About IMX8mm evk device tree

liwentao_1117 — Wed, 06 Mar 2024 08:01:45 GMT

fsl-imx8mm-evk.dts

uart1: serial@30860000S {
compatible = "fsl,imx8mm-uart",
"fsl,imx6q-uart", "fsl,imx21-uart";
reg = <0x0 0x30860000 0x0 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";
};

&uart1 { /* BT */
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart1>;
assigned-clocks = <&clk IMX8MM_CLK_UART1_SRC>;
assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_80M>;
fsl,uart-has-rtscts;
resets = <&modem_reset>;
status = "okay";
};

I wonder what the assigned-clocks do

Re: About IMX8mm evk device tree

joanxie — Thu, 07 Mar 2024 07:33:09 GMT

refer to the latest bsp

https://github.com/nxp-imx/linux-imx/blob/lf-6.1.y/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi

the clk uses IMX8MM_CLK_UART, for more detailed information about this clock, you can refer to the reference manual, this is uart1 root clock

i.MX ProcessorsのトピックAbout IMX8mm evk device tree

About IMX8mm evk device tree

Re: About IMX8mm evk device tree