> About this, we only need to do this because you are defining the gpio
> controller instances "statically" in the device tree. I understand gpio
> nodes can act as providers, but I do not see any device referencing the
> gpio nodes you are defining in the device tree.
They probably come later, and a board specific. The GPIO controllers
are probably SoC specific, so can be defined at the SoC .dtsi
level. The users are then in the board .dts files.
This is how GPIOs are typically used. Same will be true of I2C, the
SoC provides the I2C adaptor, the boards have devices on the bus,
again, described in DT.
Andrew
