From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751582AbbBPUal (ORCPT ); Mon, 16 Feb 2015 15:30:41 -0500 Received: from mail-lb0-f170.google.com ([209.85.217.170]:42187 "EHLO mail-lb0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751021AbbBPUaj (ORCPT ); Mon, 16 Feb 2015 15:30:39 -0500 MIME-Version: 1.0 In-Reply-To: References: <1421269101-51105-1-git-send-email-s-anna@ti.com> <1421269101-51105-2-git-send-email-s-anna@ti.com> <20150115135201.GG16217@leverpostej> <20150115135556.GH16217@leverpostej> <20150116101746.GA21809@leverpostej> Date: Mon, 16 Feb 2015 12:30:37 -0800 Message-ID: Subject: Re: [PATCH v7 1/4] Documentation: dt: add common bindings for hwspinlock From: Bjorn Andersson To: Ohad Ben-Cohen Cc: Mark Rutland , Rob Herring , Suman Anna , Kumar Gala , "devicetree@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-omap@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , Rob Herring Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jan 30, 2015 at 9:41 PM, Ohad Ben-Cohen wrote: [..] > Since the existence of several hwblocks is still fictional (Bjorn, > please confirm too?), we may prefer to introduce changes to support it > only when it shows up; it all depends on the amount of changes needed. > Suman, care to take a look please? > It turns out that the Qualcomm platforms have two additional "remote spinlock" mechanisms - both using shared memory. On most platforms only 1 (out of these 3) is actually consumed, but e.g. the older msm7x30 uses 2 of them (SMEM and DAL). Due to its age I don't think it's on anyones todo list to actually support this platform as of today; but it's out there. None of these hwlocks are allocated dynamically, so if needed a dynamic base_id (-1 like other frameworks) would be a acceptable solution - and can easily be implemented when we need it. Regards, Bjorn