MAX96712 GMSL Deserializer I2C address translation

Hi,

  Please note that, I2C drivers to work with 7 bit addressing,

  if your software/tool is using 7-bit I2C address, In that case we need to right shift the 8 bit map address to one.
  For example: 0x98 IO Map – 8 bit address
                      0x98 >>1 =0x4C – 7 bit address

   I2C source and destination address translation related details are provided here at MAX96711 14-Bit GMSL Serializer with High-Immunity/Bandwidth Mode and Coax/STP Cable Drive (analog.com)

   This link https://patchwork.kernel.org/project/linux-media/patch/20181102154723.23662-2-kieran.bingham@ideasonboard.com/ We got it from internet about regarding MAX chip I2C translation.

Thanks.

Poornima

I have the same problem. My camera is connected to it using a GMSL1 cable with max96705 and the I2c address is right.

REG - > VAL
0x642 -> 0x80
0x643 -> 0x40

But,it does not work either.

Hi,

I forgot this issue, but I think I found the answer to my initial message.

First, Poornima thanks for your feedback. My issue wasn't because I used 7 bit addresses instead of 8 bit addresses.

In fact the answer is in the documentation of the 96712. Here is the description of the Source address register for I2C translation:

Link A GMSL1 AND GMSL2 I2C AddressTranslator Source A:
When I2C device address matches SRC_A_P0_A, internal I2C master (on remote side) replaces the device address by
DST_A_P0_A. This setting applies only to I2C Port 0 for GMSL2. This setting applies to all I2C Ports for GMSL1.

In fact, in my setup, I have no I2C master on remote side, the master is on the local side. Hence, the translation feature of my serializer is working, as well as the deserializer's translation, but for the later it is not in the right direction for my setup: the I2C master is on local side for the 96712. Maybe someone can confirm my guess.

Anyway, I dropped the idea of I2C translation using the deserializer since I couldn't get it working.

I would like to add one last precision, I stumbled across the same issue with the MAX9296: the translation is working on my serializer (remote I2C master), but not on the deserializer (local I2C master). Since the setup is exactly the same as with the MAX96712, this corroborate my previous statement.

Best regards,

Louis Guerlin