[deliverable/linux.git] / drivers / clk / clk-cs2000-cp.c

/*
 * CS2000  --  CIRRUS LOGIC Fractional-N Clock Synthesizer & Clock Multiplier
 *
 * Copyright (C) 2015 Renesas Electronics Corporation
 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/i2c.h>
#include <linux/of_device.h>
#include <linux/module.h>

#define CH_MAX 4
#define RATIO_REG_SIZE 4

#define DEVICE_ID	0x1
#define DEVICE_CTRL	0x2
#define DEVICE_CFG1	0x3
#define DEVICE_CFG2	0x4
#define GLOBAL_CFG	0x5
#define Ratio_Add(x, nth)	(6 + (x * 4) + (nth))
#define Ratio_Val(x, nth)	((x >> (24 - (8 * nth))) & 0xFF)
#define Val_Ratio(x, nth)	((x & 0xFF) << (24 - (8 * nth)))
#define FUNC_CFG1	0x16
#define FUNC_CFG2	0x17

/* DEVICE_ID */
#define REVISION_MASK	(0x7)
#define REVISION_B2_B3	(0x4)
#define REVISION_C1	(0x6)

/* DEVICE_CTRL */
#define PLL_UNLOCK	(1 << 7)

/* DEVICE_CFG1 */
#define RSEL(x)		(((x) & 0x3) << 3)
#define RSEL_MASK	RSEL(0x3)
#define ENDEV1		(0x1)

/* GLOBAL_CFG */
#define ENDEV2		(0x1)

#define CH_SIZE_ERR(ch)		((ch < 0) || (ch >= CH_MAX))
#define hw_to_priv(_hw)		container_of(_hw, struct cs2000_priv, hw)
#define priv_to_client(priv)	(priv->client)
#define priv_to_dev(priv)	(&(priv_to_client(priv)->dev))

#define CLK_IN	0
#define REF_CLK	1
#define CLK_MAX 2

struct cs2000_priv {
	struct clk_hw hw;
	struct i2c_client *client;
	struct clk *clk_in;
	struct clk *ref_clk;
	struct clk *clk_out;
};

static const struct of_device_id cs2000_of_match[] = {
	{ .compatible = "cirrus,cs2000-cp", },
	{},
};
MODULE_DEVICE_TABLE(of, cs2000_of_match);

static const struct i2c_device_id cs2000_id[] = {
	{ "cs2000-cp", },
	{}
};
MODULE_DEVICE_TABLE(i2c, cs2000_id);

#define cs2000_read(priv, addr) \
	i2c_smbus_read_byte_data(priv_to_client(priv), addr)
#define cs2000_write(priv, addr, val) \
	i2c_smbus_write_byte_data(priv_to_client(priv), addr, val)

static int cs2000_bset(struct cs2000_priv *priv, u8 addr, u8 mask, u8 val)
{
	s32 data;

	data = cs2000_read(priv, addr);
	if (data < 0)
		return data;

	data &= ~mask;
	data |= (val & mask);

	return cs2000_write(priv, addr, data);
}

static int cs2000_enable_dev_config(struct cs2000_priv *priv, bool enable)
{
	int ret;

	ret = cs2000_bset(priv, DEVICE_CFG1, ENDEV1,
			  enable ? ENDEV1 : 0);
	if (ret < 0)
		return ret;

	ret = cs2000_bset(priv, GLOBAL_CFG,  ENDEV2,
			  enable ? ENDEV2 : 0);
	if (ret < 0)
		return ret;

	return 0;
}

static int cs2000_clk_in_bound_rate(struct cs2000_priv *priv,
				    u32 rate_in)
{
	u32 val;

	if (rate_in >= 32000000 && rate_in < 56000000)
		val = 0x0;
	else if (rate_in >= 16000000 && rate_in < 28000000)
		val = 0x1;
	else if (rate_in >= 8000000 && rate_in < 14000000)
		val = 0x2;
	else
		return -EINVAL;

	return cs2000_bset(priv, FUNC_CFG1, 0x3 << 3, val << 3);
}

static int cs2000_wait_pll_lock(struct cs2000_priv *priv)
{
	struct device *dev = priv_to_dev(priv);
	s32 val;
	unsigned int i;

