tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
29struct twl6040_pdmclk {
30 struct twl6040 *twl6040;
31 struct device *dev;
32 struct clk_hw pdmclk_hw;
33 int enabled;
34};
35
36static 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
44static 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
57static 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
69static 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
78static 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
85static const struct clk_init_data twl6040_pdmclk_init = {
86 .name = "pdmclk",
87 .ops = &twl6040_pdmclk_ops,
88 .flags = CLK_GET_RATE_NOCACHE,
89};
90
91static 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 devm_of_clk_add_hw_provider(&pdev->dev, of_clk_hw_simple_get,
112 &clkdata->pdmclk_hw);
113}
114
115static struct platform_driver twl6040_pdmclk_driver = {
116 .driver = {
117 .name = "twl6040-pdmclk",
118 },
119 .probe = twl6040_pdmclk_probe,
120};
121
122module_platform_driver(twl6040_pdmclk_driver);
123
124MODULE_DESCRIPTION("TWL6040 clock driver for McPDM functional clock");
125MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
126MODULE_ALIAS("platform:twl6040-pdmclk");
127MODULE_LICENSE("GPL");