On 10/12/11 15:42, Mark Brown wrote: > On Tue, Oct 11, 2011 at 05:24:47PM +0200, Arnd Bergmann wrote: >> On Tuesday 11 October 2011, Mark Brown wrote: > >>> I'm not sure that IIO isn't the kernel subsystem we're looking for here >>> - as I keep saying when this comes up it's just representing bare DACs >>> and ADCs pretty directly which looks like a generic subsystem to me. > >> Possible, yes. Until now, IIO is a subsystem for user-level access >> not for kernel access though, so it's not the right place yet. >> If we decide to let IIO handle all ADC input, do you think it would >> also be the right place to do PWM output, rather than having a >> separate subsystem for that? > > Off the top of my head I'd expect PWM to be a separate thing which could > optionally synthesize stuff onto an IIO device (bitbanging the PWM > essentially). The specialized PWM stuff tends to be "output this steady > state for an indefinite period" type interface rather than "here's a > batch of samples, output them". Same can be true of dds chips, with the addition that they often have gpio type switching between a set of predefined frequencies (FM basically). + weird waveform choices sometimes. -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
