tree 1dc8031f2f1f4f7a09c3e7567b189a0a86691f3d
parent 0e351c9607290b72bd024ceef69afe848e0ed6d5
author Werner Zeh <werner.zeh@siemens.com> 1619516417 +0200
committer Patrick Georgi <pgeorgi@google.com> 1619992383 +0000

mb/siemens/mc_apl{1,2,3,5,6}: Tune I2C frequency

All the boards in the patch have a constraint for the I2C bus to operate
on 100 kHz. Provide dedicated values for rise time, fall time and data
hold time on mainboard level to get a proper timing which takes the bus
load into account. Giving these values the driver computes the needed
timings correctly.

TEST=Measure I2C frequency on all boards while coreboot accesses
external RTC and make sure it is 100 kHz.

Change-Id: Iab634190bda5fa2a4fdf2ebaa1e45ac897d84deb
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52721
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>