[PATCH RFC v2 00/11] Add support for AUDIN driver in Amlogic GXBB

Valerio Setti
2026-04-11T14:58:00Z

This series adds support for I2S audio input (AUDIN) on the Amlogic GXBB
platform.

It has been largely reshaped compared to what proposed in v1. Instead of
adding an HACK commit to allow AIU to export its clock so that also
AUDIN can control it, now the design closely follows what was implemented
in the Meson AXG platform. "aiu-encoder-i2s" becomes the shared interface
for playback/capture and it controls pins and clocks; data formatting
is implemented in formatters which are named "aiu-formatter-i2s" and
"audin-decoder-i2s" [1].
Formatters are DAPM widgets which are dynamically attached/detached to
the streams when the latters starts/stop, respectively.

As of now only I2S input is supported, because it's the only one
I could physically test in my setup, but other input sources (ex: SPDIF)
are also allowed according to the SOC's manual and can be added in the
future.
This series was tested on an OdroidC2 board (Amlogic S905 SOC) with an
NXP SGTL5000 codec connected to its I2S input port.

Since this work brings GX platform very close to the AXG one, once this
series is accepted, follow up work will be done in order to unify
GX and AXG formatters so as to minimize the number of implementations.

The series a bit long and it includes changes to drivers, dt-bindings and
device-tree. Of course this only happens because this is an RFC and I
wanted to give a full overview of what will be the final design. If no
objection is raised, this patch series will be split into 3: one for
reshaping AIU and introducing formatters, one to add AUDIN driver and its
dt-bindings, one for the device-tree changes.

[1]: Different naming for the aiu part is related to the fact that
"aiu-encoder-i2s" is already used for the interface and the goal
of this series was to introduce the minimum amount of changes that allow
I2S capture to work. Renaming can be implemented in the future as follow up
activity.

v1 -> v2:
- Reshaped design so that GX platforms will use the same design
pattern of AXG ones. This helped removing the need for an HACK commit.

--
2.39.5

---
Valerio Setti (11):
ASoC: meson: gx: add gx-formatter and gx-interface
ASoC: meson: aiu-encoder-i2s: use gx_iface and gx_stream structures
ASoC: meson: aiu: introduce I2S output formatter
ASoC: meson: aiu: use aiu-formatter-i2s to format I2S output data
ASoC: dt-bindings: amlogic: add schema for audin-formatter and audin-toddr
ASoC: meson: gx: add AUDIN I2S Decoder driver
ASoC: meson: gx: add AUDIN FIFO driver
ASoC: meson: aiu: add I2S Capture DAI
ASoC: meson: gx-card: add support for AUDIN FIFO
arm64: dts: amlogic: gx: add nodes for AUDIN decoder and FIFO
arm64: dts: amlogic: odroid-c2: add support for I2S audio input

.../sound/amlogic,meson-gx-audin-decoder-i2s.yaml | 49 +++
.../sound/amlogic,meson-gx-audin-fifo.yaml | 63 +++
arch/arm64/boot/dts/amlogic/meson-gx.dtsi | 32 ++
.../arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts | 34 ++
arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi | 26 ++
sound/soc/meson/Kconfig | 17 +
sound/soc/meson/Makefile | 6 +
sound/soc/meson/aiu-encoder-i2s.c | 219 +++++++----
sound/soc/meson/aiu-formatter-i2s.c | 106 +++++
sound/soc/meson/aiu.c | 37 +-
sound/soc/meson/aiu.h | 4 +
sound/soc/meson/audin-decoder-i2s.c | 218 +++++++++++
sound/soc/meson/audin-fifo.c | 432 +++++++++++++++++++++
sound/soc/meson/gx-card.c | 14 +-
sound/soc/meson/gx-formatter.c | 304 +++++++++++++++
sound/soc/meson/gx-formatter.h | 47 +++
sound/soc/meson/gx-interface.h | 50 +++
17 files changed, 1567 insertions(+), 91 deletions(-)
---
base-commit: 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f
change-id: 20260410-audin-rfc-243bcbf95e43

Best regards,
--
Valerio Setti <vsetti@baylibre.com>