Git Repo - linux.git/blame_incremental - drivers/clk/clk-twl6040.c

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Commit	Line	Data
	1	/*
	2	* TWL6040 clock module driver for OMAP4 McPDM functional clock
	3	*
	4	* Copyright (C) 2012 Texas Instruments Inc.
	5	* Peter Ujfalusi <[email protected]>
	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 <[email protected]>");
	127	MODULE_ALIAS("platform:twl6040-pdmclk");
	128	MODULE_LICENSE("GPL");