Add dma support for lpuart[2..9]. The lpuart1 is debug console.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
 arch/arm64/boot/dts/freescale/imx93.dtsi | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx93.dtsi b/arch/arm64/boot/dts/freescale/imx93.dtsi
index acdca18673b7..c731eca4b3b5 100644
--- a/arch/arm64/boot/dts/freescale/imx93.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx93.dtsi
@@ -345,6 +345,8 @@ lpuart2: serial@44390000 {
 				interrupts = <GIC_SPI 20 IRQ_TYPE_LEVEL_HIGH>;
 				clocks = <&clk IMX93_CLK_LPUART2_GATE>;
 				clock-names = "ipg";
+				dmas = <&edma1 18 0 0>, <&edma1 19 0 1>;
+				dma-names = "tx", "rx";
 				status = "disabled";
 			};
 
@@ -666,6 +668,8 @@ lpuart3: serial@42570000 {
 				interrupts = <GIC_SPI 68 IRQ_TYPE_LEVEL_HIGH>;
 				clocks = <&clk IMX93_CLK_LPUART3_GATE>;
 				clock-names = "ipg";
+				dmas = <&edma2 17 0 0>, <&edma2 18 0 1>;
+				dma-names = "tx","rx";
 				status = "disabled";
 			};
 
@@ -675,6 +679,8 @@ lpuart4: serial@42580000 {
 				interrupts = <GIC_SPI 69 IRQ_TYPE_LEVEL_HIGH>;
 				clocks = <&clk IMX93_CLK_LPUART4_GATE>;
 				clock-names = "ipg";
+				dmas = <&edma2 19 0 0>, <&edma2 20 0 1>;
+				dma-names = "tx","rx";
 				status = "disabled";
 			};
 
@@ -684,6 +690,8 @@ lpuart5: serial@42590000 {
 				interrupts = <GIC_SPI 70 IRQ_TYPE_LEVEL_HIGH>;
 				clocks = <&clk IMX93_CLK_LPUART5_GATE>;
 				clock-names = "ipg";
+				dmas = <&edma2 21 0 0>, <&edma2 22 0 1>;
+				dma-names = "tx","rx";
 				status = "disabled";
 			};
 
@@ -693,6 +701,8 @@ lpuart6: serial@425a0000 {
 				interrupts = <GIC_SPI 71 IRQ_TYPE_LEVEL_HIGH>;
 				clocks = <&clk IMX93_CLK_LPUART6_GATE>;
 				clock-names = "ipg";
+				dmas = <&edma2 23 0 0>, <&edma2 24 0 1>;
+				dma-names = "tx","rx";
 				status = "disabled";
 			};
 
@@ -731,6 +741,8 @@ lpuart7: serial@42690000 {
 				interrupts = <GIC_SPI 210 IRQ_TYPE_LEVEL_HIGH>;
 				clocks = <&clk IMX93_CLK_LPUART7_GATE>;
 				clock-names = "ipg";
+				dmas = <&edma2 87 0 0>, <&edma2 88 0 1>;
+				dma-names = "tx","rx";
 				status = "disabled";
 			};
 
@@ -740,6 +752,8 @@ lpuart8: serial@426a0000 {
 				interrupts = <GIC_SPI 211 IRQ_TYPE_LEVEL_HIGH>;
 				clocks = <&clk IMX93_CLK_LPUART8_GATE>;
 				clock-names = "ipg";
+				dmas = <&edma2 89 0 0>, <&edma2 90 0 1>;
+				dma-names = "tx","rx";
 				status = "disabled";
 			};
 
-- 
2.34.1

Hi Frank,

On Wed, Aug 23, 2023 at 3:01 PM Frank Li <Frank.Li@nxp.com> wrote:
>
> Add dma support for lpuart[2..9]. The lpuart1 is debug console.

LPUART1 is the debug console on a particular board, but nothing prevents someone
to design an imx93 board that has another LPUART port as the debug console.

I suggest enabling DMA for all ports. That's what we do with other i.MX devices.

By the way, the fsl_lpuart driver disables DMA for the console:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/tty/serial/fsl_lpuart.c?h=v6.5-rc7#n1696