1// SPDX-License-Identifier: GPL-2.0+
2//
3// arizona-ldo1.c  --  LDO1 supply for Arizona devices
4//
5// Copyright 2012 Wolfson Microelectronics PLC.
6//
7// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8
9#include <linux/module.h>
10#include <linux/moduleparam.h>
11#include <linux/init.h>
12#include <linux/bitops.h>
13#include <linux/err.h>
14#include <linux/of.h>
15#include <linux/gpio/consumer.h>
16#include <linux/platform_device.h>
17#include <linux/regulator/driver.h>
18#include <linux/regulator/machine.h>
19#include <linux/regulator/of_regulator.h>
20#include <linux/slab.h>
21
22#include <linux/regulator/arizona-ldo1.h>
23
24#include <linux/mfd/arizona/core.h>
25#include <linux/mfd/arizona/pdata.h>
26#include <linux/mfd/arizona/registers.h>
27
28#include <linux/mfd/madera/core.h>
29#include <linux/mfd/madera/pdata.h>
30#include <linux/mfd/madera/registers.h>
31
32struct arizona_ldo1 {
33	struct regulator_dev *regulator;
34	struct regmap *regmap;
35
36	struct regulator_consumer_supply supply;
37	struct regulator_init_data init_data;
38
39	struct gpio_desc *ena_gpiod;
40};
41
42static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
43					   unsigned sel)
44{
45	struct regmap *regmap = rdev_get_regmap(rdev);
46	unsigned int val;
47	int ret;
48
49	if (sel == rdev->desc->n_voltages - 1)
50		val = ARIZONA_LDO1_HI_PWR;
51	else
52		val = 0;
53
54	ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
55				 ARIZONA_LDO1_HI_PWR, val);
56	if (ret != 0)
57		return ret;
58
59	if (val)
60		return 0;
61
62	return regulator_set_voltage_sel_regmap(rdev, sel);
63}
64
65static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
66{
67	struct regmap *regmap = rdev_get_regmap(rdev);
68	unsigned int val;
69	int ret;
70
71	ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
72	if (ret != 0)
73		return ret;
74
75	if (val & ARIZONA_LDO1_HI_PWR)
76		return rdev->desc->n_voltages - 1;
77
78	return regulator_get_voltage_sel_regmap(rdev);
79}
80
81static const struct regulator_ops arizona_ldo1_hc_ops = {
82	.list_voltage = regulator_list_voltage_linear_range,
83	.map_voltage = regulator_map_voltage_linear_range,
84	.get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
85	.set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
86	.get_bypass = regulator_get_bypass_regmap,
87	.set_bypass = regulator_set_bypass_regmap,
88};
89
90static const struct linear_range arizona_ldo1_hc_ranges[] = {
91	REGULATOR_LINEAR_RANGE(900000, 0, 0x6, 50000),
92	REGULATOR_LINEAR_RANGE(1800000, 0x7, 0x7, 0),
93};
94
95static const struct regulator_desc arizona_ldo1_hc = {
96	.name = "LDO1",
97	.supply_name = "LDOVDD",
98	.type = REGULATOR_VOLTAGE,
99	.ops = &arizona_ldo1_hc_ops,
100
101	.vsel_reg = ARIZONA_LDO1_CONTROL_1,
102	.vsel_mask = ARIZONA_LDO1_VSEL_MASK,
103	.bypass_reg = ARIZONA_LDO1_CONTROL_1,
104	.bypass_mask = ARIZONA_LDO1_BYPASS,
105	.linear_ranges = arizona_ldo1_hc_ranges,
106	.n_linear_ranges = ARRAY_SIZE(arizona_ldo1_hc_ranges),
107	.n_voltages = 8,
108	.enable_time = 1500,
109	.ramp_delay = 24000,
110
111	.owner = THIS_MODULE,
112};
113
114static const struct regulator_ops arizona_ldo1_ops = {
115	.list_voltage = regulator_list_voltage_linear,
116	.map_voltage = regulator_map_voltage_linear,
117	.get_voltage_sel = regulator_get_voltage_sel_regmap,
118	.set_voltage_sel = regulator_set_voltage_sel_regmap,
119};
120
121static const struct regulator_desc arizona_ldo1 = {
122	.name = "LDO1",
123	.supply_name = "LDOVDD",
124	.type = REGULATOR_VOLTAGE,
125	.ops = &arizona_ldo1_ops,
126
127	.vsel_reg = ARIZONA_LDO1_CONTROL_1,
128	.vsel_mask = ARIZONA_LDO1_VSEL_MASK,
129	.min_uV = 900000,
130	.uV_step = 25000,
131	.n_voltages = 13,
132	.enable_time = 500,
133	.ramp_delay = 24000,
134
135	.owner = THIS_MODULE,
136};
137
138static const struct regulator_init_data arizona_ldo1_dvfs = {
