RS485 with GPIO on iMX8

Technical Support
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1

Hi,

I am trying to use an iMX8 on a board that was designed for the iMX7, therefor I have to control the RS485 with a GPIO and not with the RTS line.

I added the required rts-gpio property, but it doesnt work:

/* Colibri UART_C */
&lpuart2 {	
	rts-gpios = <&gpio0 22 0>;
	
	rs485-rts-active-low;
    linux,rs485-enabled-at-boot-time;
	
	status = "okay";
};

Does the iMX8 kernel don’t support the gpio feature for RS485?

3

Hi @gandi

Unfortunately the RS485 driver of the iMX8 can’t handle RTS line with GPIOs with the current kernel.

Why did you upgrade to iMX8? What is your application?

Best regards,
Jaski