[PATCH v4 1/2] v4l2: Add polarity flag definitons for parallel bus FIELD signal

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FIELD signal is used for indicating frame field type to the frame grabber
in interlaced scan mode, as specified in ITU-R BT.601 standard.
In normal operation mode FIELD = 0 selects Field1 (odd) and FIELD = 1
selects Field2 (even). When the FIELD signal is inverted it's the other
way around.

Add corresponding flags for configuring the FIELD signal polarity,
V4L2_MBUS_FIELD_EVEN_HIGH for the standard (non-inverted) case and
V4L2_MBUS_FIELD_EVEN_LOW for inverted case.

Also add a comment about usage of V4L2_MBUS_[HV]SYNC* flags for
the hardware that uses [HV]REF signals.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
 include/media/v4l2-mediabus.h |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/include/media/v4l2-mediabus.h b/include/media/v4l2-mediabus.h
index 6114007..83ae07e 100644
--- a/include/media/v4l2-mediabus.h
+++ b/include/media/v4l2-mediabus.h
@@ -22,8 +22,12 @@
  */
 #define V4L2_MBUS_MASTER			(1 << 0)
 #define V4L2_MBUS_SLAVE				(1 << 1)
-/* Which signal polarities it supports */
-/* Note: in BT.656 mode HSYNC and VSYNC are unused */
+/*
+ * Signal polarity flags
+ * Note: in BT.656 mode HSYNC, FIELD, and VSYNC are unused
+ * V4L2_MBUS_[HV]SYNC* flags should be also used for specifying
+ * configuration of hardware that uses [HV]REF signals
+ */
 #define V4L2_MBUS_HSYNC_ACTIVE_HIGH		(1 << 2)
 #define V4L2_MBUS_HSYNC_ACTIVE_LOW		(1 << 3)
 #define V4L2_MBUS_VSYNC_ACTIVE_HIGH		(1 << 4)
@@ -32,6 +36,10 @@
 #define V4L2_MBUS_PCLK_SAMPLE_FALLING		(1 << 7)
 #define V4L2_MBUS_DATA_ACTIVE_HIGH		(1 << 8)
 #define V4L2_MBUS_DATA_ACTIVE_LOW		(1 << 9)
+/* FIELD = 0/1 - Field1 (odd)/Field2 (even) */
+#define V4L2_MBUS_FIELD_EVEN_HIGH		(1 << 10)
+/* FIELD = 1/0 - Field1 (odd)/Field2 (even) */
+#define V4L2_MBUS_FIELD_EVEN_LOW		(1 << 11)
 
 /* Serial flags */
 /* How many lanes the client can use */
-- 
1.7.6.3

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