From patchwork Mon Jun 16 18:02:32 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Javier Martinez Canillas X-Patchwork-Id: 4361841 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 62203BEEAA for ; Mon, 16 Jun 2014 18:17:27 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 46BFD2018E for ; Mon, 16 Jun 2014 18:17:26 +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 4828D200DF for ; Mon, 16 Jun 2014 18:17:25 +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 1WwbGf-0007nn-16; Mon, 16 Jun 2014 18:04:29 +0000 Received: from bhuna.collabora.co.uk ([93.93.135.160]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WwbFm-0007IH-NT for linux-arm-kernel@lists.infradead.org; Mon, 16 Jun 2014 18:03:36 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: javier) with ESMTPSA id 0A3BE60268A From: Javier Martinez Canillas To: Lee Jones Subject: [PATCH v2 04/10] clk: Add generic driver for Maxim PMIC clocks Date: Mon, 16 Jun 2014 20:02:32 +0200 Message-Id: <1402941758-11216-5-git-send-email-javier.martinez@collabora.co.uk> X-Mailer: git-send-email 2.0.0.rc2 In-Reply-To: <1402941758-11216-1-git-send-email-javier.martinez@collabora.co.uk> References: <1402941758-11216-1-git-send-email-javier.martinez@collabora.co.uk> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140616_110335_162811_FB54CB0D X-CRM114-Status: GOOD ( 18.62 ) X-Spam-Score: -1.0 (-) Cc: Alessandro Zummo , Krzysztof Kozlowski , Kukjin Kim , Mike Turquette , Samuel Ortiz , Tomeu Vizoso , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Liam Girdwood , Doug Anderson , linux-samsung-soc@vger.kernel.org, Sjoerd Simons , Mark Brown , Olof Johansson , Javier Martinez Canillas , linux-arm-kernel@lists.infradead.org, Daniel Stone 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=-2.9 required=5.0 tests=BAYES_00,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 Maxim Integrated Power Management ICs are very similar with regard to their clock outputs. Most of the clock drivers for these chips are duplicating code and are simpler enough that can be converted to use a generic driver to consolidate code and avoid duplication. Signed-off-by: Javier Martinez Canillas --- drivers/clk/Kconfig | 3 + drivers/clk/Makefile | 1 + drivers/clk/clk-max-gen.c | 197 ++++++++++++++++++++++++++++++++++++++++++++++ drivers/clk/clk-max-gen.h | 32 ++++++++ 4 files changed, 233 insertions(+) create mode 100644 drivers/clk/clk-max-gen.c create mode 100644 drivers/clk/clk-max-gen.h diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig index 9f9c5ae..73f78e8 100644 --- a/drivers/clk/Kconfig +++ b/drivers/clk/Kconfig @@ -32,6 +32,9 @@ config COMMON_CLK_WM831X source "drivers/clk/versatile/Kconfig" +config COMMON_CLK_MAX_GEN + bool + config COMMON_CLK_MAX77686 tristate "Clock driver for Maxim 77686 MFD" depends on MFD_MAX77686 diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile index 567f102..6c1aff6 100644 --- a/drivers/clk/Makefile +++ b/drivers/clk/Makefile @@ -18,6 +18,7 @@ obj-$(CONFIG_ARCH_BCM2835) += clk-bcm2835.o obj-$(CONFIG_ARCH_EFM32) += clk-efm32gg.o obj-$(CONFIG_ARCH_HIGHBANK) += clk-highbank.o obj-$(CONFIG_MACH_LOONGSON1) += clk-ls1x.o +obj-$(CONFIG_COMMON_CLK_MAX_GEN) += clk-max-gen.o obj-$(CONFIG_COMMON_CLK_MAX77686) += clk-max77686.o obj-$(CONFIG_ARCH_MOXART) += clk-moxart.o obj-$(CONFIG_ARCH_NOMADIK) += clk-nomadik.o diff --git a/drivers/clk/clk-max-gen.c b/drivers/clk/clk-max-gen.c new file mode 100644 index 0000000..aa9ebbe --- /dev/null +++ b/drivers/clk/clk-max-gen.c @@ -0,0 +1,197 @@ +/* + * clk-max-gen.c - Generic clock driver for Maxim PMICs clocks + * + * Copyright (C) 2012 Samsung Electornics + * Jonghwa Lee + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * This driver is based on clk-max77686.c + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +struct max_gen_clk { + struct regmap *regmap; + u32 mask; + u32 reg; + struct clk_hw hw; + struct clk_lookup *lookup; +}; + +static struct max_gen_clk *to_max_gen_clk(struct clk_hw *hw) +{ + return container_of(hw, struct max_gen_clk, hw); +} + +static int max_gen_clk_prepare(struct clk_hw *hw) +{ + struct max_gen_clk *max_gen = to_max_gen_clk(hw); + + return