[v4] riscv: sophgo: allow DMA multiplexer set channel number for DMA controller

[PATCH v4 0/3] riscv: sophgo: allow DMA multiplexer set channel number for DMA controller

Posted by Inochi Amaoto 1 month, 1 week ago

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.

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 (3):
  dt-bindings: dma: snps,dw-axi-dmac: Add CV1800B compatible
  dmaengine: dw-axi-dmac: Add support for CV1800B DMA
  riscv: dts: sophgo: cv180x: Allow the DMA multiplexer to set channel
    number for DMA controller

 .../bindings/dma/snps,dw-axi-dmac.yaml        |  1 +
 arch/riscv/boot/dts/sophgo/cv180x.dtsi        |  2 +-
 .../dma/dw-axi-dmac/dw-axi-dmac-platform.c    | 25 ++++++++++++++++---
 drivers/dma/dw-axi-dmac/dw-axi-dmac.h         |  1 +
 4 files changed, 24 insertions(+), 5 deletions(-)

--
2.53.0

Re: (subset) [PATCH v4 0/3] riscv: sophgo: allow DMA multiplexer set channel number for DMA controller

Posted by Inochi Amaoto 1 month, 1 week ago

On Wed, 25 Feb 2026 18:40:38 +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.
> 
> [...]

Applied to dt/riscv, thanks!

[3/3] riscv: dts: sophgo: cv180x: Allow the DMA multiplexer to set channel number for DMA controller
      https://github.com/sophgo/linux/commit/7b159ed9c81cf7e0d0b75666e6548ceface2e1b5

Thanks,
Inochi