[PATCH 1/5] arm: mxs: Provide Kconfig option to to not use VDD5V as IMX28 PMU source

Marek Vasut marex at denx.de
Tue May 9 17:51:02 CEST 2023

On 5/9/23 17:04, Lukasz Majewski wrote:
> Hi Marek,
>> On 5/9/23 16:46, Lukasz Majewski wrote:
>>> Hi Marek,
>> Hi,
>>>> On 5/9/23 16:32, Lukasz Majewski wrote:
>>>>> This option sets the current limit for 5V source to zero, so all
>>>>> the PMU outputs are primarily powered from battery source
>>>>> (DCDC_BAT).
>>>>> This option may be set on systems, where the 5V is NOT supposed to
>>>>> be in any scenario powering the system - for example on systems
>>>>> where DCDC_BAT is connected to fixed and regulated 4.2V source (so
>>>>> the "battery" is not present).
>>>> Is it possible to dig this information out of DT or is the DT not
>>>> available in SPL for this platform ?
>>> This platform uses only SPL_OF_PLATDATA to keep the SPL size < 40
>>> KiB.
>>> I would prefer to keep this as Kconfig as the PMU driver is not
>>> supporting DT and in fact now ARCH_MX28 only has two boards
>>> supported - XEA and imx28evk.
>> Why not use the platdata then ?
>> This makes it far better, as the code is actually always compiled and
>> doesn't start to bitrot.
> As fair as I can tell - the MX28 PMU driver in SPL is not supporting
> OF_PLATDATA. Or have I overlooked something?
> I would like to investigate the PMU issue, and avoid extra work to
> provide platdata support for two supported imx287 based boards.

Hum, considering that this platform is basically legacy and winding 
down, I guess that's OK too.

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