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authorAndrew Bresticker <abrestic@chromium.org>2014-04-22 04:09:10 +0530
committerInki Dae <daeinki@gmail.com>2014-06-02 02:07:05 +0900
commitb8b52471e87a713e61d26fa2f546fda0fb04e8fd (patch)
treee9bdacf10aec08ea529220fbe76c43c0a2e1535f /Documentation/devicetree/bindings/video
parentfbc2063d7b76d58e47a74b845148b3a9db052f16 (diff)
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>
Diffstat (limited to 'Documentation/devicetree/bindings/video')
-rw-r--r--Documentation/devicetree/bindings/video/exynos_dp.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/video/exynos_dp.txt b/Documentation/devicetree/bindings/video/exynos_dp.txt
index 57ccdde02c3a..53dbccfa80ca 100644
--- a/Documentation/devicetree/bindings/video/exynos_dp.txt
+++ b/Documentation/devicetree/bindings/video/exynos_dp.txt
@@ -62,6 +62,10 @@ Optional properties for dp-controller:
-hsync-active-high:
HSYNC polarity configuration.
High if defined, Low if not defined
+ -samsung,hpd-gpio:
+ Hotplug detect GPIO.
+ Indicates which GPIO should be used for hotplug
+ detection
Example:

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