[linux-2.6-block.git] / drivers / regulator / bd9571mwv-regulator.c

// SPDX-License-Identifier: GPL-2.0
/*
 * ROHM BD9571MWV-M regulator driver
 *
 * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
 *
 * Based on the TPS65086 driver
 *
 * NOTE: VD09 is missing
 */

#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>

#include <linux/mfd/bd9571mwv.h>

struct bd9571mwv_reg {
	struct bd9571mwv *bd;

	/* DDR Backup Power */
	u8 bkup_mode_cnt_keepon;	/* from "rohm,ddr-backup-power" */
	u8 bkup_mode_cnt_saved;
	bool bkup_mode_enabled;

	/* Power switch type */
	bool rstbmode_level;
	bool rstbmode_pulse;
};

enum bd9571mwv_regulators { VD09, VD18, VD25, VD33, DVFS };

#define BD9571MWV_REG(_name, _of, _id, _ops, _vr, _vm, _nv, _min, _step, _lmin)\
	{							\
		.name			= _name,		\
		.of_match		= of_match_ptr(_of),	\
		.regulators_node	= "regulators",		\
		.id			= _id,			\
		.ops			= &_ops,		\
		.n_voltages		= _nv,			\
		.type			= REGULATOR_VOLTAGE,	\
		.owner			= THIS_MODULE,		\
		.vsel_reg		= _vr,			\
		.vsel_mask		= _vm,			\
		.min_uV			= _min,			\
		.uV_step		= _step,		\
		.linear_min_sel		= _lmin,		\
	}

static int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev)
{
	unsigned int val;
	int ret;

	ret = regmap_read(rdev->regmap, BD9571MWV_AVS_SET_MONI, &val);
	if (ret != 0)
		return ret;

	return val & BD9571MWV_AVS_SET_MONI_MASK;
}

static int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev,
						unsigned int sel)
{
	int ret;

	ret = bd9571mwv_avs_get_moni_state(rdev);
	if (ret < 0)
		return ret;

	return regmap_write_bits(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret),
				 rdev->desc->vsel_mask, sel);
}

static int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev)
{
	unsigned int val;
	int ret;

	ret = bd9571mwv_avs_get_moni_state(rdev);
	if (ret < 0)
		return ret;

	ret = regmap_read(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret), &val);
	if (ret != 0)
		return ret;

	val &= rdev->desc->vsel_mask;
	val >>= ffs(rdev->desc->vsel_mask) - 1;

	return val;
}

static int bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev *rdev,
						unsigned int sel)
{
	return regmap_write_bits(rdev->regmap, BD9571MWV_DVFS_SETVID,
				 rdev->desc->vsel_mask, sel);
}

/* Operations permitted on AVS voltage regulator */
static const struct regulator_ops avs_ops = {
	.set_voltage_sel	= bd9571mwv_avs_set_voltage_sel_regmap,
	.map_voltage		= regulator_map_voltage_linear,
	.get_voltage_sel	= bd9571mwv_avs_get_voltage_sel_regmap,
	.list_voltage		= regulator_list_voltage_linear,
};

/* Operations permitted on voltage regulators */
static const struct regulator_ops reg_ops = {
	.set_voltage_sel	= bd9571mwv_reg_set_voltage_sel_regmap,
	.map_voltage		= regulator_map_voltage_linear,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.list_voltage		= regulator_list_voltage_linear,
};

/* Operations permitted on voltage monitors */
static const struct regulator_ops vid_ops = {
	.map_voltage		= regulator_map_voltage_linear,
	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
	.list_voltage		= regulator_list_voltage_linear,
};

static const struct regulator_desc regulators[] = {
	BD9571MWV_REG("VD09", "vd09", VD09, avs_ops, 0, 0x7f,
		      0x80, 600000, 10000, 0x3c),
	BD9571MWV_REG("VD18", "vd18", VD18, vid_ops, BD9571MWV_VD18_VID, 0xf,
		      16, 1625000, 25000, 0),
	BD9571MWV_REG("VD25", "vd25", VD25, vid_ops, BD9571MWV_VD25_VID, 0xf,
		      16, 2150000, 50000, 0),
	BD9571MWV_REG("VD33", "vd33", VD33, vid_ops, BD9571MWV_VD33_VID, 0xf,
		      11, 2800000, 100000, 0),
	BD9571MWV_REG("DVFS", "dvfs", DVFS, reg_ops,
		      BD9571MWV_DVFS_MONIVDAC, 0x7f,
		      0x80, 600000, 10000, 0x3c),
};