139	.constraints = {
140		.min_uV = 1200000,
141		.max_uV = 1800000,
142		.valid_ops_mask = REGULATOR_CHANGE_STATUS |
143				  REGULATOR_CHANGE_VOLTAGE,
144	},
145	.num_consumer_supplies = 1,
146};
147
148static const struct regulator_init_data arizona_ldo1_default = {
149	.constraints = {
150		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
151	},
152	.num_consumer_supplies = 1,
153};
154
155static const struct regulator_init_data arizona_ldo1_wm5110 = {
156	.constraints = {
157		.min_uV = 1175000,
158		.max_uV = 1200000,
159		.valid_ops_mask = REGULATOR_CHANGE_STATUS |
160				  REGULATOR_CHANGE_VOLTAGE,
161	},
162	.num_consumer_supplies = 1,
163};
164
165static const struct regulator_desc madera_ldo1 = {
166	.name = "LDO1",
167	.supply_name = "LDOVDD",
168	.type = REGULATOR_VOLTAGE,
169	.ops = &arizona_ldo1_ops,
170
171	.vsel_reg = MADERA_LDO1_CONTROL_1,
172	.vsel_mask = MADERA_LDO1_VSEL_MASK,
173	.min_uV = 900000,
174	.uV_step = 25000,
175	.n_voltages = 13,
176	.enable_time = 3000,
177
178	.owner = THIS_MODULE,
179};
180
181static const struct regulator_init_data madera_ldo1_default = {
182	.constraints = {
183		.min_uV = 1200000,
184		.max_uV = 1200000,
185		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
186	},
187	.num_consumer_supplies = 1,
188};
189
190static int arizona_ldo1_of_get_pdata(struct arizona_ldo1_pdata *pdata,
191				     struct regulator_config *config,
192				     const struct regulator_desc *desc,
193				     bool *external_dcvdd)
194{
195	struct arizona_ldo1 *ldo1 = config->driver_data;
196	struct device_node *np = config->dev->of_node;
197	struct device_node *init_node, *dcvdd_node;
198	struct regulator_init_data *init_data;
199
200	init_node = of_get_child_by_name(np, "ldo1");
201	dcvdd_node = of_parse_phandle(np, "DCVDD-supply", 0);
202
203	if (init_node) {
204		config->of_node = init_node;
205
206		init_data = of_get_regulator_init_data(config->dev, init_node,
207						       desc);
208		if (init_data) {
209			init_data->consumer_supplies = &ldo1->supply;
210			init_data->num_consumer_supplies = 1;
211
212			if (dcvdd_node && dcvdd_node != init_node)
213				*external_dcvdd = true;
214
215			pdata->init_data = init_data;
216		}
217	} else if (dcvdd_node) {
218		*external_dcvdd = true;
219	}
220
221	of_node_put(dcvdd_node);
222
223	return 0;
224}
225
226static int arizona_ldo1_common_init(struct platform_device *pdev,
227				    struct arizona_ldo1 *ldo1,
228				    const struct regulator_desc *desc,
229				    struct arizona_ldo1_pdata *pdata,
230				    bool *external_dcvdd)
231{
232	struct device *parent_dev = pdev->dev.parent;
233	struct regulator_config config = { };
234	int ret;
235
236	*external_dcvdd = false;
237
238	ldo1->supply.supply = "DCVDD";
239	ldo1->init_data.consumer_supplies = &ldo1->supply;
240	ldo1->supply.dev_name = dev_name(parent_dev);
241
242	config.dev = parent_dev;
243	config.driver_data = ldo1;
244	config.regmap = ldo1->regmap;
245
246	if (IS_ENABLED(CONFIG_OF)) {
247		if (!dev_get_platdata(parent_dev)) {
248			ret = arizona_ldo1_of_get_pdata(pdata,
249							&config, desc,
250							external_dcvdd);
251			if (ret < 0)
252				return ret;
253		}
254	}
255
256	/* We assume that high output = regulator off
257	 * Don't use devm, since we need to get against the parent device
258	 * so clean up would happen at the wrong time
259	 */
260	config.ena_gpiod = gpiod_get_optional(parent_dev, "wlf,ldoena",
261				GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
262	if (IS_ERR(config.ena_gpiod))
263		return PTR_ERR(config.ena_gpiod);
264
265	ldo1->ena_gpiod = config.ena_gpiod;
266
267	if (pdata->init_data)
268		config.init_data = pdata->init_data;
269	else
270		config.init_data = &ldo1->init_data;
271
272	/*
273	 * LDO1 can only be used to supply DCVDD so if it has no
274	 * consumers then DCVDD is supplied externally.
275	 */
276	if (config.init_data->num_consumer_supplies == 0)
277		*external_dcvdd = true;
278
279	ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
280
281	of_node_put(config.of_node);
282
283	if (IS_ERR(ldo1->regulator)) {
284		ret = PTR_ERR(ldo1->regulator);
285		dev_err(&pdev->dev, "Failed to register LDO1 supply: %d\n",
286			ret);
287		return ret;
288	}
289
290	platform_set_drvdata(pdev, ldo1);
291
292	return 0;
293}
294
295static int arizona_ldo1_probe(struct platform_device *pdev)
296{
297	struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
298	struct arizona_ldo1 *ldo1;
299	const struct regulator_desc *desc;
300	bool external_dcvdd;
301	int ret;
302
303	ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
304	if (!ldo1)
305		return -ENOMEM;
306
307	ldo1->regmap = arizona->regmap;
308
309	/*
310	 * Since the chip usually supplies itself we provide some
311	 * default init_data for it.  This will be overridden with
312	 * platform data if provided.
313	 */
314	switch (arizona->type) {
315	case WM5102:
316	case WM8997:
317	case WM8998:
318	case WM1814:
319		desc = &arizona_ldo1_hc;
320		ldo1->init_data = arizona_ldo1_dvfs;
321		break;
322	case WM5110:
323	case WM8280:
324		desc = &arizona_ldo1;
325		ldo1->init_data = arizona_ldo1_wm5110;
326		break;
327	default:
328		desc = &arizona_ldo1;
329		ldo1->init_data = arizona_ldo1_default;
330		break;
331	}
332
333	ret = arizona_ldo1_common_init(pdev, ldo1, desc,
334				       &arizona->pdata.ldo1,
335				       &external_dcvdd);
336	if (ret == 0)
337		arizona->external_dcvdd = external_dcvdd;
338
339	return ret;
340}
341
342static void arizona_ldo1_remove(struct platform_device *pdev)
343{
344	struct arizona_ldo1 *ldo1 = platform_get_drvdata(pdev);
345
346	if (ldo1->ena_gpiod)
347		gpiod_put(ldo1->ena_gpiod);
348}
349
350static int madera_ldo1_probe(struct platform_device *pdev)
351{
352	struct madera *madera = dev_get_drvdata(pdev->dev.parent);
353	struct arizona_ldo1 *ldo1;
354	bool external_dcvdd;
355	int ret;
356
357	ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
358	if (!ldo1)
359		return -ENOMEM;
360
361	ldo1->regmap = madera->regmap;
362
363	ldo1->init_data = madera_ldo1_default;
364
365	ret = arizona_ldo1_common_init(pdev, ldo1, &madera_ldo1,
366				       &madera->pdata.ldo1,
367				       &external_dcvdd);
368	if (ret)
369		return ret;
370
371	madera->internal_dcvdd = !external_dcvdd;
372
373	return 0;
374}
375
376static struct platform_driver arizona_ldo1_driver = {
377	.probe = arizona_ldo1_probe,
378	.remove_new = arizona_ldo1_remove,
379	.driver		= {
380		.name	= "arizona-ldo1",
381		.probe_type = PROBE_FORCE_SYNCHRONOUS,
382	},
383};
384
385static struct platform_driver madera_ldo1_driver = {
386	.probe = madera_ldo1_probe,
387	.remove_new = arizona_ldo1_remove,
388	.driver		= {
389		.name	= "madera-ldo1",
390		.probe_type = PROBE_FORCE_SYNCHRONOUS,
391	},
392};
393
394static struct platform_driver * const madera_ldo1_drivers[] = {
395	&arizona_ldo1_driver,
396	&madera_ldo1_driver,
397};
398
399static int __init arizona_ldo1_init(void)
400{
401	return platform_register_drivers(madera_ldo1_drivers,
402					 ARRAY_SIZE(madera_ldo1_drivers));
403}
404module_init(arizona_ldo1_init);
405
406static void __exit madera_ldo1_exit(void)
407{
408	platform_unregister_drivers(madera_ldo1_drivers,
409				    ARRAY_SIZE(madera_ldo1_drivers));
410}
411module_exit(madera_ldo1_exit);
412
413/* Module information */
414MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
415MODULE_DESCRIPTION("Arizona LDO1 driver");
416MODULE_LICENSE("GPL");
417MODULE_ALIAS("platform:arizona-ldo1");
418MODULE_ALIAS("platform:madera-ldo1");
419