sun6i: Add basic axp221 driver
The A31 uses the AXP221 pmic for various voltages.
Signed-off-by: Oliver Schinagl <[email protected]>
Signed-off-by: Hans de Goede <[email protected]>
Acked-by: Ian Campbell <[email protected]>
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Changes in v2:
-Rebase
Changes in v3:
-Add support for all dldo and aldo-s
-Add Kconfig option to select building AXP221 and to select voltage of
dldo and aldo-s
Changes in v4:
-Add axp221_setbits helper function
-Use symbolic names for enabled bits in CTRL1 - CTRL3 registers
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