[linux-block.git] / drivers / pwm / pwm-berlin.c

/*
 * Marvell Berlin PWM driver
 *
 * Copyright (C) 2015 Marvell Technology Group Ltd.
 *
 * Author: Antoine Tenart <antoine.tenart@free-electrons.com>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/clk.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/slab.h>

#define BERLIN_PWM_EN			0x0
#define  BERLIN_PWM_ENABLE		BIT(0)
#define BERLIN_PWM_CONTROL		0x4
/*
 * The prescaler claims to support 8 different moduli, configured using the
 * low three bits of PWM_CONTROL. (Sequentially, they are 1, 4, 8, 16, 64,
 * 256, 1024, and 4096.)  However, the moduli from 4 to 1024 appear to be
 * implemented by internally shifting TCNT left without adding additional
 * bits. So, the max TCNT that actually works for a modulus of 4 is 0x3fff;
 * for 8, 0x1fff; and so on. This means that those moduli are entirely
 * useless, as we could just do the shift ourselves. The 4096 modulus is
 * implemented with a real prescaler, so we do use that, but we treat it
 * as a flag instead of pretending the modulus is actually configurable.
 */
#define  BERLIN_PWM_PRESCALE_4096	0x7
#define  BERLIN_PWM_INVERT_POLARITY	BIT(3)
#define BERLIN_PWM_DUTY			0x8
#define BERLIN_PWM_TCNT			0xc
#define  BERLIN_PWM_MAX_TCNT		65535

#define BERLIN_PWM_NUMPWMS		4

struct berlin_pwm_channel {
	u32 enable;
	u32 ctrl;
	u32 duty;
	u32 tcnt;
};

struct berlin_pwm_chip {
	struct clk *clk;
	void __iomem *base;
	struct berlin_pwm_channel channel[BERLIN_PWM_NUMPWMS];
};

static inline struct berlin_pwm_chip *to_berlin_pwm_chip(struct pwm_chip *chip)
{
	return pwmchip_get_drvdata(chip);
}

static inline u32 berlin_pwm_readl(struct berlin_pwm_chip *bpc,
				   unsigned int channel, unsigned long offset)
{
	return readl_relaxed(bpc->base + channel * 0x10 + offset);
}

static inline void berlin_pwm_writel(struct berlin_pwm_chip *bpc,
				     unsigned int channel, u32 value,
				     unsigned long offset)
{
	writel_relaxed(value, bpc->base + channel * 0x10 + offset);
}

static int berlin_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
			     u64 duty_ns, u64 period_ns)
{
	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
	bool prescale_4096 = false;
	u32 value, duty, period;
	u64 cycles;

	cycles = clk_get_rate(bpc->clk);
	cycles *= period_ns;
	do_div(cycles, NSEC_PER_SEC);

	if (cycles > BERLIN_PWM_MAX_TCNT) {
		prescale_4096 = true;
		cycles >>= 12; // Prescaled by 4096

		if (cycles > BERLIN_PWM_MAX_TCNT)
			return -ERANGE;
	}

	period = cycles;
	cycles *= duty_ns;
	do_div(cycles, period_ns);
	duty = cycles;

	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_CONTROL);
	if (prescale_4096)
		value |= BERLIN_PWM_PRESCALE_4096;
	else
		value &= ~BERLIN_PWM_PRESCALE_4096;
	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_CONTROL);

	berlin_pwm_writel(bpc, pwm->hwpwm, duty, BERLIN_PWM_DUTY);
	berlin_pwm_writel(bpc, pwm->hwpwm, period, BERLIN_PWM_TCNT);

	return 0;
}

static int berlin_pwm_set_polarity(struct pwm_chip *chip,
				   struct pwm_device *pwm,
				   enum pwm_polarity polarity)
{
	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
	u32 value;

	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_CONTROL);

	if (polarity == PWM_POLARITY_NORMAL)
		value &= ~BERLIN_PWM_INVERT_POLARITY;
	else
		value |= BERLIN_PWM_INVERT_POLARITY;

	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_CONTROL);

	return 0;
}

static int berlin_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
	u32 value;

	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_EN);
	value |= BERLIN_PWM_ENABLE;
	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_EN);

	return 0;
}

static void berlin_pwm_disable(struct pwm_chip *chip,
			       struct pwm_device *pwm)
{
	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
	u32 value;

	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_EN);
	value &= ~BERLIN_PWM_ENABLE;
	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_EN);
}

static int berlin_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
			    const struct pwm_state *state)
{
	int err;
	bool enabled = pwm->state.enabled;

	if (state->polarity != pwm->state.polarity) {
		if (enabled) {
			berlin_pwm_disable(chip, pwm);
			enabled = false;
		}

		err = berlin_pwm_set_polarity(chip, pwm, state->polarity);
		if (err)
			return err;
	}

	if (!state->enabled) {
		if (enabled)
			berlin_pwm_disable(chip, pwm);
		return 0;
	}

	err = berlin_pwm_config(chip, pwm, state->duty_cycle, state->period);
	if (err)
		return err;

	if (!enabled)
		return berlin_pwm_enable(chip, pwm);

	return 0;
}

static const struct pwm_ops berlin_pwm_ops = {
	.apply = berlin_pwm_apply,
};

static const struct of_device_id berlin_pwm_match[] = {
	{ .compatible = "marvell,berlin-pwm" },
	{ },
};
MODULE_DEVICE_TABLE(of, berlin_pwm_match);

static int berlin_pwm_probe(struct platform_device *pdev)
{
	struct pwm_chip *chip;
	struct berlin_pwm_chip *bpc;
	int ret;

	chip = devm_pwmchip_alloc(&pdev->dev, BERLIN_PWM_NUMPWMS, sizeof(*bpc));
	if (IS_ERR(chip))
		return PTR_ERR(chip);
	bpc = to_berlin_pwm_chip(chip);

	bpc->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(bpc->base))
		return PTR_ERR(bpc->base);

	bpc->clk = devm_clk_get_enabled(&pdev->dev, NULL);
	if (IS_ERR(bpc->clk))
		return PTR_ERR(bpc->clk);

	chip->ops = &berlin_pwm_ops;

	ret = devm_pwmchip_add(&pdev->dev, chip);
	if (ret < 0)
		return dev_err_probe(&pdev->dev, ret, "failed to add PWM chip\n");

	platform_set_drvdata(pdev, chip);

	return 0;
}

static int berlin_pwm_suspend(struct device *dev)
{
	struct pwm_chip *chip = dev_get_drvdata(dev);
	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
	unsigned int i;

	for (i = 0; i < chip->npwm; i++) {
		struct berlin_pwm_channel *channel = &bpc->channel[i];

		channel->enable = berlin_pwm_readl(bpc, i, BERLIN_PWM_ENABLE);
		channel->ctrl = berlin_pwm_readl(bpc, i, BERLIN_PWM_CONTROL);
		channel->duty = berlin_pwm_readl(bpc, i, BERLIN_PWM_DUTY);
		channel->tcnt = berlin_pwm_readl(bpc, i, BERLIN_PWM_TCNT);
	}

	clk_disable_unprepare(bpc->clk);

	return 0;
}

static int berlin_pwm_resume(struct device *dev)
{
	struct pwm_chip *chip = dev_get_drvdata(dev);
	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
	unsigned int i;
	int ret;

	ret = clk_prepare_enable(bpc->clk);
	if (ret)
		return ret;

	for (i = 0; i < chip->npwm; i++) {
		struct berlin_pwm_channel *channel = &bpc->channel[i];

		berlin_pwm_writel(bpc, i, channel->ctrl, BERLIN_PWM_CONTROL);
		berlin_pwm_writel(bpc, i, channel->duty, BERLIN_PWM_DUTY);
		berlin_pwm_writel(bpc, i, channel->tcnt, BERLIN_PWM_TCNT);
		berlin_pwm_writel(bpc, i, channel->enable, BERLIN_PWM_ENABLE);
	}

	return 0;
}

static DEFINE_SIMPLE_DEV_PM_OPS(berlin_pwm_pm_ops, berlin_pwm_suspend,
				berlin_pwm_resume);

static struct platform_driver berlin_pwm_driver = {
	.probe = berlin_pwm_probe,
	.driver = {
		.name = "berlin-pwm",
		.of_match_table = berlin_pwm_match,
		.pm = pm_ptr(&berlin_pwm_pm_ops),
	},
};
module_platform_driver(berlin_pwm_driver);

MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
MODULE_DESCRIPTION("Marvell Berlin PWM driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
59d5c8b1 AT	1	/*
	2	* Marvell Berlin PWM driver
	3	*
	4	* Copyright (C) 2015 Marvell Technology Group Ltd.
	5	*
	6	* Author: Antoine Tenart <antoine.tenart@free-electrons.com>
	7	*
	8	* This file is licensed under the terms of the GNU General Public
	9	* License version 2. This program is licensed "as is" without any
	10	* warranty of any kind, whether express or implied.
	11	*/
	12
	13	#include <linux/clk.h>
	14	#include <linux/io.h>
	15	#include <linux/kernel.h>
0a41b0c5	16	#include <linux/mod_devicetable.h>
59d5c8b1 AT	17	#include <linux/module.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/pwm.h>
bbf0722c	20	#include <linux/slab.h>
59d5c8b1 AT	21
	22	#define BERLIN_PWM_EN 0x0
	23	#define BERLIN_PWM_ENABLE BIT(0)
	24	#define BERLIN_PWM_CONTROL 0x4
4de445cb TH	25	/*
	26	* The prescaler claims to support 8 different moduli, configured using the
	27	* low three bits of PWM_CONTROL. (Sequentially, they are 1, 4, 8, 16, 64,
	28	* 256, 1024, and 4096.) However, the moduli from 4 to 1024 appear to be
	29	* implemented by internally shifting TCNT left without adding additional
	30	* bits. So, the max TCNT that actually works for a modulus of 4 is 0x3fff;
	31	* for 8, 0x1fff; and so on. This means that those moduli are entirely
	32	* useless, as we could just do the shift ourselves. The 4096 modulus is
	33	* implemented with a real prescaler, so we do use that, but we treat it
	34	* as a flag instead of pretending the modulus is actually configurable.
	35	*/
	36	#define BERLIN_PWM_PRESCALE_4096 0x7
59d5c8b1 AT	37	#define BERLIN_PWM_INVERT_POLARITY BIT(3)
	38	#define BERLIN_PWM_DUTY 0x8
	39	#define BERLIN_PWM_TCNT 0xc
	40	#define BERLIN_PWM_MAX_TCNT 65535
	41
1b2af7bb UKK	42	#define BERLIN_PWM_NUMPWMS 4
1b2af7bb UKK	43
bbf0722c JZ	44	struct berlin_pwm_channel {
	45	u32 enable;
	46	u32 ctrl;
	47	u32 duty;
	48	u32 tcnt;
	49	};
	50
59d5c8b1	51	struct berlin_pwm_chip {
59d5c8b1 AT	52	struct clk *clk;
59d5c8b1 AT	53	void __iomem *base;
1b2af7bb	54	struct berlin_pwm_channel channel[BERLIN_PWM_NUMPWMS];
59d5c8b1 AT	55	};
	56
	57	static inline struct berlin_pwm_chip to_berlin_pwm_chip(struct pwm_chip chip)
	58	{
bf756bfd	59	return pwmchip_get_drvdata(chip);
59d5c8b1 AT	60	}
59d5c8b1 AT	61
3f3e8051	62	static inline u32 berlin_pwm_readl(struct berlin_pwm_chip *bpc,
59d5c8b1 AT	63	unsigned int channel, unsigned long offset)
59d5c8b1 AT	64	{
3f3e8051	65	return readl_relaxed(bpc->base + channel * 0x10 + offset);
59d5c8b1 AT	66	}
59d5c8b1 AT	67
3f3e8051	68	static inline void berlin_pwm_writel(struct berlin_pwm_chip *bpc,
59d5c8b1 AT	69	unsigned int channel, u32 value,
	70	unsigned long offset)
	71	{
3f3e8051	72	writel_relaxed(value, bpc->base + channel * 0x10 + offset);
59d5c8b1 AT	73	}
59d5c8b1 AT	74
3f3e8051	75	static int berlin_pwm_config(struct pwm_chip chip, struct pwm_device pwm,
30dffb42	76	u64 duty_ns, u64 period_ns)
59d5c8b1	77	{
3f3e8051	78	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
4de445cb	79	bool prescale_4096 = false;
59d5c8b1	80	u32 value, duty, period;
4de445cb	81	u64 cycles;
59d5c8b1	82
3f3e8051	83	cycles = clk_get_rate(bpc->clk);
59d5c8b1 AT	84	cycles *= period_ns;
	85	do_div(cycles, NSEC_PER_SEC);
	86
