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In the BL31 platform setup we read the Allwinner SoC ID to identify the
chip and print its name.
In addition to that we will need to differentiate the power setup
between the SoCs, to pass on the SoC ID to the PMIC setup routine.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>

Even though we initialise the platform part and the I2C controller
itself at boot time, we actually only access the bus on power down.
Meanwhile a rich OS might have configured the I2C pins differently or
even disabled the controller.
So repeat the platform setup and controller initialisation just before
we actually access the bus to power off the system. This is safe,
because at this point the rich OS should no longer be running.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>

Drop the unnecessary check for the I2C pins being already configured as
I2C pins (we actually don't care).
Also avoid resetting *every* peripheral that is covered by the PRCM reset
controller, instead just clear the one line connected to the I2C controller.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>

The AXP805 PMIC used with H6 is capable of shutting down the system.

Add support for using it to shut down the system power.

The original placeholder power off code is moved to A64 code, as it's
still TODO to implement PMIC operations for A64.
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>

The OTT reference design of Allwinner H6 SoC uses an X-Powers AXP805
PMIC.

Add initial code for it.

Currently it's only detected.
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>

As the ATF may need to do some power initialization on Allwinner
platform with AXP PMICs, call the PMIC setup code in BL31.

Stub of PMIC setup code is added, to prevent undefined reference.
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>