Freescale Semiconductor i.MX 6DualLite, Справочное руководство

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Chapter 17
MIPI CSI2 Driver
17.1 Introduction
MIPI CSI-2 for i.MX 6 is MIPI-Camera Serial Interface Host Controller. It is a high
performance serial interconnect bus for mobile application which connects camera
sensors to the host system. The CSI-2 Host Controller is a digital core that implements all
protocol functions defined in the MIPI CSI-2 Specification. In doing so, it provides an
interface between the system and the MIPI D-PHY and allows communication with MIPI
CSI-2 compliant Camera Sensor.
The MIPI CSI2 driver is used to manage the MIPI D-PHY and allows it to co-work with
MIPI sensor and IPU CSI. MIPI CSI2 driver implements functions as follows:
• MIPI CSI-2 low-level interface for managing the mipi D-PHY register and clock
• MIPI CSI-2 common API for communication between MIPI sensor and MIPI D-
PHY
By calling MIPI common APIs, MIPI sensor can set certain information about sensor
(such as datatype, lanes number, etc.) to MIPI CSI2 driver to configure D-PHY. In order
for the IPU CSI module driver to have the correct configuration, receive appropriate data,
and process it correctly, it is necessary for it to receive information about sensor (such as
datatype, virtual channel, IPU id, CSI id, etc.) from the MIPI CSI2 driver.
17.1.1 MIPI CSI2 Driver Overview
MIPI CSI2 driver is invoked only by the mipi sensor driver and IPU CSI module. It is not
exposed to the user space.
MIPI CSI2 driver supports the following features:
• Supporting 1-4 lanes
• Supporting IPU(0,1) and CSI(0,1).
i.MX 6Solo/6DualLite Linux Reference Manual, Rev. L3.0.35_4.1.0, 09/2013
Freescale Semiconductor, Inc. 143