1 // SPDX-License-Identifier: GPL-2.0
3 // Device driver for regulators in Hisi IC
5 // Copyright (c) 2013 Linaro Ltd.
6 // Copyright (c) 2011 Hisilicon.
7 // Copyright (c) 2020-2021 Huawei Technologies Co., Ltd
9 // Guodong Xu <guodong.xu@linaro.org>
11 #include <linux/delay.h>
12 #include <linux/mfd/hi6421-spmi-pmic.h>
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/regmap.h>
16 #include <linux/regulator/driver.h>
17 #include <linux/spmi.h>
19 struct hi6421_spmi_reg_info {
20 struct regulator_desc desc;
21 struct hi6421_spmi_pmic *pmic;
25 /* Serialize regulator enable logic */
26 struct mutex enable_mutex;
29 static const unsigned int ldo3_voltages[] = {
30 1500000, 1550000, 1600000, 1650000,
31 1700000, 1725000, 1750000, 1775000,
32 1800000, 1825000, 1850000, 1875000,
33 1900000, 1925000, 1950000, 2000000
36 static const unsigned int ldo4_voltages[] = {
37 1725000, 1750000, 1775000, 1800000,
38 1825000, 1850000, 1875000, 1900000
41 static const unsigned int ldo9_voltages[] = {
42 1750000, 1800000, 1825000, 2800000,
43 2850000, 2950000, 3000000, 3300000
46 static const unsigned int ldo15_voltages[] = {
47 1800000, 1850000, 2400000, 2600000,
48 2700000, 2850000, 2950000, 3000000
51 static const unsigned int ldo17_voltages[] = {
52 2500000, 2600000, 2700000, 2800000,
53 3000000, 3100000, 3200000, 3300000
56 static const unsigned int ldo34_voltages[] = {
57 2600000, 2700000, 2800000, 2900000,
58 3000000, 3100000, 3200000, 3300000
62 * HI6421V600_LDO() - specify a LDO power line
63 * @_id: LDO id name string
64 * @vtable: voltage table
65 * @ereg: enable register
67 * @vreg: voltage select register
68 * @odelay: off/on delay time in uS
69 * @etime: enable time in uS
70 * @ecomask: eco mode mask
71 * @ecoamp: eco mode load uppler limit in uA
73 #define HI6421V600_LDO(_id, vtable, ereg, emask, vreg, \
74 odelay, etime, ecomask, ecoamp) \
75 [HI6421V600_##_id] = { \
78 .of_match = of_match_ptr(#_id), \
79 .regulators_node = of_match_ptr("regulators"), \
80 .ops = &hi6421_spmi_ldo_rops, \
81 .type = REGULATOR_VOLTAGE, \
82 .id = HI6421V600_##_id, \
83 .owner = THIS_MODULE, \
84 .volt_table = vtable, \
85 .n_voltages = ARRAY_SIZE(vtable), \
86 .vsel_mask = (1 << (ARRAY_SIZE(vtable) - 1)) - 1, \
89 .enable_mask = emask, \
90 .enable_time = etime, \
91 .ramp_delay = etime, \
92 .off_on_delay = odelay, \
94 .eco_mode_mask = ecomask, \
98 static int hi6421_spmi_regulator_enable(struct regulator_dev *rdev)
100 struct hi6421_spmi_reg_info *sreg = rdev_get_drvdata(rdev);
101 struct hi6421_spmi_pmic *pmic = sreg->pmic;
104 /* cannot enable more than one regulator at one time */
105 mutex_lock(&sreg->enable_mutex);
107 ret = regmap_update_bits(pmic->regmap, rdev->desc->enable_reg,
108 rdev->desc->enable_mask,
109 rdev->desc->enable_mask);
111 /* Avoid powering up multiple devices at the same time */
112 usleep_range(rdev->desc->off_on_delay, rdev->desc->off_on_delay + 60);
114 mutex_unlock(&sreg->enable_mutex);
119 static int hi6421_spmi_regulator_disable(struct regulator_dev *rdev)
121 struct hi6421_spmi_reg_info *sreg = rdev_get_drvdata(rdev);
122 struct hi6421_spmi_pmic *pmic = sreg->pmic;
124 return regmap_update_bits(pmic->regmap, rdev->desc->enable_reg,
125 rdev->desc->enable_mask, 0);
128 static unsigned int hi6421_spmi_regulator_get_mode(struct regulator_dev *rdev)
130 struct hi6421_spmi_reg_info *sreg = rdev_get_drvdata(rdev);
131 struct hi6421_spmi_pmic *pmic = sreg->pmic;
