On 08/01/2012 11:26 AM, Borislav Petkov wrote: > On Wed, Aug 01, 2012 at 11:21:59AM +0200, Lars-Peter Clausen wrote: >> One major reason for the new PWM framework is to be able to support >> arch independent PWM drivers, like those for companion chips with PWM >> capabilities. Restricting the config option to certain architectures >> wouldn't work. > > Right, > > but when I enable the CONFIG_PWM option on x86, I don't see any drivers > there. So the logical thing to do would be to hide that option on arches > which don't have such chips.
You don't see any drivers, because the subsystem is still young and no such arch independent drivers have been added yet, but they will get added in the future. The arch independent companion or PWM expander chips usually interface via I2S or SPI and I would consider it quite likely that you'll also find them on some embedded X86 boards. If we add a arch restriction to the config item now we'd quite likely have to remove it again in the next release. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
