spacemit-p1.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Driver for regulators found in the SpacemiT P1 PMIC
  4 *
  5 * Copyright (C) 2025 by RISCstar Solutions Corporation.  All rights reserved.
  6 * Derived from code from SpacemiT.
  7 *	Copyright (c) 2023, SPACEMIT Co., Ltd
  8 */
  9
 10#include <linux/array_size.h>
 11#include <linux/bits.h>
 12#include <linux/device.h>
 13#include <linux/linear_range.h>
 14#include <linux/module.h>
 15#include <linux/of.h>
 16#include <linux/platform_device.h>
 17#include <linux/regulator/driver.h>
 18
 19#define MOD_NAME	"spacemit-p1-regulator"
 20
 21enum p1_regulator_id {
 22	P1_BUCK1,
 23	P1_BUCK2,
 24	P1_BUCK3,
 25	P1_BUCK4,
 26	P1_BUCK5,
 27	P1_BUCK6,
 28
 29	P1_ALDO1,
 30	P1_ALDO2,
 31	P1_ALDO3,
 32	P1_ALDO4,
 33
 34	P1_DLDO1,
 35	P1_DLDO2,
 36	P1_DLDO3,
 37	P1_DLDO4,
 38	P1_DLDO5,
 39	P1_DLDO6,
 40	P1_DLDO7,
 41};
 42
 43static const struct regulator_ops p1_regulator_ops = {
 44	.list_voltage		= regulator_list_voltage_linear_range,
 45	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
 46	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
 47	.set_voltage_time_sel   = regulator_set_voltage_time_sel,
 48	.enable			= regulator_enable_regmap,
 49	.disable		= regulator_disable_regmap,
 50	.is_enabled		= regulator_is_enabled_regmap,
 51};
 52
 53/* Selector value 255 can be used to disable the buck converter on sleep */
 54static const struct linear_range p1_buck_ranges[] = {
 55	REGULATOR_LINEAR_RANGE(500000, 0, 170, 5000),
 56	REGULATOR_LINEAR_RANGE(1375000, 171, 254, 25000),
 57};
 58
 59/* Selector value 0 can be used for suspend */
 60static const struct linear_range p1_ldo_ranges[] = {
 61	REGULATOR_LINEAR_RANGE(500000, 11, 127, 25000),
 62};
 63
 64/* These define the voltage selector field for buck and LDO regulators */
 65#define BUCK_MASK		GENMASK(7, 0)
 66#define LDO_MASK		GENMASK(6, 0)
 67
 68#define P1_ID(_TYPE, _n)	P1_ ## _TYPE ## _n
 69#define P1_ENABLE_REG(_off, _n)	((_off) + 3 * ((_n) - 1))
 70
 71#define P1_REG_DESC(_TYPE, _type, _n, _s, _off, _mask, _nv, _ranges)	\
 72	{								\
 73		.name			= #_type #_n,			\
 74		.supply_name		= _s,				\
 75		.of_match		= of_match_ptr(#_type #_n),	\
 76		.regulators_node	= of_match_ptr("regulators"),	\
 77		.id			= P1_ID(_TYPE, _n),		\
 78		.n_voltages		= _nv,				\
 79		.ops			= &p1_regulator_ops,		\
 80		.owner			= THIS_MODULE,			\
 81		.linear_ranges		= _ranges,			\
 82		.n_linear_ranges	= ARRAY_SIZE(_ranges),		\
 83		.vsel_reg		= P1_ENABLE_REG(_off, _n) + 1,	\
 84		.vsel_mask		= _mask,			\
 85		.enable_reg		= P1_ENABLE_REG(_off, _n),	\
 86		.enable_mask		= BIT(0),			\
 87	}
 88
 89#define P1_BUCK_DESC(_n) \
 90	P1_REG_DESC(BUCK, buck, _n, "vin", 0x47, BUCK_MASK, 255, p1_buck_ranges)
 91
 92#define P1_ALDO_DESC(_n) \
 93	P1_REG_DESC(ALDO, aldo, _n, "vin", 0x5b, LDO_MASK, 128, p1_ldo_ranges)
 94
 95#define P1_DLDO_DESC(_n) \
 96	P1_REG_DESC(DLDO, dldo, _n, "buck5", 0x67, LDO_MASK, 128, p1_ldo_ranges)
 97
 98static const struct regulator_desc p1_regulator_desc[] = {
 99	P1_BUCK_DESC(1),
100	P1_BUCK_DESC(2),
101	P1_BUCK_DESC(3),
102	P1_BUCK_DESC(4),
103	P1_BUCK_DESC(5),
104	P1_BUCK_DESC(6),
105
106	P1_ALDO_DESC(1),
107	P1_ALDO_DESC(2),
108	P1_ALDO_DESC(3),
109	P1_ALDO_DESC(4),
110
111	P1_DLDO_DESC(1),
112	P1_DLDO_DESC(2),
113	P1_DLDO_DESC(3),
114	P1_DLDO_DESC(4),
115	P1_DLDO_DESC(5),
116	P1_DLDO_DESC(6),
117	P1_DLDO_DESC(7),
118};
119
120static int p1_regulator_probe(struct platform_device *pdev)
121{
122	struct regulator_config config = { };
123	struct device *dev = &pdev->dev;
124	u32 i;
125
126	/*
127	 * The parent device (PMIC) owns the regmap.  Since we don't
128	 * provide one in the config structure, that one will be used.
129	 */
130	config.dev = dev->parent;
131
132	for (i = 0; i < ARRAY_SIZE(p1_regulator_desc); i++) {
133		const struct regulator_desc *desc = &p1_regulator_desc[i];
134		struct regulator_dev *rdev;
135
136		rdev = devm_regulator_register(dev, desc, &config);
137		if (IS_ERR(rdev))
138			return dev_err_probe(dev, PTR_ERR(rdev),
139					     "error registering regulator %s\n",
140					     desc->name);
141	}
142
143	return 0;
144}
145
146static struct platform_driver p1_regulator_driver = {
147	.probe = p1_regulator_probe,
148	.driver = {
149		.name = MOD_NAME,
150	},
151};
152
153module_platform_driver(p1_regulator_driver);
154
155MODULE_DESCRIPTION("SpacemiT P1 regulator driver");
156MODULE_LICENSE("GPL");
157MODULE_ALIAS("platform:" MOD_NAME);