1// SPDX-License-Identifier: GPL-2.0
  2//
  3// Regulator driver for TPS68470 PMIC
  4//
  5// Copyright (c) 2021 Red Hat Inc.
  6// Copyright (C) 2018 Intel Corporation
  7//
  8// Authors:
  9//	Hans de Goede <hdegoede@redhat.com>
 10//	Zaikuo Wang <zaikuo.wang@intel.com>
 11//	Tianshu Qiu <tian.shu.qiu@intel.com>
 12//	Jian Xu Zheng <jian.xu.zheng@intel.com>
 13//	Yuning Pu <yuning.pu@intel.com>
 14//	Rajmohan Mani <rajmohan.mani@intel.com>
 15
 16#include <linux/clk.h>
 17#include <linux/device.h>
 18#include <linux/err.h>
 19#include <linux/init.h>
 20#include <linux/kernel.h>
 21#include <linux/mfd/tps68470.h>
 22#include <linux/module.h>
 23#include <linux/platform_data/tps68470.h>
 24#include <linux/platform_device.h>
 25#include <linux/regulator/driver.h>
 26#include <linux/regulator/machine.h>
 27
 28struct tps68470_regulator_data {
 29	struct clk *clk;
 30};
 31
 32#define TPS68470_REGULATOR(_name, _id, _ops, _n,			\
 33			   _vr, _vm, _er, _em, _lr, _nlr)		\
 34	[TPS68470_ ## _name] = {					\
 35		.name			= # _name,			\
 36		.id			= _id,				\
 37		.ops			= &_ops,			\
 38		.n_voltages		= _n,				\
 39		.type			= REGULATOR_VOLTAGE,		\
 40		.owner			= THIS_MODULE,			\
 41		.vsel_reg		= _vr,				\
 42		.vsel_mask		= _vm,				\
 43		.enable_reg		= _er,				\
 44		.enable_mask		= _em,				\
 45		.linear_ranges		= _lr,				\
 46		.n_linear_ranges	= _nlr,				\
 47	}
 48
 49static const struct linear_range tps68470_ldo_ranges[] = {
 50	REGULATOR_LINEAR_RANGE(875000, 0, 125, 17800),
 51};
 52
 53static const struct linear_range tps68470_core_ranges[] = {
 54	REGULATOR_LINEAR_RANGE(900000, 0, 42, 25000),
 55};
 56
 57static int tps68470_regulator_enable(struct regulator_dev *rdev)
 58{
 59	struct tps68470_regulator_data *data = rdev->reg_data;
 60	int ret;
 61
 62	/* The Core buck regulator needs the PMIC's PLL to be enabled */
 63	if (rdev->desc->id == TPS68470_CORE) {
 64		ret = clk_prepare_enable(data->clk);
 65		if (ret) {
 66			dev_err(&rdev->dev, "Error enabling TPS68470 clock\n");
 67			return ret;
 68		}
 69	}
 70
 71	return regulator_enable_regmap(rdev);
 72}
 73
 74static int tps68470_regulator_disable(struct regulator_dev *rdev)
 75{
 76	struct tps68470_regulator_data *data = rdev->reg_data;
 77
 78	if (rdev->desc->id == TPS68470_CORE)
 79		clk_disable_unprepare(data->clk);
 80
 81	return regulator_disable_regmap(rdev);
 82}
 83
 84/* Operations permitted on DCDCx, LDO2, LDO3 and LDO4 */
 85static const struct regulator_ops tps68470_regulator_ops = {
 86	.is_enabled		= regulator_is_enabled_regmap,
 87	.enable			= tps68470_regulator_enable,
 88	.disable		= tps68470_regulator_disable,
 89	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
 90	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
 91	.list_voltage		= regulator_list_voltage_linear_range,
 92	.map_voltage		= regulator_map_voltage_linear_range,
 93};
 94
 95static const struct regulator_ops tps68470_always_on_reg_ops = {
 96	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
 97	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
 98	.list_voltage		= regulator_list_voltage_linear_range,
 99	.map_voltage		= regulator_map_voltage_linear_range,
100};
101
102static const struct regulator_desc regulators[] = {
103	TPS68470_REGULATOR(CORE, TPS68470_CORE, tps68470_regulator_ops, 43,
104			   TPS68470_REG_VDVAL, TPS68470_VDVAL_DVOLT_MASK,
105			   TPS68470_REG_VDCTL, TPS68470_VDCTL_EN_MASK,
106			   tps68470_core_ranges, ARRAY_SIZE(tps68470_core_ranges)),
107	TPS68470_REGULATOR(ANA, TPS68470_ANA, tps68470_regulator_ops, 126,
108			   TPS68470_REG_VAVAL, TPS68470_VAVAL_AVOLT_MASK,
109			   TPS68470_REG_VACTL, TPS68470_VACTL_EN_MASK,
110			   tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)),
111	TPS68470_REGULATOR(VCM, TPS68470_VCM, tps68470_regulator_ops, 126,
112			   TPS68470_REG_VCMVAL, TPS68470_VCMVAL_VCVOLT_MASK,
113			   TPS68470_REG_VCMCTL, TPS68470_VCMCTL_EN_MASK,
114			   tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)),
115	TPS68470_REGULATOR(VIO, TPS68470_VIO, tps68470_always_on_reg_ops, 126,
116			   TPS68470_REG_VIOVAL, TPS68470_VIOVAL_IOVOLT_MASK,
117			   0, 0,
118			   tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)),
119/*
120 * (1) This regulator must have the same voltage as VIO if S_IO LDO is used to
121 *     power a sensor/VCM which I2C is daisy chained behind the PMIC.