	for (i = 0; i < 256; i++) {
		val = cs2000_read(priv, DEVICE_CTRL);
		if (val < 0)
			return val;
		if (!(val & PLL_UNLOCK))
			return 0;
		udelay(1);
	}

	dev_err(dev, "pll lock failed\n");

	return -ETIMEDOUT;
}

static int cs2000_clk_out_enable(struct cs2000_priv *priv, bool enable)
{
	/* enable both AUX_OUT, CLK_OUT */
	return cs2000_write(priv, DEVICE_CTRL, enable ? 0 : 0x3);
}

static u32 cs2000_rate_to_ratio(u32 rate_in, u32 rate_out)
{
	u64 ratio;

	/*
	 * ratio = rate_out / rate_in * 2^20
	 *
	 * To avoid over flow, rate_out is u64.
	 * The result should be u32.
	 */
	ratio = (u64)rate_out << 20;
	do_div(ratio, rate_in);

	return ratio;
}

static unsigned long cs2000_ratio_to_rate(u32 ratio, u32 rate_in)
{
	u64 rate_out;

	/*
	 * ratio = rate_out / rate_in * 2^20
	 *
	 * To avoid over flow, rate_out is u64.
	 * The result should be u32 or unsigned long.
	 */

	rate_out = (u64)ratio * rate_in;
	return rate_out >> 20;
}

static int cs2000_ratio_set(struct cs2000_priv *priv,
			    int ch, u32 rate_in, u32 rate_out)
{
	u32 val;
	unsigned int i;
	int ret;

	if (CH_SIZE_ERR(ch))
		return -EINVAL;

	val = cs2000_rate_to_ratio(rate_in, rate_out);
	for (i = 0; i < RATIO_REG_SIZE; i++) {
		ret = cs2000_write(priv,
				   Ratio_Add(ch, i),
				   Ratio_Val(val, i));
		if (ret < 0)
			return ret;
	}

	return 0;
}

static u32 cs2000_ratio_get(struct cs2000_priv *priv, int ch)
{
	s32 tmp;
	u32 val;
	unsigned int i;

	val = 0;
	for (i = 0; i < RATIO_REG_SIZE; i++) {
		tmp = cs2000_read(priv, Ratio_Add(ch, i));
		if (tmp < 0)
			return 0;

		val |= Val_Ratio(tmp, i);
	}

	return val;
}

static int cs2000_ratio_select(struct cs2000_priv *priv, int ch)
{
	int ret;

	if (CH_SIZE_ERR(ch))
		return -EINVAL;

	/*
	 * FIXME
	 *
	 * this driver supports static ratio mode only at this point.
	 */
	ret = cs2000_bset(priv, DEVICE_CFG1, RSEL_MASK, RSEL(ch));
	if (ret < 0)
		return ret;

	ret = cs2000_write(priv, DEVICE_CFG2, 0x0);
	if (ret < 0)
		return ret;

	return 0;
}

static unsigned long cs2000_recalc_rate(struct clk_hw *hw,
					unsigned long parent_rate)
{
	struct cs2000_priv *priv = hw_to_priv(hw);
	int ch = 0; /* it uses ch0 only at this point */
	u32 ratio;

	ratio = cs2000_ratio_get(priv, ch);

	return cs2000_ratio_to_rate(ratio, parent_rate);
}

static long cs2000_round_rate(struct clk_hw *hw, unsigned long rate,
			      unsigned long *parent_rate)
{
	u32 ratio;

	ratio = cs2000_rate_to_ratio(*parent_rate, rate);

	return cs2000_ratio_to_rate(ratio, *parent_rate);
}

static int __cs2000_set_rate(struct cs2000_priv *priv, int ch,
			     unsigned long rate, unsigned long parent_rate)

