[PATCH V5 2/4] arm64: imx8mp: Read values from M24C32-D write-lockable page on DHCOM i.MX8MP

[Marek Vasut]

On 12/2/24 6:29 PM, Christoph Niedermaier wrote:
> The new i.MX8M Plus DHCOM rev.200 is populated with M24C32-D EEPROM
> that contains an additional write-lockable page called ID page, which
> is populated with a structure containing ethernet MAC addresses, DH
> item number and DH serial number.
> 
> Because the write-lockable page is not present on rev.100 i.MX8MP DHCOM
> SoM, test whether EEPROM ID page exists by setting up the i2c driver.
> 
> There may be multiple EEPROMs with an ID page on this platform, always
> use the first one. The evaluation of the EEPROM ID page is done in two
> steps. First, the content is read and checked. This is done to cache
> the content of the EEPROM ID page. Second, the content is extracted
> from the EEPROM buffer by requesting it.
> 
> For the ethernet MAC address the i.MX8M Plus DHCOM currently supports
> parsing address from multiple sources in the following priority order:
> 
> 1) U-Boot environment 'ethaddr'/'eth1addr' environment variable
> 2) SoC OTP fuses
> 3) On-SoM EEPROM
> 
> Add support for parsing the content of this new EEPROM ID page and place
> it between 2) and 3) on the priority list. The new entry is 2.5) On-SoM
> EEPROM write-lockable page.
> 
> Signed-off-by: Christoph Niedermaier <cniedermaier at dh-electronics.com>

Reviewed-by: Marek Vasut <marex at denx.de>