
>
> The LCD and LED units are usually powered up via regulators,
> and almost on all boards, we will have a BACKLIGHT_EN pin to
> enable/ disable the backlight.
> Sometimes, we can have LCD_EN switches as well.
>
> The routines in this driver can be used to control
> panel power sequence on such boards.
>
> Signed-off-by: Ajay Kumar <ajaykumar.rs at samsung.com>
> Signed-off-by: Rahul Sharma <Rahul.Sharma at samsung.com>
> ---
>  .../devicetree/bindings/panel/panel-lvds.txt       |   50 ++++
>  drivers/gpu/drm/panel/Kconfig                      |   10 +
>  drivers/gpu/drm/panel/Makefile                     |    1 +
>  drivers/gpu/drm/panel/panel-lvds.c                 |  262 ++++++++++++++++++++
>  4 files changed, 323 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/panel/panel-lvds.txt
>  create mode 100644 drivers/gpu/drm/panel/panel-lvds.c
>
> diff --git a/Documentation/devicetree/bindings/panel/panel-lvds.txt b/Documentation/devicetree/bindings/panel/panel-lvds.txt
> new file mode 100644
> index 0000000..7cb6084
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/panel/panel-lvds.txt
> @@ -0,0 +1,50 @@
> +panel interface for eDP/lvds panels
> +
> +Required properties:
> +  - compatible: "panel-lvds"
> +
> +Optional properties:
> +       -lcd-en-gpio:
> +               panel LCD poweron GPIO.
> +                       Indicates which GPIO needs to be powered up as output
> +                       to powerup/enable the switch to the LCD panel.
> +       -led-en-gpio:
> +               panel LED enable GPIO.
> +                       Indicates which GPIO needs to be powered up as output
> +                       to enable the backlight.
> +       -panel-prepare-delay:
> +               delay value in ms required for panel_prepare process
> +                       Delay in ms needed for the panel LCD unit to
> +                       powerup completely.
> +                       ex: delay needed till eDP panel throws HPD.
> +                           delay needed so that we cans tart reading edid.
> +       -panel-enable-delay:
> +               delay value in ms required for panel_enable process
> +                       Delay in ms needed for the panel backlight/LED unit
> +                       to powerup, and delay needed between video_enable and
> +                       backlight_enable.
> +       -panel-disable-delay:
> +               delay value in ms required for panel_disable process
> +                       Delay in ms needed for the panel backlight/LED unit
> +                       powerdown, and delay needed between backlight_disable
> +                       and video_disable.
> +       -panel-unprepare-delay:
> +               delay value in ms required for panel_post_disable process
> +                       Delay in ms needed for the panel LCD unit to
> +                       to powerdown completely, and the minimum delay needed
> +                       before powering it on again.
> +       -panel-width-mm: physical panel width [mm]
> +       -panel-height-mm: physical panel height [mm]
> +

For what are these two properties are needed?

If I find some time I will give this patch a try as I need something
like this for an imx6d based device.

greets
--
Christian Gmeiner, MSc

https://soundcloud.com/christian-gmeiner