{
	int ret;

	ret = cs2000_clk_in_bound_rate(priv, parent_rate);
	if (ret < 0)
		return ret;

	ret = cs2000_ratio_set(priv, ch, parent_rate, rate);
	if (ret < 0)
		return ret;

	ret = cs2000_ratio_select(priv, ch);
	if (ret < 0)
		return ret;

	return 0;
}

static int cs2000_set_rate(struct clk_hw *hw,
			   unsigned long rate, unsigned long parent_rate)
{
	struct cs2000_priv *priv = hw_to_priv(hw);
	int ch = 0; /* it uses ch0 only at this point */

	return __cs2000_set_rate(priv, ch, rate, parent_rate);
}

static int cs2000_enable(struct clk_hw *hw)
{
	struct cs2000_priv *priv = hw_to_priv(hw);
	int ret;

	ret = cs2000_enable_dev_config(priv, true);
	if (ret < 0)
		return ret;

	ret = cs2000_clk_out_enable(priv, true);
	if (ret < 0)
		return ret;

	ret = cs2000_wait_pll_lock(priv);
	if (ret < 0)
		return ret;

	return ret;
}

static void cs2000_disable(struct clk_hw *hw)
{
	struct cs2000_priv *priv = hw_to_priv(hw);

	cs2000_enable_dev_config(priv, false);

	cs2000_clk_out_enable(priv, false);
}

static u8 cs2000_get_parent(struct clk_hw *hw)
{
	/* always return REF_CLK */
	return REF_CLK;
}

static const struct clk_ops cs2000_ops = {
	.get_parent	= cs2000_get_parent,
	.recalc_rate	= cs2000_recalc_rate,
	.round_rate	= cs2000_round_rate,
	.set_rate	= cs2000_set_rate,
	.prepare	= cs2000_enable,
	.unprepare	= cs2000_disable,
};

static int cs2000_clk_get(struct cs2000_priv *priv)
{
	struct i2c_client *client = priv_to_client(priv);
	struct device *dev = &client->dev;
	struct clk *clk_in, *ref_clk;

	clk_in = devm_clk_get(dev, "clk_in");
	/* not yet provided */
	if (IS_ERR(clk_in))
		return -EPROBE_DEFER;

	ref_clk = devm_clk_get(dev, "ref_clk");
	/* not yet provided */
	if (IS_ERR(ref_clk))
		return -EPROBE_DEFER;

	priv->clk_in	= clk_in;
	priv->ref_clk	= ref_clk;

	return 0;
}

static int cs2000_clk_register(struct cs2000_priv *priv)
{
	struct device *dev = priv_to_dev(priv);
	struct device_node *np = dev->of_node;
	struct clk_init_data init;
	const char *name = np->name;
	struct clk *clk;
	static const char *parent_names[CLK_MAX];
	int ch = 0; /* it uses ch0 only at this point */
	int rate;
	int ret;

	of_property_read_string(np, "clock-output-names", &name);

	/*
	 * set default rate as 1/1.
	 * otherwise .set_rate which setup ratio
	 * is never called if user requests 1/1 rate
	 */
	rate = clk_get_rate(priv->ref_clk);
	ret = __cs2000_set_rate(priv, ch, rate, rate);
	if (ret < 0)
		return ret;

	parent_names[CLK_IN]	= __clk_get_name(priv->clk_in);
	parent_names[REF_CLK]	= __clk_get_name(priv->ref_clk);

	init.name		= name;
	init.ops		= &cs2000_ops;
	init.flags		= CLK_SET_RATE_GATE;
	init.parent_names	= parent_names;
	init.num_parents	= ARRAY_SIZE(parent_names);

	priv->hw.init = &init;

	clk = clk_register(dev, &priv->hw);
	if (IS_ERR(clk))
		return PTR_ERR(clk);

	ret = of_clk_add_provider(np, of_clk_src_simple_get, clk);
	if (ret < 0) {
		clk_unregister(clk);
		return ret;
	}

	priv->clk_out = clk;

	return 0;
}

static int cs2000_version_print(struct cs2000_priv *priv)
{
	struct i2c_client *client = priv_to_client(priv);
	struct device *dev = &client->dev;
	s32 val;
	const char *revision;

	val = cs2000_read(priv, DEVICE_ID);
	if (val < 0)
		return val;

