SPRACD8 June   2019 DRA710 , DRA712 , DRA714 , DRA716 , DRA718 , DRA722 , DRA724 , DRA725 , DRA726 , DRA744 , DRA745 , DRA746 , DRA74P , DRA750 , DRA756 , DRA75P , DRA76P , DRA77P , DRA780 , DRA781 , DRA782 , DRA783 , DRA786 , DRA787 , DRA790 , DRA791 , DRA793 , DRA797 , TDA2EG-17 , TDA2HF , TDA2HG , TDA2HV , TDA2LF , TDA2P-ABZ , TDA2P-ACD , TDA2SA , TDA2SG , TDA2SX

 

  1.   Integrating New Cameras With Video Input Port on DRA7xx SoCs
    1.     Trademarks
    2. 1 Introduction
    3. 2 Video Input Port and Possible Video Sources
    4. 3 Kernel Changes to Integrate Camera Devices
      1. 3.1 V4L2 Endpoint Framework
        1. 3.1.1 VIP Device Definition
        2. 3.1.2 Camera Device Definition
      2. 3.2 Interfacing a Multichannel Video Source (TVP5158)
      3. 3.3 Interfacing a Camera Over LVDS Serializer Deserializer
        1. 3.3.1 I2C Address Remapping
        2. 3.3.2 Serializer/Deserializer Configuration
        3. 3.3.3 Serdes Device Definition
      4. 3.4 Setting up Pinmux and IODELAY
        1. 3.4.1 Getting Pinmux and IODELAY Values
      5. 3.5 Setting Up Board Muxes

3.3.1 I2C Address Remapping

When connecting a LVDS camera, all remote Inter-Integrated Circuit (I2C) devices are not directly connected. Serdes together acts as switch to forward the I2C messages back and forth. For this, each remote device has an alias address that is used by the local I2C master to communicate with the remote slave.

Figure 3 shows an example of interfacing LVDS camera and address translation.

serdes_address_i2c.gifFigure 3. Block Diagram of LVDS Camera Integration