regmap: sdw-mbq: Add support for SDCA deferred controls

Browse source

The SDCA specification allows for controls to be deferred. In the case
of a deferred control the device will return COMMAND_IGNORED to the
8-bit operation that would cause the value to commit. Which is the
final 8-bits on a write, or the first 8-bits on a read. In the case of
receiving a defer, the regmap will poll the SDCA function busy bit,
after which the transaction will be retried, returning an error if the
function busy does not clear within a chip specific timeout. Since
this is common SDCA functionality which is the 99% use-case for MBQs
it makes sense to incorporate this functionality into the register
map. If no MBQ configuration is specified, the behaviour will default
to the existing behaviour.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://patch.msgid.link/20250107154408.814455-5-ckeepax@opensource.cirrus.com
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Signed-off-by: Mark Brown <broonie@kernel.org>

...

This commit is contained in:

Charles Keepax 2025-01-07 15:44:06 +00:00 • committed by Mark Brown

parent fdd9ef3dce

commit 5bc493bf0c

No known key found for this signature in database

GPG key ID: 24D68B725D5487D0

2 changed files with 130 additions and 14 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

129

drivers/base/regmap/regmap-sdw-mbq.c

View file

15

include/linux/regmap.h

View file