	/* CS2000 should be 0x0 */
	if (val >> 3)
		return -EIO;

	switch (val & REVISION_MASK) {
	case REVISION_B2_B3:
		revision = "B2 / B3";
		break;
	case REVISION_C1:
		revision = "C1";
		break;
	default:
		return -EIO;
	}

	dev_info(dev, "revision - %s\n", revision);

	return 0;
}

static int cs2000_remove(struct i2c_client *client)
{
	struct cs2000_priv *priv = i2c_get_clientdata(client);
	struct device *dev = &client->dev;
	struct device_node *np = dev->of_node;

	of_clk_del_provider(np);

	clk_unregister(priv->clk_out);

	return 0;
}

static int cs2000_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct cs2000_priv *priv;
	struct device *dev = &client->dev;
	int ret;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->client = client;
	i2c_set_clientdata(client, priv);

	ret = cs2000_clk_get(priv);
	if (ret < 0)
		return ret;

	ret = cs2000_clk_register(priv);
	if (ret < 0)
		return ret;

	ret = cs2000_version_print(priv);
	if (ret < 0)
		goto probe_err;

	return 0;

probe_err:
	cs2000_remove(client);

	return ret;
}

static struct i2c_driver cs2000_driver = {
	.driver = {
		.name = "cs2000-cp",
		.of_match_table = cs2000_of_match,
	},
	.probe		= cs2000_probe,
	.remove		= cs2000_remove,
	.id_table	= cs2000_id,
};

module_i2c_driver(cs2000_driver);

