Generally I2C3 communication can work via I2C3 or I2C4 pins.
Defaults are fine as long as one of the pin groups are floating or grounded or
both share I2C traces.
In NX boards I2C4 SDA is used for GC and connected to 1V8.
So if a GC is slotted, I2C3 works, if not, no communication is possible.
This config was done previously inside I2C3 consumer driver (touchscreen).
Now it's moved inside pinmux_config_i2c.
BDK will allow developers to use the full collection of drivers,
with limited editing, if any, for making payloads for Nintendo Switch.
Using a single source for everything will also help decoupling
Switch specific code and easily port it to other Tegra X1/X1+ platforms.
And maybe even to lower targets.
Everything is now centrilized into bdk folder.
Every module or project can utilize it by simply including it.
This is just the start and it will continue to improve.
