From 7961529613b0d94de11a225a1e4bff3cc7c219e8 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Wed, 17 Sep 2014 12:11:41 +0200
Subject: [PATCH] tty: serial: 8250: allow to use custom DMA implementation

The OMAP has a few corner cases where it needs a share of kindness of
affection to do the right thing. Heikki Krogerus suggested that instead
adding the quirks into the default DMA implementation, OMAP could get
its own copy of the function. And Alan suggested the same thing so here
we go.

This patch provides callbacks for custom TX/RX DMA implementation. If
there are not setup / used, then the default (current) implementation is
used.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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