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

[Inochi Amaoto <inochiama@gmail.com>]

On Thu, Jan 15, 2026 at 11:17:37PM +0400, Anton D. Stavinskii wrote:
> 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.
> 

I haven't see your mux driver, is it missed?

> 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>
> 

Thanks for your patch, for all the patchs, I hope you write a
meaningful comment for the patch, at least for now I found it
is nothing in your comment.

Also, the patch 8 should not in this patch and should be a
separate patch.

Regards,
Inochi