Provide rise/fall times as measured on existing boards. This will
need adjusted for new boards but provides a starting point that
makes I2C clocks look reasonable.
Tested by measuring I2C bus speed and rise/fall times with a scope.
Change-Id: Ic18010f5efc41dcee8925d696767ba2c44e3df4b
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/30069
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Lijian Zhao <lijian.zhao@intel.com>
d2226060aa