From patchwork Mon Jul 29 09:44:22 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonas Jensen X-Patchwork-Id: 2834869 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 E27E4C0319 for ; Mon, 29 Jul 2013 09:45:18 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B102F2025A for ; Mon, 29 Jul 2013 09:45:17 +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 8F59820254 for ; Mon, 29 Jul 2013 09:45:16 +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 1V3k0w-0001vO-HA; Mon, 29 Jul 2013 09:45:14 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1V3k0u-0000Ab-3m; Mon, 29 Jul 2013 09:45:12 +0000 Received: from mail-la0-x230.google.com ([2a00:1450:4010:c03::230]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1V3k0p-000090-4m for linux-arm-kernel@lists.infradead.org; Mon, 29 Jul 2013 09:45:08 +0000 Received: by mail-la0-f48.google.com with SMTP id hi8so3799922lab.21 for ; Mon, 29 Jul 2013 02:44:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; bh=67pVQX7T7wrvp7LPJHs7Awg2B2wdrGxBwYXM3cfsqAs=; b=jrzTvJMOPPSrfYyCTl1A9RYGE1CX0+or03hbAfQDhSmCGQLH4CjyOMabcVVBkWhoMS 5X0nspr1SgLT4yB1/Bzc7s+4NZV0lYhgrJJKGEO9JpJBQ8cqmgHFe0XilAkssTEYeSU7 tItpfcPLBe9B4CNejUjZV6cLtQ+1sag4LgTcwaXfr/kklhbUP7CdCSjnRlPht863Xa75 ifoAGh+2JZYKk3Z1jB2TemZAi4YRvrVxq8C+Q8opsPfJtO6uM2RmYDo8h1rJoM08xiX/ Yyhd/Ems47AItOyyYbGbe2aeotw784Q9u7u1bxVXdmJ3qOIV+m15qVFqYIOXRc2DNoAX 8Aog== X-Received: by 10.152.18.229 with SMTP id z5mr10198702lad.84.1375091081329; Mon, 29 Jul 2013 02:44:41 -0700 (PDT) Received: from Ildjarn.ath.cx (static-213-115-41-10.sme.bredbandsbolaget.se. [213.115.41.10]) by mx.google.com with ESMTPSA id x8sm23856432lae.10.2013.07.29.02.44.39 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Mon, 29 Jul 2013 02:44:40 -0700 (PDT) From: Jonas Jensen To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v6] clk: add MOXA ART SoCs clock driver Date: Mon, 29 Jul 2013 11:44:22 +0200 Message-Id: <1375091062-3773-1-git-send-email-jonas.jensen@gmail.com> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1374221837-23773-1-git-send-email-jonas.jensen@gmail.com> References: <1374221837-23773-1-git-send-email-jonas.jensen@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130729_054507_367751_FFA67DF6 X-CRM114-Status: GOOD ( 15.88 ) X-Spam-Score: -2.0 (--) Cc: mark.rutland@arm.com, mturquette@linaro.org, linux-kernel@vger.kernel.org, Jonas Jensen , arm@kernel.org, tomasz.figa@gmail.com 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: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-5.6 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, T_DKIM_INVALID, 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 This patch adds MOXA ART SoCs clock driver support. Signed-off-by: Jonas Jensen --- Notes: Changes since v5: 1. corrected of_iomap return value check 2. don't panic, print the error and return Applies to next-20130729 .../bindings/clock/moxa,moxart-core-clock.txt | 23 +++++++ drivers/clk/Makefile | 1 + drivers/clk/clk-moxart.c | 71 ++++++++++++++++++++++ 3 files changed, 95 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/moxa,moxart-core-clock.txt create mode 100644 drivers/clk/clk-moxart.c diff --git a/Documentation/devicetree/bindings/clock/moxa,moxart-core-clock.txt b/Documentation/devicetree/bindings/clock/moxa,moxart-core-clock.txt new file mode 100644 index 0000000..379ae79 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/moxa,moxart-core-clock.txt @@ -0,0 +1,23 @@ +Device Tree Clock bindings for arch-moxart + +This binding uses the common clock binding[1]. + +[1] Documentation/devicetree/bindings/clock/clock-bindings.txt + +MOXA ART SoCs allow to determine core clock frequencies by reading +a register. + +Required properties: +- compatible : Must be "moxa,moxart-core-clock" +- #clock-cells : Should be 0 +- reg : Should contain registers location and length +- clock-output-names : Should be "coreclk" + +For example: + + coreclk: core-clock@98100000 { + compatible = "moxa,moxart-core-clock"; + #clock-cells = <0>; + reg = <0x98100000 0x34>; + clock-output-names = "coreclk"; + }; diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 4038c2b..933622f 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_COMMON_CLK) += clk-composite.o # SoCs specific obj-$(CONFIG_ARCH_BCM2835) += clk-bcm2835.o +obj-$(CONFIG_ARCH_MOXART) += clk-moxart.o obj-$(CONFIG_ARCH_NOMADIK) += clk-nomadik.o obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o obj-$(CONFIG_ARCH_NSPIRE) += clk-nspire.o diff --git a/drivers/clk/clk-moxart.c b/drivers/clk/clk-moxart.c new file mode 100644 index 0000000..14d5b26 --- /dev/null +++ b/drivers/clk/clk-moxart.c @@ -0,0 +1,71 @@ +/* + * MOXA ART SoCs clock driver. + * + * Copyright (C) 2013 Jonas Jensen + * + * Jonas Jensen + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include +#include +#include +#include + +void __init moxart_of_clk_init(struct device_node *node) +{ + static void __iomem *base; + struct clk *clk; + unsigned long rate; + unsigned int mul, val, div; + const char *name; + + base = of_iomap(node, 0); + if (!base) { + pr_err("%s: of_iomap failed\n", node->full_name); + return; + } + + mul = (readl(base + 0x30) >> 3) & 0x1ff; + val = (readl(base + 0x0c) >> 4) & 0x7; + + switch (val) { + case 1: + div = 3; + break; + case 2: + div = 4; + break; + case 3: + div = 6; + break; + case 4: + div = 8; + break; + default: + div = 2; + break; + } + + /* + * the rate calculation below is only tested and proven + * to be true for UC-7112-LX + * + * UC-7112-LX: mul=80 val=0 + * + * to support other moxart SoC hardware, this may need + * a change, though it's possible it works there too + */ + rate = (mul * 1200000 / div); + + of_property_read_string(node, "clock-output-names", &name); + clk = clk_register_fixed_rate(NULL, name, NULL, CLK_IS_ROOT, rate); + clk_register_clkdev(clk, NULL, name); + of_clk_add_provider(node, of_clk_src_simple_get, clk); + + iounmap(base); +} +CLK_OF_DECLARE(moxart_core_clock, "moxa,moxart-core-clock", moxart_of_clk_init);