From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932389AbaCQRdy (ORCPT ); Mon, 17 Mar 2014 13:33:54 -0400 Received: from smtp.codeaurora.org ([198.145.11.231]:35549 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755233AbaCQRdv convert rfc822-to-8bit (ORCPT ); Mon, 17 Mar 2014 13:33:51 -0400 Content-Type: text/plain; charset=windows-1252 Mime-Version: 1.0 (Mac OS X Mail 7.2 \(1874\)) Subject: Re: [PATCH] ARM: dts: msm8974: Move arch-timer out of soc node From: Kumar Gala In-Reply-To: <5327316B.6040007@codeaurora.org> Date: Mon, 17 Mar 2014 12:33:40 -0500 Cc: Stephen Boyd , David Brown , "linux-kernel@vger.kernel.org" , "linux-arm-msm@vger.kernel.org" , linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: 8BIT Message-Id: <26E59402-2F50-4E42-AAF2-AF321CB51799@codeaurora.org> References: <1394573058-18561-1-git-send-email-sboyd@codeaurora.org> <5327316B.6040007@codeaurora.org> To: Christopher Covington X-Mailer: Apple Mail (2.1874) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mar 17, 2014, at 12:31 PM, Christopher Covington wrote: > 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. “soc” is a container, since its compatible = "simple-bus”, this implies memory mapped register access for nodes inside of it. - k -- Employee of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation