[PATCH RFC v4] media: OF: add "sync-on-green-active" property

[Prabhakar Lad <prabhakar.csengg@gmail.com>]

From: "Lad, Prabhakar" <prabhakar.csengg@gmail.com>

This patch adds 'sync-on-green-active' property as part
of endpoint property.

Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
---
  Changes for v4:
  1: Fixed review comments pointed by Sylwester.
  
  Changes for v3:
  1: Fixed review comments pointed by Laurent and Sylwester.

  RFC v2 https://patchwork.kernel.org/patch/2578091/
  
  RFC V1 https://patchwork.kernel.org/patch/2572341/
  
 .../devicetree/bindings/media/video-interfaces.txt |    3 +++
 drivers/media/v4l2-core/v4l2-of.c                  |    4 ++++
 include/media/v4l2-mediabus.h                      |    2 ++
 3 files changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/media/video-interfaces.txt b/Documentation/devicetree/bindings/media/video-interfaces.txt
index e022d2d..5186c7e 100644
--- a/Documentation/devicetree/bindings/media/video-interfaces.txt
+++ b/Documentation/devicetree/bindings/media/video-interfaces.txt
@@ -101,6 +101,9 @@ Optional endpoint properties
   array contains only one entry.
 - clock-noncontinuous: a boolean property to allow MIPI CSI-2 non-continuous
   clock mode.
+- sync-on-green-active: polarity field when video synchronization is
+  Sync-On-Green. When set the driver determines whether it's a normal operation
+  or inverted operation.
 
 
 Example
diff --git a/drivers/media/v4l2-core/v4l2-of.c b/drivers/media/v4l2-core/v4l2-of.c
index aa59639..5c4c9f0 100644
--- a/drivers/media/v4l2-core/v4l2-of.c
+++ b/drivers/media/v4l2-core/v4l2-of.c
@@ -100,6 +100,10 @@ static void v4l2_of_parse_parallel_bus(const struct device_node *node,
 	if (!of_property_read_u32(node, "data-shift", &v))
 		bus->data_shift = v;
 
+	if (!of_property_read_u32(node, "sync-on-green-active", &v))
+		flags |= v ? V4L2_MBUS_VIDEO_SOG_ACTIVE_HIGH :
+			V4L2_MBUS_VIDEO_SOG_ACTIVE_LOW;
+
 	bus->flags = flags;
 
 }
diff --git a/include/media/v4l2-mediabus.h b/include/media/v4l2-mediabus.h
index 83ae07e..d47eb81 100644
--- a/include/media/v4l2-mediabus.h
+++ b/include/media/v4l2-mediabus.h
@@ -40,6 +40,8 @@
 #define V4L2_MBUS_FIELD_EVEN_HIGH		(1 << 10)
 /* FIELD = 1/0 - Field1 (odd)/Field2 (even) */
 #define V4L2_MBUS_FIELD_EVEN_LOW		(1 << 11)
+#define V4L2_MBUS_VIDEO_SOG_ACTIVE_HIGH	(1 << 12)
+#define V4L2_MBUS_VIDEO_SOG_ACTIVE_LOW		(1 << 13)
 
 /* Serial flags */
 /* How many lanes the client can use */
-- 
1.7.9.5