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serial: uart: add hw flow control support configuration

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8250 uart driver currently supports only software assisted hw flow
control. The software assisted hw flow control maintains a hw_stopped
flag in the tty structure to stop and start transmission and use modem
status interrupt for the event to drive the handshake signals. This is
not needed if hw has flow control capabilities. This patch adds a
DT attribute for enabling hw flow control for a uart port. Also skip
stop and start if this flag is present in flag field of the port
structure.

Signed-off-by: Murali Karicheri <[email protected]>
CC: Rob Herring <[email protected]>
CC: Pawel Moll <[email protected]>
CC: Mark Rutland <[email protected]>
CC: Ian Campbell <[email protected]>
CC: Kumar Gala <[email protected]>
CC: Randy Dunlap <[email protected]>
CC: Jiri Slaby <[email protected]>
CC: Santosh Shilimkar <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Murali Karicheri 2014-05-01 15:04:53 -04:00 • committed by Greg Kroah-Hartman
commit 06aa82e498
4 changed files with 18 additions and 5 deletions
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1
Documentation/devicetree/bindings/serial/of-serial.txt
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@ -37,6 +37,7 @@ Optional properties:
- auto-flow-control: one way to enable automatic flow control support. The
driver is allowed to detect support for the capability even without this
property.
- has-hw-flow-control: the hardware has flow control capability.
Example: