Hello!
I'm trying to make RS-485 connection work in half-duplex mode on the i.MX8
Found this very similar problem here: https://community.nxp.com/t5/i-MX-Processors/Does-UART-in-RS485-mode-support-only-9-Bit-mode-for-i-M...
Looks like the solution was to add the rs485-enabled-at-boot-time property in the required uart node in the device tree. I searched in the kernel code and this is checked at the function uart_get_rs485_mode. If the property is present the SER_RS485_ENABLED flag is set
But digging deeper into the code, the function that should actually set the RTS pin to the required value is empty.
That function is mctrl_gpio_set which is called by both the function imx_uart_rts_active and imx_uart_rts_inactive
That can be checked here
I didn't test in my board yet to see if just adding the rs485-enabled-at-boot-time property enables the half-duplex comm. But I'm curious about why is that function empty in the kernel code
Thank you so much!
