tree 0e4d46c8a529410d6c93564b7770c36f0e03884b
parent 14612f698c1ec76555ebe4c89ca771795450dff1
author Werner Zeh <werner.zeh@siemens.com> 1667830558 +0100
committer Felix Held <felix-coreboot@felixheld.de> 1668003580 +0000

mb/siemens/mc_ehl2: Add dummy I2C devices to limit the I2C speed in OS

In Linux, the I2C speed defaults to 400 kHz if there is no device
registered in ACPI which requests a different speed. Due to board
limitations (layout, bus load), 400 kHz are too fast which results in a
timing violation. Therefore, add a dummy I2C device to both used I2C
buses (I2C1 and I2C2) with a speed of 100 kHz. This will limit the bus
speed in Linux accordingly.

Change-Id: I507c53c9ec7f763cef18903609231b1a66ed98fa
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69306
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>