[PATCH v4 0/7] ASoC: apple: mca: support simultaneous I2S capture on the frontend

Hi folks,

This series introduces a number of changes to the ASoC driver
for the Apple MCA peripheral to enable support for bidirectional
I2S. This is achieved by allowing frontends to act as clock consumers
and logically ORing data input lines when multiple backends are linked
to a frontend.

This allows the Texas Instruments speaker amps used on Apple Silicon Macs
(Apple-specific revisions of TAS2764 and TAS2770) to send their IVSENSE
data back to the SoC. Since these amps do not have any sort of integrated
speaker protection logic, we must use the IVSENSE data and the Thiele/Small
Parameters of the attached speaker(s) to implement our own in software.

---
Changes in v4:
- Fix remaining port_driver reference (sorry...)
- Link to v3: https://patch.msgid.link/[email protected]

Changes in v3:
- Changed magic number write in fe prepare to BIT(port)
- Link to v2: https://patch.msgid.link/[email protected]

Changes in v2:
- Drop readx_poll_timeout use. It ended up being unreliable. Fall back
  to just bumping up the delay on SERDES reset :/
- Rebase on asoc/for-next
- Drop the one patch that was applied
- Drop clock shutdown relocation patch. This was not actually required
  and the incorrect thing to do anyway.
---

Link to v1: https://lore.kernel.org/asahi/[email protected]/

Regards,
James

To: Martin Povišer <[email protected]>
To: Liam Girdwood <[email protected]>
To: Mark Brown <[email protected]>
To: Jaroslav Kysela <[email protected]>
To: Takashi Iwai <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]

---
Hector Martin (2):
      ASoC: apple: mca: Do not mark clocks in use for non-providers
      ASoC: apple: mca: Add delay after configuring clock

James Calligeros (1):
      ASoC: apple: mca: increase SERDES reset delay

Martin Povišer (4):
      ASoC: apple: mca: Separate data & clock port setup
      ASoC: apple: mca: Factor out mca_be_get_fe
      ASoC: apple: mca: Support FEs being clock consumers
      ASoC: apple: mca: Support capture on multiples BEs

 sound/soc/apple/mca.c | 300 +++++++++++++++++--------
 1 file changed, 207 insertions(+), 93 deletions(-)
---
base-commit: be44d21728b6646189779923b841ad3a46d694e5
change-id: 20260623-apple-audio-redux-b7b43d9c02af

Best regards,
--  
James Calligeros <[email protected]>