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Date: Mon, 6 Feb 2012 11:25:12 +0530
From: Viresh Kumar <viresh.kumar@st.com>
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Subject: Query: When will drv->poweroff() called
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Hi Guys,

Sorry for asking this silly question, but i couldn't locate much
help for it in documentation, so asking it.

We were testing hibernation for SPEAr13xx SoC family, based on
ARM Cortex a9.

I observed that poweroff() callback of individual drivers are not
getting called at all, while we test hibernate.

I tried to go through the code to see what happened. It looked like
there should be call to hibernation_set_ops() for platforms that are
willing to get a call to poweroff() for their drivers. Otherwise
shutdown of the busses gets called, which is a completely different path.

There are many drivers today, that are registering poweroff() from dev_pm_ops
but are not doing bus specific shutdown stuff.

Even i tried to look for hibernation_set_ops() in kernel, and only acpi
code is calling it. I didn't understood how other ARM Sub-Arch's are handling
this.

Thanks in advance :)

-- 
viresh