4de445cb TH	87	if (cycles > BERLIN_PWM_MAX_TCNT) {
	88	prescale_4096 = true;
	89	cycles >>= 12; // Prescaled by 4096
59d5c8b1	90
4de445cb TH	91	if (cycles > BERLIN_PWM_MAX_TCNT)
4de445cb TH	92	return -ERANGE;
59d5c8b1 AT	93	}
59d5c8b1 AT	94
4de445cb TH	95	period = cycles;
4de445cb TH	96	cycles *= duty_ns;
59d5c8b1 AT	97	do_div(cycles, period_ns);
	98	duty = cycles;
	99
3f3e8051	100	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_CONTROL);
4de445cb TH	101	if (prescale_4096)
	102	value \|= BERLIN_PWM_PRESCALE_4096;
	103	else
	104	value &= ~BERLIN_PWM_PRESCALE_4096;
3f3e8051	105	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_CONTROL);
59d5c8b1	106
3f3e8051 UKK	107	berlin_pwm_writel(bpc, pwm->hwpwm, duty, BERLIN_PWM_DUTY);
3f3e8051 UKK	108	berlin_pwm_writel(bpc, pwm->hwpwm, period, BERLIN_PWM_TCNT);
59d5c8b1 AT	109
	110	return 0;
	111	}
	112
	113	static int berlin_pwm_set_polarity(struct pwm_chip *chip,
3f3e8051	114	struct pwm_device *pwm,
59d5c8b1 AT	115	enum pwm_polarity polarity)
59d5c8b1 AT	116	{
3f3e8051	117	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
59d5c8b1 AT	118	u32 value;
59d5c8b1 AT	119
3f3e8051	120	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_CONTROL);
59d5c8b1 AT	121
	122	if (polarity == PWM_POLARITY_NORMAL)
	123	value &= ~BERLIN_PWM_INVERT_POLARITY;
	124	else
	125	value \|= BERLIN_PWM_INVERT_POLARITY;
	126
3f3e8051	127	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_CONTROL);
59d5c8b1 AT	128
	129	return 0;
	130	}
	131
3f3e8051	132	static int berlin_pwm_enable(struct pwm_chip chip, struct pwm_device pwm)
59d5c8b1	133	{
3f3e8051	134	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
59d5c8b1 AT	135	u32 value;
59d5c8b1 AT	136
3f3e8051	137	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_EN);
59d5c8b1	138	value \|= BERLIN_PWM_ENABLE;
3f3e8051	139	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_EN);
59d5c8b1 AT	140
	141	return 0;
	142	}
	143
	144	static void berlin_pwm_disable(struct pwm_chip *chip,
3f3e8051	145	struct pwm_device *pwm)
59d5c8b1	146	{
3f3e8051	147	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
59d5c8b1 AT	148	u32 value;
59d5c8b1 AT	149
3f3e8051	150	value = berlin_pwm_readl(bpc, pwm->hwpwm, BERLIN_PWM_EN);
59d5c8b1	151	value &= ~BERLIN_PWM_ENABLE;
3f3e8051	152	berlin_pwm_writel(bpc, pwm->hwpwm, value, BERLIN_PWM_EN);
59d5c8b1 AT	153	}
59d5c8b1 AT	154
30dffb42 UKK	155	static int berlin_pwm_apply(struct pwm_chip chip, struct pwm_device pwm,
	156	const struct pwm_state *state)
	157	{
	158	int err;
	159	bool enabled = pwm->state.enabled;
	160
	161	if (state->polarity != pwm->state.polarity) {
	162	if (enabled) {
	163	berlin_pwm_disable(chip, pwm);
	164	enabled = false;
	165	}
	166
	167	err = berlin_pwm_set_polarity(chip, pwm, state->polarity);
	168	if (err)
	169	return err;
	170	}
	171
	172	if (!state->enabled) {
	173	if (enabled)
	174	berlin_pwm_disable(chip, pwm);
	175	return 0;
	176	}
	177
7d6d4aaf UKK	178	err = berlin_pwm_config(chip, pwm, state->duty_cycle, state->period);
	179	if (err)
	180	return err;
30dffb42 UKK	181
	182	if (!enabled)
	183	return berlin_pwm_enable(chip, pwm);
	184
	185	return 0;
	186	}
	187
59d5c8b1	188	static const struct pwm_ops berlin_pwm_ops = {
30dffb42	189	.apply = berlin_pwm_apply,
59d5c8b1 AT	190	};
	191
	192	static const struct of_device_id berlin_pwm_match[] = {
