As the DMA controller on Sophgo CV1800 series SoC only has 8 channels,
the SoC provides a dma multiplexer to reuse the DMA channel. However,
the dma multiplexer also controlls the DMA interrupt multiplexer, which
means that the dma multiplexer needs to know the channel number.

Change the DMA phandle args parsing logic so it can use handshake
number as channel number if necessary.

This patch series add fallback compatiable according to the disscussion.

Link: https://lore.kernel.org/all/MA5PR01MB1250079A8884D4F6245B955B9FE51A@MA5PR01MB12500.INDPRD01.PROD.OUTLOOK.COM

Change from v5:
- https://lore.kernel.org/all/20260426012921.673953-1-inochiama@gmail.com
1. Add dt-bindings patch for fallback compatiable
2. patch 2: Adapt the binding change.

Change from v4:
- https://lore.kernel.org/all/20260225104042.1138901-1-inochiama@gmail.com/
1. drop patch 1 and patch 2 as they are merged
2. Add ABI break statement and clarification for this patch.

Change from v3:
- https://lore.kernel.org/all/20260120013706.436742-1-inochiama@gmail.com/
1. rebase to v7.0-rc1
2. patch 1: Apply Conor's tag
3. patch 2: Apply Frank's tag

Change from v2:
- https://lore.kernel.org/all/20251214224601.598358-1-inochiama@gmail.com/
1. patch 2: rename "AXI_DMA_FLAG_HANDSHAKE_AS_CHAN" to "ARG0_AS_CHAN"

Change from v1:
- https://lore.kernel.org/all/20251212020504.915616-1-inochiama@gmail.com/
1. rebase to v6.19-rc1
2. patch 1: remove a comment placed in wrong place.
3. patch 2: fix typo in comments.
4. patch 2: initialize chan as NULL in dw_axi_dma_of_xlate.
Inochi Amaoto (2):
  dt-bindings: dma: snps,dw-axi-dmac: Add fallback compatible for
    CV1800B
  riscv: dts: sophgo: cv180x: Allow the DMA multiplexer to set channel
    number for DMA controller

 Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml | 5 +++--
 arch/riscv/boot/dts/sophgo/cv180x.dtsi                      | 2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)

--
2.54.0

On Mon, May 11, 2026 at 02:37:16PM +0800, Inochi Amaoto wrote:
> As the DMA controller on Sophgo CV1800 series SoC only has 8 channels,
> the SoC provides a dma multiplexer to reuse the DMA channel. However,
> the dma multiplexer also controlls the DMA interrupt multiplexer, which
> means that the dma multiplexer needs to know the channel number.
> 
> Change the DMA phandle args parsing logic so it can use handshake
> number as channel number if necessary.
> 
> This patch series add fallback compatiable according to the disscussion.
> 
> Link: https://lore.kernel.org/all/MA5PR01MB1250079A8884D4F6245B955B9FE51A@MA5PR01MB12500.INDPRD01.PROD.OUTLOOK.COM
> 
> Change from v5:
> - https://lore.kernel.org/all/20260426012921.673953-1-inochiama@gmail.com
> 1. Add dt-bindings patch for fallback compatiable
> 2. patch 2: Adapt the binding change.
> 
> Change from v4:
> - https://lore.kernel.org/all/20260225104042.1138901-1-inochiama@gmail.com/
> 1. drop patch 1 and patch 2 as they are merged
> 2. Add ABI break statement and clarification for this patch.
> 
> Change from v3:
> - https://lore.kernel.org/all/20260120013706.436742-1-inochiama@gmail.com/
> 1. rebase to v7.0-rc1
> 2. patch 1: Apply Conor's tag
> 3. patch 2: Apply Frank's tag
> 
> Change from v2:
> - https://lore.kernel.org/all/20251214224601.598358-1-inochiama@gmail.com/
> 1. patch 2: rename "AXI_DMA_FLAG_HANDSHAKE_AS_CHAN" to "ARG0_AS_CHAN"
> 
> Change from v1:
> - https://lore.kernel.org/all/20251212020504.915616-1-inochiama@gmail.com/
> 1. rebase to v6.19-rc1
> 2. patch 1: remove a comment placed in wrong place.
> 3. patch 2: fix typo in comments.
> 4. patch 2: initialize chan as NULL in dw_axi_dma_of_xlate.
> Inochi Amaoto (2):
>   dt-bindings: dma: snps,dw-axi-dmac: Add fallback compatible for
>     CV1800B
>   riscv: dts: sophgo: cv180x: Allow the DMA multiplexer to set channel
>     number for DMA controller
> 
>  Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml | 5 +++--
>  arch/riscv/boot/dts/sophgo/cv180x.dtsi                      | 2 +-
>  2 files changed, 4 insertions(+), 3 deletions(-)
> 
> --
> 2.54.0
> 

Please ignore this broken version, the right version is 
https://lore.kernel.org/all/20260511063818.463877-1-inochiama@gmail.com

Sorry for this noise.

Regard,
Inochi