2.20. V4L2 Media Bus functions and data structures

struct v4l2_mbus_config_mipi_csi2

MIPI CSI-2 data bus configuration

Definition:

struct v4l2_mbus_config_mipi_csi2 {
    unsigned int flags;
    unsigned char data_lanes[V4L2_MBUS_CSI2_MAX_DATA_LANES];
    unsigned char clock_lane;
    unsigned char num_data_lanes;
    bool lane_polarities[1 + V4L2_MBUS_CSI2_MAX_DATA_LANES];
};

Members

flags

media bus (V4L2_MBUS_*) flags

data_lanes

an array of physical data lane indexes

clock_lane

physical lane index of the clock lane

num_data_lanes

number of data lanes

lane_polarities

polarity of the lanes. The order is the same of the physical lanes.

struct v4l2_mbus_config_parallel

parallel data bus configuration

Definition:

struct v4l2_mbus_config_parallel {
    unsigned int flags;
    unsigned char bus_width;
    unsigned char data_shift;
};

Members

flags

media bus (V4L2_MBUS_*) flags

bus_width

bus width in bits

data_shift

data shift in bits

struct v4l2_mbus_config_mipi_csi1

CSI-1/CCP2 data bus configuration

Definition:

struct v4l2_mbus_config_mipi_csi1 {
    unsigned char clock_inv:1;
    unsigned char strobe:1;
    bool lane_polarity[2];
    unsigned char data_lane;
    unsigned char clock_lane;
};

Members

clock_inv

polarity of clock/strobe signal false - not inverted, true - inverted

strobe

false - data/clock, true - data/strobe

lane_polarity

the polarities of the clock (index 0) and data lanes index (1)

data_lane

the number of the data lane

clock_lane

the number of the clock lane

enum v4l2_mbus_type

media bus type

Constants

V4L2_MBUS_UNKNOWN

unknown bus type, no V4L2 mediabus configuration

V4L2_MBUS_PARALLEL

parallel interface with hsync and vsync

V4L2_MBUS_BT656

parallel interface with embedded synchronisation, can also be used for BT.1120

V4L2_MBUS_CSI1

MIPI CSI-1 serial interface

V4L2_MBUS_CCP2

CCP2 (Compact Camera Port 2)

V4L2_MBUS_CSI2_DPHY

MIPI CSI-2 serial interface, with D-PHY

V4L2_MBUS_CSI2_CPHY

MIPI CSI-2 serial interface, with C-PHY

V4L2_MBUS_DPI

MIPI VIDEO DPI interface

V4L2_MBUS_INVALID

invalid bus type (keep as last)

struct v4l2_mbus_config

media bus configuration

Definition:

struct v4l2_mbus_config {
    enum v4l2_mbus_type type;
    union {
        struct v4l2_mbus_config_parallel parallel;
        struct v4l2_mbus_config_mipi_csi1 mipi_csi1;
        struct v4l2_mbus_config_mipi_csi2 mipi_csi2;
    } bus;
};

Members

type

interface type

bus

bus configuration data structure

bus.parallel

embedded struct v4l2_mbus_config_parallel. Used if the bus is parallel or BT.656.

bus.mipi_csi1

embedded struct v4l2_mbus_config_mipi_csi1. Used if the bus is MIPI Alliance's Camera Serial Interface version 1 (MIPI CSI1) or Standard Mobile Imaging Architecture's Compact Camera Port 2 (SMIA CCP2).

bus.mipi_csi2

embedded struct v4l2_mbus_config_mipi_csi2. Used if the bus is MIPI Alliance's Camera Serial Interface version 2 (MIPI CSI2).

void v4l2_fill_pix_format(struct v4l2_pix_format *pix_fmt, const struct v4l2_mbus_framefmt *mbus_fmt)

Ancillary routine that fills a struct v4l2_pix_format fields from a struct v4l2_mbus_framefmt.

Parameters

struct v4l2_pix_format *pix_fmt

pointer to struct v4l2_pix_format to be filled

const struct v4l2_mbus_framefmt *mbus_fmt

pointer to struct v4l2_mbus_framefmt to be used as model

void v4l2_fill_mbus_format(struct v4l2_mbus_framefmt *mbus_fmt, const struct v4l2_pix_format *pix_fmt, u32 code)

Ancillary routine that fills a struct v4l2_mbus_framefmt from a struct v4l2_pix_format and a data format code.

Parameters

struct v4l2_mbus_framefmt *mbus_fmt

pointer to struct v4l2_mbus_framefmt to be filled

const struct v4l2_pix_format *pix_fmt

pointer to struct v4l2_pix_format to be used as model

u32 code

data format code (from enum v4l2_mbus_pixelcode)

void v4l2_fill_pix_format_mplane(struct v4l2_pix_format_mplane *pix_mp_fmt, const struct v4l2_mbus_framefmt *mbus_fmt)

Ancillary routine that fills a struct v4l2_pix_format_mplane fields from a media bus structure.

Parameters

struct v4l2_pix_format_mplane *pix_mp_fmt

pointer to struct v4l2_pix_format_mplane to be filled

const struct v4l2_mbus_framefmt *mbus_fmt

pointer to struct v4l2_mbus_framefmt to be used as model

void v4l2_fill_mbus_format_mplane(struct v4l2_mbus_framefmt *mbus_fmt, const struct v4l2_pix_format_mplane *pix_mp_fmt)

Ancillary routine that fills a struct v4l2_mbus_framefmt from a struct v4l2_pix_format_mplane.

Parameters

struct v4l2_mbus_framefmt *mbus_fmt

pointer to struct v4l2_mbus_framefmt to be filled

const struct v4l2_pix_format_mplane *pix_mp_fmt

pointer to struct v4l2_pix_format_mplane to be used as model