linux-kernel - Re: [PATCH] ARM: dts: msm8974: Move arch-timer out of soc node

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Message-ID: <5327316B.6040007@codeaurora.org>
Date:	Mon, 17 Mar 2014 13:31:23 -0400
From:	Christopher Covington <cov@...eaurora.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
CC:	David Brown <davidb@...eaurora.org>,
	Kumar Gala <galak@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: dts: msm8974: Move arch-timer out of soc node

Hi Stephen,

On 03/11/2014 05:24 PM, Stephen Boyd wrote:
> The architected timer is not a register addressable piece of
> hardware. Instead it's accessed through cp15 accessors. Move it
> to the root of the devicetree to reflect this.

I find this confusing, perhaps due to overloading of the word "register".
Aren't CP15's a class of coprocessor _registers_? Could it perhaps be clearer
to talk about memory-mapped versus CP15-mapped timers?

Is "soc" documented somewhere or is it just a name for a container? Assuming
the latter, it's not obvious to me why being a child of a system on chip node
would imply having memory mapped registers.

Thanks,
Christopher

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