[media] v4l2: Add polarity flag definitions for the parallel bus FIELD signal

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@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/include/media/v4l2-mediabus.h b/include/media/v4l2-mediabus.h
index 6114007c8c744d053dd328a883f378e19bfd9681..83ae07e533507cd86546b0741dc34fa93cacf604 100644 (file)
--- 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 */