From patchwork Thu Nov 14 19:10:42 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tim Kryger X-Patchwork-Id: 3184821 Return-Path: X-Original-To: patchwork-linux-arm@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 DB1F9C045B for ; Thu, 14 Nov 2013 19:14:43 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id E2DFD208D3 for ; Thu, 14 Nov 2013 19:14:42 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E412D207D6 for ; Thu, 14 Nov 2013 19:14:41 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Vh2Lc-0007uQ-7Y; Thu, 14 Nov 2013 19:13:01 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Vh2LB-0001mO-7R; Thu, 14 Nov 2013 19:12:33 +0000 Received: from mms2.broadcom.com ([216.31.210.18]) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Vh2KK-0001em-5J for linux-arm-kernel@lists.infradead.org; Thu, 14 Nov 2013 19:11:45 +0000 Received: from [10.9.208.55] by mms2.broadcom.com with ESMTP (Broadcom SMTP Relay (Email Firewall v6.5)); Thu, 14 Nov 2013 11:10:33 -0800 X-Server-Uuid: 4500596E-606A-40F9-852D-14843D8201B2 Received: from IRVEXCHSMTP3.corp.ad.broadcom.com (10.9.207.53) by IRVEXCHCAS07.corp.ad.broadcom.com (10.9.208.55) with Microsoft SMTP Server (TLS) id 14.1.438.0; Thu, 14 Nov 2013 11:11:00 -0800 Received: from mail-sj1-12.sj.broadcom.com (10.10.10.20) by IRVEXCHSMTP3.corp.ad.broadcom.com (10.9.207.53) with Microsoft SMTP Server id 14.1.438.0; Thu, 14 Nov 2013 11:11:00 -0800 Received: from mps-infra-lab3.broadcom.com ( mps-infra-lab3.sj.broadcom.com [10.19.114.109]) by mail-sj1-12.sj.broadcom.com (Postfix) with ESMTP id E8059207D8; Thu, 14 Nov 2013 11:10:58 -0800 (PST) Received: by mps-infra-lab3.broadcom.com (Postfix, from userid 1004) id BF39F4589FB; Thu, 14 Nov 2013 11:10:58 -0800 (PST) From: "Tim Kryger" To: "Christian Daudt" , "Rob Herring" , "Pawel Moll" , "Mark Rutland" , "Stephen Warren" , "Ian Campbell" , "Daniel Lezcano" , "Thomas Gleixner" , "Chris Ball" Subject: [PATCH v3 7/8] clocksource: kona: Add basic use of external clock Date: Thu, 14 Nov 2013 11:10:42 -0800 Message-ID: <1384456243-27053-8-git-send-email-tim.kryger@linaro.org> X-Mailer: git-send-email 1.8.0.1 In-Reply-To: <1384456243-27053-1-git-send-email-tim.kryger@linaro.org> References: <1384456243-27053-1-git-send-email-tim.kryger@linaro.org> MIME-Version: 1.0 X-WSS-ID: 7E9BFFA34RS8193360-01-01 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20131114_141140_545030_AAA1B751 X-CRM114-Status: GOOD ( 13.18 ) X-Spam-Score: -4.2 (----) Cc: Device Tree List , Linaro Patches List , Tim Kryger , Linux MMC List , Linux Kernel Mailing List , Linux ARM Kernel List X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, 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 When an clock is specified in the device tree, enable it and use it to determine the external clock frequency. Signed-off-by: Tim Kryger Reviewed-by: Markus Mayer Reviewed-by: Matt Porter --- drivers/clocksource/bcm_kona_timer.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/drivers/clocksource/bcm_kona_timer.c b/drivers/clocksource/bcm_kona_timer.c index 0d7d8c3..8a4ab36 100644 --- a/drivers/clocksource/bcm_kona_timer.c +++ b/drivers/clocksource/bcm_kona_timer.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include @@ -107,11 +108,18 @@ static const struct of_device_id bcm_timer_ids[] __initconst = { static void __init kona_timers_init(struct device_node *node) { u32 freq; + struct clk *external_clk; - if (!of_property_read_u32(node, "clock-frequency", &freq)) + external_clk = of_clk_get_by_name(node, NULL); + + if (!IS_ERR(external_clk)) { + arch_timer_rate = clk_get_rate(external_clk); + clk_prepare_enable(external_clk); + } else if (!of_property_read_u32(node, "clock-frequency", &freq)) { arch_timer_rate = freq; - else - panic("clock-frequency not set in the .dts file"); + } else { + panic("unable to determine clock-frequency"); + } /* Setup IRQ numbers */ timers.tmr_irq = irq_of_parse_and_map(node, 0);