Re: [PATCH] pwm-backlight: allow for non-increasing brightness levels

Hi Mike,

On Thu, Sep 12, 2013 at 11:35:52AM -0700, Mike Dunn wrote:

Currently the driver assumes that the values specified in the brightness-levels
device tree property increase as they are parsed from left to right.  But boards
that invert the signal between the PWM output and the backlight will need to
specify decreasing brightness-levels.  This patch removes the assumption that
the last element of the array is the max value, and instead searches the array
for the max value and uses that as the normalizing value when determining the
duty cycle.

Note there's also support for inverted PWMs in the PWM framework
provided your hardware supports this.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |