[U-Boot] [PATCH 4/7] sunxi: power: Change A23/A33 VDD-SYS default from 1.2V to 1.1V

[Hans de Goede]

Hi,

On 10-10-15 16:13, Chen-Yu Tsai wrote:
> On Sat, Oct 3, 2015 at 10:26 PM, Hans de Goede <hdegoede at redhat.com> wrote:
>> Change the axp223 dcdc2 / VDD-SYS default from 1.2V to 1.1V, 1.1V is the
>> value recommended by Allwinner and is what most fex files specify.
>>
>> This has been tested on a number of A23/A33 tablets including on an
>> A23 Ippo-q8h-v1.2 PCB tablet which has a fex file which specifies 1.2V
>> (which is where our original 1.2V default comes from).
>>
>> Signed-off-by: Hans de Goede <hdegoede at redhat.com>
>
> We should also be able to drop the VDD-SYS voltage for A31/A31s, which is
> from DCDC4, as well.

The fex files do not agree with you all A31 fex files have it at either
1200 or 1240 mV.

> Furthermore, DCDC2 on AXP221/sun6i is normally powering the GPU,
> in spite of the reference design using it for the CPU.

Right, the Kconfig help for DCDC2 already contains:

         On A31 boards dcdc2 is used for VDD-GPU and should be 1.2V.

Regards,

Hans