Re: [PATCH 3/3] iio: Require strict scan mask matching in hardware mode

[Jonathan Cameron <jic23@kernel.org>]

On 06/03/2015 06:19 PM, Lars-Peter Clausen wrote:
> On 06/01/2015 12:34 PM, Jonathan Cameron wrote:
>> On 29/05/15 17:14, Lars-Peter Clausen wrote:
>>> In hardware mode we can not use the software demuxer, this means that
>>> the
>>> selected scan mask needs to match one of the available scan masks
>>> exactly.
>>>
>>> It also means that all attached buffers need to use the same scan mask.
>>> Given that when operating in hardware mode there is typically only a
>>> single
>>> buffer attached to the device this not an issue. Add a sanity check
>>> to make
>>> sure that only a single buffer is attached in hardware mode
>>> nevertheless.
>>>
>> That pretty much sums up why devices supporting only hardware buffers
>> are probably not going to be a long term feature!
>> Mind you for fast devices we may want to allow forced bypassing of the
>> demux (i.e. a hardware buffer).
>>
>> Out of curiosity is this series a precursor to another hardware buffered
>> device or just a useful intellectual exercise?
>
> It's all for real hardware and I'm already using it in some projects.
> E.g. one thing I'm working on is adding optional DMA support for some of
> the converters, if DMA is available it will use hardware mode. If no DMA
> is available or the consumer wants to run in software triggered mode
> fallback to software triggered mode.
Cool.  Looking forward to seeing the use cases!
>
> - Lars
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