2 * clk-max-gen.c - Generic clock driver for Maxim PMICs clocks
4 * Copyright (C) 2014 Google, Inc
6 * Copyright (C) 2012 Samsung Electornics
7 * Jonghwa Lee <jonghwa3.lee@samsung.com>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * This driver is based on clk-max77686.c
23 #include <linux/kernel.h>
24 #include <linux/slab.h>
25 #include <linux/err.h>
26 #include <linux/regmap.h>
27 #include <linux/platform_device.h>
28 #include <linux/clk-provider.h>
29 #include <linux/mutex.h>
30 #include <linux/clkdev.h>
32 #include <linux/export.h>
35 struct regmap *regmap;
41 static struct max_gen_clk *to_max_gen_clk(struct clk_hw *hw)
43 return container_of(hw, struct max_gen_clk, hw);
46 static int max_gen_clk_prepare(struct clk_hw *hw)
48 struct max_gen_clk *max_gen = to_max_gen_clk(hw);
50 return regmap_update_bits(max_gen->regmap, max_gen->reg,
51 max_gen->mask, max_gen->mask);
54 static void max_gen_clk_unprepare(struct clk_hw *hw)
56 struct max_gen_clk *max_gen = to_max_gen_clk(hw);
58 regmap_update_bits(max_gen->regmap, max_gen->reg,
59 max_gen->mask, ~max_gen->mask);
62 static int max_gen_clk_is_prepared(struct clk_hw *hw)
64 struct max_gen_clk *max_gen = to_max_gen_clk(hw);
68 ret = regmap_read(max_gen->regmap, max_gen->reg, &val);
73 return val & max_gen->mask;
76 static unsigned long max_gen_recalc_rate(struct clk_hw *hw,
77 unsigned long parent_rate)
82 struct clk_ops max_gen_clk_ops = {
83 .prepare = max_gen_clk_prepare,
84 .unprepare = max_gen_clk_unprepare,
85 .is_prepared = max_gen_clk_is_prepared,
86 .recalc_rate = max_gen_recalc_rate,
88 EXPORT_SYMBOL_GPL(max_gen_clk_ops);
90 static struct clk *max_gen_clk_register(struct device *dev,
91 struct max_gen_clk *max_gen)
94 struct clk_hw *hw = &max_gen->hw;
97 clk = devm_clk_register(dev, hw);
101 ret = clk_register_clkdev(clk, hw->init->name, NULL);
109 int max_gen_clk_probe(struct platform_device *pdev, struct regmap *regmap,
110 u32 reg, struct clk_init_data *clks_init, int num_init)
113 struct max_gen_clk *max_gen_clks;
115 struct device *dev = pdev->dev.parent;
116 const char *clk_name;
117 struct clk_init_data *init;
119 clocks = devm_kzalloc(dev, sizeof(struct clk *) * num_init, GFP_KERNEL);
123 max_gen_clks = devm_kzalloc(dev, sizeof(struct max_gen_clk)
124 * num_init, GFP_KERNEL);
128 for (i = 0; i < num_init; i++) {
129 max_gen_clks[i].regmap = regmap;
130 max_gen_clks[i].mask = 1 << i;
131 max_gen_clks[i].reg = reg;
133 init = devm_kzalloc(dev, sizeof(*init), GFP_KERNEL);
138 !of_property_read_string_index(dev->of_node,
139 "clock-output-names",
141 init->name = clk_name;
143 init->name = clks_init[i].name;
145 init->ops = clks_init[i].ops;
146 init->flags = clks_init[i].flags;
148 max_gen_clks[i].hw.init = init;
150 clocks[i] = max_gen_clk_register(dev, &max_gen_clks[i]);
151 if (IS_ERR(clocks[i])) {
152 ret = PTR_ERR(clocks[i]);
153 dev_err(dev, "failed to register %s\n",
154 max_gen_clks[i].hw.init->name);
159 platform_set_drvdata(pdev, clocks);
162 struct clk_onecell_data *of_data;
164 of_data = devm_kzalloc(dev, sizeof(*of_data), GFP_KERNEL);
168 of_data->clks = clocks;
169 of_data->clk_num = num_init;
170 ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get,
174 dev_err(dev, "failed to register OF clock provider\n");
181 EXPORT_SYMBOL_GPL(max_gen_clk_probe);
183 int max_gen_clk_remove(struct platform_device *pdev, int num_init)
185 struct device *dev = pdev->dev.parent;
188 of_clk_del_provider(dev->of_node);
192 EXPORT_SYMBOL_GPL(max_gen_clk_remove);