Merge tag 'perf-core-for-mingo-4.17-20180413' of git://git.kernel.org/pub/scm/linux...
[linux-2.6-microblaze.git] / drivers / clk / clk-twl6040.c
1 /*
2 * TWL6040 clock module driver for OMAP4 McPDM functional clock
3 *
4 * Copyright (C) 2012 Texas Instruments Inc.
5 * Peter Ujfalusi <peter.ujfalusi@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * version 2 as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
19 * 02110-1301 USA
20 *
21 */
22
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/platform_device.h>
26 #include <linux/mfd/twl6040.h>
27 #include <linux/clk-provider.h>
28
29 struct twl6040_pdmclk {
30         struct twl6040 *twl6040;
31         struct device *dev;
32         struct clk_hw pdmclk_hw;
33         int enabled;
34 };
35
36 static int twl6040_pdmclk_is_prepared(struct clk_hw *hw)
37 {
38         struct twl6040_pdmclk *pdmclk = container_of(hw, struct twl6040_pdmclk,
39                                                      pdmclk_hw);
40
41         return pdmclk->enabled;
42 }
43
44 static int twl6040_pdmclk_prepare(struct clk_hw *hw)
45 {
46         struct twl6040_pdmclk *pdmclk = container_of(hw, struct twl6040_pdmclk,
47                                                      pdmclk_hw);
48         int ret;
49
50         ret = twl6040_power(pdmclk->twl6040, 1);
51         if (!ret)
52                 pdmclk->enabled = 1;
53
54         return ret;
55 }
56
57 static void twl6040_pdmclk_unprepare(struct clk_hw *hw)
58 {
59         struct twl6040_pdmclk *pdmclk = container_of(hw, struct twl6040_pdmclk,
60                                                      pdmclk_hw);
61         int ret;
62
63         ret = twl6040_power(pdmclk->twl6040, 0);
64         if (!ret)
65                 pdmclk->enabled = 0;
66
67 }
68
69 static unsigned long twl6040_pdmclk_recalc_rate(struct clk_hw *hw,
70                                                 unsigned long parent_rate)
71 {
72         struct twl6040_pdmclk *pdmclk = container_of(hw, struct twl6040_pdmclk,
73                                                      pdmclk_hw);
74
75         return twl6040_get_sysclk(pdmclk->twl6040);
76 }
77
78 static const struct clk_ops twl6040_pdmclk_ops = {
79         .is_prepared = twl6040_pdmclk_is_prepared,
80         .prepare = twl6040_pdmclk_prepare,
81         .unprepare = twl6040_pdmclk_unprepare,
82         .recalc_rate = twl6040_pdmclk_recalc_rate,
83 };
84
85 static const struct clk_init_data twl6040_pdmclk_init = {
86         .name = "pdmclk",
87         .ops = &twl6040_pdmclk_ops,
88         .flags = CLK_GET_RATE_NOCACHE,
89 };
90
91 static int twl6040_pdmclk_probe(struct platform_device *pdev)
92 {
93         struct twl6040 *twl6040 = dev_get_drvdata(pdev->dev.parent);
94         struct twl6040_pdmclk *clkdata;
95         int ret;
96
97         clkdata = devm_kzalloc(&pdev->dev, sizeof(*clkdata), GFP_KERNEL);
98         if (!clkdata)
99                 return -ENOMEM;
100
101         clkdata->dev = &pdev->dev;
102         clkdata->twl6040 = twl6040;
103
104         clkdata->pdmclk_hw.init = &twl6040_pdmclk_init;
105         ret = devm_clk_hw_register(&pdev->dev, &clkdata->pdmclk_hw);
106         if (ret)
107                 return ret;
108
109         platform_set_drvdata(pdev, clkdata);
110
111         return of_clk_add_hw_provider(pdev->dev.parent->of_node,
112                                       of_clk_hw_simple_get,
113                                       &clkdata->pdmclk_hw);
114 }
115
116 static struct platform_driver twl6040_pdmclk_driver = {
117         .driver = {
118                 .name = "twl6040-pdmclk",
119         },
120         .probe = twl6040_pdmclk_probe,
121 };
122
123 module_platform_driver(twl6040_pdmclk_driver);
124
125 MODULE_DESCRIPTION("TWL6040 clock driver for McPDM functional clock");
126 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
127 MODULE_ALIAS("platform:twl6040-pdmclk");
128 MODULE_LICENSE("GPL");