On Thu, Dec 2, 2021 at 8:36 AM Andreas Kemnade [off-list ref] wrote:

Hi,

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This is a vcom in the sense of voltage for compensation. We just
currently don't support setting the vcom.

I had a look at the Kobo code and this is similar to
https://github.com/akemnade/linux/blob/kobo/epdc-pmic-5.15/drivers/regulator/sy7636-regulator.c#L614

So I think that vcom is still the appropriate name for this.

seems that you did not get me. If I understand the code behind it
correctly, it turns on all power rails (the +-15V stuff, VEE and so on)
with the defined delays, not just vcom because it sets
SY7636A_OPERATION_MODE_CRL_ONOFF. Controlling VCOM separately is possible
by using SY7636A_OPERATION_MODE_CRL_VCOMCTL in combintion with a
vcom_en gpio.

I do not see a reason to turn on vcom only without the other higher
voltage rails, so the behaviour is not necessarily wrong but if I read
the binding documentation I would expect that just vcom is turned on.
That is the mismatch I am talking about.

Ah! Ok I understand. I'll rename it to vdd then.

Most important is IMHO some human-readable description in the bindings
document.

That is what I ended up going with instead.

Alistair

I am also just wondering whether this kind of logical
regulator which turns on several other regulators is actually accepted
or just slipped through review. I have no strong opinion here. I just
want to be able to clean up the tps65185 driver in the same way and not
having two similar pmics with different bindings and then a mess at the
consumer side.

Regards,
Andreas