From patchwork Wed Jun 18 15:29:32 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Sylwester Nawrocki/Kernel \\(PLT\\) /SRPOL/Staff Engineer/Samsung Electronics" X-Patchwork-Id: 4377601 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 0C2DBBEEAA for ; Wed, 18 Jun 2014 15:33:45 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A8893202FE for ; Wed, 18 Jun 2014 15:33:43 +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 5EEE720158 for ; Wed, 18 Jun 2014 15:33:42 +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 1WxHph-0006sp-1Z; Wed, 18 Jun 2014 15:31:29 +0000 Received: from mailout1.samsung.com ([203.254.224.24]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WxHpY-0006cr-PB for linux-arm-kernel@lists.infradead.org; Wed, 18 Jun 2014 15:31:23 +0000 Received: from epcpsbgm2.samsung.com (epcpsbgm2 [203.254.230.27]) by mailout1.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0N7D005B2F3LQJC0@mailout1.samsung.com> for linux-arm-kernel@lists.infradead.org; Thu, 19 Jun 2014 00:30:57 +0900 (KST) X-AuditID: cbfee61b-b7fbb6d000001be3-f3-53a1b0b061e1 Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm2.samsung.com (EPCPMTA) with SMTP id F4.2F.07139.0B0B1A35; Thu, 19 Jun 2014 00:30:57 +0900 (KST) Received: from amdc1344.digital.local ([106.116.147.32]) by mmp1.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0N7D00H6VF1BBW00@mmp1.samsung.com>; Thu, 19 Jun 2014 00:30:56 +0900 (KST) From: Sylwester Nawrocki To: mturquette@linaro.org, devicetree@vger.kernel.org Subject: [PATCH/RFC V8 1/1] clk: Support for clock parents and rates assigned from device tree Date: Wed, 18 Jun 2014 17:29:32 +0200 Message-id: <1403105372-30403-2-git-send-email-s.nawrocki@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1403105372-30403-1-git-send-email-s.nawrocki@samsung.com> References: <1403105372-30403-1-git-send-email-s.nawrocki@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrELMWRmVeSWpSXmKPExsVy+t9jAd2NGxYGG/z0tJj68Ambxfwj51gt +t8sZLVoXryezeJs0xt2i02Pr7FadPz9wmhxedccNovGjzfZLdYeuctusfT6RSaLpxMusllM mL6WxeLwm3ZWi/UzXrNYrDwxi9lBwGPNvDWMHpf7epk8Nq3qZPO4c20Pm8f+uWvYPTYvqffo 27KK0ePkqScsHp83yQVwRnHZpKTmZJalFunbJXBl3P54hKVgYV7FtTVn2RoYGyO6GDk5JARM JJqWN7FB2GISF+6tB7OFBBYxSrT/c+1i5AKyO5gkzn3Zyw6SYBMwlOg92scIYosImEq8u/6N CaSIWeA/k8S0HQfAioQFEiSefZ4BZrMIqEpsmfaMGcTmFXCTuHmhEaiZA2ibgsScSTYgYU4B d4n3Z5exQCx2k1i7bhnTBEbeBYwMqxhFUwuSC4qT0nON9IoTc4tL89L1kvNzNzGCQ/qZ9A7G VQ0WhxgFOBiVeHg5chcEC7EmlhVX5h5ilOBgVhLhXb18YbAQb0piZVVqUX58UWlOavEhRmkO FiVx3oOt1oFCAumJJanZqakFqUUwWSYOTqkGxvXrRZLPfOD6K31qZ9rk9XFi7O991r5uWvTn 2JuyZbfeP3vP5ng99NEq6Sf88QsUYuW+Vh7eXHCv1+fR7YlOLldqlkdeXJaypSt/2byZqu8n J+h6ie1rqZi26s7kppuvk21FYkJlurhlNKMfP71aWW59qv4J139ddZ2kqdMK/u0XYXf0qdMK vqvEUpyRaKjFXFScCACeNTssZQIAAA== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140618_083121_173639_08E81BE0 X-CRM114-Status: GOOD ( 28.49 ) X-Spam-Score: -5.0 (-----) Cc: mark.rutland@arm.com, pawel.moll@arm.com, wsa@the-dreams.de, gregkh@linuxfoundation.org, t.figa@samsung.com, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, kyungmin.park@samsung.com, broonie@kernel.org, linux-i2c@vger.kernel.org, Sylwester Nawrocki , galak@codeaurora.org, linux-arm-kernel@lists.infradead.org, m.szyprowski@samsung.com X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 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=-1.9 required=5.0 tests=BAYES_00, T_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 This patch adds helper functions to configure clock parents and rates as specified through 'assigned-clock-parents', 'assigned-clock-rates' DT properties for a clock provider or clock consumer device. The helpers are now being called by the bus code for the platform, I2C and SPI busses, before the driver probing and also in the clock core after registration of a clock provider. Signed-off-by: Sylwester Nawrocki Acked-by: Kyungmin Park Acked-by: Wolfram Sang --- Changes since v6: - use a set of separate DT properties to specify the default parent clocks and rates; - the clock defaults setting extended to the I2C and SPI busses. Changes since v5: - updated the DT binding description (dropped 'assigned-clocks' node); - fixed detecting of null phandles (ENOENT error handling); - modified of_clk_init() to account for that the clocks property may now contain a clock specifier with a phandle that points to our node; Changes since v4: - added note explaining how to skip setting parent and rate of a clock, - moved of_clk_dev_init() calls to the platform bus, - added missing call to of_node_put(), - dropped debug traces. Changes since v3: - added detailed description of the assigned-clocks subnode, - added missing 'static inline' to the function stub definition, - clk-conf.c is now excluded when CONFIG_OF is not set, - s/of_clk_device_setup/of_clk_device_init. Changes since v2: - edited in clock-bindings.txt, added note about 'assigned-clocks' subnode which may be used to specify "global" clocks configuration at a clock provider node, - moved of_clk_device_setup() function declaration from clk-provider.h to clk-conf.h so required function stubs are available when CONFIG_COMMON_CLK is not enabled, Changes since v1: - the helper function to parse and set assigned clock parents and rates made public so it is available to clock providers to call directly; - dropped the platform bus notification and call of_clk_device_setup() is is now called from the driver core, rather than from the notification callback; - s/of_clk_get_list_entry/of_clk_get_by_property. --- .../devicetree/bindings/clock/clock-bindings.txt | 36 +++++ drivers/base/platform.c | 5 + drivers/clk/Makefile | 3 + drivers/clk/clk-conf.c | 143 ++++++++++++++++++++ drivers/clk/clk.c | 12 +- drivers/i2c/i2c-core.c | 5 + drivers/spi/spi.c | 5 + include/linux/clk/clk-conf.h | 20 +++ 8 files changed, 227 insertions(+), 2 deletions(-) create mode 100644 drivers/clk/clk-conf.c create mode 100644 include/linux/clk/clk-conf.h -- 1.7.9.5 diff --git a/Documentation/devicetree/bindings/clock/clock-bindings.txt b/Documentation/devicetree/bindings/clock/clock-bindings.txt index f1578781..06fc6d5 100644 --- a/Documentation/devicetree/bindings/clock/clock-bindings.txt +++ b/Documentation/devicetree/bindings/clock/clock-bindings.txt @@ -131,3 +131,39 @@ clock signal, and a UART. ("pll" and "pll-switched"). * The UART has its baud clock connected the external oscillator and its register clock connected to the PLL clock (the "pll-switched" signal) + +==Assigned clock parents and rates== + +Some platforms may require initial configuration of default parent clocks +and clock frequencies. Such a configuration can be specified in a device tree +node through assigned-clocks, assigned-clock-parents and assigned-clock-rates +properties. The assigned-clock-parents property should contain a list of parent +clocks in form of phandle and clock specifier pairs, the assigned-clock-parents +property the list of assigned clock frequency values - corresponding to clocks +listed in the assigned-clocks property. + +To skip setting parent or rate of a clock its corresponding entry should be +set to 0, or can be omitted if it is not followed by any non-zero entry. + + uart@a000 { + compatible = "fsl,imx-uart"; + reg = <0xa000 0x1000>; + ... + clocks = <&osc 0>, <&pll 1>; + clock-names = "baud", "register"; + + assigned-clocks = <&clkcon 0>, <&pll 2>; + assigned-clock-parents = <&pll 2>; + assigned-clock-rates = <0>, <460800>; + }; + +In this example the <&pll 2> clock is set as parent of clock <&clkcon 0> and +the <&pll 2> clock is assigned a frequency value of 460800 Hz. + +Configuring a clock's parent and rate through the device node that consumes +the clock can be done only for clocks