From patchwork Tue Jan 21 12:44:21 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonas Jensen X-Patchwork-Id: 312929 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id E4ADD2C009B for ; Tue, 21 Jan 2014 23:45:08 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754543AbaAUMpG (ORCPT ); Tue, 21 Jan 2014 07:45:06 -0500 Received: from mail-la0-f52.google.com ([209.85.215.52]:57254 "EHLO mail-la0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754537AbaAUMpF (ORCPT ); Tue, 21 Jan 2014 07:45:05 -0500 Received: by mail-la0-f52.google.com with SMTP id c6so6366676lan.25 for ; Tue, 21 Jan 2014 04:45:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=mbnBJdyMrxEaHxgueO+54hGPF5XBurvOBAXGaqzWkG4=; b=jOpUo1JQqWbUPSFlvnmzSlXvM82/vsbYovjQxdnI/jnwDLZ6NTTM9T5rq38UbV5vrF kBoPaNJQxKksNW1TJ9IMpULFjPnRT+Hh5sSiMmZpf7895OTi3rUC1KJAfq21V/HlADOT 5sxC4AdsfDXk7BUKdY7SpVejhSaSvnaeytxIXgujAe5qygGI04evHbeok6SjA4+mFyzH dImS7xGFg8WOGILQeo4G/AYltwZ8q5E5RuWalHMYV0baVrewFalTsuINACkMKdWpFnTT CTxSD+cp2U7wEc8wJl+K7uDo8YwjF2sgEL34WZ2uTk9a58At4cPIDzZZdOW9AtJbCcOW uhbg== X-Received: by 10.112.126.135 with SMTP id my7mr592038lbb.56.1390308302705; Tue, 21 Jan 2014 04:45:02 -0800 (PST) Received: from Ildjarn.ath.cx (static-213-115-41-10.sme.bredbandsbolaget.se. [213.115.41.10]) by mx.google.com with ESMTPSA id ox6sm3995987lbb.6.2014.01.21.04.45.00 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Tue, 21 Jan 2014 04:45:01 -0800 (PST) From: Jonas Jensen To: mturquette@linaro.org Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, arm@kernel.org, mark.rutland@arm.com, tomasz.figa@gmail.com, adam.jaremko@gmail.com, sylvester.nawrocki@gmail.com, Sudeep.Holla@arm.com, Jonas Jensen Subject: [PATCH v10] clk: add MOXA ART SoCs clock driver Date: Tue, 21 Jan 2014 13:44:21 +0100 Message-Id: <1390308261-4026-1-git-send-email-jonas.jensen@gmail.com> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1389971035-17781-1-git-send-email-jonas.jensen@gmail.com> References: <1389971035-17781-1-git-send-email-jonas.jensen@gmail.com> Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org MOXA ART SoCs allow to determine PLL output and APB frequencies by reading registers holding multiplier and divisor information. Add a clock driver for this SoC. Signed-off-by: Jonas Jensen --- Notes: Thanks for the reply Sudeep, changes are in v10. Changes since v9: 1. rebase drivers/clk/Makefile to next-20140121 2. remove unnecessary switch 3. use a more elaborate commit message Applies to next-20140121 .../bindings/clock/moxa,moxart-clock.txt | 48 +++++++++++ drivers/clk/Makefile | 1 + drivers/clk/clk-moxart.c | 99 ++++++++++++++++++++++ 3 files changed, 148 insertions(+) create mode 100644 Documentation/devicetree/bindings/clock/moxa,moxart-clock.txt create mode 100644 drivers/clk/clk-moxart.c diff --git a/Documentation/devicetree/bindings/clock/moxa,moxart-clock.txt b/Documentation/devicetree/bindings/clock/moxa,moxart-clock.txt new file mode 100644 index 0000000..242e3fc --- /dev/null +++ b/Documentation/devicetree/bindings/clock/moxa,moxart-clock.txt @@ -0,0 +1,48 @@ +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 PLL output and APB frequencies +by reading registers holding multiplier and divisor information. + + +PLL: + +Required properties: +- compatible : Must be "moxa,moxart-pll-clock" +- #clock-cells : Should be 0 +- reg : Should contain registers location and length +- clocks : Should contain phandle to parent clock + +Optional properties: +- clock-output-names : Should contain clock name + + +APB: + +Required properties: +- compatible : Must be "moxa,moxart-apb-clock" +- #clock-cells : Should be 0 +- reg : Should contain registers location and length +- clocks : Should contain phandle to parent clock + +Optional properties: +- clock-output-names : Should contain clock name + + +For example: + + clk_pll: clk_pll@98100000 { + compatible = "moxa,moxart-pll-clock"; + #clock-cells = <0>; + reg = <0x98100000 0x34>; + }; + + clk_apb: clk_apb@98100000 { + compatible = "moxa,moxart-apb-clock"; + #clock-cells = <0>; + reg = <0x98100000 0x34>; + clocks = <&clk_pll>; + }; diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 58b2d72..24361bf 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_COMMON_CLK) += clk-composite.o # SoCs specific obj-$(CONFIG_ARCH_BCM2835) += clk-bcm2835.o obj-$(CONFIG_ARCH_EFM32) += clk-efm32gg.o +obj-$(CONFIG_ARCH_MOXART) += clk-moxart.o obj-$(CONFIG_ARCH_NOMADIK) += clk-nomadik.o obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o obj-$(CONFIG_ARCH_HI3xxx) += hisilicon/ diff --git a/drivers/clk/clk-moxart.c b/drivers/clk/clk-moxart.c new file mode 100644 index 0000000..7021748 --- /dev/null +++ b/drivers/clk/clk-moxart.c @@ -0,0 +1,99 @@ +/* + * 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_pll_clk_init(struct device_node *node) +{ + static void __iomem *base; + struct clk *clk, *ref_clk; + unsigned long rate; + unsigned int mul; + const char *name = node->name; + + of_property_read_string(node, "clock-output-names", &name); + + base = of_iomap(node, 0); + if (!base) { + pr_err("%s: of_iomap failed\n", node->full_name); + return; + } + + mul = readl(base + 0x30) >> 3 & 0x3f; + iounmap(base); + + ref_clk = of_clk_get(node, 0); + if (IS_ERR(ref_clk)) { + pr_err("%s: of_clk_get failed\n", node->full_name); + return; + } + + rate = mul * clk_get_rate(ref_clk); + + clk = clk_register_fixed_rate(NULL, name, NULL, CLK_IS_ROOT, rate); + if (IS_ERR(clk)) { + pr_err("%s: clk_register_fixed_rate failed\n", node->full_name); + return; + } + + clk_register_clkdev(clk, NULL, name); + of_clk_add_provider(node, of_clk_src_simple_get, clk); +} +CLK_OF_DECLARE(moxart_pll_clock, "moxa,moxart-pll-clock", + moxart_of_pll_clk_init); + +void __init moxart_of_apb_clk_init(struct device_node *node) +{ + static void __iomem *base; + struct clk *clk, *pll_clk; + unsigned long rate; + unsigned int div, val; + unsigned int div_idx[] = { 2, 3, 4, 6, 8}; + const char *name = node->name; + + of_property_read_string(node, "clock-output-names", &name); + + base = of_iomap(node, 0); + if (!base) { + pr_err("%s: of_iomap failed\n", node->full_name); + return; + } + + val = readl(base + 0xc) >> 4 & 0x7; + iounmap(base); + + if (val > 4) + val = 0; + div = div_idx[val]; + + pll_clk = of_clk_get(node, 0); + if (IS_ERR(pll_clk)) { + pr_err("%s: of_clk_get failed\n", node->full_name); + return; + } + + rate = clk_get_rate(pll_clk) / (div * 2); + + clk = clk_register_fixed_rate(NULL, name, NULL, CLK_IS_ROOT, rate); + if (IS_ERR(clk)) { + pr_err("%s: clk_register_fixed_rate failed\n", node->full_name); + return; + } + + clk_register_clkdev(clk, NULL, name); + of_clk_add_provider(node, of_clk_src_simple_get, clk); +} +CLK_OF_DECLARE(moxart_apb_clock, "moxa,moxart-apb-clock", + moxart_of_apb_clk_init);