Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753583Ab3FNRtq (ORCPT ); Fri, 14 Jun 2013 13:49:46 -0400 Received: from mail-pa0-f54.google.com ([209.85.220.54]:56655 "EHLO mail-pa0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753236Ab3FNRto (ORCPT ); Fri, 14 Jun 2013 13:49:44 -0400 Date: Fri, 14 Jun 2013 10:49:48 -0700 From: Olof Johansson To: Pawel Moll Cc: Lorenzo Pieralisi , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "devicetree-discuss@lists.ozlabs.org" , Nicolas Pitre , Jon Medhurst , Samuel Ortiz , Achin Gupta , Amit Kucheria Subject: Re: [RFC PATCH v3 2/2] drivers: mfd: vexpress: add Serial Power Controller (SPC) support Message-ID: <20130614174948.GA15759@quad.lixom.net> References: <1370512763-32200-1-git-send-email-lorenzo.pieralisi@arm.com> <1370512763-32200-3-git-send-email-lorenzo.pieralisi@arm.com> <20130613225233.GB22310@quad.lixom.net> <1371215040.3154.6.camel@hornet> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1371215040.3154.6.camel@hornet> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 963 Lines: 27 On Fri, Jun 14, 2013 at 02:04:00PM +0100, Pawel Moll wrote: > On Thu, 2013-06-13 at 23:52 +0100, Olof Johansson wrote: > > > + reg = <0 0x7FFF0000 0 0x1000>; > > > > #size-cells 2 on the parent bus? That's somewhat unusual. > > LPAE == 40 bit physical addresses == potential > 32 bit sizes (memory > blocks > 4GB) Yeah, I guess that's most commonly needed for the /memory nodes -- having devices with more than 4GB of register space is quite unusual. It doesn't really matter much, but it saves some padding of 0s if you pick a smaller value. I thought we used 2/1 for address/size-cells on PA Semi hardware, but I just checked and we had 2/2. Maybe it was Apple that used 2/1. Anyway, no big deal. -Olof -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/