regmap_update_bits(max_gen->regmap, max_gen->reg, + max_gen->mask, max_gen->mask); +} + +static void max_gen_clk_unprepare(struct clk_hw *hw) +{ + struct max_gen_clk *max_gen = to_max_gen_clk(hw); + + regmap_update_bits(max_gen->regmap, max_gen->reg, + max_gen->mask, ~max_gen->mask); +} + +static int max_gen_clk_is_prepared(struct clk_hw *hw) +{ + struct max_gen_clk *max_gen = to_max_gen_clk(hw); + int ret; + u32 val; + + ret = regmap_read(max_gen->regmap, max_gen->reg, &val); + + if (ret < 0) + return -EINVAL; + + return val & max_gen->mask; +} + +static unsigned long max_gen_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + return 32768; +} + +struct clk_ops max_gen_clk_ops = { + .prepare = max_gen_clk_prepare, + .unprepare = max_gen_clk_unprepare, + .is_prepared = max_gen_clk_is_prepared, + .recalc_rate = max_gen_recalc_rate, +}; + +static struct clk *max_gen_clk_register(struct device *dev, + struct max_gen_clk *max_gen) +{ + struct clk *clk; + struct clk_hw *hw = &max_gen->hw; + + clk = clk_register(dev, hw); + if (IS_ERR(clk)) + return clk; + + max_gen->lookup = kzalloc(sizeof(struct clk_lookup), GFP_KERNEL); + if (!max_gen->lookup) + return ERR_PTR(-ENOMEM); + + max_gen->lookup->con_id = hw->init->name; + max_gen->lookup->clk = clk; + + clkdev_add(max_gen->lookup); + + return clk; +} + +int max_gen_clk_probe(struct platform_device *pdev, struct regmap *regmap, + u32 reg, struct clk_init_data *clks_init, int num_init) +{ + int i, ret; + struct max_gen_clk **max_gen_clks; + struct clk **clocks; + struct device *dev = &pdev->dev; + + clocks = devm_kzalloc(dev, sizeof(struct clk *) * num_init, GFP_KERNEL); + if (!clocks) + return -ENOMEM; + + max_gen_clks = devm_kzalloc(dev, sizeof(struct max_gen_clk *) + * num_init, GFP_KERNEL); + if (!max_gen_clks) + return -ENOMEM; + + for (i = 0; i < num_init; i++) { + max_gen_clks[i] = devm_kzalloc(dev, sizeof(struct max_gen_clk), + GFP_KERNEL); + if (!max_gen_clks[i]) + return -ENOMEM; + } + + for (i = 0; i < num_init; i++) { + max_gen_clks[i]->regmap = regmap; + max_gen_clks[i]->mask = 1 << i; + max_gen_clks[i]->reg = reg; + max_gen_clks[i]->hw.init = &clks_init[i]; + + clocks[i] = max_gen_clk_register(dev, max_gen_clks[i]); + if (IS_ERR(clocks[i])) { + ret = PTR_ERR(clocks[i]); + dev_err(dev, "failed to register %s\n", + max_gen_clks[i]->hw.init->name); + goto err_clocks; + } + } + + platform_set_drvdata(pdev, clocks); + + if (dev->of_node) { + struct clk_onecell_data *of_data; + + of_data = devm_kzalloc(dev, sizeof(*of_data), GFP_KERNEL); + if (!of_data) { + ret = -ENOMEM; + goto err_clocks; + } + + of_data->clks = clocks; + of_data->clk_num = num_init; + ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, + of_data); + + if (ret) { + dev_err(dev, "failed to register OF clock provider\n"); + goto err_clocks; + } + } + + return 0; + +err_clocks: + for (--i; i >= 0; --i) { + clkdev_drop(max_gen_clks[i]->lookup); + clk_unregister(max_gen_clks[i]->hw.clk); + } + + return ret; +} + +int max_gen_clk_remove(struct platform_device *pdev, int num_init) +{ + struct clk **clocks = platform_get_drvdata(pdev); + struct device *dev = pdev->dev.parent; + int i; + + if (dev->of_node) + of_clk_del_provider(dev->of_node); + + for (i = 0; i < num_init; i++) { + struct clk_hw *hw = __clk_get_hw(clocks[i]); + struct max_gen_clk *max_gen = to_max_gen_clk(hw); + + clkdev_drop(max_gen->lookup); + clk_unregister(clocks[i]); + } + return 0; +} diff --git a/drivers/clk/clk-max-gen.h b/drivers/clk/clk-max-gen.h new file mode 100644 index 0000000..997e86f --- /dev/null +++ b/drivers/clk/clk-max-gen.h @@ -0,0 +1,32 @@ +/* + * clk-max-gen.h - Generic clock driver for Maxim PMICs clocks + * + * Copyright (C) 2014 Google, Inc + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#ifndef __CLK_MAX_GEN_H__ +#define __CLK_MAX_GEN_H__ + +#include +#include +#include +#include +#include + +int max_gen_clk_probe(struct platform_device *pdev, struct regmap *regmap, + u32 reg, struct clk_init_data *clks_init, int num_init); +int max_gen_clk_remove(struct platform_device *pdev, int num_init); +extern struct clk_ops max_gen_clk_ops; + +#endif /* __CLK_MAX_GEN_H__ */