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

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Message-ID: <20251214224601.598358-1-inochiama@gmail.com>
Date: Mon, 15 Dec 2025 06:45:57 +0800
From: Inochi Amaoto <inochiama@...il.com>
To: 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>
Cc: "Anton D . Stavinskii" <stavinsky@...il.com>,
	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: [PATCH v2 0/3] riscv: sophgo: allow DMA multiplexer set channel number for DMA controller

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