ARM: sunxi: dt: Add PIO controller to A31 DTSI

The A31 has a different set of pins than the one found on the A10 and
A13. Now that we have support for the A31 pin set in the pinctrl driver,
we can enable it in the DTSI with its own compatible.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
ARM: sun6i: Add UART0 muxing options

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
ARM: sun6i: colombus: Add uart0 muxing

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
ARM: sun7i: Add the PIO controller node to the DTSI

The PIO controller is responsible for the GPIO/muxing/external
interrupts handling. Now that we have support for the A20 pin set in the
pinctrl driver, we can start using it in the DTSI.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
ARM: sun7i: DT: Add UART muxing options to the DTSI

The UARTs on the A20 can be muxed to several pins. Add a few options to
the DTSI so that we can start using them in the boards' DT.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
ARM: sun7i: a20-olinuxino: Enable UARTs muxing

Instead of relying on the bootloader to mux the UART pins properly, do
it on our own and register the rightful pins for the A20-olinuxino in
the DT using pinctrl.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
ARM: sun7i: a20-olinuxino: Enable the user LED

The A20-olinuxino Micro has a LED connected to the PH2 pin. Use the
gpio-led driver to enable the control over this LED.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
ARM: sun7i: Add Cubieboard2 Device Tree

The Cubieboard2 is the successor of the first Cubieboard, and shares the
same hardware, except that the Allwinner A10 found initially has been
replaced by an Allwinner A20.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>