linux-kernel - [PATCH 00/10] Support for CS42L83 on Apple machines

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Date:   Fri,  9 Sep 2022 15:53:24 +0200
From:   Martin Povišer <povik+lin@...ebit.org>
To:     James Schulman <james.schulman@...rus.com>,
        David Rhodes <david.rhodes@...rus.com>,
        Lucas Tanure <tanureal@...nsource.cirrus.com>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Martin Povišer <povik+lin@...ebit.org>
Cc:     Charles Keepax <ckeepax@...nsource.cirrus.com>,
        ChiYuan Huang <cy_huang@...htek.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Matt Flax <flatmax@...tmax.com>,
        - <patches@...nsource.cirrus.com>, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        asahi@...ts.linux.dev
Subject: [PATCH 00/10] Support for CS42L83 on Apple machines

Hi all,

there's a CS42L83 headphone jack codec found in Apple computers (in the
recent 'Apple Silicon' ones as well as in earlier models, one example
[1]). The part isn't publicly documented, but it appears almost
identical to CS42L42, for which we have a driver in kernel. This series
adapts the CS42L42 driver to the new part, and makes one change in
anticipation of a machine driver for the Apple computers.

Patch 1 adds new compatible to the cs42l42 schema.

Patches 2 to 7 are taken from Richard's recent series [2] adding
soundwire support to cs42l42. They are useful refactorings to build on
in later patches, and also this way our work doesn't diverge. I made
one fix: I added a call of common_remove at the end of i2c_probe should
the cs42l42_init call fail (both before and after the split to
cs42l42-i2c.c). Also s/Soundwire/SoundWire/ in the changelogs.

Patch 8 exports some regmap-related symbols from cs42l42.c so they can
be used to create cs42l83 regmap in cs42l83-i2c.c later.

Patch 9 is the cs42l83 support proper.

Patch 10 implements 'set_bclk_ratio' on the cs42l42 core. This will be
called by the upcoming ASoC machine driver for 'Apple Silicon' Macs.
(We have touched on this change to be made in earlier discussion, see
 [3] and replies.)

Best,
Martin

[1] https://www.ifixit.com/Teardown/MacBook+Pro+13-Inch+Touch+Bar+2018+Teardown/111384
[2] https://lore.kernel.org/alsa-devel/20220819125230.42731-1-rf@opensource.cirrus.com/T/#mc05cc6898be2c23fe2e7c8bb4ea4e4a00c1912a7
[3] https://lore.kernel.org/asahi/8961DDD2-93FF-4A18-BCA2-90FCE298F517@cutebit.org/

Martin Povišer (5):
  ASoC: dt-bindings: cs42l42: Add 'cs42l83' compatible
  ASoC: cs42l42: Split probe() and remove() into stages
  ASoC: cs42l42: Export regmap elements to the core namespace
  ASoC: cs42l83: Extend CS42L42 support to new part
  ASoC: cs42l42: Implement 'set_bclk_ratio'

Richard Fitzgerald (5):
  ASoC: cs42l42: Add bitclock frequency argument to cs42l42_pll_config()
  ASoC: cs42l42: Use cs42l42->dev instead of &i2c_client->dev
  ASoC: cs42l42: Split cs42l42_resume into two functions
  ASoC: cs42l42: Pass component and dai defs into common probe
  ASoC: cs42l42: Split I2C identity into separate module

 .../bindings/sound/cirrus,cs42l42.yaml        |   1 +
 MAINTAINERS                                   |   1 +
 include/sound/cs42l42.h                       |   1 +
 sound/soc/codecs/Kconfig                      |  15 +-
 sound/soc/codecs/Makefile                     |   6 +-
 sound/soc/codecs/cs42l42-i2c.c                | 112 ++++++++
 sound/soc/codecs/cs42l42.c                    | 256 +++++++++---------
 sound/soc/codecs/cs42l42.h                    |  24 +-
 sound/soc/codecs/cs42l83-i2c.c                | 248 +++++++++++++++++
 9 files changed, 538 insertions(+), 126 deletions(-)
 create mode 100644 sound/soc/codecs/cs42l42-i2c.c
 create mode 100644 sound/soc/codecs/cs42l83-i2c.c

-- 
2.33.0