From patchwork Mon Apr 28 04:10:24 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: George Cherian X-Patchwork-Id: 4074851 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id A31899F169 for ; Mon, 28 Apr 2014 04:16:07 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C9D8F201BC for ; Mon, 28 Apr 2014 04:16:06 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E555920166 for ; Mon, 28 Apr 2014 04:16:05 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WecxC-0003MA-CG; Mon, 28 Apr 2014 04:14:06 +0000 Received: from devils.ext.ti.com ([198.47.26.153]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Wecwq-00033S-Fi for linux-arm-kernel@lists.infradead.org; Mon, 28 Apr 2014 04:13:45 +0000 Received: from dflxv15.itg.ti.com ([128.247.5.124]) by devils.ext.ti.com (8.13.7/8.13.7) with ESMTP id s3S4D4rN009829; Sun, 27 Apr 2014 23:13:04 -0500 Received: from DLEE70.ent.ti.com (dlemailx.itg.ti.com [157.170.170.113]) by dflxv15.itg.ti.com (8.14.3/8.13.8) with ESMTP id s3S4D4NT007538; Sun, 27 Apr 2014 23:13:04 -0500 Received: from dlep33.itg.ti.com (157.170.170.75) by DLEE70.ent.ti.com (157.170.170.113) with Microsoft SMTP Server id 14.3.174.1; Sun, 27 Apr 2014 23:13:04 -0500 Received: from george-pc.apr.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dlep33.itg.ti.com (8.14.3/8.13.8) with ESMTP id s3S4CFdx031512; Sun, 27 Apr 2014 23:12:57 -0500 From: George Cherian To: , , , , Subject: [PATCH 5/6] ARM: AM43xx: clk: Change the cpts ref clock source to dpll_core_m5 clk Date: Mon, 28 Apr 2014 09:40:24 +0530 Message-ID: <1398658225-25873-6-git-send-email-george.cherian@ti.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1398658225-25873-1-git-send-email-george.cherian@ti.com> References: <1398658225-25873-1-git-send-email-george.cherian@ti.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140427_211344_769882_8A33F713 X-CRM114-Status: UNSURE ( 8.62 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -5.7 (-----) Cc: mark.rutland@arm.com, tony@atomide.com, ast@plumgrid.com, mturquette@linaro.org, jeffrey.t.kirsher@intel.com, tklauser@distanz.ch, mugunthanvnm@ti.com, george.cherian@ti.com, pawel.moll@arm.com, ijc+devicetree@hellion.org.uk, richardcochran@gmail.com, robh+dt@kernel.org, bhutchings@solarflare.com, linux@arm.linux.org.uk, balbi@ti.com, zonque@gmail.com, t-kristo@ti.com, dborkman@redhat.com, bcousson@baylibre.com, galak@codeaurora.org, mpa@pengutronix.de, davem@davemloft.net 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=-2.5 required=5.0 tests=BAYES_00,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 cpsw_cpts_rft_clk has got the choice of 3 clocksources -dpll_core_m4_ck -dpll_core_m5_ck -dpll_disp_m2_ck By default dpll_core_m4_ck is selected, witn this as clock source the CPTS doesnot work properly. It gives clockcheck errors while running PTP. clockcheck: clock jumped backward or running slower than expected! By selecting dpll_core_m5_ck as the clocksource fixes this issue. In AM335x dpll_core_m5_ck is the default clocksource. Signed-off-by: George Cherian --- drivers/clk/ti/clk-43xx.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/clk/ti/clk-43xx.c b/drivers/clk/ti/clk-43xx.c index 67c8de5..b4877e0 100644 --- a/drivers/clk/ti/clk-43xx.c +++ b/drivers/clk/ti/clk-43xx.c @@ -110,9 +110,25 @@ static struct ti_dt_clk am43xx_clks[] = { int __init am43xx_dt_clk_init(void) { + struct clk *clk1, *clk2; + ti_dt_clocks_register(am43xx_clks); omap2_clk_disable_autoidle_all(); + /* + * cpsw_cpts_rft_clk has got the choice of 3 clocksources + * dpll_core_m4_ck, dpll_core_m5_ck and dpll_disp_m2_ck. + * By default dpll_core_m4_ck is selected, witn this as clock + * source the CPTS doesnot work properly. It gives clockcheck errors + * while running PTP. + * clockcheck: clock jumped backward or running slower than expected! + * By selecting dpll_core_m5_ck as the clocksource fixes this issue. + * In AM335x dpll_core_m5_ck is the default clocksource. + */ + clk1 = clk_get_sys(NULL, "cpsw_cpts_rft_clk"); + clk2 = clk_get_sys(NULL, "dpll_core_m5_ck"); + clk_set_parent(clk1, clk2); + return 0; }