From f180ebae1ac05805acdb808eb92e63ddbd014934 Mon Sep 17 00:00:00 2001
From: Josh Wu <josh.wu@atmel.com>
Date: Sun, 1 Mar 2015 22:52:38 -0300
Subject: [PATCH] [media] media: ov2640: add async probe function

In async probe, there is a case that ov2640 is probed before the
host device which provided 'mclk'.
To support this async probe, we will get 'mclk' at first in the probe(),
if failed it will return -EPROBE_DEFER. That will let ov2640 wait for
the host device probed.

Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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