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sunxi: axp221: Add ELDO[1-3] support

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And also add Kconfig option for selecting ELDO3 voltage. The reason
for having this option is that the Android kernel sets ELDO3 to
1.2V when powering up LCD in the case if 'lcd_if' configuration
variable is set to 6 (LCD_IF_EXT_DSI) in the FEX file. Most likely
to supply power for a SSD2828 chip.

However on the MSI Primo81 tablet, which is using this particular
'lcd_if = 6' setup for LCD, setting the ELDO3 voltage appears to
be unnecessary and it works regardless. Having no schematics of
this tablet, I can only guess that 1.2V is supplied to SSD2828
in some other way.

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Siarhei Siamashka
2015-01-19 05:23:30 +02:00
committed by Hans de Goede
parent 6c46c8e890
commit 6906df1ab8
4 changed files with 51 additions and 0 deletions
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10
drivers/power/Kconfig
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@@ -63,3 +63,13 @@ config AXP221_ALDO3_VOLT
Set the voltage (mV) to program the axp221 aldo3 at, set to 0 to
disable aldo3. This is typically connected to VCC-PLL and AVCC and
must be set to 3V.
config AXP221_ELDO3_VOLT
int "axp221 eldo3 voltage"
depends on AXP221_POWER
default 0
---help---
Set the voltage (mV) to program the axp221 eldo3 at, set to 0 to
disable eldo3. On some A31(s) tablets it might be used to supply
1.2V for the SSD2828 chip (converter of parallel LCD interface
into MIPI DSI).