-----Original Message-----
From: Ulf Hansson [mailto:ulf.hansson at linaro.org]
Sent: Thursday, October 25, 2018 7:31 PM

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+ Jon

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In regards to model the HW correctly. I don't believe your HW
topology have each PWM block, GPIO block, etc, in their own gate-able

power domain, right?

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Or is it so?

First of all, thanks for your and Rob's good suggestions.
I spent a lot more time to do research to try to make it better
according to your suggestions. Some of your ideas absolutely helped me
a lot and gave me some inspirations.

Some new findings are that some of our power domains are organized in
a tree was because the kernel does not support multi-power domains for one

device.

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but from HW point of view, they're identical.
You can more serious situation from local tree at here:

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I just found your following patch perfectly addressed our issue as we
do have many Devices requires to handle multi power domains.
3c095f32a92b PM / Domains: Add support for multi PM domains per device
to genpd e.g. For LVDS devices, it need both LVDS and DC(Display controller)

PD to work.

Thanks for letting me know about further use cases about multiple PM domain
per device. Very interesting.

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Now i was trying to understand all of our current user case with the
team, If all of them do not need a tree to address dependency issue, I may

remove them all from device tree.

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Then it would be much more clearer than before and be something like what

Tegra does.

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include/dt-bindings/power/tegra186-powergate.h
drivers/soc/tegra/powergate-bpmp.c

Yes!

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For example, 1 #power-domain-cells will be enough. The first cell can
be a global SCU power domain and the 2nd cell the device ID.
Hopefully this can be what you and Rob want.

If any good suggestions please let me know.

It makes perfect sense!

In regards to deploy support for multiple PM domains per device, you may
have a look at the recent work done Jon Hunter for the Tegra xHCI genpd
support [1].

Thanks for sharing this info.
Will investigate it.

Regards
Dong Aisheng

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Kind regards
Uffe