Hi.
In imx8mm.dtsi, uart2 node don't include the dmas.
But other uart node (1. 2 and 4) include the dmas.
Why? and What is the impact of not including the dmas?
■ imx8mm.dtsi
https://github.com/torvalds/linux/blob/master/arch/arm64/boot/dts/freescale/imx8mm.dtsi
uart1: serial@30860000 {
compatible = "fsl,imx8mm-uart", "fsl,imx6q-uart";
reg = <0x30860000 0x10000>;
interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clk IMX8MM_CLK_UART1_ROOT>,
<&clk IMX8MM_CLK_UART1_ROOT>;
clock-names = "ipg", "per";
dmas = <&sdma1 22 4 0>, <&sdma1 23 4 0>;
dma-names = "rx", "tx";
status = "disabled";
};
uart3: serial@30880000 {
compatible = "fsl,imx8mm-uart", "fsl,imx6q-uart";
reg = <0x30880000 0x10000>;
interrupts = <GIC_SPI 28 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clk IMX8MM_CLK_UART3_ROOT>,
<&clk IMX8MM_CLK_UART3_ROOT>;
clock-names = "ipg", "per";
dmas = <&sdma1 26 4 0>, <&sdma1 27 4 0>;
dma-names = "rx", "tx";
status = "disabled";
};
uart2: serial@30890000 {
compatible = "fsl,imx8mm-uart", "fsl,imx6q-uart";
reg = <0x30890000 0x10000>;
interrupts = <GIC_SPI 27 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clk IMX8MM_CLK_UART2_ROOT>,
<&clk IMX8MM_CLK_UART2_ROOT>;
clock-names = "ipg", "per";
status = "disabled";
};
Best Regards.