#ifdef CONFIG_PM_SLEEP
static int bd9571mwv_bkup_mode_read(struct bd9571mwv *bd, unsigned int *mode)
{
	int ret;

	ret = regmap_read(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
	if (ret) {
		dev_err(bd->dev, "failed to read backup mode (%d)\n", ret);
		return ret;
	}

	return 0;
}

static int bd9571mwv_bkup_mode_write(struct bd9571mwv *bd, unsigned int mode)
{
	int ret;

	ret = regmap_write(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
	if (ret) {
		dev_err(bd->dev, "failed to configure backup mode 0x%x (%d)\n",
			mode, ret);
		return ret;
	}

	return 0;
}

static ssize_t backup_mode_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);

	return sprintf(buf, "%s\n", bdreg->bkup_mode_enabled ? "on" : "off");
}

static ssize_t backup_mode_store(struct device *dev,
				 struct device_attribute *attr,
				 const char *buf, size_t count)
{
	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
	unsigned int mode;
	int ret;

	if (!count)
		return 0;

	ret = kstrtobool(buf, &bdreg->bkup_mode_enabled);
	if (ret)
		return ret;

	if (!bdreg->rstbmode_level)
		return count;

	/*
	 * Configure DDR Backup Mode, to change the role of the accessory power
	 * switch from a power switch to a wake-up switch, or vice versa
	 */
	ret = bd9571mwv_bkup_mode_read(bdreg->bd, &mode);
	if (ret)
		return ret;

	mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
	if (bdreg->bkup_mode_enabled)
		mode |= bdreg->bkup_mode_cnt_keepon;

	ret = bd9571mwv_bkup_mode_write(bdreg->bd, mode);
	if (ret)
		return ret;

	return count;
}

static DEVICE_ATTR_RW(backup_mode);

static int bd9571mwv_suspend(struct device *dev)
{
	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
	unsigned int mode;
	int ret;

	if (!bdreg->bkup_mode_enabled)
		return 0;

	/* Save DDR Backup Mode */
	ret = bd9571mwv_bkup_mode_read(bdreg->bd, &mode);
	if (ret)
		return ret;

	bdreg->bkup_mode_cnt_saved = mode;

	if (!bdreg->rstbmode_pulse)
		return 0;

	/* Enable DDR Backup Mode */
	mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
	mode |= bdreg->bkup_mode_cnt_keepon;

	if (mode != bdreg->bkup_mode_cnt_saved)
		return bd9571mwv_bkup_mode_write(bdreg->bd, mode);

	return 0;
}

static int bd9571mwv_resume(struct device *dev)
{
	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);

	if (!bdreg->bkup_mode_enabled)
		return 0;

	/* Restore DDR Backup Mode */
	return bd9571mwv_bkup_mode_write(bdreg->bd, bdreg->bkup_mode_cnt_saved);
}

static const struct dev_pm_ops bd9571mwv_pm  = {
	SET_SYSTEM_SLEEP_PM_OPS(bd9571mwv_suspend, bd9571mwv_resume)
};

static int bd9571mwv_regulator_remove(struct platform_device *pdev)
{
	device_remove_file(&pdev->dev, &dev_attr_backup_mode);
	return 0;
}
#define DEV_PM_OPS	&bd9571mwv_pm
#else
#define DEV_PM_OPS	NULL
#define bd9571mwv_regulator_remove	NULL
#endif /* CONFIG_PM_SLEEP */

static int bd9571mwv_regulator_probe(struct platform_device *pdev)
{
	struct bd9571mwv *bd = dev_get_drvdata(pdev->dev.parent);
	struct regulator_config config = { };
	struct bd9571mwv_reg *bdreg;
	struct regulator_dev *rdev;
	unsigned int val;
	int i;

	bdreg = devm_kzalloc(&pdev->dev, sizeof(*bdreg), GFP_KERNEL);
	if (!bdreg)
		return -ENOMEM;

	bdreg->bd = bd;

	platform_set_drvdata(pdev, bdreg);

	config.dev = &pdev->dev;
	config.dev->of_node = bd->dev->of_node;
	config.driver_data = bd;
	config.regmap = bd->regmap;

