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From:   Kevin Hilman <khilman@baylibre.com>
To:     "shunzhou.jiang@amlogic.com" <shunzhou.jiang@amlogic.com>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        linux-amlogic <linux-amlogic@lists.infradead.org>,
        linux-kernel <linux-kernel@vger.kernel.org>
Cc:     Neil Armstrong <narmstrong@baylibre.com>,
        jbrunet <jbrunet@baylibre.com>,
        Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
        "jianxin.pan" <jianxin.pan@amlogic.com>
Subject: Re: Re: [PATCH 2/2] soc: s4: Add support for power domains controller
In-Reply-To: <2022021117375354230910@amlogic.com>
References: <20220126061018.705338-1-shunzhou.jiang@amlogic.com>
 <20220126061018.705338-3-shunzhou.jiang@amlogic.com>
 <7hzgnal5yu.fsf@baylibre.com> <202202091001287547451@amlogic.com>
 <7hee4bok8w.fsf@baylibre.com> <2022021117375354230910@amlogic.com>
Date:   Fri, 11 Feb 2022 10:52:41 -0800
Message-ID: <7hwni1me12.fsf@baylibre.com>
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Hi Shunzhou,

"shunzhou.jiang@amlogic.com" <shunzhou.jiang@amlogic.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