[U-Boot] [PATCH 0/8] Stop AXP from crashing when enabeling LDO3

[Olliver Schinagl]

Hey Maxime, Jagan,

On 01-03-17 14:00, Maxime Ripard wrote:
> Hi Oliver,
>
> On Wed, Mar 01, 2017 at 01:52:16PM +0100, Olliver Schinagl wrote:
>> Hi list,
>>
>> When powering up an AXP209, the default value for LDO3 output is enabled. This
>> works fine. However if for whatever reason, LDO3 is disabled, for example by OS
>> during reboot and u-boot enables LDO3 again, the PMIC shutsdown (without
>> setting an interrupt) causing the board to hang. This behavior has been seen
>> from Linux as well, u-boot disables LDO3 as a default value, the kernel enables
>> it per its DTS, the kernel hangs as the PMIC gets shut down.
>>
>> The root cause is that some boards have to high capacitance on the LDO3 output
>> port causing inrush currents exceeding the maximum of the AXP209.
>>
>> The fix is to turn on the LDO3 at the lowest possible voltage and then set the
>> final voltage.
>>
>> If the capacitance is really big (due to a connected device for example) the
>> AXP209 also features VRC, or Voltage Rate Control, which allows the voltage
>> ramp up to be even slower.
>>
>> This patch series implements the above with a few tiny, cleanups I ran into
>> underway.
>>
>> The initial discussion with some scope screenshots can be found in the
>> linux-sunxi mailing list [0].
>
> If you don't CC the proper maintainers, no one is going to pick the patches.

Appologies, I did check the u-boot page, where sunxi is still listed as 
orphaned and the AXP stuff does not show up with the sunxi maintainers.

@Jagan, do you wish for me to resend the series, or can you see them via 
the linux-sunxi list?

Olliver

>
> Maxime
>