diff options
| author | Mark Jackson <mpfj-list@newflow.co.uk> | 2013-08-14 12:29:38 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-08-14 21:06:13 +0200 |
| commit | 4a0ac0f55b18dc297a87a85417fcf068658bf103 (patch) | |
| tree | 23630e4046be371b27568e9afa149e4bf1762a1b /drivers/tty/serial/sirfsoc_uart.h | |
| parent | tty: ar933x_uart: simplify use of devm_ioremap_resource (diff) | |
| download | linux-4a0ac0f55b18dc297a87a85417fcf068658bf103.tar.xz linux-4a0ac0f55b18dc297a87a85417fcf068658bf103.zip | |
OMAP: add RS485 support
This patch adds RS485 support to the OMAP serial driver, as
defined in:-
Documentation/devicetree/bindings/serial/rs485.txt
When a UART transmitter is connected to (eg) a RS485 driver, it is
necessary to turn the driver on/off as quickly as possible. This is
best achieved in the serial driver itself (rather than in userspace
where the latency can be quite large).
This patch allows a GPIO pin to be defined (via DT) that controls
the enabling of the driver at the start of a message, and disables
the driver when the message has been completed.
When RS485 is disabled, the RTS pin is set to on.
Signed-off-by: Mark Jackson <mpfj@newflow.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/sirfsoc_uart.h')
0 files changed, 0 insertions, 0 deletions