MODULE_DESCRIPTION("CS2000-CP driver");
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
64dfbe24 KM	1	/*
	2	* CS2000 -- CIRRUS LOGIC Fractional-N Clock Synthesizer & Clock Multiplier
	3	*
	4	* Copyright (C) 2015 Renesas Electronics Corporation
	5	* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#include <linux/clk-provider.h>
	12	#include <linux/delay.h>
	13	#include <linux/clk.h>
	14	#include <linux/i2c.h>
	15	#include <linux/of_device.h>
	16	#include <linux/module.h>
	17
	18	#define CH_MAX 4
	19	#define RATIO_REG_SIZE 4
	20
	21	#define DEVICE_ID 0x1
	22	#define DEVICE_CTRL 0x2
	23	#define DEVICE_CFG1 0x3
	24	#define DEVICE_CFG2 0x4
	25	#define GLOBAL_CFG 0x5
	26	#define Ratio_Add(x, nth) (6 + (x * 4) + (nth))
	27	#define Ratio_Val(x, nth) ((x >> (24 - (8 * nth))) & 0xFF)
	28	#define Val_Ratio(x, nth) ((x & 0xFF) << (24 - (8 * nth)))
	29	#define FUNC_CFG1 0x16
	30	#define FUNC_CFG2 0x17
	31
	32	/* DEVICE_ID */
	33	#define REVISION_MASK (0x7)
	34	#define REVISION_B2_B3 (0x4)
	35	#define REVISION_C1 (0x6)
	36
	37	/* DEVICE_CTRL */
	38	#define PLL_UNLOCK (1 << 7)
	39
	40	/* DEVICE_CFG1 */
	41	#define RSEL(x) (((x) & 0x3) << 3)
	42	#define RSEL_MASK RSEL(0x3)
	43	#define ENDEV1 (0x1)
	44
	45	/* GLOBAL_CFG */
	46	#define ENDEV2 (0x1)
	47
	48	#define CH_SIZE_ERR(ch) ((ch < 0) \|\| (ch >= CH_MAX))
	49	#define hw_to_priv(_hw) container_of(_hw, struct cs2000_priv, hw)
	50	#define priv_to_client(priv) (priv->client)
	51	#define priv_to_dev(priv) (&(priv_to_client(priv)->dev))
	52
	53	#define CLK_IN 0
	54	#define REF_CLK 1
	55	#define CLK_MAX 2
	56
	57	struct cs2000_priv {
	58	struct clk_hw hw;
	59	struct i2c_client *client;
	60	struct clk *clk_in;
	61	struct clk *ref_clk;
	62	struct clk *clk_out;
	63	};
	64
65	static const struct of_device_id cs2000_of_match[] = {
66	{ .compatible = "cirrus,cs2000-cp", },
67	{},
68	};
69	MODULE_DEVICE_TABLE(of, cs2000_of_match);
70
71	static const struct i2c_device_id cs2000_id[] = {
72	{ "cs2000-cp", },
73	{}
74	};
75	MODULE_DEVICE_TABLE(i2c, cs2000_id);
76
77	#define cs2000_read(priv, addr) \
78	i2c_smbus_read_byte_data(priv_to_client(priv), addr)
79	#define cs2000_write(priv, addr, val) \
80	i2c_smbus_write_byte_data(priv_to_client(priv), addr, val)
81
82	static int cs2000_bset(struct cs2000_priv *priv, u8 addr, u8 mask, u8 val)
83	{
84	s32 data;
85
86	data = cs2000_read(priv, addr);
87	if (data < 0)
88	return data;
89
90	data &= ~mask;
91	data \|= (val & mask);
92
93	return cs2000_write(priv, addr, data);
94	}
95
96	static int cs2000_enable_dev_config(struct cs2000_priv *priv, bool enable)
97	{
98	int ret;
99
100	ret = cs2000_bset(priv, DEVICE_CFG1, ENDEV1,
101	enable ? ENDEV1 : 0);
102	if (ret < 0)
103	return ret;
104
105	ret = cs2000_bset(priv, GLOBAL_CFG, ENDEV2,
106	enable ? ENDEV2 : 0);
107	if (ret < 0)
108	return ret;
109
110	return 0;
111	}
112
113	static int cs2000_clk_in_bound_rate(struct cs2000_priv *priv,
114	u32 rate_in)
115	{
116	u32 val;
117
118	if (rate_in >= 32000000 && rate_in < 56000000)
119	val = 0x0;
120	else if (rate_in >= 16000000 && rate_in < 28000000)
121	val = 0x1;
122	else if (rate_in >= 8000000 && rate_in < 14000000)
123	val = 0x2;
124	else
125	return -EINVAL;
126
127	return cs2000_bset(priv, FUNC_CFG1, 0x3 << 3, val << 3);
128	}
129
130	static int cs2000_wait_pll_lock(struct cs2000_priv *priv)
131	{
132	struct device *dev = priv_to_dev(priv);
133	s32 val;
134	unsigned int i;
135
136	for (i = 0; i < 256; i++) {
137	val = cs2000_read(priv, DEVICE_CTRL);
138	if (val < 0)
139	return val;
140	if (!(val & PLL_UNLOCK))
141	return 0;
142	udelay(1);
143	}
144
145	dev_err(dev, "pll lock failed\n");
146
147	return -ETIMEDOUT;
148	}
149
150	static int cs2000_clk_out_enable(struct cs2000_priv *priv, bool enable)
151	{
152	/* enable both AUX_OUT, CLK_OUT */
153	return cs2000_write(priv, DEVICE_CTRL, enable ? 0 : 0x3);
154	}
155
156	static u32 cs2000_rate_to_ratio(u32 rate_in, u32 rate_out)
157	{
158	u64 ratio;
