FDT Support for GPIO (gpiobus and friends)

[Luiz Otavio O Souza]

Right, so after playing a little bit with IIC and SPI on FDT i have now a patch, which i believe, is more clean and complete to support an OFW GPIO bus in the same way as it has been done with IIC and SPI.

The first patch (001-ofw-gpiobus.diff) implements the OFW GPIO bus and all the changes to make possible to the available gpio devices (gpioled and gpioiic) attach to it.

The second patch (002-iicbb-ofw-iicbus.diff) implements the changes to make the OFW IIC bus attach to a gpioiic bit-banging (iicbb(4)) kind of driver.

The third patch (006-ofw-gpio-man.diff) has the manual changes for gpioiic and gpioled.

I would appreciate if you people could take a look and give me some feedback.

Luiz

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