On Jan 9 2011, Roland Stigge wrote:
Hi,
On 03/01/11 23:28, Greg KH wrote:
It's best to convert to the iio subsystem, as that is the way to go in
the future.
I'm also preparing a plain PWM driver for the LPC3250 SoC.
Would IIO be an appropriate place?
No. There is a pwm subsystem. I think thee actual drivers tend to go in the
relevant arch directory. So far I think all of the are all arch specific.
We do have some recently added support for direct digital synthesis (from
Analog devices). There's obviously some common functionality, though the
DDS devices tend to be for modulation purposes. Obviously pwm's have loads
of uses, but tend to only need a very simple interface. I have wondered if
we ought to support this as part of the dds interface, but so far I don't
think we have a device anyone would actually use as simply a pwm.
Anyhow, see include/linux/pwm.h for pwm interface. Examples of
implementations in arch/arm/plat-pxa and a few others in arch arm. Not that
many users yet based on a quick grep.
Anyhow, the code in place looks to have come from Russell King (arm
maintainer). I know Bill Gatliff proposed something similar...
http://lists.openwall.net/linux-kernel/2010/02/02/353
Hope that helps. Will take a look at ADC driver sometime tomorrow with
a bit of luck.
Thanks,
Jonathan
Thanks in advance,
Roland
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