linux-kernel - Re: [PATCH RFC v4 1/3] PM / Runtime: Add an API pm_runtime_set

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Date:	Mon, 9 Feb 2015 10:58:41 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Amit Daniel Kachhap <amit.daniel@...sung.com>
cc:	linux-pm@...r.kernel.org, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-samsung-soc@...r.kernel.org>, <khilman@...aro.org>,
	<rjw@...ysocki.net>, <len.brown@...el.com>,
	<ulf.hansson@...aro.org>, <tomasz.figa@...il.com>,
	<kgene.kim@...sung.com>, <s.nawrocki@...sung.com>,
	<thomas.ab@...sung.com>, <pankaj.dubey@...sung.com>,
	<m.szyprowski@...sung.com>, <geert+renesas@...der.be>
Subject: Re: [PATCH RFC v4 1/3] PM / Runtime: Add an API pm_runtime_set_slave

On Mon, 9 Feb 2015, Amit Daniel Kachhap wrote:

> This API creates a pm runtime slave type device which does not itself
> participates in pm runtime but depends on the master devices to power
> manage them.

This makes no sense.  How can a master device manage a slave device?  
Devices are managed by drivers, not by other devices.

>  These devices should have pm runtime callbacks.
> 
> These devices (like clock) may not implement complete pm_runtime calls
> such as pm_runtime_get/pm_runtime_put due to subsystems interaction
> behaviour or any other reason.
> 
> Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
> ---
>  drivers/base/power/runtime.c | 18 ++++++++++++++++++
>  include/linux/pm.h           |  1 +
>  include/linux/pm_runtime.h   |  2 ++
>  3 files changed, 21 insertions(+)

This patch is unacceptable because it does not update the runtime PM 
documentation file.

Besides, doesn't the no_callbacks flag already do more or less what you 
want?

Alan Stern

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