159
160	/*
161	* ratio = rate_out / rate_in * 2^20
162	*
163	* To avoid over flow, rate_out is u64.
164	* The result should be u32.
165	*/
166	ratio = (u64)rate_out << 20;
167	do_div(ratio, rate_in);
168
169	return ratio;
170	}
171
172	static unsigned long cs2000_ratio_to_rate(u32 ratio, u32 rate_in)
173	{
174	u64 rate_out;
175
176	/*
177	* ratio = rate_out / rate_in * 2^20
178	*
179	* To avoid over flow, rate_out is u64.
180	* The result should be u32 or unsigned long.
181	*/
182
183	rate_out = (u64)ratio * rate_in;
184	return rate_out >> 20;
185	}
186
187	static int cs2000_ratio_set(struct cs2000_priv *priv,
188	int ch, u32 rate_in, u32 rate_out)
189	{
190	u32 val;
191	unsigned int i;
192	int ret;
193
194	if (CH_SIZE_ERR(ch))
195	return -EINVAL;
196
197	val = cs2000_rate_to_ratio(rate_in, rate_out);
198	for (i = 0; i < RATIO_REG_SIZE; i++) {
199	ret = cs2000_write(priv,
200	Ratio_Add(ch, i),
201	Ratio_Val(val, i));
202	if (ret < 0)
203	return ret;
204	}
205
206	return 0;
207	}
208
209	static u32 cs2000_ratio_get(struct cs2000_priv *priv, int ch)
210	{
211	s32 tmp;
212	u32 val;
213	unsigned int i;
214
215	val = 0;
216	for (i = 0; i < RATIO_REG_SIZE; i++) {
217	tmp = cs2000_read(priv, Ratio_Add(ch, i));
218	if (tmp < 0)
219	return 0;
220
221	val \|= Val_Ratio(tmp, i);
222	}
223
224	return val;
225	}
226
227	static int cs2000_ratio_select(struct cs2000_priv *priv, int ch)
228	{
229	int ret;
230
231	if (CH_SIZE_ERR(ch))
232	return -EINVAL;
233
234	/*
235	* FIXME
236	*
237	* this driver supports static ratio mode only at this point.
238	*/
239	ret = cs2000_bset(priv, DEVICE_CFG1, RSEL_MASK, RSEL(ch));
240	if (ret < 0)
241	return ret;
242
243	ret = cs2000_write(priv, DEVICE_CFG2, 0x0);
244	if (ret < 0)
245	return ret;
246
247	return 0;
248	}
249
250	static unsigned long cs2000_recalc_rate(struct clk_hw *hw,
251	unsigned long parent_rate)
252	{
253	struct cs2000_priv *priv = hw_to_priv(hw);
254	int ch = 0; /* it uses ch0 only at this point */
255	u32 ratio;
256
257	ratio = cs2000_ratio_get(priv, ch);
258
259	return cs2000_ratio_to_rate(ratio, parent_rate);
260	}
261
262	static long cs2000_round_rate(struct clk_hw *hw, unsigned long rate,
263	unsigned long *parent_rate)
264	{
265	u32 ratio;
266
267	ratio = cs2000_rate_to_ratio(*parent_rate, rate);
268
269	return cs2000_ratio_to_rate(ratio, *parent_rate);
270	}
271
272	static int __cs2000_set_rate(struct cs2000_priv *priv, int ch,
273	unsigned long rate, unsigned long parent_rate)
274
275	{
276	int ret;
277
278	ret = cs2000_clk_in_bound_rate(priv, parent_rate);
279	if (ret < 0)
280	return ret;
281
282	ret = cs2000_ratio_set(priv, ch, parent_rate, rate);
283	if (ret < 0)
284	return ret;
285
286	ret = cs2000_ratio_select(priv, ch);
287	if (ret < 0)
288	return ret;
289
290	return 0;
291	}
292
293	static int cs2000_set_rate(struct clk_hw *hw,
294	unsigned long rate, unsigned long parent_rate)
295	{
296	struct cs2000_priv *priv = hw_to_priv(hw);
297	int ch = 0; /* it uses ch0 only at this point */
298
299	return __cs2000_set_rate(priv, ch, rate, parent_rate);
300	}
301
302	static int cs2000_enable(struct clk_hw *hw)
303	{
304	struct cs2000_priv *priv = hw_to_priv(hw);
305	int ret;
306
307	ret = cs2000_enable_dev_config(priv, true);
308	if (ret < 0)
309	return ret;
310
311	ret = cs2000_clk_out_enable(priv, true);
312	if (ret < 0)
313	return ret;
314
315	ret = cs2000_wait_pll_lock(priv);
316	if (ret < 0)
317	return ret;
318
319	return ret;
320	}
321
322	static void cs2000_disable(struct clk_hw *hw)
323	{
324	struct cs2000_priv *priv = hw_to_priv(hw);
325
326	cs2000_enable_dev_config(priv, false);
327
328	cs2000_clk_out_enable(priv, false);
329	}
330
331	static u8 cs2000_get_parent(struct clk_hw *hw)
332	{
333	/* always return REF_CLK */
334	return REF_CLK;
335	}
336
337	static const struct clk_ops cs2000_ops = {
338	.get_parent = cs2000_get_parent,
339	.recalc_rate = cs2000_recalc_rate,
340	.round_rate = cs2000_round_rate,
