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sc16is7xx: don't wipe out port configuration on shutdown
authorJakub Kicinski <kubakici@wp.pl>
Mon, 16 Mar 2015 23:28:47 +0000 (00:28 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 26 Mar 2015 21:38:36 +0000 (22:38 +0100)
EFCR register contains RS-485 configuration which should not
be changed by shutdown.  Instead of doing a write only update
the appropriate bits.

Signed-off-by: Jakub Kicinski <kubakici@wp.pl>
Signed-off-by: Jon Ringle <jringle@gridpoint.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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