From: Russell King <rmk+kernel@arm.linux.org.uk>
Date: Tue, 17 Apr 2012 16:23:14 +0000 (+0100)
Subject: SERIAL: core: add throttle/unthrottle callbacks for hardware assisted flow control
X-Git-Tag: omap-for-v3.8/fixes-for-merge-window-v4-signed~66^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9aba8d5b011193c8e01d565c5b585df5b94f1db2;p=pandora-kernel.git

SERIAL: core: add throttle/unthrottle callbacks for hardware assisted flow control

Add two callbacks for hardware assisted flow control; we need to know
when the tty layers want us to stop and restart due to their buffer
levels.

Call a driver specific throttle/unthrottle function if and only if the
driver indicates that it is using an enabled hardware assisted flow
control method, otherwise fall back to the non-hardware assisted
methods.

Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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