From patchwork Fri Feb 7 10:21:26 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lokesh Vutla X-Patchwork-Id: 3600841 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 83558BF418 for ; Fri, 7 Feb 2014 10:22:44 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 7A2232010B for ; Fri, 7 Feb 2014 10:22:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 375B02012B for ; Fri, 7 Feb 2014 10:22:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752254AbaBGKWb (ORCPT ); Fri, 7 Feb 2014 05:22:31 -0500 Received: from devils.ext.ti.com ([198.47.26.153]:45392 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752046AbaBGKWC (ORCPT ); Fri, 7 Feb 2014 05:22:02 -0500 Received: from dflxv15.itg.ti.com ([128.247.5.124]) by devils.ext.ti.com (8.13.7/8.13.7) with ESMTP id s17ALeTP025661; Fri, 7 Feb 2014 04:21:40 -0600 Received: from DFLE72.ent.ti.com (dfle72.ent.ti.com [128.247.5.109]) by dflxv15.itg.ti.com (8.14.3/8.13.8) with ESMTP id s17ALeic017015; Fri, 7 Feb 2014 04:21:40 -0600 Received: from dflp32.itg.ti.com (10.64.6.15) by DFLE72.ent.ti.com (128.247.5.109) with Microsoft SMTP Server id 14.2.342.3; Fri, 7 Feb 2014 04:21:39 -0600 Received: from a0131933lt.apr.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dflp32.itg.ti.com (8.14.3/8.13.8) with ESMTP id s17ALQ8p028767; Fri, 7 Feb 2014 04:21:38 -0600 From: Lokesh Vutla To: CC: , , , , , , Subject: [PATCH V2 4/4] ARM: OMAP2+: AM43x: Use gptimer as clocksource Date: Fri, 7 Feb 2014 15:51:26 +0530 Message-ID: <1391768486-2134-5-git-send-email-lokeshvutla@ti.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1391768486-2134-1-git-send-email-lokeshvutla@ti.com> References: <1391768486-2134-1-git-send-email-lokeshvutla@ti.com> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Rajendra Nayak The SyncTimer in AM43x is clocked using the following two sources: 1) An inaccuarte 32k clock (CLK_32KHZ) derived from PER DPLL, causing system time to go slowly (~10% deviation). 2) external 32KHz RTC clock, which may not always be available on board like in the case of ePOS EVM Use gptimer as clocksource instead, as is done in the case of AM335x (which does not have a SyncTimer). With this, system time keeping works accurately. Signed-off-by: Rajendra Nayak Signed-off-by: Lokesh Vutla --- arch/arm/mach-omap2/board-generic.c | 2 +- arch/arm/mach-omap2/timer.c | 3 ++- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/arm/mach-omap2/board-generic.c b/arch/arm/mach-omap2/board-generic.c index 8e3daa1..5679464a 100644 --- a/arch/arm/mach-omap2/board-generic.c +++ b/arch/arm/mach-omap2/board-generic.c @@ -229,7 +229,7 @@ DT_MACHINE_START(AM43_DT, "Generic AM43 (Flattened Device Tree)") .init_late = am43xx_init_late, .init_irq = omap_gic_of_init, .init_machine = omap_generic_init, - .init_time = omap3_sync32k_timer_init, + .init_time = omap3_gptimer_timer_init, .dt_compat = am43_boards_compat, MACHINE_END #endif diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c index 74044aa..b62de9f 100644 --- a/arch/arm/mach-omap2/timer.c +++ b/arch/arm/mach-omap2/timer.c @@ -604,7 +604,8 @@ OMAP_SYS_32K_TIMER_INIT(3_secure, 12, "secure_32k_fck", "ti,timer-secure", 2, "timer_sys_ck", NULL); #endif /* CONFIG_ARCH_OMAP3 */ -#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM33XX) +#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_SOC_AM33XX) || \ + defined(CONFIG_SOC_AM43XX) OMAP_SYS_GP_TIMER_INIT(3, 2, "timer_sys_ck", NULL, 1, "timer_sys_ck", "ti,timer-alwon"); #endif