serial: amba-pl011: add RS485 support

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Add basic support for RS485: Provide a callback to configure RS485
settings. Handle the RS485 specific part in the functions
pl011_rs485_tx_start() and pl011_rs485_tx_stop() which extend the generic
start/stop callbacks.
Beside via IOCTL from userspace RS485 can be enabled by means of the
device tree property "rs485-enabled-at-boot-time".

Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
Link: https://lore.kernel.org/r/20210630225644.3744-1-LinoSanfilippo@gmx.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Lino Sanfilippo 2021-07-01 00:56:44 +02:00 • committed by Greg Kroah-Hartman

parent 240e126c28

commit 8d47923772

1 changed files with 161 additions and 2 deletions

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drivers/tty/serial/amba-pl011.c

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