linux-kernel - [PATCH v2 0/7] ASoC: sophgo: add CV1800 I2S controllers support

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Message-Id: <20260118-cv1800b-i2s-driver-v2-0-d10055f68368@gmail.com>
Date: Sun, 18 Jan 2026 00:18:52 +0400
From: "Anton D. Stavinskii" <stavinsky@...il.com>
To: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Chen Wang <unicorn_wang@...look.com>, 
 Inochi Amaoto <inochiama@...il.com>, Jaroslav Kysela <perex@...ex.cz>, 
 Takashi Iwai <tiwai@...e.com>, Paul Walmsley <pjw@...nel.org>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Alexandre Ghiti <alex@...ti.fr>
Cc: linux-sound@...r.kernel.org, devicetree@...r.kernel.org, 
 sophgo@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 linux-riscv@...ts.infradead.org, 
 "Anton D. Stavinskii" <stavinsky@...il.com>
Subject: [PATCH v2 0/7] ASoC: sophgo: add CV1800 I2S controllers support

This patch series adds basic audio support for Sophgo CV1800B,
as used on boards such as the Milk-V Duo.
The series introduces the I2S controller driver,
the DAC and ADC codec drivers, corresponding DT bindings,
and DTS updates to wire the components together.

The implementation is based on vendor documentation
and testing on real hardware.  This series relies on
recent fixes in the DesignWare AXI DMA support;
in particular, correct operation depends on
the DMA changes discussed at:
https://lore.kernel.org/all/20251214224601.598358-1-inochiama@gmail.com/
The current driver implementation supports a fixed audio configuration
of 48 kHz sample rate and only I2S protocol which is used in codecs.
The series has been tested on the Milk-V Duo 256M board using
the Sophgo SG2002 SoC. The implementation is expected to also work on
Milk-V Duo and Milk-V Module boards based on the SG2000 SoC,
as the audio and DMA blocks are closely related.

Known hardware limitation:
On CV1800B / SG2002, the I2S2 output pins cannot be enabled via pinctrl alone.
Due to SoC design constraints, the output path becomes functional only after
additional vendor-specific register programming.
This series makes the limitation explicit and does not attempt to work around
it implicitly via pinctrl or undocumented behavior.

Signed-off-by: Anton D. Stavinskii <stavinsky@...il.com>
---
Changes in v2:
- Updated cover letter.
- codec nodes moved to cv1800x.dtsi with status=disabled
- the commit with dts example for 256M board was removed
- added details in commit messages

- Link to v1: https://lore.kernel.org/r/20260115-cv1800b-i2s-driver-v1-0-e8b22b8578ab@gmail.com

---
Anton D. Stavinskii (7):
      dt-bindings: sound: sophgo: add CV1800B I2S/TDM controller binding
      ASoC: sophgo: add CV1800B I2S/TDM controller driver
      dt-bindings: sound: sophgo: add CV1800B internal ADC codec
      ASoC: sophgo: add CV1800B internal ADC codec driver
      dt-bindings: sound: sophgo: add CV1800B internal DAC codec
      ASoC: sophgo: add CV1800B internal DAC codec driver
      riscv: dts: sophgo: dts nodes for i2s tdm modules

 .../bindings/sound/sophgo,cv1800b-i2s.yaml         |  75 +++
 .../bindings/sound/sophgo,cv1800b-sound-adc.yaml   |  43 ++
 .../bindings/sound/sophgo,cv1800b-sound-dac.yaml   |  43 ++
 arch/riscv/boot/dts/sophgo/cv180x-dmamux.h         |  57 ++
 arch/riscv/boot/dts/sophgo/cv180x.dtsi             |  63 ++
 sound/soc/Kconfig                                  |   1 +
 sound/soc/Makefile                                 |   1 +
 sound/soc/sophgo/Kconfig                           |  41 ++
 sound/soc/sophgo/Makefile                          |   5 +
 sound/soc/sophgo/cv1800b-sound-adc.c               | 322 ++++++++++
 sound/soc/sophgo/cv1800b-sound-dac.c               | 204 ++++++
 sound/soc/sophgo/cv1800b-tdm.c                     | 714 +++++++++++++++++++++
 12 files changed, 1569 insertions(+)
---
base-commit: 7a52965b6976c936f413eebeee3f78c6faf09012
change-id: 20260115-cv1800b-i2s-driver-4f17836dec56

Best regards,
-- 
Anton D. Stavinskii <stavinsky@...il.com>