Il 04/08/25 16:21, Krzysztof Kozlowski ha scritto:

On 04/08/2025 16:15, AngeloGioacchino Del Regno wrote:

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Il 04/08/25 15:58, Krzysztof Kozlowski ha scritto:

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On 04/08/2025 15:27, AngeloGioacchino Del Regno wrote:

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We discussed about aggregating votes, yes, in software - this instead is a
*broken* hardware that does the aggregation internally and does not require
nor want external drivers to do the aggregation.

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Maybe it is just the name, so avoid all the confusing "votes" if this is
not voting system. If this is a voting system, then don't use custom
phandles.

Being it fundamentally *broken*, this being a voting system is what the hardware
initially wanted to be - but effectively, since it requires YOU to:
    - Make sure that power supplies are turned on, if not, turn them on by "touching"
      HW registers (so, without any assistance from the voter MCU), if any;
    - Turn on parent clocks manually, if any, before using the "voter mcu" to try
      to ungate that clock; and
      - Enable the "FENC" manually, after the mcu says that the clock was ungated.

I understand that "YOU" as Linux driver, when you want to do something
(e.g. toggle) a clock?

"you" == Linux driver, yes.

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If so this looks a lot like power domain, although with some differences.

A power domain ungates power to something.

Does more, it is not a simple supply.

Yes, does more, but still manages power, and not clocks.

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These are clocks, giving a (x) (M)Hz signal to something.

Your earlier message about "YOU" said:

"   - Make sure that power supplies are turned on, if not, turn them on
by "touching"
      HW registers (so, without any assistance from the voter MCU), if any;"

so not a simple clocks stuff.

That's a characteristic of MediaTek's clock controllers: each hardware macroblock
needs to be powered in order to be able to enable clocks.

This is nothing new in MT8196/MT6991, it's how MediaTek SoCs have always been split
by hardware, and it's like that since ages.

Some other SoCs have the clock controllers always powered on - MediaTek doesn't.