From patchwork Sun Mar 31 14:48:07 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shawn Guo X-Patchwork-Id: 2368521 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork1.kernel.org (Postfix) with ESMTP id 861DD3FD40 for ; Sun, 31 Mar 2013 14:51:21 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UMJYE-0005P4-Va; Sun, 31 Mar 2013 14:48:06 +0000 Received: from ch1ehsobe006.messaging.microsoft.com ([216.32.181.186] helo=ch1outboundpool.messaging.microsoft.com) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UMJYC-0005Of-HQ for linux-arm-kernel@lists.infradead.org; Sun, 31 Mar 2013 14:48:05 +0000 Received: from mail96-ch1-R.bigfish.com (10.43.68.248) by CH1EHSOBE020.bigfish.com (10.43.70.77) with Microsoft SMTP Server id 14.1.225.23; Sun, 31 Mar 2013 14:47:56 +0000 Received: from mail96-ch1 (localhost [127.0.0.1]) by mail96-ch1-R.bigfish.com (Postfix) with ESMTP id 8F956380165; Sun, 31 Mar 2013 14:47:53 +0000 (UTC) X-Forefront-Antispam-Report: CIP:70.37.183.190; KIP:(null); UIP:(null); IPV:NLI; H:mail.freescale.net; RD:none; EFVD:NLI X-SpamScore: 0 X-BigFish: VS0(zzzz1f42h1fc6h1ee6h1de0h1202h1e76h1d1ah1d2ahzz8275dhz2dh87h2a8h668h839hd24he5bhf0ah1288h12a5h12a9h12bdh12e5h137ah139eh13b6h1441h1504h1537h162dh1631h1758h1898h18e1h1946h19b5h1ad9h1b0ah1155h) X-FB-DOMAIN-IP-MATCH: fail Received: from mail96-ch1 (localhost.localdomain [127.0.0.1]) by mail96-ch1 (MessageSwitch) id 1364741271538913_13838; Sun, 31 Mar 2013 14:47:51 +0000 (UTC) Received: from CH1EHSMHS016.bigfish.com (snatpool1.int.messaging.microsoft.com [10.43.68.241]) by mail96-ch1.bigfish.com (Postfix) with ESMTP id 810C280066; Sun, 31 Mar 2013 14:47:51 +0000 (UTC) Received: from mail.freescale.net (70.37.183.190) by CH1EHSMHS016.bigfish.com (10.43.70.16) with Microsoft SMTP Server (TLS) id 14.1.225.23; Sun, 31 Mar 2013 14:47:51 +0000 Received: from tx30smr01.am.freescale.net (10.81.153.31) by 039-SN1MMR1-002.039d.mgd.msft.net (10.84.1.15) with Microsoft SMTP Server (TLS) id 14.2.328.11; Sun, 31 Mar 2013 14:47:50 +0000 Received: from S2101-09.ap.freescale.net ([10.192.185.206]) by tx30smr01.am.freescale.net (8.14.3/8.14.0) with ESMTP id r2VElmmu031881; Sun, 31 Mar 2013 07:47:49 -0700 From: Shawn Guo To: Subject: [PATCH] ARM: imx: do not use regmap_read for ANADIG_DIGPROG Date: Sun, 31 Mar 2013 22:48:07 +0800 Message-ID: <1364741287-25618-1-git-send-email-shawn.guo@linaro.org> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 X-OriginatorOrg: sigmatel.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130331_104804_676260_F38304D3 X-CRM114-Status: UNSURE ( 8.63 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -2.6 (--) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-2.6 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [216.32.181.186 listed in list.dnswl.org] -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: Shawn Guo 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 Function imx_anatop_get_digprog() that reads register ANADIG_DIGPROG is called to identify silicon version. Users might query silicon version earlier than regmap subsystem is ready. For example, imx6q clock driver query revision in mx6q_clocks_init(), where regmap is not initialized yet. Change imx_anatop_get_digprog() to map anatop block and read ANADIG_DIGPROG in the native way, so that the function can work at very early stage. Signed-off-by: Shawn Guo --- arch/arm/mach-imx/anatop.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/arch/arm/mach-imx/anatop.c b/arch/arm/mach-imx/anatop.c index 472beee..0cfa07d 100644 --- a/arch/arm/mach-imx/anatop.c +++ b/arch/arm/mach-imx/anatop.c @@ -78,10 +78,19 @@ void imx_anatop_usb_chrg_detect_disable(void) u32 imx_anatop_get_digprog(void) { - u32 val; + struct device_node *np; + void __iomem *anatop_base; + static u32 digprog; - regmap_read(anatop, ANADIG_DIGPROG, &val); - return val; + if (digprog) + return digprog; + + np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-anatop"); + anatop_base = of_iomap(np, 0); + WARN_ON(!anatop_base); + digprog = readl_relaxed(anatop_base + ANADIG_DIGPROG); + + return digprog; } void __init imx_anatop_init(void)