gpiolib: Add comments explaining the _cansleep() WARN_ON()s
I've seen users getting very confused by the WARN_ON()s for can_sleep GPIOs in the atomic-safe paths, the discoverability of the non-atomic version of the API seems to be hampered by the fact that it's defined in a header file not the .c file where the warnings are. Add a couple of comments next to the warnings to help people on their way. Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com> Reviwed-by: NMark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
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