Dobrica Pavlinušić's random unstructured stuff

i2c: Revision 2

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/