tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1* Freescale low power universal asynchronous receiver/transmitter (lpuart)
2
3Required properties:
4- compatible :
5 - "fsl,vf610-lpuart" for lpuart compatible with the one integrated
6 on Vybrid vf610 SoC with 8-bit register organization
7 - "fsl,ls1021a-lpuart" for lpuart compatible with the one integrated
8 on LS1021A SoC with 32-bit big-endian register organization
9 - "fsl,imx7ulp-lpuart" for lpuart compatible with the one integrated
10 on i.MX7ULP SoC with 32-bit little-endian register organization
11 - "fsl,imx8qxp-lpuart" for lpuart compatible with the one integrated
12 on i.MX8QXP SoC with 32-bit little-endian register organization
13 - "fsl,imx8qm-lpuart" for lpuart compatible with the one integrated
14 on i.MX8QM SoC with 32-bit little-endian register organization
15- reg : Address and length of the register set for the device
16- interrupts : Should contain uart interrupt
17- clocks : phandle + clock specifier pairs, one for each entry in clock-names
18- clock-names : For vf610/ls1021a/imx7ulp, "ipg" clock is for uart bus/baud
19 clock. For imx8qxp lpuart, "ipg" clock is bus clock that is used to access
20 lpuart controller registers, it also requires "baud" clock for module to
21 receive/transmit data.
22
23Optional properties:
24- dmas: A list of two dma specifiers, one for each entry in dma-names.
25- dma-names: should contain "tx" and "rx".
26- rs485-rts-active-low, linux,rs485-enabled-at-boot-time: see rs485.txt
27
28Note: Optional properties for DMA support. Write them both or both not.
29
30Example:
31
32uart0: serial@40027000 {
33 compatible = "fsl,vf610-lpuart";
34 reg = <0x40027000 0x1000>;
35 interrupts = <0 61 0x00>;
36 clocks = <&clks VF610_CLK_UART0>;
37 clock-names = "ipg";
38 dmas = <&edma0 0 2>,
39 <&edma0 0 3>;
40 dma-names = "rx","tx";
41 };