From patchwork Wed Jan 6 18:31:51 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Hilman X-Patchwork-Id: 71371 Received: from devils.ext.ti.com (devils.ext.ti.com [198.47.26.153]) by demeter.kernel.org (8.14.3/8.14.2) with ESMTP id o06IaduD013994 for ; Wed, 6 Jan 2010 18:36:39 GMT Received: from dlep36.itg.ti.com ([157.170.170.91]) by devils.ext.ti.com (8.13.7/8.13.7) with ESMTP id o06IYteO001612 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 6 Jan 2010 12:34:55 -0600 Received: from linux.omap.com (localhost [127.0.0.1]) by dlep36.itg.ti.com (8.13.8/8.13.8) with ESMTP id o06IYt0q011704; Wed, 6 Jan 2010 12:34:55 -0600 (CST) Received: from linux.omap.com (localhost [127.0.0.1]) by linux.omap.com (Postfix) with ESMTP id BC0688062C; Wed, 6 Jan 2010 12:34:54 -0600 (CST) X-Original-To: davinci-linux-open-source@linux.davincidsp.com Delivered-To: davinci-linux-open-source@linux.davincidsp.com Received: from dflp51.itg.ti.com (dflp51.itg.ti.com [128.247.22.94]) by linux.omap.com (Postfix) with ESMTP id 6BD5280627 for ; Wed, 6 Jan 2010 12:32:37 -0600 (CST) Received: from neches.ext.ti.com (localhost [127.0.0.1]) by dflp51.itg.ti.com (8.13.7/8.13.7) with ESMTP id o06IWags010530 for ; Wed, 6 Jan 2010 12:32:37 -0600 (CST) Received: from psmtp.com (na3sys009amx196.postini.com [74.125.149.177]) by neches.ext.ti.com (8.13.7/8.13.7) with SMTP id o06IWaF5004809 for ; Wed, 6 Jan 2010 12:32:36 -0600 Received: from source ([209.85.216.189]) by na3sys009amx196.postini.com ([74.125.148.10]) with SMTP; Wed, 06 Jan 2010 13:32:36 EST Received: by mail-px0-f189.google.com with SMTP id 27so11130037pxi.4 for ; Wed, 06 Jan 2010 10:32:36 -0800 (PST) Received: by 10.114.6.8 with SMTP id 8mr2958393waf.73.1262802756012; Wed, 06 Jan 2010 10:32:36 -0800 (PST) Received: from localhost (deeprootsystems.com [216.254.16.51]) by mx.google.com with ESMTPS id 21sm17234136pzk.7.2010.01.06.10.32.35 (version=TLSv1/SSLv3 cipher=RC4-MD5); Wed, 06 Jan 2010 10:32:35 -0800 (PST) From: Kevin Hilman To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 09/35] davinci: explain CLOCK_TICK_RATE of 27MHz in include/mach/timex.h Date: Wed, 6 Jan 2010 10:31:51 -0800 Message-Id: <1262802737-6601-10-git-send-email-khilman@deeprootsystems.com> X-Mailer: git-send-email 1.6.6.rc2.1.g42108 In-Reply-To: <1262802737-6601-9-git-send-email-khilman@deeprootsystems.com> References: <1262802737-6601-1-git-send-email-khilman@deeprootsystems.com> <1262802737-6601-2-git-send-email-khilman@deeprootsystems.com> <1262802737-6601-3-git-send-email-khilman@deeprootsystems.com> <1262802737-6601-4-git-send-email-khilman@deeprootsystems.com> <1262802737-6601-5-git-send-email-khilman@deeprootsystems.com> <1262802737-6601-6-git-send-email-khilman@deeprootsystems.com> <1262802737-6601-7-git-send-email-khilman@deeprootsystems.com> <1262802737-6601-8-git-send-email-khilman@deeprootsystems.com> <1262802737-6601-9-git-send-email-khilman@deeprootsystems.com> X-pstn-neptune: 0/0/0.00/0 X-pstn-levels: (S:99.90000/99.90000 CV:99.9000 FC:95.5390 LC:95.5390 R:95.9108 P:95.9108 M:97.0282 C:98.6951 ) X-pstn-settings: 2 (0.5000:0.5000) s cv gt3 gt2 gt1 X-pstn-addresses: from [db-null] Cc: davinci-linux-open-source@linux.davincidsp.com X-BeenThere: davinci-linux-open-source@linux.davincidsp.com X-Mailman-Version: 2.1.12 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: davinci-linux-open-source-bounces@linux.davincidsp.com Errors-To: davinci-linux-open-source-bounces@linux.davincidsp.com diff --git a/arch/arm/mach-davinci/include/mach/timex.h b/arch/arm/mach-davinci/include/mach/timex.h index 5282756..9b88529 100644 --- a/arch/arm/mach-davinci/include/mach/timex.h +++ b/arch/arm/mach-davinci/include/mach/timex.h @@ -11,7 +11,12 @@ #ifndef __ASM_ARCH_TIMEX_H #define __ASM_ARCH_TIMEX_H -/* The source frequency for the timers is the 27MHz clock */ +/* + * Alert: Not all timers of the DaVinci family run at a frequency of 27MHz, + * but we should be fine as long as CLOCK_TICK_RATE or LATCH (see include/ + * linux/jiffies.h) are not used directly in code. Currently none of the + * code relevant to DaVinci platform depends on these values directly. + */ #define CLOCK_TICK_RATE 27000000 #endif /* __ASM_ARCH_TIMEX_H__ */