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authorWerner Zeh <werner.zeh@siemens.com>2021-04-27 11:40:17 +0200
committerPatrick Georgi <pgeorgi@google.com>2021-05-02 21:53:03 +0000
commit45f449416d3929a875bff76c9ee534ca9aac9dcc (patch)
tree1dc8031f2f1f4f7a09c3e7567b189a0a86691f3d /Documentation/getting_started/license.md
parent0e351c9607290b72bd024ceef69afe848e0ed6d5 (diff)
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>
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