linux-kernel - Re: [PATCH V2] ARM: dove: dt: revert PMU interrupt controller node

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Date:	Mon, 3 Mar 2014 15:02:15 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Jason Cooper <jason@...edaemon.net>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Andrew Lunn <andrew@...n.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...glemail.com>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V2] ARM: dove: dt: revert PMU interrupt controller node

On Mon, Feb 17, 2014 at 08:00:36PM +0000, Jason Cooper wrote:
> The corresponding driver didn't make it into v3.14, so we need to remove
> the node.  Dove systems fail to boot with the node present and no
> driver.
> 
> This node will be re-added when the driver makes it to mainline.

I'm going to stick my oar in on this and ask what is a very fundamental
question.

If we're adding the PMU interrupt controller as a separate "device"
aren't we describing our implementation rather than the hardware?  It
isn't a separate device as far as the description of it in the reference
manuals.

Moreover, should the PMU interrupt controller be something which is
handled by a separate chunk of code to a driver for the PMU as a whole,
or are we storing up problems with resource clashes?  I can quite see
a PMU driver coming along in the future offering a pair of generic
power domains for the GPU and VPU, and such a driver would need to map
all the PMU registers so it can access the power control, reset and
isolator registers.

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