Linux driver for MAX517/518/519

[J.I. Cameron]

On Jan 9 2011, J.I. Cameron wrote:

>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.
Doh! DAC...  
>
>Thanks,
>
>Jonathan
>
>>
>>Thanks in advance,
>>
>>Roland
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>