With this patch the Exynos850 HSI2C becomes functional. The only nit-pick
from my side (just a food for thought): do we want to configure USI
related config inside of particular drivers (SPI, I2C, UART)? Or it would
be better design to implement some platform driver for that, so we can
choose USI configuration (SPI/I2C/UART) in device tree? I think this
series is good to be merged as is, but we should probably consider all
upsides and downsides of each option, for the future work.

I'm also considering how to support this USI configuration gracefully.
Current version of USI is v2 which means there is a v1 version as well. It might be a non-upstream SoC so we don't need to consider it so far.
But, there is a possibility that the USI hw version can be bumped for future SoCs.

As you probably know, earlier version of the product kernel has a USI SoC driver[1] and it was designed to be configured the USI settings by device tree.

Option1) Make a USI driver under soc/samsung/ like [1].
Option2) Use more generic driver such as "reset driver"? This might be required to extend the reset core driver.
Option3) Each USI driver(uart/i2c/spi) has its own USI configurations respectively and expose some configurations which can be variable as device tree.

[1]: https://github.com/ianmacd/d2s/blob/master/drivers/soc/samsung/usi_v2.c

Best Regards,
Chanho Park


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