[PATCH 1/4] regmap: sdw: move to -EOPNOTSUPP

[Pierre-Louis Bossart]

>>>> checkpatch is broken.
>>
>>> Heh, I'm not objecting it :)
>>
>>> OTOH, it's also true that ENOTSUPP is no good error code if returned
>>> to user-space.  Unfortunately many codes (including what I wrote) use
>>> this code mistakenly, and they can't be changed any longer...
>>
>> It's also used internally in various places without being returned to
>> userspace, that's what's going on here - the regmap core has some
>> specific checks for -ENOTSUPP.
> 
> Sure, for such an internal usage any code can be used.
> The question is a case like this -- where the return code might be
> carried to outside.  Though, looking through the grep output, all
> callers simply return -EINVAL for any errors, so it doesn't matter
> much for now.

I assumed this change to -EOPNOTSUPP reflected a consensus in 
kernel-land, it's obviously not the case. This patch was supposed to be 
a trivial clean-up...

So to be clear, what is the direction for existing code
a) keep -ENOTSUPP as is?
b) move to -EOPNOTSUPP?

And what is the preference for new code?