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net: ipa: fix up IPA register comments
Revise or add comments in "ipa_reg.h" for to provide more
information, and to improve clarity and consistency.
- Always provide a comment to define when a register or field is
supported (or not) for certain versions of IPA hardware.
- Try to be specific about *which* or *how many* definitions
a comment refers to.
- Move comments stating that ipa->available defines the valid
bits in various registers *above* the register offset
definition, to avoid some checkpatch.pl warnings.
No code is changed by this patch.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>