134 regmap_read(pmic->regmap, rdev->desc->enable_reg, ®_val);
136 if (reg_val & sreg->eco_mode_mask)
137 return REGULATOR_MODE_IDLE;
139 return REGULATOR_MODE_NORMAL;
142 static int hi6421_spmi_regulator_set_mode(struct regulator_dev *rdev,
145 struct hi6421_spmi_reg_info *sreg = rdev_get_drvdata(rdev);
146 struct hi6421_spmi_pmic *pmic = sreg->pmic;
150 case REGULATOR_MODE_NORMAL:
153 case REGULATOR_MODE_IDLE:
154 val = sreg->eco_mode_mask << (ffs(sreg->eco_mode_mask) - 1);
160 return regmap_update_bits(pmic->regmap, rdev->desc->enable_reg,
161 sreg->eco_mode_mask, val);
165 hi6421_spmi_regulator_get_optimum_mode(struct regulator_dev *rdev,
166 int input_uV, int output_uV,
169 struct hi6421_spmi_reg_info *sreg = rdev_get_drvdata(rdev);
171 if (!sreg->eco_uA || ((unsigned int)load_uA > sreg->eco_uA))
172 return REGULATOR_MODE_NORMAL;
174 return REGULATOR_MODE_IDLE;
177 static const struct regulator_ops hi6421_spmi_ldo_rops = {
178 .is_enabled = regulator_is_enabled_regmap,
179 .enable = hi6421_spmi_regulator_enable,
180 .disable = hi6421_spmi_regulator_disable,
181 .list_voltage = regulator_list_voltage_table,
182 .map_voltage = regulator_map_voltage_iterate,
183 .get_voltage_sel = regulator_get_voltage_sel_regmap,
184 .set_voltage_sel = regulator_set_voltage_sel_regmap,
185 .get_mode = hi6421_spmi_regulator_get_mode,
186 .set_mode = hi6421_spmi_regulator_set_mode,
187 .get_optimum_mode = hi6421_spmi_regulator_get_optimum_mode,
190 /* HI6421v600 regulators with known registers */
191 enum hi6421_spmi_regulator_id {
202 static struct hi6421_spmi_reg_info regulator_info[] = {
203 HI6421V600_LDO(LDO3, ldo3_voltages,
207 HI6421V600_LDO(LDO4, ldo4_voltages,
211 HI6421V600_LDO(LDO9, ldo9_voltages,
215 HI6421V600_LDO(LDO15, ldo15_voltages,
219 HI6421V600_LDO(LDO16, ldo15_voltages,
223 HI6421V600_LDO(LDO17, ldo17_voltages,
227 HI6421V600_LDO(LDO33, ldo17_voltages,
231 HI6421V600_LDO(LDO34, ldo34_voltages,
237 static int hi6421_spmi_regulator_probe(struct platform_device *pdev)
239 struct device *pmic_dev = pdev->dev.parent;
240 struct regulator_config config = { };
241 struct hi6421_spmi_reg_info *sreg;
242 struct hi6421_spmi_reg_info *info;
243 struct device *dev = &pdev->dev;
244 struct hi6421_spmi_pmic *pmic;
245 struct regulator_dev *rdev;
249 * This driver is meant to be called by hi6421-spmi-core,
250 * which should first set drvdata. If this doesn't happen, hit
251 * a warn on and return.
253 pmic = dev_get_drvdata(pmic_dev);
257 sreg = devm_kzalloc(dev, sizeof(*sreg), GFP_KERNEL);
262 mutex_init(&sreg->enable_mutex);
264 for (i = 0; i < ARRAY_SIZE(regulator_info); i++) {
265 info = ®ulator_info[i];
267 config.dev = pdev->dev.parent;
268 config.driver_data = sreg;
269 config.regmap = pmic->regmap;
271 rdev = devm_regulator_register(dev, &info->desc, &config);
273 dev_err(dev, "failed to register %s\n",
275 return PTR_ERR(rdev);
282 static const struct platform_device_id hi6421_spmi_regulator_table[] = {
283 { .name = "hi6421v600-regulator" },
286 MODULE_DEVICE_TABLE(platform, hi6421_spmi_regulator_table);
288 static struct platform_driver hi6421_spmi_regulator_driver = {
289 .id_table = hi6421_spmi_regulator_table,
291 .name = "hi6421v600-regulator",
293 .probe = hi6421_spmi_regulator_probe,
295 module_platform_driver(hi6421_spmi_regulator_driver);
297 MODULE_DESCRIPTION("Hi6421v600 SPMI regulator driver");
298 MODULE_LICENSE("GPL v2");