uart support with up to 4Mbps

[alaskora_byk_mstang]

 

I’m working on a project on custom board based on  IMX8MP in that I’m working with UART for data transfer. We are able to data pacages with 1.5Mbps i.e. with baud rate 1500000. As per the data sheet, UART can support up to 4Mbps and we would like to use it to the fullest. 

Could anyone help me with this. ?

 

[alaskora_byk_mstang]

Thanks it is working as expected

[Dhruvit · Accepted solution]

Hi @alaskora_byk_mstang,

I hope you are doing well.

UART baudrate depende upon module clock of UART.

module_clock frequency must always be greater or equal to 16x the maximum baud rate.

default module_clock frequency is 24 MHz.

Please make below change in uart node to support 4Mbps baudrate.

&uart1 { /* BT */

      pinctrl-names = "default";

      pinctrl-0 = <&pinctrl_uart1>;

      assigned-clocks = <&clk IMX8MM_CLK_UART1>;

      assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_80M>;

      fsl,uart-has-rtscts;

      status = "okay";

};

Thanks & Regards,
Dhruvit Vasavada