Dobrica Pavlinušić's random unstructured stuff

i2c: Revision 4

I will try to collect useful info about Linux I2C infrastructure

* wirting regmap drivers https://opensourceforu.com/2017/01/regmap-reducing-redundancy-linux-code/
* Using the I2C-Stub to Emulate a Device https://eraretuya.github.io/2016/12/10/the-i2c-stub-in-action/
* very good overview of i2c and bus arbitration and testing https://elinux.org/images/c/c9/ELCE17-WSang-I2C-Fault-Injector.pdf
** https://www.youtube.com/watch?v=2UU_26rlJHs