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

[Icenowy Zheng]

01.03.2017, 21:45, "Olliver Schinagl" <o.schinagl at ultimaker.com>:
> Hey Maxime,
>
> 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.
>
> who did I miss? I did use the get_maintainers script, and added you
> explicitly.
>
> There is no sunxi custodian anymore, it is orphaned.

Currently maintainers are Maxime Ripard and Jegan Teki.

>
>>  Maxime
>
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