linux-kernel - Re: Re: [PATCH 2/2] soc: s4: Add support for power domains controller

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Message-ID: <7hwni1me12.fsf@baylibre.com>
Date:   Fri, 11 Feb 2022 10:52:41 -0800
From:   Kevin Hilman <khilman@...libre.com>
To:     "shunzhou.jiang@...ogic.com" <shunzhou.jiang@...ogic.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-amlogic <linux-amlogic@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        jbrunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        "jianxin.pan" <jianxin.pan@...ogic.com>
Subject: Re: Re: [PATCH 2/2] soc: s4: Add support for power domains controller

Hi Shunzhou,

"shunzhou.jiang@...ogic.com" <shunzhou.jiang@...ogic.com> writes:

> Hi Kevin:
> Thanks your kindly reply

You're welcome.  For future reference, please avoid top-posting.  See:
https://www.kernel.org/doc/html/latest/process/2.Process.html?highlight=top-posting#mailing-lists

> For those domains,  default is active, we hope not close when in use or not in use, in our case, 
> only runtime PM (include suspend) control this, so set always on flag to avoid domain shutdown,

my question remains: why do want to keep these powered on even when they
are not in use?

The goal of the power-domain framework + runtime PM is to be able to
save power by turnin off power domains when they are not in use.

> if you also have concern, we can control this not in kernel, but this not our expect.

My strong preference is that this is controlled by the kernel.

Kevin