[PATCH v2 0/6] ASoC: meson: gx: add base support for I2S audio input

[Valerio Setti]

This series is the 2nd part of the initial RFC [1] proposed to add audio
input support to the Meson GX SoCs. After the AIU reshaping series [2] that
has recently been merged, this one adds the audio input path itself.

Apart from some glue commits for gx-formatter Kconfig split, DT, bindings
and integration with gx-card, the core commit is the 3rd one, which adds
the AUDIN driver.
This is the counterpart of AIU for capture: it gets the entire register
range, it handles peripheral clock and reset, it instantiates the I2S data
formatter as widget and FIFOs as DAIs.

Resulting capture topology is:
  pads --> AIU I2S Encoder -> AUDIN I2S Formatter -> AUDIN FIFO -> RAM

This series includes all the changes related to this work (dt-bindings,
drivers and device-tree) in order to give the full picture in one single
place.

Unfortunately, since no Meson GXBB/GXL board available in the tree features
an I2S capture capable codec, this work cannot be directly tested out of
the box. To test it an external codec must be connected to the SoC.
When working on this series, a custom hat board with an NXP SGTL5000 codec
has been plugged on top of an Odroid-C2 (GXBB). The last commit of this
series fully details all the device-tree changes which are required to
finalize the support for this scenario.
With this hardware configuration it has been possible to successfully
validate the implementation with:
- alsa tools (arecord)
- pcm-tests

[1]: https://lore.kernel.org/linux-sound/20260411-audin-rfc-v2-0-4c8a6ec5fcab@xxxxxxxxxxxx/
[2]: https://lore.kernel.org/linux-sound/20260610-reshape-aiu-as-axg-v2-0-cac3663a8b51@xxxxxxxxxxxx/

Signed-off-by: Valerio Setti <vsetti@xxxxxxxxxxxx>
---
Changes in v2:
- Dropped FIFO child nodes from AUDIN in device-tree. Now AUDIN is the
  only sound component and FIFOs are its DAIs. This is the same design
  used in AIU. [Krzysztof]
- Renamed driver compatible, using 'amlogic,gx-audin' as fallback and
  'amlogic,gx[bb|l]-audin' as SoC specific. Fixed also other reported
  comments on the binding. [Krzysztof]
- Adjusted headers inclusion in 'audin.c' and spacing in the empty entry
  of 'meson_gx_audin_of_match'. [Uwe]
- Replaced 'snd_soc_component_read' with 'regmap_read' in 'audin_fifo_pos'
  in order to prevent sleeping in atomic context. Also changed the hrtimer
  from hard-irq to a soft-irq one. [Sashiko]
- Added 'sync_stop' callback in 'audin_component' to ensure the hrtimer is
  fully stopped before attempting to restart the stream in a
  "start->stop->prepare->start" scenario.
- Link to v1: https://patch.msgid.link/20260912-audin-v1-0-7fbefe928711@xxxxxxxxxxxx

To: Jerome Brunet <jbrunet@xxxxxxxxxxxx>
To: Liam Girdwood <lgirdwood@xxxxxxxxx>
To: Mark Brown <broonie@xxxxxxxxxx>
To: Rob Herring <robh@xxxxxxxxxx>
To: Krzysztof Kozlowski <krzk+dt@xxxxxxxxxx>
To: Conor Dooley <conor+dt@xxxxxxxxxx>
To: Valerio Setti <vsetti@xxxxxxxxxxxx>
To: Jaroslav Kysela <perex@xxxxxxxx>
To: Takashi Iwai <tiwai@xxxxxxxx>
To: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
To: Kevin Hilman <khilman@xxxxxxxxxxxx>
To: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
Cc: linux-sound@xxxxxxxxxxxxxxx
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-amlogic@xxxxxxxxxxxxxxxxxxx

---
Valerio Setti (6):
      ASoC: dt-bindings: amlogic,gx-audin: add schema
      ASoC: meson: build gx-formatter as a separate module
      ASoC: meson: add AUDIN driver
      ASoC: meson: aiu: add I2S Capture DAI
      ASoC: meson: gx-card: add support for audin FIFO
      arm64: dts: amlogic: gx: add AUDIN node

 .../bindings/sound/amlogic,gx-audin.yaml           |  66 ++++
 arch/arm64/boot/dts/amlogic/meson-gx.dtsi          |   9 +
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi        |   6 +
 arch/arm64/boot/dts/amlogic/meson-gxl.dtsi         |   6 +
 sound/soc/meson/Kconfig                            |  14 +
 sound/soc/meson/Makefile                           |   7 +-
 sound/soc/meson/aiu.c                              |   7 +
 sound/soc/meson/audin-fifo.c                       | 367 +++++++++++++++++++++
 sound/soc/meson/audin-formatter-i2s.c              | 174 ++++++++++
 sound/soc/meson/audin.c                            | 186 +++++++++++
 sound/soc/meson/audin.h                            |  30 ++
 sound/soc/meson/gx-card.c                          |  16 +-
 12 files changed, 880 insertions(+), 8 deletions(-)
---
base-commit: cee9395acd8043be0644b25c34bfa86623f2b935
change-id: 20260831-audin-9cabb450cc94

Best regards,
--  
Valerio Setti <vsetti@xxxxxxxxxxxx>