	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
		rdev = devm_regulator_register(&pdev->dev, &regulators[i],
					       &config);
		if (IS_ERR(rdev)) {
			dev_err(bd->dev, "failed to register %s regulator\n",
				pdev->name);
			return PTR_ERR(rdev);
		}
	}

	val = 0;
	of_property_read_u32(bd->dev->of_node, "rohm,ddr-backup-power", &val);
	if (val & ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK) {
		dev_err(bd->dev, "invalid %s mode %u\n",
			"rohm,ddr-backup-power", val);
		return -EINVAL;
	}
	bdreg->bkup_mode_cnt_keepon = val;

	bdreg->rstbmode_level = of_property_read_bool(bd->dev->of_node,
						      "rohm,rstbmode-level");
	bdreg->rstbmode_pulse = of_property_read_bool(bd->dev->of_node,
						      "rohm,rstbmode-pulse");
	if (bdreg->rstbmode_level && bdreg->rstbmode_pulse) {
		dev_err(bd->dev, "only one rohm,rstbmode-* may be specified");
		return -EINVAL;
	}

#ifdef CONFIG_PM_SLEEP
	if (bdreg->bkup_mode_cnt_keepon) {
		int ret;

		/*
		 * Backup mode is enabled by default in pulse mode, but needs
		 * explicit user setup in level mode.
		 */
		bdreg->bkup_mode_enabled = bdreg->rstbmode_pulse;

		ret = device_create_file(&pdev->dev, &dev_attr_backup_mode);
		if (ret)
			return ret;
	}
#endif /* CONFIG_PM_SLEEP */

	return 0;
}

static const struct platform_device_id bd9571mwv_regulator_id_table[] = {
	{ "bd9571mwv-regulator", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, bd9571mwv_regulator_id_table);

static struct platform_driver bd9571mwv_regulator_driver = {
	.driver = {
		.name = "bd9571mwv-regulator",
		.pm = DEV_PM_OPS,
	},
	.probe = bd9571mwv_regulator_probe,
	.remove = bd9571mwv_regulator_remove,
	.id_table = bd9571mwv_regulator_id_table,
};
module_platform_driver(bd9571mwv_regulator_driver);

MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
MODULE_DESCRIPTION("BD9571MWV Regulator driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
49f53951	1	// SPDX-License-Identifier: GPL-2.0
e85c5a15 MV	2	/*
	3	* ROHM BD9571MWV-M regulator driver
	4	*
	5	* Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
	6	*
e85c5a15 MV	7	* Based on the TPS65086 driver
	8	*
	9	* NOTE: VD09 is missing
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/of.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/regulator/driver.h>
	16
	17	#include <linux/mfd/bd9571mwv.h>
	18
6eb0bfae GU	19	struct bd9571mwv_reg {
	20	struct bd9571mwv *bd;
	21
	22	/* DDR Backup Power */
	23	u8 bkup_mode_cnt_keepon; /* from "rohm,ddr-backup-power" */
	24	u8 bkup_mode_cnt_saved;
02b3a073	25	bool bkup_mode_enabled;
6eb0bfae GU	26
	27	/* Power switch type */
	28	bool rstbmode_level;
	29	bool rstbmode_pulse;
	30	};
	31
e85c5a15 MV	32	enum bd9571mwv_regulators { VD09, VD18, VD25, VD33, DVFS };
	33
	34	#define BD9571MWV_REG(_name, _of, _id, _ops, _vr, _vm, _nv, _min, _step, _lmin)\
	35	{ \
	36	.name = _name, \
	37	.of_match = of_match_ptr(_of), \
	38	.regulators_node = "regulators", \
	39	.id = _id, \
	40	.ops = &_ops, \
	41	.n_voltages = _nv, \
	42	.type = REGULATOR_VOLTAGE, \
	43	.owner = THIS_MODULE, \
	44	.vsel_reg = _vr, \
	45	.vsel_mask = _vm, \
	46	.min_uV = _min, \
	47	.uV_step = _step, \
	48	.linear_min_sel = _lmin, \
	49	}
	50
cb42b648	51	static int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev)
e85c5a15 MV	52	{
	53	unsigned int val;
	54	int ret;
	55
	56	ret = regmap_read(rdev->regmap, BD9571MWV_AVS_SET_MONI, &val);
	57	if (ret != 0)
	58	return ret;
	59
	60	return val & BD9571MWV_AVS_SET_MONI_MASK;
	61	}
	62
cb42b648 AL	63	static int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev,
cb42b648 AL	64	unsigned int sel)
e85c5a15 MV	65	{
	66	int ret;
	67
	68	ret = bd9571mwv_avs_get_moni_state(rdev);
	69	if (ret < 0)
	70	return ret;
	71
	72	return regmap_write_bits(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret),
	73	rdev->desc->vsel_mask, sel);
	74	}
	75
cb42b648	76	static int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev)
e85c5a15 MV	77	{
	78	unsigned int val;
	79	int ret;
	80
	81	ret = bd9571mwv_avs_get_moni_state(rdev);
	82	if (ret < 0)
	83	return ret;
	84
	85	ret = regmap_read(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret), &val);
	86	if (ret != 0)
	87	return ret;
	88
	89	val &= rdev->desc->vsel_mask;
	90	val >>= ffs(rdev->desc->vsel_mask) - 1;
	91
	92	return val;
	93	}
	94
cb42b648 AL	95	static int bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev *rdev,
cb42b648 AL	96	unsigned int sel)
e85c5a15 MV	97	{
	98	return regmap_write_bits(rdev->regmap, BD9571MWV_DVFS_SETVID,
	99	rdev->desc->vsel_mask, sel);
	100	}
	101
	102	/* Operations permitted on AVS voltage regulator */
e109e711	103	static const struct regulator_ops avs_ops = {
e85c5a15 MV	104	.set_voltage_sel = bd9571mwv_avs_set_voltage_sel_regmap,
	105	.map_voltage = regulator_map_voltage_linear,
	106	.get_voltage_sel = bd9571mwv_avs_get_voltage_sel_regmap,
	107	.list_voltage = regulator_list_voltage_linear,
	108	};
	109
	110	/* Operations permitted on voltage regulators */
e109e711	111	static const struct regulator_ops reg_ops = {
e85c5a15 MV	112	.set_voltage_sel = bd9571mwv_reg_set_voltage_sel_regmap,
	113	.map_voltage = regulator_map_voltage_linear,
	114	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	115	.list_voltage = regulator_list_voltage_linear,
	116	};
	117
	118	/* Operations permitted on voltage monitors */
e109e711	119	static const struct regulator_ops vid_ops = {
e85c5a15 MV	120	.map_voltage = regulator_map_voltage_linear,
