sunxi: axp221: Add Kconfig help and sane defaults for typical ldo usage
Some of the ldo-s of the axp221 are used in the same way on most boards, add
comments to the Kconfig help text to reflect this, and give them defaults
matching their typical usage.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 7373a79..af66887 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -12,7 +12,9 @@
default -1
---help---
Set the voltage (mV) to program the axp221 dldo1 at, set to -1 to
- disable dldo1.
+ disable dldo1. On sun6i (A31) boards with ethernet this is often used
+ to power the ethernet phy. On sun8i (A23) boards this is often used to
+ power the wifi.
config AXP221_DLDO4_VOLT
int "axp221 dldo4 voltage"
@@ -28,20 +30,26 @@
default -1
---help---
Set the voltage (mV) to program the axp221 aldo1 at, set to -1 to
- disable aldo1.
+ disable aldo1. On sun6i (A31) boards which have a wifi module this is
+ often used to power the wifi module.
config AXP221_ALDO2_VOLT
int "axp221 aldo2 voltage"
depends on AXP221_POWER
- default -1
+ default 1800 if MACH_SUN6I
+ default 2500 if MACH_SUN8I
---help---
Set the voltage (mV) to program the axp221 aldo2 at, set to -1 to
- disable aldo2.
+ disable aldo2. On sun6i (A31) boards this is typically connected to
+ VCC-PM, which powers the port M gpios, and should be set to 1.8V.
+ On sun8i (A23) this is typically connected to VDD-DLL and must be
+ set to 2.5V.
config AXP221_ALDO3_VOLT
int "axp221 aldo3 voltage"
depends on AXP221_POWER
- default -1
+ default 3000
---help---
Set the voltage (mV) to program the axp221 aldo3 at, set to -1 to
- disable aldo3.
+ disable aldo3. This is typically connected to VCC-PLL and AVCC and
+ must be set to 3V.