341	.set_rate = cs2000_set_rate,
342	.prepare = cs2000_enable,
343	.unprepare = cs2000_disable,
344	};
345
346	static int cs2000_clk_get(struct cs2000_priv *priv)
347	{
348	struct i2c_client *client = priv_to_client(priv);
349	struct device *dev = &client->dev;
350	struct clk clk_in, ref_clk;
351
352	clk_in = devm_clk_get(dev, "clk_in");
353	/* not yet provided */
354	if (IS_ERR(clk_in))
355	return -EPROBE_DEFER;
356
357	ref_clk = devm_clk_get(dev, "ref_clk");
358	/* not yet provided */
359	if (IS_ERR(ref_clk))
360	return -EPROBE_DEFER;
361
362	priv->clk_in = clk_in;
363	priv->ref_clk = ref_clk;
364
365	return 0;
366	}
367
368	static int cs2000_clk_register(struct cs2000_priv *priv)
369	{
370	struct device *dev = priv_to_dev(priv);
371	struct device_node *np = dev->of_node;
372	struct clk_init_data init;
373	const char *name = np->name;
374	struct clk *clk;
375	static const char *parent_names[CLK_MAX];
376	int ch = 0; /* it uses ch0 only at this point */
377	int rate;
378	int ret;
379
380	of_property_read_string(np, "clock-output-names", &name);
381
382	/*
383	* set default rate as 1/1.
384	* otherwise .set_rate which setup ratio
385	* is never called if user requests 1/1 rate
386	*/
387	rate = clk_get_rate(priv->ref_clk);
388	ret = __cs2000_set_rate(priv, ch, rate, rate);
389	if (ret < 0)
390	return ret;
391
392	parent_names[CLK_IN] = __clk_get_name(priv->clk_in);
393	parent_names[REF_CLK] = __clk_get_name(priv->ref_clk);
394
395	init.name = name;
396	init.ops = &cs2000_ops;
397	init.flags = CLK_SET_RATE_GATE;
398	init.parent_names = parent_names;
399	init.num_parents = ARRAY_SIZE(parent_names);
400
401	priv->hw.init = &init;
402
403	clk = clk_register(dev, &priv->hw);
404	if (IS_ERR(clk))
405	return PTR_ERR(clk);
406
407	ret = of_clk_add_provider(np, of_clk_src_simple_get, clk);
408	if (ret < 0) {
409	clk_unregister(clk);
410	return ret;
411	}
412
413	priv->clk_out = clk;
414
415	return 0;
416	}
417
418	static int cs2000_version_print(struct cs2000_priv *priv)
419	{
420	struct i2c_client *client = priv_to_client(priv);
421	struct device *dev = &client->dev;
422	s32 val;
423	const char *revision;
424
425	val = cs2000_read(priv, DEVICE_ID);
426	if (val < 0)
427	return val;
428
429	/* CS2000 should be 0x0 */
430	if (val >> 3)
431	return -EIO;
432
433	switch (val & REVISION_MASK) {
434	case REVISION_B2_B3:
435	revision = "B2 / B3";
436	break;
437	case REVISION_C1:
438	revision = "C1";
439	break;
440	default:
441	return -EIO;
442	}
443
444	dev_info(dev, "revision - %s\n", revision);
445
446	return 0;
447	}
448
449	static int cs2000_remove(struct i2c_client *client)
450	{
451	struct cs2000_priv *priv = i2c_get_clientdata(client);
452	struct device *dev = &client->dev;
453	struct device_node *np = dev->of_node;
454
455	of_clk_del_provider(np);
456
457	clk_unregister(priv->clk_out);
458
459	return 0;
460	}
461
462	static int cs2000_probe(struct i2c_client *client,
463	const struct i2c_device_id *id)
464	{
465	struct cs2000_priv *priv;
466	struct device *dev = &client->dev;
467	int ret;
468
469	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
470	if (!priv)
471	return -ENOMEM;
472
473	priv->client = client;
474	i2c_set_clientdata(client, priv);
475
476	ret = cs2000_clk_get(priv);
477	if (ret < 0)
478	return ret;
479
480	ret = cs2000_clk_register(priv);
481	if (ret < 0)
482	return ret;
483
484	ret = cs2000_version_print(priv);
485	if (ret < 0)
486	goto probe_err;
487
488	return 0;
489
490	probe_err:
491	cs2000_remove(client);
492
493	return ret;
494	}
495
496	static struct i2c_driver cs2000_driver = {
497	.driver = {
498	.name = "cs2000-cp",
499	.of_match_table = cs2000_of_match,
500	},
501	.probe = cs2000_probe,
502	.remove = cs2000_remove,
503	.id_table = cs2000_id,
504	};
505
506	module_i2c_driver(cs2000_driver);
507
508	MODULE_DESCRIPTION("CS2000-CP driver");
509	MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
510	MODULE_LICENSE("GPL v2");