	193	{ .compatible = "marvell,berlin-pwm" },
	194	{ },
	195	};
	196	MODULE_DEVICE_TABLE(of, berlin_pwm_match);
	197
	198	static int berlin_pwm_probe(struct platform_device *pdev)
	199	{
5874eaf8	200	struct pwm_chip *chip;
3f3e8051	201	struct berlin_pwm_chip *bpc;
59d5c8b1 AT	202	int ret;
59d5c8b1 AT	203
bf756bfd UKK	204	chip = devm_pwmchip_alloc(&pdev->dev, BERLIN_PWM_NUMPWMS, sizeof(*bpc));
	205	if (IS_ERR(chip))
	206	return PTR_ERR(chip);
	207	bpc = to_berlin_pwm_chip(chip);
59d5c8b1	208
3f3e8051 UKK	209	bpc->base = devm_platform_ioremap_resource(pdev, 0);
	210	if (IS_ERR(bpc->base))
	211	return PTR_ERR(bpc->base);
59d5c8b1	212
6dbf23f5	213	bpc->clk = devm_clk_get_enabled(&pdev->dev, NULL);
3f3e8051 UKK	214	if (IS_ERR(bpc->clk))
3f3e8051 UKK	215	return PTR_ERR(bpc->clk);
59d5c8b1	216
5874eaf8	217	chip->ops = &berlin_pwm_ops;
59d5c8b1	218
5874eaf8	219	ret = devm_pwmchip_add(&pdev->dev, chip);
6dbf23f5 UKK	220	if (ret < 0)
6dbf23f5 UKK	221	return dev_err_probe(&pdev->dev, ret, "failed to add PWM chip\n");
59d5c8b1	222
5874eaf8	223	platform_set_drvdata(pdev, chip);
59d5c8b1 AT	224
	225	return 0;
	226	}
	227
bbf0722c JZ	228	static int berlin_pwm_suspend(struct device *dev)
bbf0722c JZ	229	{
5874eaf8 UKK	230	struct pwm_chip *chip = dev_get_drvdata(dev);
5874eaf8 UKK	231	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
bbf0722c JZ	232	unsigned int i;
bbf0722c JZ	233
5874eaf8	234	for (i = 0; i < chip->npwm; i++) {
1b2af7bb	235	struct berlin_pwm_channel *channel = &bpc->channel[i];
bbf0722c	236
3f3e8051 UKK	237	channel->enable = berlin_pwm_readl(bpc, i, BERLIN_PWM_ENABLE);
	238	channel->ctrl = berlin_pwm_readl(bpc, i, BERLIN_PWM_CONTROL);
	239	channel->duty = berlin_pwm_readl(bpc, i, BERLIN_PWM_DUTY);
	240	channel->tcnt = berlin_pwm_readl(bpc, i, BERLIN_PWM_TCNT);
bbf0722c JZ	241	}
bbf0722c JZ	242
3f3e8051	243	clk_disable_unprepare(bpc->clk);
bbf0722c JZ	244
	245	return 0;
	246	}
	247
	248	static int berlin_pwm_resume(struct device *dev)
	249	{
5874eaf8 UKK	250	struct pwm_chip *chip = dev_get_drvdata(dev);
5874eaf8 UKK	251	struct berlin_pwm_chip *bpc = to_berlin_pwm_chip(chip);
bbf0722c JZ	252	unsigned int i;
	253	int ret;
	254
3f3e8051	255	ret = clk_prepare_enable(bpc->clk);
bbf0722c JZ	256	if (ret)
	257	return ret;
	258
5874eaf8	259	for (i = 0; i < chip->npwm; i++) {
1b2af7bb	260	struct berlin_pwm_channel *channel = &bpc->channel[i];
bbf0722c	261
3f3e8051 UKK	262	berlin_pwm_writel(bpc, i, channel->ctrl, BERLIN_PWM_CONTROL);
	263	berlin_pwm_writel(bpc, i, channel->duty, BERLIN_PWM_DUTY);
	264	berlin_pwm_writel(bpc, i, channel->tcnt, BERLIN_PWM_TCNT);
	265	berlin_pwm_writel(bpc, i, channel->enable, BERLIN_PWM_ENABLE);
bbf0722c JZ	266	}
	267
	268	return 0;
	269	}
bbf0722c	270
fac37751 UKK	271	static DEFINE_SIMPLE_DEV_PM_OPS(berlin_pwm_pm_ops, berlin_pwm_suspend,
fac37751 UKK	272	berlin_pwm_resume);
bbf0722c	273
59d5c8b1 AT	274	static struct platform_driver berlin_pwm_driver = {
59d5c8b1 AT	275	.probe = berlin_pwm_probe,
59d5c8b1 AT	276	.driver = {
	277	.name = "berlin-pwm",
	278	.of_match_table = berlin_pwm_match,
fac37751	279	.pm = pm_ptr(&berlin_pwm_pm_ops),
59d5c8b1 AT	280	},
	281	};
	282	module_platform_driver(berlin_pwm_driver);
	283
	284	MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
	285	MODULE_DESCRIPTION("Marvell Berlin PWM driver");
	286	MODULE_LICENSE("GPL v2");