1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2020 ROHM Semiconductors
3 
4 #include <linux/errno.h>
5 #include <linux/mfd/rohm-generic.h>
6 #include <linux/module.h>
7 #include <linux/of.h>
8 #include <linux/regmap.h>
9 #include <linux/regulator/driver.h>
10 
11 static int set_dvs_level(const struct regulator_desc *desc,
12 			 struct device_node *np, struct regmap *regmap,
13 			 char *prop, unsigned int reg, unsigned int mask,
14 			 unsigned int omask, unsigned int oreg)
15 {
16 	int ret, i;
17 	uint32_t uv;
18 
19 	ret = of_property_read_u32(np, prop, &uv);
20 	if (ret) {
21 		if (ret != -EINVAL)
22 			return ret;
23 		return 0;
24 	}
25 
26 	if (uv == 0) {
27 		if (omask)
28 			return regmap_update_bits(regmap, oreg, omask, 0);
29 	}
30 	for (i = 0; i < desc->n_voltages; i++) {
31 		ret = regulator_desc_list_voltage_linear_range(desc, i);
32 		if (ret < 0)
33 			continue;
34 		if (ret == uv) {
35 			i <<= ffs(desc->vsel_mask) - 1;
36 			ret = regmap_update_bits(regmap, reg, mask, i);
37 			if (omask && !ret)
38 				ret = regmap_update_bits(regmap, oreg, omask,
39 							 omask);
40 			break;
41 		}
42 	}
43 	return ret;
44 }
45 
46 int rohm_regulator_set_dvs_levels(const struct rohm_dvs_config *dvs,
47 			  struct device_node *np,
48 			  const struct regulator_desc *desc,
49 			  struct regmap *regmap)
50 {
51 	int i, ret = 0;
52 	char *prop;
53 	unsigned int reg, mask, omask, oreg = desc->enable_reg;
54 
55 	for (i = 0; i < ROHM_DVS_LEVEL_MAX && !ret; i++) {
56 		if (dvs->level_map & (1 << i)) {
57 			switch (i + 1) {
58 			case ROHM_DVS_LEVEL_RUN:
59 				prop = "rohm,dvs-run-voltage";
60 				reg = dvs->run_reg;
61 				mask = dvs->run_mask;
62 				omask = dvs->run_on_mask;
63 				break;
64 			case ROHM_DVS_LEVEL_IDLE:
65 				prop = "rohm,dvs-idle-voltage";
66 				reg = dvs->idle_reg;
67 				mask = dvs->idle_mask;
68 				omask = dvs->idle_on_mask;
69 				break;
70 			case ROHM_DVS_LEVEL_SUSPEND:
71 				prop = "rohm,dvs-suspend-voltage";
72 				reg = dvs->suspend_reg;
73 				mask = dvs->suspend_mask;
74 				omask = dvs->suspend_on_mask;
75 				break;
76 			case ROHM_DVS_LEVEL_LPSR:
77 				prop = "rohm,dvs-lpsr-voltage";
78 				reg = dvs->lpsr_reg;
79 				mask = dvs->lpsr_mask;
80 				omask = dvs->lpsr_on_mask;
81 				break;
82 			default:
83 				return -EINVAL;
84 			}
85 			ret = set_dvs_level(desc, np, regmap, prop, reg, mask,
86 					    omask, oreg);
87 		}
88 	}
89 	return ret;
90 }
91 EXPORT_SYMBOL(rohm_regulator_set_dvs_levels);
92 
93 MODULE_LICENSE("GPL v2");
94 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
95 MODULE_DESCRIPTION("Generic helpers for ROHM PMIC regulator drivers");
96