]> git.openfabrics.org - ~shefty/rdma-dev.git/commit
drivers/video/backlight/lp855x_bl.c: use generic PWM functions
authorKim, Milo <Milo.Kim@ti.com>
Tue, 18 Dec 2012 00:00:43 +0000 (16:00 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 18 Dec 2012 01:15:16 +0000 (17:15 -0800)
commit8cc9764c9c7d01a6e2c3ddac8f0ac7716be01868
tree29a1e895f720dcd8ee969df19ba089401e870f8b
parent05a5d4d2640dfe934ec78ba577dd21baccb11aa6
drivers/video/backlight/lp855x_bl.c: use generic PWM functions

The LP855x family devices support the PWM input for the backlight control.
 Period of the PWM is configurable in the platform side.  Platform
specific functions are unnecessary anymore because generic PWM functions
are used inside the driver.

(PWM input mode)
To set the brightness, new lp855x_pwm_ctrl() is used.
If a PWM device is not allocated, devm_pwm_get() is called.
The PWM consumer name is from the chip name such as 'lp8550' and 'lp8556'.
To get the brightness value, no additional handling is required.
Just the value of 'props.brightness' is returned.

If the PWM driver is not ready while initializing the LP855x driver, it's
OK.  The PWM device can be retrieved later, when the brightness value is
changed.

Documentation is updated with an example.

[akpm@linux-foundation.org: coding-style simplification, per Thierry]
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Cc: Thierry Reding <thierry.reding@avionic-design.de>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Bryan Wu <bryan.wu@canonical.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Documentation/backlight/lp855x-driver.txt
drivers/video/backlight/lp855x_bl.c
include/linux/platform_data/lp855x.h