[PATCH] ASoC: dapm: Export new 'graph.dot' file in debugfs

[Pierre-Louis Bossart]

>>> Provide a DOT summary of the DAPM graph in a newly added 'graph.dot'
>>> file in debugfs, placed in the card's DAPM directory.
>>
>> There was a tool floating about in the past (last copy I knew about was
>> on Wolfson's git but they took that down) - can we not just continue to
>> do that?
> 
> I don’t know the tool or where would I find it. I think it’s neat
> simply having a ‘graph.dot’ at hand, especially since it requires
> little code. (Although sure there’s the danger of it growing.)

The Chrome folks used an 'asoc_dapm_graph' python script since 2014
according to the copyright information. IIRC it was python2 so might
need a bit of work.

https://chromium.googlesource.com/chromiumos/third_party/adhd/+/refs/heads/master/scripts/asoc_dapm_graph