Introducing CS42L43B codec, a variant of CS42L43 which can be driven by
the same driver.

Changes in CS42L43 driver specific for CS42L43B:
- Decimator 1 and 2 are dedicated to ADC, can't be selected for PDM
- Decimators 3 and 4 are connected to PDM1
- Added Decimator 5 and 6 for PDM2
- Supports SoundWire Clock Gearing
- Updated ROM requiring no patching
- Reduced RAM space
- Each ISRC has 4 decimators now

Signed-off-by: Maciej Strozek <mstrozek@opensource.cirrus.com>
---
Changes in v2:
 - Rework the mechanism to identify the new variant along with some
   error handling improvements.
 - Added some comments in cs42l43_readable_register() for clarity.
 - Add handling of the I2C path for the B variant
---
 drivers/mfd/cs42l43-i2c.c        |  7 ++-
 drivers/mfd/cs42l43-sdw.c        |  4 +-
 drivers/mfd/cs42l43.c            | 93 +++++++++++++++++++++++++++-----
 drivers/mfd/cs42l43.h            |  2 +-
 include/linux/mfd/cs42l43-regs.h | 76 ++++++++++++++++++++++++++
 include/linux/mfd/cs42l43.h      |  1 +
 6 files changed, 166 insertions(+), 17 deletions(-)

diff --git a/drivers/mfd/cs42l43-i2c.c b/drivers/mfd/cs42l43-i2c.c
index a2ab001a600a..0a0ab5e549a5 100644
--- a/drivers/mfd/cs42l43-i2c.c
+++ b/drivers/mfd/cs42l43-i2c.c

@@ -47,6 +47,7 @@ static int cs42l43_i2c_probe(struct i2c_client *i2c)
 	cs42l43->irq = i2c->irq;
 	/* A device on an I2C is always attached by definition. */
 	cs42l43->attached = true;
+	cs42l43->variant_id = (long)device_get_match_data(cs42l43->dev);

diff --git a/include/linux/mfd/cs42l43.h b/include/linux/mfd/cs42l43.h
index 2239d8585e78..8313f9e8c722 100644
--- a/include/linux/mfd/cs42l43.h
+++ b/include/linux/mfd/cs42l43.h

@@ -98,6 +98,7 @@ struct cs42l43 {
 	bool sdw_pll_active;
 	bool attached;
 	bool hw_lock;
+	int variant_id;
 };