In RZ/N1D when UART1 (40060000) is configured under Linux (4.19) to use the auto-direction control (iUART_DE) then the RTS pin doesn't toggle as expected, whereas the same thing works with other UARTs. The dts for all UARTs are identical, and yet this feature does not work. I have checked that the registers are correctly programmed, but still it does not work.
Kindly suggest a solution.