2 * TWL6040 clock module driver for OMAP4 McPDM functional clock
4 * Copyright (C) 2012 Texas Instruments Inc.
5 * Peter Ujfalusi <peter.ujfalusi@ti.com>
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.
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.
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
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>
29 struct twl6040_pdmclk {
30 struct twl6040 *twl6040;
32 struct clk_hw pdmclk_hw;
37 static int twl6040_pdmclk_is_prepared(struct clk_hw *hw)
39 struct twl6040_pdmclk *pdmclk = container_of(hw, struct twl6040_pdmclk,
42 return pdmclk->enabled;
45 static int twl6040_pdmclk_prepare(struct clk_hw *hw)
47 struct twl6040_pdmclk *pdmclk = container_of(hw, struct twl6040_pdmclk,
51 ret = twl6040_power(pdmclk->twl6040, 1);
58 static void twl6040_pdmclk_unprepare(struct clk_hw *hw)
60 struct twl6040_pdmclk *pdmclk = container_of(hw, struct twl6040_pdmclk,
64 ret = twl6040_power(pdmclk->twl6040, 0);
70 static unsigned long twl6040_pdmclk_recalc_rate(struct clk_hw *hw,
71 unsigned long parent_rate)
73 struct twl6040_pdmclk *pdmclk = container_of(hw, struct twl6040_pdmclk,
76 return twl6040_get_sysclk(pdmclk->twl6040);
79 static const struct clk_ops twl6040_pdmclk_ops = {
80 .is_prepared = twl6040_pdmclk_is_prepared,
81 .prepare = twl6040_pdmclk_prepare,
82 .unprepare = twl6040_pdmclk_unprepare,
83 .recalc_rate = twl6040_pdmclk_recalc_rate,
86 static struct clk_init_data twl6040_pdmclk_init = {
88 .ops = &twl6040_pdmclk_ops,
89 .flags = CLK_GET_RATE_NOCACHE,
92 static int twl6040_pdmclk_probe(struct platform_device *pdev)
94 struct twl6040 *twl6040 = dev_get_drvdata(pdev->dev.parent);
95 struct twl6040_pdmclk *clkdata;
97 clkdata = devm_kzalloc(&pdev->dev, sizeof(*clkdata), GFP_KERNEL);
101 clkdata->dev = &pdev->dev;
102 clkdata->twl6040 = twl6040;
104 clkdata->pdmclk_hw.init = &twl6040_pdmclk_init;
105 clkdata->clk = devm_clk_register(&pdev->dev, &clkdata->pdmclk_hw);
106 if (IS_ERR(clkdata->clk))
107 return PTR_ERR(clkdata->clk);
109 platform_set_drvdata(pdev, clkdata);
111 return of_clk_add_provider(pdev->dev.parent->of_node,
112 of_clk_src_simple_get, clkdata->clk);
115 static struct platform_driver twl6040_pdmclk_driver = {
117 .name = "twl6040-pdmclk",
119 .probe = twl6040_pdmclk_probe,
122 module_platform_driver(twl6040_pdmclk_driver);
124 MODULE_DESCRIPTION("TWL6040 clock driver for McPDM functional clock");
125 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
126 MODULE_ALIAS("platform:twl6040-pdmclk");
127 MODULE_LICENSE("GPL");