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Add GPIO driver.

Change-Id: I8c35ce4ea247f3726081b0bbb95f0930c2b82517
Signed-off-by: kenny liang <kenny.liang@mediatek.com>

- Add PMIC driver
- Add RTC drvier
- Refactor PMIC and RTC to mediatek/common
- Implement system off handler

Change-Id: If76497646ace1b78bc9a5fa0110b652fe512281a
Signed-off-by: kenny liang <kenny.liang@mediatek.com>

- Add DCM driver
- Add SPMC driver
- Implement core and cluster power on/off handlers

Change-Id: I902002f8ea6f98fd73bf259188162b10d3939c72
Signed-off-by: kenny liang <kenny.liang@mediatek.com>

NOTE: __ASSEMBLY__ macro is now deprecated in favor of __ASSEMBLER__.

All common C compilers predefine a macro called __ASSEMBLER__ when
preprocessing a .S file. There is no reason for TF-A to define it's own
__ASSEMBLY__ macro for this purpose instead. To unify code with the
export headers (which use __ASSEMBLER__ to avoid one extra dependency),
let's deprecate __ASSEMBLY__ and switch the code base over to the
predefined standard.

Change-Id: Id7d0ec8cf330195da80499c68562b65cb5ab7417
Signed-off-by: Julius Werner <jwerner@chromium.org>

This consists of ensuring that the left operand of each shift is
unsigned when the operation might overflow into the sign bit.

Change-Id: If5a88e1b880bcb2be2278398cf5109a6d877e632
Signed-off-by: Justin Chadwell <justin.chadwell@arm.com>

add mcsi driver to support cache coherence.

Change-Id: I94f5922783e5dbc6b7e92aa06464bc1f0177f00a
Signed-off-by: kenny liang <kenny.liang@mediatek.com>