From patchwork Wed Jul 17 13:23:16 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonas Jensen X-Patchwork-Id: 2828604 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 7A47C9F967 for ; Wed, 17 Jul 2013 13:24:25 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 34C252012C for ; Wed, 17 Jul 2013 13:24:24 +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 CC69720124 for ; Wed, 17 Jul 2013 13:24:22 +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 1UzRi8-0002tn-ON; Wed, 17 Jul 2013 13:24:05 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UzRi6-0002e8-Au; Wed, 17 Jul 2013 13:24:02 +0000 Received: from mail-lb0-x236.google.com ([2a00:1450:4010:c04::236]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UzRi2-0002d1-Fm for linux-arm-kernel@lists.infradead.org; Wed, 17 Jul 2013 13:23:59 +0000 Received: by mail-lb0-f182.google.com with SMTP id r11so1557502lbv.13 for ; Wed, 17 Jul 2013 06:23:34 -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=l0G3VD/CoN4S1Dw46JxG2smy3ZfgNEEERsse+JhdDZ4=; b=W9bI+8acd/66zjsRjX17vAvxAuvYwxQjPC5q4VrgNniRvDfGEL6BdQX2jj8HIePovo oSUC9Fyf8a0TqW4234SEE7Yb8nuMKrPUHBrDS+inQMyI8n2z0R9dEomnTV39F6cecrq8 dZNNo3X6gcqb7F1Fc7L8137grQJaGekye6oaspe4TgiM3NR0+NFb/xe+l9kLy3Ea4r43 zriMMQvDixp6KhO+lkLdjzP1r2ue8cRiLhehUaoAoEg43Rp9XbfE9Urqa5tWjnXn2Tf3 C0wtFlJLm7iDNhY+KzajJ1G0UEYzA/dKF/wMLG39IBF+j64T3aHUfWHpg9Kf9iZKgNXw m0RA== X-Received: by 10.112.51.99 with SMTP id j3mr3182920lbo.82.1374067414675; Wed, 17 Jul 2013 06:23:34 -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 u1sm2420690lag.5.2013.07.17.06.23.32 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Wed, 17 Jul 2013 06:23:33 -0700 (PDT) From: Jonas Jensen To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v3] clk: add MOXA ART SoCs clock driver Date: Wed, 17 Jul 2013 15:23:16 +0200 Message-Id: <1374067396-30155-1-git-send-email-jonas.jensen@gmail.com> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1372943292-6960-1-git-send-email-jonas.jensen@gmail.com> References: <1372943292-6960-1-git-send-email-jonas.jensen@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130717_092358_892830_CA668FDA X-CRM114-Status: GOOD ( 16.94 ) X-Spam-Score: -2.0 (--) Cc: arm@kernel.org, mturquette@linaro.org, linux-kernel@vger.kernel.org, Jonas Jensen 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=-4.5 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 v2: 1. add devicetree bindings document Applies to next-20130716 .../bindings/clock/moxa,moxart-core-clock.txt | 19 +++++ drivers/clk/Makefile | 1 + drivers/clk/clk-moxart.c | 82 ++++++++++++++++++++++ 3 files changed, 102 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..cf69361 --- /dev/null +++ b/Documentation/devicetree/bindings/clock/moxa,moxart-core-clock.txt @@ -0,0 +1,19 @@ +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 : Should be "moxa,moxart-core-clock" +- reg : Should contain registers location and length + +For example: + + clk: core-clock@98100000 { + compatible = "moxa,moxart-core-clock"; + reg = <0x98100000 0x34>; + }; 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..79c27f4 --- /dev/null +++ b/drivers/clk/clk-moxart.c @@ -0,0 +1,82 @@ +/* + * 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 +#include +#include +#include +#include +#include + +static const struct of_device_id moxart_apb_clock_match[] = { + { .compatible = "moxa,moxart-apb-clock" }, + { } +}; + +void __init moxart_of_clk_init(struct device_node *node) +{ + static void __iomem *base; + struct device_node *clk_node; + struct clk *clk; + unsigned long rate; + unsigned int mul, val, div; + + base = of_iomap(node, 0); + if (IS_ERR(base)) + panic("%s: of_iomap failed\n", node->full_name); + + clk_node = of_find_matching_node(NULL, moxart_apb_clock_match); + if (!clk_node) + panic("%s: can't find clock DT node\n", node->full_name); + + 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); + + clk = clk_register_fixed_rate(NULL, "clkapb", NULL, CLK_IS_ROOT, rate); + clk_register_clkdev(clk, NULL, "clkapb"); + of_clk_add_provider(clk_node, of_clk_src_simple_get, clk); + + iounmap(base); +} +CLK_OF_DECLARE(moxart_core_clock, "moxa,moxart-core-clock", moxart_of_clk_init);