1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Clock driver for Hi655x
4 *
5 * Copyright (c) 2017, Linaro Ltd.
6 *
7 * Author: Daniel Lezcano <daniel.lezcano@linaro.org>
8 */
9#include <linux/clk-provider.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/regmap.h>
13#include <linux/slab.h>
14#include <linux/mfd/core.h>
15#include <linux/mfd/hi655x-pmic.h>
16
17#define HI655X_CLK_BASE HI655X_BUS_ADDR(0x1c)
18#define HI655X_CLK_SET BIT(6)
19
20struct hi655x_clk {
21 struct hi655x_pmic *hi655x;
22 struct clk_hw clk_hw;
23};
24
25static unsigned long hi655x_clk_recalc_rate(struct clk_hw *hw,
26 unsigned long parent_rate)
27{
28 return 32768;
29}
30
31static int hi655x_clk_enable(struct clk_hw *hw, bool enable)
32{
33 struct hi655x_clk *hi655x_clk =
34 container_of(hw, struct hi655x_clk, clk_hw);
35
36 struct hi655x_pmic *hi655x = hi655x_clk->hi655x;
37
38 return regmap_update_bits(map: hi655x->regmap, HI655X_CLK_BASE,
39 HI655X_CLK_SET, val: enable ? HI655X_CLK_SET : 0);
40}
41
42static int hi655x_clk_prepare(struct clk_hw *hw)
43{
44 return hi655x_clk_enable(hw, enable: true);
45}
46
47static void hi655x_clk_unprepare(struct clk_hw *hw)
48{
49 hi655x_clk_enable(hw, enable: false);
50}
51
52static int hi655x_clk_is_prepared(struct clk_hw *hw)
53{
54 struct hi655x_clk *hi655x_clk =
55 container_of(hw, struct hi655x_clk, clk_hw);
56 struct hi655x_pmic *hi655x = hi655x_clk->hi655x;
57 int ret;
58 uint32_t val;
59
60 ret = regmap_read(map: hi655x->regmap, HI655X_CLK_BASE, val: &val);
61 if (ret < 0)
62 return ret;
63
64 return val & HI655X_CLK_BASE;
65}
66
67static const struct clk_ops hi655x_clk_ops = {
68 .prepare = hi655x_clk_prepare,
69 .unprepare = hi655x_clk_unprepare,
70 .is_prepared = hi655x_clk_is_prepared,
71 .recalc_rate = hi655x_clk_recalc_rate,
72};
73
74static int hi655x_clk_probe(struct platform_device *pdev)
75{
76 struct device *parent = pdev->dev.parent;
77 struct hi655x_pmic *hi655x = dev_get_drvdata(dev: parent);
78 struct hi655x_clk *hi655x_clk;
79 const char *clk_name = "hi655x-clk";
80 struct clk_init_data init = {
81 .name = clk_name,
82 .ops = &hi655x_clk_ops
83 };
84 int ret;
85
86 hi655x_clk = devm_kzalloc(dev: &pdev->dev, size: sizeof(*hi655x_clk), GFP_KERNEL);
87 if (!hi655x_clk)
88 return -ENOMEM;
89
90 of_property_read_string_index(np: parent->of_node, propname: "clock-output-names",
91 index: 0, output: &clk_name);
92
93 hi655x_clk->clk_hw.init = &init;
94 hi655x_clk->hi655x = hi655x;
95
96 platform_set_drvdata(pdev, data: hi655x_clk);
97
98 ret = devm_clk_hw_register(dev: &pdev->dev, hw: &hi655x_clk->clk_hw);
99 if (ret)
100 return ret;
101
102 return devm_of_clk_add_hw_provider(dev: &pdev->dev, get: of_clk_hw_simple_get,
103 data: &hi655x_clk->clk_hw);
104}
105
106static struct platform_driver hi655x_clk_driver = {
107 .probe = hi655x_clk_probe,
108 .driver = {
109 .name = "hi655x-clk",
110 },
111};
112
113module_platform_driver(hi655x_clk_driver);
114
115MODULE_DESCRIPTION("Clk driver for the hi655x series PMICs");
116MODULE_AUTHOR("Daniel Lezcano <daniel.lezcano@linaro.org>");
117MODULE_LICENSE("GPL");
118MODULE_ALIAS("platform:hi655x-clk");
119

source code of linux/drivers/clk/clk-hi655x.c