Hi,
Denis Carikli wrote:
> Cc: Richard Purdie <rpurdie@xxxxxxxxx>
> Cc: Jingoo Han <jg1.han@xxxxxxxxxxx>
> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> Cc: Rob Herring <rob.herring@xxxxxxxxxxx>
> Cc: Pawel Moll <pawel.moll@xxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Cc: Stephen Warren <swarren@xxxxxxxxxxxxx>
> Cc: Ian Campbell <ijc+devicetree@xxxxxxxxxxxxxx>
> Cc: devicetree@xxxxxxxxxxxxxxx
> Cc: Sascha Hauer <kernel@xxxxxxxxxxxxxx>
> Cc: Shawn Guo <shawn.guo@xxxxxxxxxx>
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: Lothar Waßmann <LW@xxxxxxxxxxxxxxxxxxx>
> Cc: Jean-Christophe Plagniol-Villard <plagnioj@xxxxxxxxxxxx>
> Cc: Thierry Reding <thierry.reding@xxxxxxxxx>
> Cc: Eric Bénard <eric@xxxxxxxxxx>
> Signed-off-by: Denis Carikli <denis@xxxxxxxxxx>
> ---
> ChangeLog v8->v9:
> - Added Shawn Guo in the Cc list.
> - The default-brightness-level is now a boolean default-on property,
> the gpio is only touched if the gpio-backlight driver instance probes.
> - The code and documentation was updated accordingly.
>
> ChangeLog v7->v8:
> - The default-state was renamed to default-brightness-level.
> - default-brightness-level is now mandatory, like for backlight-pwm,
> That way we avoid having to handle the case where it's not set,
> which means that we would need not to set the gpio, but still
> report a brightness value for sysfs, when not all gpio controllers are
> able to read the gpio value.
> - switched the default-brightness-level to boolean values (0 or 1) instead
> of using strings ("on", "off", "keep").
> - The documentation was updated accordingly.
> - The example in the documentation now uses the dts gpio defines.
> - The "backlight: gpio_backlight: Use a default state enum." patch was then
> dropped, becuase it is not necessary anymore.
>
> ChangeLog v6->v7:
> - removed a compilation warning with the removal of the useless ret declaration.
>
> ChangeLog v5->v6:
> - The default state handling was reworked:
> - it's now called default-state, and looks like the gpio-leds default-state.
> - it now has a "keep" option, like for the gpio-leds.
> - that "keep" option is the default when the default-state property is not set.
> - The documentation was updated accordingly.
>
> ChangeLog v4->v5:
> - The default-brightness property now defaults to 0 in the driver.
> - def_value int becomes a bool.
> - The check for the gpio validity has been reworked.
> ---
> .../bindings/video/backlight/gpio-backlight.txt | 19 +++++++
> drivers/video/backlight/gpio_backlight.c | 60 +++++++++++++++++---
> 2 files changed, 72 insertions(+), 7 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/video/backlight/gpio-backlight.txt
>
[...]
> +static struct of_device_id gpio_backlight_of_match[] = {
> + { .compatible = "gpio-backlight" },
> + { /* sentinel */ }
> +};
> +
> static struct platform_driver gpio_backlight_driver = {
> .driver = {
> .name = "gpio-backlight",
> .owner = THIS_MODULE,
> + .of_match_table = of_match_ptr(gpio_backlight_of_match),
>
useless use of of_match_ptr().
This would make sense, if the gpio_backlight_of_match struct was
conditionally compiled in depending on CONFIG_OF.
Since you unconditionally provide it you can use
&gpio_backlight_of_match directly.
Lothar Waßmann
--
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