WIP FPC-III support
[linux/fpc-iii.git] / drivers / regulator / rohm-regulator.c
blob399002383b28bc048ceb2506baefdea688ef8410
1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2020 ROHM Semiconductors
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>
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)
16 int ret, i;
17 uint32_t uv;
19 ret = of_property_read_u32(np, prop, &uv);
20 if (ret) {
21 if (ret != -EINVAL)
22 return ret;
23 return 0;
26 if (uv == 0) {
27 if (omask)
28 return regmap_update_bits(regmap, oreg, omask, 0);
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;
43 return ret;
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)
51 int i, ret = 0;
52 char *prop;
53 unsigned int reg, mask, omask, oreg = desc->enable_reg;
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;
85 ret = set_dvs_level(desc, np, regmap, prop, reg, mask,
86 omask, oreg);
89 return ret;
91 EXPORT_SYMBOL(rohm_regulator_set_dvs_levels);
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");