Kernel-4.18.0-80.el8_sirf-uart

• CSR SiRFprimaII/atlasVI Universal Synchronous Asynchronous Receiver/Transmitter *

Required properties:

• compatible : Should be “sirf,prima2-uart”, “sirf, prima2-usp-uart”,

    "sirf,atlas7-uart" or "sirf,atlas7-usp-uart".
  

• reg : Offset and length of the register set for the device
• interrupts : Should contain uart interrupt
• fifosize : Should define hardware rx/tx fifo size
• clocks : Should contain uart clock number

Optional properties:

• uart-has-rtscts: we have hardware flow controller pins in hardware
• rts-gpios: RTS pin for USP-based UART if uart-has-rtscts is true
• cts-gpios: CTS pin for USP-based UART if uart-has-rtscts is true

Example:

uart0: uart@b0050000 {
cell-index = <0>;
compatible = “sirf,prima2-uart”;
reg = <0xb0050000 0x1000>;
interrupts = <17>;
fifosize = <128>;
clocks = <&clks 13>;
};

On the board-specific dts, we can put rts-gpios and cts-gpios like

usp@b0090000 {
compatible = “sirf,prima2-usp-uart”;
uart-has-rtscts;
rts-gpios = <&gpio 15 0>;
cts-gpios = <&gpio 46 0>;
};