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

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Message-ID: <aUE9hDtflXpcgGnX@inochi.infowork>
Date: Tue, 16 Dec 2025 19:09:16 +0800
From: Inochi Amaoto <inochiama@...il.com>
To: "Anton D . Stavinskii" <stavinsky@...il.com>
Cc: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>, 
	Vinod Koul <vkoul@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>, 
	Chen Wang <unicorn_wang@...look.com>, Inochi Amaoto <inochiama@...il.com>, 
	Alexander Sverdlin <alexander.sverdlin@...il.com>, Longbin Li <looong.bin@...il.com>, 
	Ze Huang <huangze@...t.edu.cn>, dmaengine@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org, sophgo@...ts.linux.dev, 
	Yixun Lan <dlan@...too.org>
Subject: Re: [PATCH v2 0/3] riscv: sophgo: allow DMA multiplexer set channel
 number for DMA controller

On Mon, Dec 15, 2025 at 06:45:57AM +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.
> 
> 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(-)
> 
> --
> 2.52.0
> 

Hi Anton,

Since you have tested this patch before, could you give a Tested-by?

Regards,
Inochi