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How to add support rs485 half duplex

Question asked by タイ チャン on Jan 8, 2019
Latest reply on Jan 10, 2019 by タイ チャン

Hello community.
I have MX6DL custome board using rs485 half duplex, currently using 4.1.15 kernel. 
I have seen the file imx.c in drivers / tty / serial / imx.c but it seems to not support rs485.
My question is how to add support rs485 mode half duplex?
Thanks in advance