Are you using MX6 SabreSD board? By using default image, you jus need to put OV5640 camera sensor into MIPI port.
Besides configuration, you should check arch/arm/mach-mx6/board-mx6q_sabresd.c.
For example:
{
I2C_BOARD_INFO("ov5642", 0x3c),
.platform_data = (void *)&camera_data,
},
{
I2C_BOARD_INFO("ov5640_mipi", 0x3c),
.platform_data = (void *)&mipi_csi2_data,
},
....