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Commit 3c6938f8 authored by Sylwester Nawrocki's avatar Sylwester Nawrocki Committed by Mauro Carvalho Chehab
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[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: default avatarSylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Acked-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 4e2c53fd

include/media/v4l2-mediabus.h

+10 −2
Original line number Diff line number Diff line
@@ -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 */