From: Andrew Bresticker <abrestic@chromium.org>
Date: Mon, 21 Apr 2014 22:39:10 +0000 (+0530)
Subject: drm/exynos: dp: support hotplug detection via GPIO
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~44^2~17^2~48
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b8b52471e87a713e61d26fa2f546fda0fb04e8fd;p=pandora-kernel.git

drm/exynos: dp: support hotplug detection via GPIO

Certain bridge chips use a GPIO to indicate the cable status instead
of the I_DP_HPD pin.  This adds an optional device-tree property,
"samsung,hpd-gpio", to the exynos-dp controller which indicates that
the specified GPIO should be used for hotplug detection.
The GPIO is then set up as an edge-triggered interrupt where the
rising edge indicates hotplug-in and the falling edge indicates hotplug-out.

Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Signed-off-by: Rahul Sharma <rahul.sharma@samsung.com>
Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
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