Mark Brown [off-list ref] 於 2020年8月25日 週二 下午6:08寫道：

On Tue, Aug 25, 2020 at 06:01:46PM +0800, Gene Chen wrote:

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Mark Brown [off-list ref] 於 2020年8月25日 週二 下午5:34寫道：

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LDO_VINx is HW design layout, so actually it can't be changed by device tree.
LDO_VIN1/LDO_VIN2 supply from VSYS, not regulator, so I think usually
not to show the supply from in device tree.
or I should declare a dummy reference to system power like "*-supply =
<&system_power>;"?

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When you say it's from the hardware design do you mean it's fixed by the
silicon or is this something that's fixed in the board?

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fixed in the board, not silicon.

Ah, if it's fixed by the board that's exactly the sort of thing that
should be in DT - the DT describes the board so if some other system has
a different configuration then it will have a different DT.  With supply
properties you can just leave them missing in the DT, you're not
supposed to but so many systems do it that the framework will handle it.
Otherwise if you want to represent VSYS you can have a fixed voltage
regulator with no control and hook them up to it.

ok, I think I will follow the framework to handle it.
I will add supply description in devicetree
  LDO_VIN1-supply:
    description: Input supply phandle(s) for LDO1/2/3 which is supply from VSYS
  LDO_VIN2-supply:
    description: Input supply phandle(s) for LDO5 which is supply from
VSYS
  LDO_VIN3-supply:
    description: Input supply phandle(s) for LDO6/7

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