	121	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	122	.list_voltage = regulator_list_voltage_linear,
	123	};
	124
e109e711	125	static const struct regulator_desc regulators[] = {
e85c5a15 MV	126	BD9571MWV_REG("VD09", "vd09", VD09, avs_ops, 0, 0x7f,
	127	0x80, 600000, 10000, 0x3c),
	128	BD9571MWV_REG("VD18", "vd18", VD18, vid_ops, BD9571MWV_VD18_VID, 0xf,
	129	16, 1625000, 25000, 0),
	130	BD9571MWV_REG("VD25", "vd25", VD25, vid_ops, BD9571MWV_VD25_VID, 0xf,
	131	16, 2150000, 50000, 0),
	132	BD9571MWV_REG("VD33", "vd33", VD33, vid_ops, BD9571MWV_VD33_VID, 0xf,
	133	11, 2800000, 100000, 0),
	134	BD9571MWV_REG("DVFS", "dvfs", DVFS, reg_ops,
	135	BD9571MWV_DVFS_MONIVDAC, 0x7f,
	136	0x80, 600000, 10000, 0x3c),
	137	};
	138
6eb0bfae GU	139	#ifdef CONFIG_PM_SLEEP
	140	static int bd9571mwv_bkup_mode_read(struct bd9571mwv bd, unsigned int mode)
	141	{
	142	int ret;
	143
	144	ret = regmap_read(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
	145	if (ret) {
	146	dev_err(bd->dev, "failed to read backup mode (%d)\n", ret);
	147	return ret;
	148	}
	149
	150	return 0;
	151	}
	152
	153	static int bd9571mwv_bkup_mode_write(struct bd9571mwv *bd, unsigned int mode)
	154	{
	155	int ret;
	156
	157	ret = regmap_write(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
	158	if (ret) {
	159	dev_err(bd->dev, "failed to configure backup mode 0x%x (%d)\n",
	160	mode, ret);
	161	return ret;
	162	}
	163
	164	return 0;
	165	}
	166
02b3a073 GU	167	static ssize_t backup_mode_show(struct device *dev,
	168	struct device_attribute attr, char buf)
	169	{
	170	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
	171
	172	return sprintf(buf, "%s\n", bdreg->bkup_mode_enabled ? "on" : "off");
	173	}
	174
	175	static ssize_t backup_mode_store(struct device *dev,
	176	struct device_attribute *attr,
	177	const char *buf, size_t count)
	178	{
	179	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
e436875f	180	unsigned int mode;
02b3a073 GU	181	int ret;
	182
	183	if (!count)
	184	return 0;
	185
	186	ret = kstrtobool(buf, &bdreg->bkup_mode_enabled);
	187	if (ret)
	188	return ret;
	189
e436875f GU	190	if (!bdreg->rstbmode_level)
	191	return count;
	192
	193	/*
	194	* Configure DDR Backup Mode, to change the role of the accessory power
	195	* switch from a power switch to a wake-up switch, or vice versa
	196	*/
	197	ret = bd9571mwv_bkup_mode_read(bdreg->bd, &mode);
	198	if (ret)
	199	return ret;
	200
	201	mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
	202	if (bdreg->bkup_mode_enabled)
	203	mode \|= bdreg->bkup_mode_cnt_keepon;
	204
	205	ret = bd9571mwv_bkup_mode_write(bdreg->bd, mode);
	206	if (ret)
	207	return ret;
	208
02b3a073 GU	209	return count;
	210	}
	211
a70a4694	212	static DEVICE_ATTR_RW(backup_mode);
02b3a073	213
6eb0bfae GU	214	static int bd9571mwv_suspend(struct device *dev)
	215	{
	216	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
	217	unsigned int mode;
	218	int ret;
	219
02b3a073	220	if (!bdreg->bkup_mode_enabled)
6eb0bfae GU	221	return 0;
	222
	223	/* Save DDR Backup Mode */
	224	ret = bd9571mwv_bkup_mode_read(bdreg->bd, &mode);
	225	if (ret)
	226	return ret;
	227
	228	bdreg->bkup_mode_cnt_saved = mode;
	229
	230	if (!bdreg->rstbmode_pulse)
	231	return 0;
	232
	233	/* Enable DDR Backup Mode */
	234	mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
	235	mode \|= bdreg->bkup_mode_cnt_keepon;
	236
	237	if (mode != bdreg->bkup_mode_cnt_saved)
	238	return bd9571mwv_bkup_mode_write(bdreg->bd, mode);
	239
	240	return 0;
	241	}
	242
	243	static int bd9571mwv_resume(struct device *dev)
	244	{
	245	struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
	246
