Messages in this thread | | | Date | Sat, 29 Jan 2011 21:53:50 +0100 | From | Lars-Peter Clausen <> | Subject | Re: [RFC] add pwmlib support |
| |
On 01/28/2011 01:21 PM, Sascha Hauer wrote: > Hi all, > > While implementing just another pwm driver I thought it's time to implement > generic pwm support. The following series adds drivers/pwm/pwmlib.c and > a i.MX23/28 pwm driver which serves as a usage example for pwmlib. The > code is inspired by gpiolib support and tested using the backlight pwm > driver by Eric Miao. > > Currently the pwm_request, pwm_add, pwm_remove and pwm_free operations are > protected with a single mutex wherea the pwm_enable, pwm_disable and > pwm_config operations are unlocked. It is assumed that the owners of the > pwm handle the serialization of the pwm accesses. This may not be enough, so > i'd like to discuss the locking (and type of locking) here. > > I Cced the people working with PWMs in the kernel in the hope that they can > give input on what's missing / wrong in this implementation > > Sascha >
Hi
There have been two other proposals for a generic PWM api during the last year. You might want to take a look at them.
https://lkml.org/lkml/2010/2/9/275 https://lkml.org/lkml/2010/9/28/107
I've added Bill Gatliff and Arun Murthy to Cc.
- Lars
| |