[PATCH v2 0/3] riscv: sophgo: allow DMA multiplexer set channel number for DMA controller

Inochi Amaoto
2025-12-14T22:47:05Z

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 v1:
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 | 26 ++++++++++++++++---
drivers/dma/dw-axi-dmac/dw-axi-dmac.h | 1 +
4 files changed, 25 insertions(+), 5 deletions(-)

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2.52.0