serial: stm32: add support for RS485 hardware control mode

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Implement Driver Enable signal (DE) to activate the transmission mode
of the external transceiver.

Signed-off-by: Yves Coppeaux <yves.coppeaux@st.com>
Signed-off-by: Bich Hemon <bich.hemon@st.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Bich HEMON 2018-03-12 09:50:05 +00:00 • committed by Greg Kroah-Hartman

parent 241672cb4b

commit 1bcda09d29

2 changed files with 132 additions and 1 deletions

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130

drivers/tty/serial/stm32-usart.c

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3

drivers/tty/serial/stm32-usart.h

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