Add i2c0 aka twi0 on sama5d4 xplained board.
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

Add at91 sama5d4 xplained board support.
Signed-off-by: NJosh Wu <josh.wu@atmel.com>
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

Add the leds DT node in the dts file.
In the leds, d10 is set as heartbeat led.
Signed-off-by: NJosh Wu <josh.wu@atmel.com>
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

Gpio-keys nodes are not using the "reg" property in their sub nodes.
So, there is no need to define #address-cells and #size-cells properties
in gpio-keys nodes: we remove them in these new boards.
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

During the submission of these new sama5d4 files, the GPL notice mentioned the
device tree as a library, which is not really accurate.
Fix all these library mentions to reflect the fact that it's actually just a
file.
Reported-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

Add reference SAMA5D4-EK platform DT file.
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: NJosh Wu <josh.wu@atmel.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>