Hi Peter.

> Does the coreboot code communicate something to the OS driver already?

Yes, there is an ACPI entry which reports current timings in 
dw_i2c_acpi_write_speed_config() [1].
This code used to provide a report for all available speeds but was changed in 
[2]. Though I am not sure how much of the information would be used by the 
kernel driver at all. But at least a valid reporting should be something 
coreboot delivers. The rest is up to the driver.

Werner

[1]: 
https://review.coreboot.org/plugins/gitiles/coreboot/+/refs/heads/master/src/drivers/i2c/designware/dw_i2c.c#750
[2]: https://review.coreboot.org/c/coreboot/+/34385
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