that have a single user. Specifying +conflicting parent or rate configuration in multiple consumer nodes for +a shared clock is forbidden. + +Configuration of common clocks, which affect multiple consumer devices can +be similarly specified in the clock provider node. diff --git a/drivers/base/platform.c b/drivers/base/platform.c index 5b47210..f622733 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -23,6 +23,7 @@ #include #include #include +#include #include "base.h" #include "power/power.h" @@ -486,6 +487,10 @@ static int platform_drv_probe(struct device *_dev) struct platform_device *dev = to_platform_device(_dev); int ret; + ret = of_clk_set_defaults(_dev->of_node, false); + if (ret < 0) + return ret; + acpi_dev_pm_attach(_dev, true); ret = drv->probe(dev); diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index b25a1fe..7fe358c 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -8,6 +8,9 @@ obj-$(CONFIG_COMMON_CLK) += clk-fixed-rate.o obj-$(CONFIG_COMMON_CLK) += clk-gate.o obj-$(CONFIG_COMMON_CLK) += clk-mux.o obj-$(CONFIG_COMMON_CLK) += clk-composite.o +ifeq ($(CONFIG_OF), y) +obj-$(CONFIG_COMMON_CLK) += clk-conf.o +endif # hardware specific clock types # please keep this section sorted lexicographically by file/directory path name diff --git a/drivers/clk/clk-conf.c b/drivers/clk/clk-conf.c new file mode 100644 index 0000000..1f73019 --- /dev/null +++ b/drivers/clk/clk-conf.c @@ -0,0 +1,143 @@ +/* + * Copyright (C) 2014 Samsung Electronics Co., Ltd. + * Sylwester Nawrocki + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include "clk.h" + +static int __set_clk_parents(struct device_node *node, bool clk_supplier) +{ + struct of_phandle_args clkspec; + int index, rc, num_parents; + struct clk *clk, *pclk; + + num_parents = of_count_phandle_with_args(node, "assigned-clock-parents", + "#clock-cells"); + if (num_parents == -EINVAL) + pr_err("clk: invalid value of clock-parents property at %s\n", + node->full_name); + + for (index = 0; index < num_parents; index++) { + rc = of_parse_phandle_with_args(node, "assigned-clock-parents", + "#clock-cells", index, &clkspec); + if (rc < 0) { + /* skip empty (null) phandles */ + if (rc == -ENOENT) + continue; + else + return rc; + } + if (clkspec.np == node && !clk_supplier) + return 0; + pclk = of_clk_get_by_clkspec(&clkspec); + if (IS_ERR(pclk)) { + pr_warn("clk: couldn't get parent clock %d for %s\n", + index, node->full_name); + return PTR_ERR(pclk); + } + + rc = of_parse_phandle_with_args(node, "assigned-clocks", + "#clock-cells", index, &clkspec); + if (rc < 0) + goto err; + if (clkspec.np == node && !clk_supplier) { + rc = 0; + goto err; + } + clk = of_clk_get_by_clkspec(&clkspec); + if (IS_ERR(pclk)) { + pr_warn("clk: couldn't get parent clock %d for %s\n", + index, node->full_name); + rc = PTR_ERR(pclk); + goto err; + } + + rc = clk_set_parent(clk, pclk); + if (rc < 0) + pr_err("clk: failed to reparent %s to %s: %d\n", + __clk_get_name(clk), __clk_get_name(pclk), rc); + clk_put(clk); + clk_put(pclk); + } + return 0; +err: + clk_put(pclk); + return rc; +} + +static int __set_clk_rates(struct device_node *node, bool clk_supplier) +{ + struct of_phandle_args clkspec; + struct property *prop; + const __be32 *cur; + int rc, index = 0; + struct clk *clk; + u32 rate; + + of_property_for_each_u32(node, "assigned-clock-rates", prop, cur, rate) { + if (rate) { + rc = of_parse_phandle_with_args(node, "assigned-clocks", + "#clock-cells", index, &clkspec); + if (rc < 0) { + /* skip empty (null) phandles */ + if (rc == -ENOENT) + continue; + else + return rc; + } + if (clkspec.np == node && !clk_supplier) + return 0; + + clk = of_clk_get_by_clkspec(&clkspec); + if (IS_ERR(clk)) { + pr_warn("clk: couldn't get clock %d for %s\n", + index, node->full_name); + return PTR_ERR(clk); + } + + rc = clk_set_rate(clk, rate); + if (rc < 