[PATCH v5 0/2] ASoC: spacemit: add i2s support to K1 SoC

[Troy Mitchell <troy.mitchell@linux.spacemit.com>]

On the K1 SoC, there is a full-duplex I2S controller.

The I2S is programmable, with the sample width configurable
to 8, 16, 18, or 32 bits.

A dedicated FIFO is provided for transmit (TXFIFO) and another
for receive (RXFIFO). In non-packed mode, both FIFOs are 32
entries deep and 32 bits wide, giving a total of 32 samples each.

The register definitions can be found here[1]

Link:
https://developer.spacemit.com/documentation?token=Rn9Kw3iFHirAMgkIpTAcV2Arnkf#18.2-spi%2Fi2s [1]

Signed-off-by: Troy Mitchell <troy.mitchell@linux.spacemit.com>
---
Changes in v5:
- Patch 1/2:
  - nothing
- Patch 2/2:
  - dont't read sspsp value in spacemit_i2s_init()
  - set SSPSP_FSRT bit for DSP_A mode (was missing in previous version)
- Link to v4: https://lore.kernel.org/all/20250921-k1-i2s-v4-0-4f819f50e468@linux.spacemit.com/

Changes in v4:
- Patch 1/2:
  - nothing
- Patch 2/2:
  - Only 8k, 16k and 48k rates are supported
  - Only 16-bit and 32-bit are supported
  - Use the runtime constraint API instead of modifying dai->driver
- Link to v3: https://lore.kernel.org/r/20250911-k1-i2s-v3-0-57f173732f9c@linux.spacemit.com

Changes in v3:
- Patch 1/2:
  - simplify dma-names definition
- Patch 2/2 
  - remove empty spacemit_i2s_remove()
  - move FSRT setup for DSP_A into switch-case in spacemit_i2s_set_fmt()
- Link to v2: https://lore.kernel.org/r/20250828-k1-i2s-v2-0-09e7b40f002c@linux.spacemit.com

Changes in v2:
- Patch 1/2:
  - modify commit message
  - remove unused third cell from pdma dmas property
  - update SPDX license in spacemit,k1-i2s.yaml to (GPL-2.0-only OR BSD-2-Clause)
- Patch 2/2:
  - modify commit message
  - reset_assert in dai_ops::remove
  - select CMA and DMA_CMA in Kconfig
  - use devm_reset_control_get_exclusive
- Link to v1: https://lore.kernel.org/r/20250814-k1-i2s-v1-0-c31149b29041@linux.spacemit.com

---
Troy Mitchell (2):
      ASoC: dt-bindings: Add bindings for SpacemiT K1
      ASoC: spacemit: add i2s support for K1 SoC

 .../devicetree/bindings/sound/spacemit,k1-i2s.yaml |  87 ++++
 sound/soc/Kconfig                                  |   1 +
 sound/soc/Makefile                                 |   1 +
 sound/soc/spacemit/Kconfig                         |  16 +
 sound/soc/spacemit/Makefile                        |   5 +
 sound/soc/spacemit/k1_i2s.c                        | 458 +++++++++++++++++++++
 6 files changed, 568 insertions(+)
---
base-commit: 4f010aced22532eea2ef0d9a2f5db7c64a196fec
change-id: 20250813-k1-i2s-115bf65eaac8

Best regards,
-- 
Troy Mitchell <troy.mitchell@linux.spacemit.com>