02b3a073	247	if (!bdreg->bkup_mode_enabled)
6eb0bfae GU	248	return 0;
	249
	250	/* Restore DDR Backup Mode */
	251	return bd9571mwv_bkup_mode_write(bdreg->bd, bdreg->bkup_mode_cnt_saved);
	252	}
	253
	254	static const struct dev_pm_ops bd9571mwv_pm = {
	255	SET_SYSTEM_SLEEP_PM_OPS(bd9571mwv_suspend, bd9571mwv_resume)
	256	};
	257
02b3a073 GU	258	static int bd9571mwv_regulator_remove(struct platform_device *pdev)
	259	{
	260	device_remove_file(&pdev->dev, &dev_attr_backup_mode);
	261	return 0;
	262	}
6eb0bfae GU	263	#define DEV_PM_OPS &bd9571mwv_pm
	264	#else
	265	#define DEV_PM_OPS NULL
02b3a073	266	#define bd9571mwv_regulator_remove NULL
6eb0bfae GU	267	#endif /* CONFIG_PM_SLEEP */
6eb0bfae GU	268
e85c5a15 MV	269	static int bd9571mwv_regulator_probe(struct platform_device *pdev)
	270	{
	271	struct bd9571mwv *bd = dev_get_drvdata(pdev->dev.parent);
	272	struct regulator_config config = { };
6eb0bfae	273	struct bd9571mwv_reg *bdreg;
e85c5a15	274	struct regulator_dev *rdev;
6eb0bfae	275	unsigned int val;
e85c5a15 MV	276	int i;
e85c5a15 MV	277
6eb0bfae GU	278	bdreg = devm_kzalloc(&pdev->dev, sizeof(*bdreg), GFP_KERNEL);
	279	if (!bdreg)
	280	return -ENOMEM;
	281
	282	bdreg->bd = bd;
	283
	284	platform_set_drvdata(pdev, bdreg);
e85c5a15 MV	285
	286	config.dev = &pdev->dev;
	287	config.dev->of_node = bd->dev->of_node;
	288	config.driver_data = bd;
	289	config.regmap = bd->regmap;
	290
	291	for (i = 0; i < ARRAY_SIZE(regulators); i++) {
	292	rdev = devm_regulator_register(&pdev->dev, &regulators[i],
	293	&config);
	294	if (IS_ERR(rdev)) {
	295	dev_err(bd->dev, "failed to register %s regulator\n",
	296	pdev->name);
	297	return PTR_ERR(rdev);
	298	}
	299	}
	300
6eb0bfae GU	301	val = 0;
	302	of_property_read_u32(bd->dev->of_node, "rohm,ddr-backup-power", &val);
	303	if (val & ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK) {
	304	dev_err(bd->dev, "invalid %s mode %u\n",
	305	"rohm,ddr-backup-power", val);
	306	return -EINVAL;
	307	}
	308	bdreg->bkup_mode_cnt_keepon = val;
	309
	310	bdreg->rstbmode_level = of_property_read_bool(bd->dev->of_node,
	311	"rohm,rstbmode-level");
	312	bdreg->rstbmode_pulse = of_property_read_bool(bd->dev->of_node,
	313	"rohm,rstbmode-pulse");
	314	if (bdreg->rstbmode_level && bdreg->rstbmode_pulse) {
	315	dev_err(bd->dev, "only one rohm,rstbmode-* may be specified");
	316	return -EINVAL;
	317	}
	318
02b3a073	319	#ifdef CONFIG_PM_SLEEP
6eb0bfae	320	if (bdreg->bkup_mode_cnt_keepon) {
02b3a073 GU	321	int ret;
02b3a073 GU	322
6eb0bfae	323	/*
02b3a073	324	* Backup mode is enabled by default in pulse mode, but needs
6eb0bfae GU	325	* explicit user setup in level mode.
6eb0bfae GU	326	*/
02b3a073 GU	327	bdreg->bkup_mode_enabled = bdreg->rstbmode_pulse;
	328
	329	ret = device_create_file(&pdev->dev, &dev_attr_backup_mode);
	330	if (ret)
	331	return ret;
6eb0bfae	332	}
02b3a073	333	#endif /* CONFIG_PM_SLEEP */
6eb0bfae	334
e85c5a15 MV	335	return 0;
	336	}
	337
	338	static const struct platform_device_id bd9571mwv_regulator_id_table[] = {
	339	{ "bd9571mwv-regulator", },
	340	{ /* sentinel */ }
	341	};
	342	MODULE_DEVICE_TABLE(platform, bd9571mwv_regulator_id_table);
	343
	344	static struct platform_driver bd9571mwv_regulator_driver = {
	345	.driver = {
	346	.name = "bd9571mwv-regulator",
6eb0bfae	347	.pm = DEV_PM_OPS,
e85c5a15 MV	348	},
e85c5a15 MV	349	.probe = bd9571mwv_regulator_probe,
02b3a073	350	.remove = bd9571mwv_regulator_remove,
e85c5a15 MV	351	.id_table = bd9571mwv_regulator_id_table,
	352	};
	353	module_platform_driver(bd9571mwv_regulator_driver);
	354
	355	MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
	356	MODULE_DESCRIPTION("BD9571MWV Regulator driver");
	357	MODULE_LICENSE("GPL v2");