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[75.72.162.184]) by smtp.gmail.com with ESMTPSA id e9e14a558f8ab-3de3761874esm13654385ab.9.2025.06.21.04.23.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 21 Jun 2025 04:23:13 -0700 (PDT) From: Adam Ford To: linux-arm-kernel@lists.infradead.org Cc: aford@beaconembedded.com, Adam Ford , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , devicetree@vger.kernel.org, imx@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] arm64: dts: imx8mm: Configure DMA on UART2 Date: Sat, 21 Jun 2025 06:23:09 -0500 Message-ID: <20250621112311.68101-1-aford173@gmail.com> X-Mailer: git-send-email 2.48.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250621_042315_285294_318DE4BD X-CRM114-Status: GOOD ( 10.04 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org UART2 is often used as the console, so the DMA was likely left off on purpose, since it's recomended to not use the DMA on the console. Beacause, the driver checks to see if the UART is used for the console when determining if it should initialize DMA, it should be safe to enable DMA on UART2 for all users. Signed-off-by: Adam Ford diff --git a/arch/arm64/boot/dts/freescale/imx8mm.dtsi b/arch/arm64/boot/dts/freescale/imx8mm.dtsi index cfebaa01217e..ded89b046970 100644 --- a/arch/arm64/boot/dts/freescale/imx8mm.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mm.dtsi @@ -915,6 +915,8 @@ uart2: serial@30890000 { clocks = <&clk IMX8MM_CLK_UART2_ROOT>, <&clk IMX8MM_CLK_UART2_ROOT>; clock-names = "ipg", "per"; + dmas = <&sdma1 24 4 0>, <&sdma1 25 4 0>; + dma-names = "rx", "tx"; status = "disabled"; }; }; -- 2.48.1