122 * (2) If there is no I2C daisy chain it can be set freely.
123 */
124	TPS68470_REGULATOR(VSIO, TPS68470_VSIO, tps68470_regulator_ops, 126,
125			   TPS68470_REG_VSIOVAL, TPS68470_VSIOVAL_IOVOLT_MASK,
126			   TPS68470_REG_S_I2C_CTL, TPS68470_S_I2C_CTL_EN_MASK,
127			   tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)),
128	TPS68470_REGULATOR(AUX1, TPS68470_AUX1, tps68470_regulator_ops, 126,
129			   TPS68470_REG_VAUX1VAL, TPS68470_VAUX1VAL_AUX1VOLT_MASK,
130			   TPS68470_REG_VAUX1CTL, TPS68470_VAUX1CTL_EN_MASK,
131			   tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)),
132	TPS68470_REGULATOR(AUX2, TPS68470_AUX2, tps68470_regulator_ops, 126,
133			   TPS68470_REG_VAUX2VAL, TPS68470_VAUX2VAL_AUX2VOLT_MASK,
134			   TPS68470_REG_VAUX2CTL, TPS68470_VAUX2CTL_EN_MASK,
135			   tps68470_ldo_ranges, ARRAY_SIZE(tps68470_ldo_ranges)),
136};
137
138static int tps68470_regulator_probe(struct platform_device *pdev)
139{
140	struct device *dev = &pdev->dev;
141	struct tps68470_regulator_platform_data *pdata = dev_get_platdata(dev);
142	struct tps68470_regulator_data *data;
143	struct regulator_config config = { };
144	struct regulator_dev *rdev;
145	int i;
146
147	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
148	if (!data)
149		return -ENOMEM;
150
151	data->clk = devm_clk_get(dev, "tps68470-clk");
152	if (IS_ERR(data->clk))
153		return dev_err_probe(dev, PTR_ERR(data->clk), "getting tps68470-clk\n");
154
155	config.dev = dev->parent;
156	config.regmap = dev_get_drvdata(dev->parent);
157	config.driver_data = data;
158
159	for (i = 0; i < TPS68470_NUM_REGULATORS; i++) {
160		if (pdata)
161			config.init_data = pdata->reg_init_data[i];
162		else
163			config.init_data = NULL;
164
165		rdev = devm_regulator_register(dev, &regulators[i], &config);
166		if (IS_ERR(rdev))
167			return dev_err_probe(dev, PTR_ERR(rdev),
168					     "registering %s regulator\n",
169					     regulators[i].name);
170	}
171
172	return 0;
173}
174
175static struct platform_driver tps68470_regulator_driver = {
176	.driver = {
177		.name = "tps68470-regulator",
178		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
179	},
180	.probe = tps68470_regulator_probe,
181};
182
183/*
184 * The ACPI tps68470 probe-ordering depends on the clk/gpio/regulator drivers
185 * registering before the drivers for the camera-sensors which use them bind.
186 * subsys_initcall() ensures this when the drivers are builtin.
187 */
188static int __init tps68470_regulator_init(void)
189{
190	return platform_driver_register(&tps68470_regulator_driver);
191}
192subsys_initcall(tps68470_regulator_init);
193
194static void __exit tps68470_regulator_exit(void)
195{
196	platform_driver_unregister(&tps68470_regulator_driver);
197}
198module_exit(tps68470_regulator_exit);
199
200MODULE_ALIAS("platform:tps68470-regulator");
201MODULE_DESCRIPTION("TPS68470 voltage regulator driver");
202MODULE_LICENSE("GPL v2");