[PATCH 0/8] ASoC: sophgo: add CV1800 AIAO mux and I2S support

Anton D. Stavinskii
2026-01-15T19:18:02Z

This patch series adds basic audio support for Sophgo CV1800B,
as used on boards such as the Milk-V Duo.
The series introduces an AIAO audio mux driver,
an I2S controller driver, 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. 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@gmail.com>
---
Anton D. Stavinskii (8):
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
riscv: dts: sophgo: add Milk-V Duo 256M board dts

.../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/Makefile | 1 +
arch/riscv/boot/dts/sophgo/cv180x-dmamux.h | 57 ++
arch/riscv/boot/dts/sophgo/cv180x.dtsi | 49 ++
.../boot/dts/sophgo/sg2002-milkv-duo-256m.dts | 231 +++++++
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 +++++++++++++++++++++
14 files changed, 1787 insertions(+)
---
base-commit: 7a52965b6976c936f413eebeee3f78c6faf09012
change-id: 20260115-cv1800b-i2s-driver-4f17836dec56

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