sunxi: axp221: Add Kconfig help and sane defaults for typical ldo usage

[karo-tx-uboot.git] / drivers / power / Kconfig

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 7373a793e2552295d56a5e914c6d997a6cf7ba8a..af668871291ce924e69cf8529247ecc21bdc0a03 100644 (file)
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -12,7 +12,9 @@ config AXP221_DLDO1_VOLT
        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 @@ config AXP221_ALDO1_VOLT
        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.