0) + pr_err("clk: couldn't set %s clock rate: %d\n", + __clk_get_name(clk), rc); + clk_put(clk); + } + index++; + } + return 0; +} + +/** + * of_clk_set_defaults() - parse and set assigned clocks configuration + * @node: device node to apply clock settings for + * @clk_supplier: true if clocks supplied by @node should also be considered + * + * This function parses 'assigned-{clocks/clock-parents/clock-rates}' properties + * and sets any specified clock parents and rates. The @clk_supplier argument + * should be set to true if @node may be also a clock supplier of any clock + * listed in its 'assigned-clocks' or 'assigned-clock-parents' properties. + * If @clk_supplier is false the function exits returnning 0 as soon as it + * determines the @node is also a supplier of any of the clocks. + */ +int of_clk_set_defaults(struct device_node *node, bool clk_supplier) +{ + int rc; + + if (!node) + return 0; + + rc = __set_clk_parents(node, clk_supplier); + if (rc < 0) + return rc; + + return __set_clk_rates(node, clk_supplier); +} diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 8b73ede..a77af45 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -10,6 +10,7 @@ */ #include +#include #include #include #include @@ -2414,6 +2415,7 @@ int of_clk_add_provider(struct device_node *np, void *data) { struct of_clk_provider *cp; + int ret; cp = kzalloc(sizeof(struct of_clk_provider), GFP_KERNEL); if (!cp) @@ -2428,7 +2430,11 @@ int of_clk_add_provider(struct device_node *np, mutex_unlock(&of_clk_mutex); pr_debug("Added clock from %s\n", np->full_name); - return 0; + ret = of_clk_set_defaults(np, true); + if (ret < 0) + of_clk_del_provider(np); + + return ret; } EXPORT_SYMBOL_GPL(of_clk_add_provider); @@ -2605,7 +2611,10 @@ void __init of_clk_init(const struct of_device_id *matches) list_for_each_entry_safe(clk_provider, next, &clk_provider_list, node) { if (force || parent_ready(clk_provider->np)) { + clk_provider->clk_init_cb(clk_provider->np); + of_clk_set_defaults(clk_provider->np, true); + list_del(&clk_provider->node); kfree(clk_provider); is_init_done = true; @@ -2620,7 +2629,6 @@ void __init of_clk_init(const struct of_device_id *matches) */ if (!is_init_done) force = true; - } } #endif diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 7c7f4b8..66aa83b 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -42,6 +42,7 @@ #include #include #include +#include #include #include #include @@ -274,6 +275,10 @@ static int i2c_device_probe(struct device *dev) client->flags & I2C_CLIENT_WAKE); dev_dbg(dev, "probe\n"); + status = of_clk_set_defaults(dev->of_node, false); + if (status < 0) + return status; + acpi_dev_pm_attach(&client->dev, true); status = driver->probe(client, i2c_match_id(driver->id_table, client)); if (status) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 939edf4..8374620 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -29,6 +29,7 @@ #include #include #include +#include #include #include #include @@ -259,6 +260,10 @@ static int spi_drv_probe(struct device *dev) const struct spi_driver *sdrv = to_spi_driver(dev->driver); int ret; + ret = of_clk_set_defaults(dev->of_node, false); + if (ret) + return ret; + acpi_dev_pm_attach(dev, true); ret = sdrv->probe(to_spi_device(dev)); if (ret) diff --git a/include/linux/clk/clk-conf.h b/include/linux/clk/clk-conf.h new file mode 100644 index 0000000..f3050e1 --- /dev/null +++ b/include/linux/clk/clk-conf.h @@ -0,0 +1,20 @@ +/* + * Copyright (C) 2014 Samsung Electronics Co., Ltd. + * Sylwester Nawrocki + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +struct device_node; + +#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK) +int of_clk_set_defaults(struct device_node *node, bool clk_supplier); +#else +static inline int of_clk_set_defaults(struct device_node *node, + bool clk_supplier) +{ + return 0; +} +#endif