linux-kernel - [PATCH] arm64: dts: imx8mq: Add UART DMA support

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Message-Id: <20230221-uart-dma-v1-1-d20483bbd49d@puri.sm>
Date:   Tue, 21 Feb 2023 09:04:08 +0100
From:   Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>
To:     Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, kernel@...i.sm,
        Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>
Subject: [PATCH] arm64: dts: imx8mq: Add UART DMA support

UART ports have DMA capability. Describe the UART DMA properties.

Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>
---
 arch/arm64/boot/dts/freescale/imx8mq.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq.dtsi b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
index 98fbba4c99a9..142a5c894e1e 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
@@ -940,6 +940,8 @@ uart1: serial@...60000 {
 				clocks = <&clk IMX8MQ_CLK_UART1_ROOT>,
 				         <&clk IMX8MQ_CLK_UART1_ROOT>;
 				clock-names = "ipg", "per";
+				dmas = <&sdma1 22 4 0>, <&sdma1 23 4 0>;
+				dma-names = "rx", "tx";
 				status = "disabled";
 			};
 
@@ -951,6 +953,8 @@ uart3: serial@...80000 {
 				clocks = <&clk IMX8MQ_CLK_UART3_ROOT>,
 				         <&clk IMX8MQ_CLK_UART3_ROOT>;
 				clock-names = "ipg", "per";
+				dmas = <&sdma1 26 4 0>, <&sdma1 27 4 0>;
+				dma-names = "rx", "tx";
 				status = "disabled";
 			};
 
@@ -962,6 +966,8 @@ uart2: serial@...90000 {
 				clocks = <&clk IMX8MQ_CLK_UART2_ROOT>,
 				         <&clk IMX8MQ_CLK_UART2_ROOT>;
 				clock-names = "ipg", "per";
+				dmas = <&sdma1 24 4 0>, <&sdma1 25 4 0>;
+				dma-names = "rx", "tx";
 				status = "disabled";
 			};
 
@@ -1157,6 +1163,8 @@ uart4: serial@...60000 {
 				clocks = <&clk IMX8MQ_CLK_UART4_ROOT>,
 				         <&clk IMX8MQ_CLK_UART4_ROOT>;
 				clock-names = "ipg", "per";
+				dmas = <&sdma1 28 4 0>, <&sdma1 29 4 0>;
+				dma-names = "rx", "tx";
 				status = "disabled";
 			};
 

---
base-commit: 89f5349e0673322857bd432fa23113af56673739
change-id: 20230221-uart-dma-df84665c6a97

Best regards,
-- 
Sebastian Krzyszkowiak <sebastian.krzyszkowiak@...i.sm>