power: regulator: add AXP318W support

The PMIC is also known as AXP819 in vendor pmu code

For DCDC6, 8, 9, the underlying hardware support more than two levels
voltage step tuning, but for now only first two levels are implemented
in this driver, hence highest voltage will be limited at seccond level.
It actual meets board requirement in current design, and we've verified
it in Radxa Cubie A7A board.

Following are detail explanation of voltage tuning stpes for those DCDCs:

DCDC | voltage range  | units | steps | implemented
 6   | 0.5   -  1.2   | 10 mV | 71    | Y
 .   | 1.22  -  1.54  | 20 mV | 17    | Y
 .   | 1.8   -  2.4   | 20 mV | 31    | N
 .   | 2.44  -  2.76  | 40 mV | 9     | N
 --------------------------------------------------
 8/9 | 0.5   -  1.2   | 10 mV | 71    | Y
 .   | 1.22  -  1.84  | 20 mV | 32    | Y
 .   | 1.9   -  3.4   | 100mV | 16    | N

Signed-off-by: Yixun Lan <[email protected]>
Reviewed-by: Andre Przywara <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/axp_pmic.h b/include/axp_pmic.h
index 1806a7270a0..2f547da74c2 100644
--- a/include/axp_pmic.h
+++ b/include/axp_pmic.h
@@ -39,6 +39,7 @@ enum {
 	AXP806_ID,
 	AXP809_ID,
 	AXP813_ID,
+	AXP318_ID,
 };
 
 int axp_set_dcdc1(unsigned int mvolt);