RS485 serial communication for SAMA5D27-SOM1-EK1

[ghasseenn]

I am using SAMA5D27-SOM1-EK1 board.

I am using Linux 4.14 kernel version build with Yocto project. I have build core-image-minimal distribution.

This is my board device-tree :
https://github.com/torvalds/linux/blob/ ... om1_ek.dts

I want to set up RS485 serial communication.

I do not want to use RTS Pin , jusr RX / TX / GND.

I want to know, in detailed steps :

how to do that ?
Which drivers must be build into my kernel for that ?
Which PINs I must use from my board ? ( I only need RX, TX, GND lines )
Which node in the device-tree is related to RS485 communication ?
Any modifications to do for the device-tree ?

Thank you.

[blue_z]

I want to set up RS485 serial communication.

I do not want to use RTS Pin , jusr RX / TX / GND.

I want to know, in detailed steps :

Your exclusion is an incomplete specification (i.e. it's not "detailed").
The RTS line would control a transceiver in a half-duplex configuration.
Are you going to use full-duplex mode?

Regards

[ghasseenn]

I want to set up RS485 serial communication.

I do not want to use RTS Pin , jusr RX / TX / GND.

I want to know, in detailed steps :

Your exclusion is an incomplete specification (i.e. it's not "detailed").
The RTS line would control a transceiver in a half-duplex configuration.
Are you going to use full-duplex mode?

Regards

I want to use half-duplex mode

[blue_z]

I do not want to use RTS Pin , jusr RX / TX / GND.

I want to use half-duplex mode

How is direction control going to be accomplished?

Regards