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Stavinskii" Cc: dmaengine@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, sophgo@lists.linux.dev, linux-riscv@lists.infradead.org, Yixun Lan , Conor Dooley Subject: [PATCH v4 1/3] dt-bindings: dma: snps,dw-axi-dmac: Add CV1800B compatible Date: Wed, 25 Feb 2026 18:40:39 +0800 Message-ID: <20260225104042.1138901-2-inochiama@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260225104042.1138901-1-inochiama@gmail.com> References: <20260225104042.1138901-1-inochiama@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The DMA controller on CV1800B needs to use the DMA phandle args as the channel number instead of hardware handshake number, so add a new compatible for the DMA controller on CV1800B. Signed-off-by: Inochi Amaoto Acked-by: Conor Dooley --- Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml | 1 + 1 file changed, 1 insertion(+) diff --git a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml b/= Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml index 216cda21c538..96b0233d9b1b 100644 --- a/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml +++ b/Documentation/devicetree/bindings/dma/snps,dw-axi-dmac.yaml @@ -21,6 +21,7 @@ properties: - enum: - snps,axi-dma-1.01a - intel,kmb-axi-dma + - sophgo,cv1800b-axi-dma - starfive,jh7110-axi-dma - starfive,jh8100-axi-dma - items: --=20 2.53.0 From nobody Tue Apr 7 12:21:10 2026 Received: from mail-pl1-f170.google.com (mail-pl1-f170.google.com [209.85.214.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B48B3392C5A for ; Wed, 25 Feb 2026 10:41:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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Wed, 25 Feb 2026 02:41:13 -0800 (PST) Received: from localhost ([2001:19f0:ac00:4eb8:5400:5ff:fe30:7df3]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ad74f5dba7sm133070865ad.26.2026.02.25.02.41.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Feb 2026 02:41:13 -0800 (PST) From: Inochi Amaoto To: Eugeniy Paltsev , Vinod Koul , Frank Li , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Chen Wang , Inochi Amaoto , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Alexander Sverdlin , Longbin Li , Yixun Lan , Ze Huang , "Anton D. Stavinskii" Cc: dmaengine@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, sophgo@lists.linux.dev, linux-riscv@lists.infradead.org, Yixun Lan , Frank Li Subject: [PATCH v4 2/3] dmaengine: dw-axi-dmac: Add support for CV1800B DMA Date: Wed, 25 Feb 2026 18:40:40 +0800 Message-ID: <20260225104042.1138901-3-inochiama@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260225104042.1138901-1-inochiama@gmail.com> References: <20260225104042.1138901-1-inochiama@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 controls the DMA interrupt multiplexer, which means that the dma multiplexer needs to know the channel number. Allow the driver to use DMA phandle args as the channel number, so the DMA multiplexer can route the DMA interrupt correctly. Signed-off-by: Inochi Amaoto Reviewed-by: Frank Li --- .../dma/dw-axi-dmac/dw-axi-dmac-platform.c | 25 ++++++++++++++++--- drivers/dma/dw-axi-dmac/dw-axi-dmac.h | 1 + 2 files changed, 22 insertions(+), 4 deletions(-) diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c b/drivers/dma/d= w-axi-dmac/dw-axi-dmac-platform.c index 5d74bc29cf89..ada6dfc9b673 100644 --- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c +++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c @@ -50,6 +50,7 @@ #define AXI_DMA_FLAG_HAS_APB_REGS BIT(0) #define AXI_DMA_FLAG_HAS_RESETS BIT(1) #define AXI_DMA_FLAG_USE_CFG2 BIT(2) +#define AXI_DMA_FLAG_ARG0_AS_CHAN BIT(3) =20 static inline void axi_dma_iowrite32(struct axi_dma_chip *chip, u32 reg, u32 val) @@ -1358,16 +1359,27 @@ static int __maybe_unused axi_dma_runtime_resume(st= ruct device *dev) static struct dma_chan *dw_axi_dma_of_xlate(struct of_phandle_args *dma_sp= ec, struct of_dma *ofdma) { + unsigned int handshake =3D dma_spec->args[0]; struct dw_axi_dma *dw =3D ofdma->of_dma_data; - struct axi_dma_chan *chan; + struct axi_dma_chan *chan =3D NULL; struct dma_chan *dchan; =20 - dchan =3D dma_get_any_slave_channel(&dw->dma); + if (dw->hdata->use_handshake_as_channel_number) { + if (handshake >=3D dw->hdata->nr_channels) + return NULL; + + chan =3D &dw->chan[handshake]; + dchan =3D dma_get_slave_channel(&chan->vc.chan); + } else { + dchan =3D dma_get_any_slave_channel(&dw->dma); + } + if (!dchan) return NULL; =20 - chan =3D dchan_to_axi_dma_chan(dchan); - chan->hw_handshake_num =3D dma_spec->args[0]; + if (!chan) + chan =3D dchan_to_axi_dma_chan(dchan); + chan->hw_handshake_num =3D handshake; return dchan; } =20 @@ -1506,6 +1518,8 @@ static int dw_probe(struct platform_device *pdev) return ret; } =20 + chip->dw->hdata->use_handshake_as_channel_number =3D !!(flags & AXI_DMA_F= LAG_ARG0_AS_CHAN); + chip->dw->hdata->use_cfg2 =3D !!(flags & AXI_DMA_FLAG_USE_CFG2); =20 chip->core_clk =3D devm_clk_get(chip->dev, "core-clk"); @@ -1661,6 +1675,9 @@ static const struct of_device_id dw_dma_of_id_table[]= =3D { }, { .compatible =3D "intel,kmb-axi-dma", .data =3D (void *)AXI_DMA_FLAG_HAS_APB_REGS, + }, { + .compatible =3D "sophgo,cv1800b-axi-dma", + .data =3D (void *)AXI_DMA_FLAG_ARG0_AS_CHAN, }, { .compatible =3D "starfive,jh7110-axi-dma", .data =3D (void *)(AXI_DMA_FLAG_HAS_RESETS | AXI_DMA_FLAG_USE_CFG2), diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac.h b/drivers/dma/dw-axi-dma= c/dw-axi-dmac.h index b842e6a8d90d..67cc199e24d1 100644 --- a/drivers/dma/dw-axi-dmac/dw-axi-dmac.h +++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac.h @@ -34,6 +34,7 @@ struct dw_axi_dma_hcfg { bool reg_map_8_channels; 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Wed, 25 Feb 2026 02:41:16 -0800 (PST) From: Inochi Amaoto To: Eugeniy Paltsev , Vinod Koul , Frank Li , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Chen Wang , Inochi Amaoto , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Alexander Sverdlin , Longbin Li , Yixun Lan , Ze Huang , "Anton D. Stavinskii" Cc: dmaengine@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, sophgo@lists.linux.dev, linux-riscv@lists.infradead.org, Yixun Lan Subject: [PATCH v4 3/3] riscv: dts: sophgo: cv180x: Allow the DMA multiplexer to set channel number for DMA controller Date: Wed, 25 Feb 2026 18:40:41 +0800 Message-ID: <20260225104042.1138901-4-inochiama@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260225104042.1138901-1-inochiama@gmail.com> References: <20260225104042.1138901-1-inochiama@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Change the DMA controller compatible to the sophgo,cv1800b-axi-dma, which supports setting DMA channel number in DMA phandle args. Fixes: 514951a81a5e ("riscv: dts: sophgo: cv18xx: add DMA controller") Reported-by: Anton D. Stavinskii Closes: https://github.com/sophgo/linux/issues/9 Signed-off-by: Inochi Amaoto Tested-by: Anton D. Stavinskii --- arch/riscv/boot/dts/sophgo/cv180x.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/riscv/boot/dts/sophgo/cv180x.dtsi b/arch/riscv/boot/dts/s= ophgo/cv180x.dtsi index 06b0ce5a2db7..8446b4dfe1a1 100644 --- a/arch/riscv/boot/dts/sophgo/cv180x.dtsi +++ b/arch/riscv/boot/dts/sophgo/cv180x.dtsi @@ -417,7 +417,7 @@ sdhci1: mmc@4320000 { }; =20 dmac: dma-controller@4330000 { - compatible =3D "snps,axi-dma-1.01a"; + compatible =3D "sophgo,cv1800b-axi-dma"; reg =3D <0x04330000 0x1000>; interrupts =3D ; clocks =3D <&clk CLK_SDMA_AXI>, <&clk CLK_SDMA_AXI>; --=20 2.53.0