On Tuesday 28 May 2013 at 13:00:12, Thierry Reding wrote: > On Mon, May 27, 2013 at 07:12:08PM +0200, Arnd Bergmann wrote: > > On Monday 27 May 2013, H Hartley Sweeten wrote: > > > Also, I have a question about the conversion. > > > > > > If I strip the sysfs support out of this driver the conversion is > > > quite simple. But, my use for this driver requires user space > > > control of the PWM. > > > > > > Should I: > > > 1) convert the driver to the PWM framework and leave the sysfs stuff > > > in it 2) work out a generic sysfs support for the PWM framework and > > > then > > > > > > convert the driver > > > > > > 3) other... > > > > > > I've been looking at 2) by doing something like how gpiolib does it. > > > Do you think that would be acceptable? > > > > That would be for Thierry to decide. It does sound better to me than > > the 1) and I don't have a better idea for 3). > > > > I wonder how the arbitration between in-kernel and user-space > > consumers of the pwm lines would work though. > > I've added Lars Poeschel on Cc, who's done some work on a sysfs > interface for the PWM subsystem already. It's undergone some review > already[0] and I think he's working on a v2 now. > > Thierry > > [0]: http://marc.info/?l=linux-kernel&m=136499756101273&w=2
I currently do not have the time to work on a v2 of the pwm sysfs patch but I will do it as soon as possible - if not someone else will do. Unfortunately my current involvements in other project will not allow me to do so for at least next two months. I received some off-list reactions to my patches from users asking for pwm sysfs, so there is definitely a need for it! If you decide to take attempt 2) (which is preferable) I recommend you to take a look at what I have done and Thierrys review comments. I took the gpiolib way and the result got rejected for very good reasons. Regards, Lars -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
