1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Regulator driver for STw4810/STw4811 VMMC regulator. |
4 | * |
5 | * Copyright (C) 2013 ST-Ericsson SA |
6 | * Written on behalf of Linaro for ST-Ericsson |
7 | * |
8 | * Author: Linus Walleij <linus.walleij@linaro.org> |
9 | */ |
10 | |
11 | #include <linux/err.h> |
12 | #include <linux/init.h> |
13 | #include <linux/mfd/stw481x.h> |
14 | #include <linux/module.h> |
15 | #include <linux/platform_device.h> |
16 | #include <linux/regulator/driver.h> |
17 | #include <linux/regulator/of_regulator.h> |
18 | |
19 | static const unsigned int stw481x_vmmc_voltages[] = { |
20 | 1800000, |
21 | 1800000, |
22 | 2850000, |
23 | 3000000, |
24 | 1850000, |
25 | 2600000, |
26 | 2700000, |
27 | 3300000, |
28 | }; |
29 | |
30 | static const struct regulator_ops stw481x_vmmc_ops = { |
31 | .list_voltage = regulator_list_voltage_table, |
32 | .enable = regulator_enable_regmap, |
33 | .disable = regulator_disable_regmap, |
34 | .is_enabled = regulator_is_enabled_regmap, |
35 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
36 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
37 | }; |
38 | |
39 | static const struct regulator_desc vmmc_regulator = { |
40 | .name = "VMMC" , |
41 | .id = 0, |
42 | .ops = &stw481x_vmmc_ops, |
43 | .type = REGULATOR_VOLTAGE, |
44 | .owner = THIS_MODULE, |
45 | .n_voltages = ARRAY_SIZE(stw481x_vmmc_voltages), |
46 | .volt_table = stw481x_vmmc_voltages, |
47 | .enable_time = 200, /* FIXME: look this up */ |
48 | .enable_reg = STW_CONF1, |
49 | .enable_mask = STW_CONF1_PDN_VMMC | STW_CONF1_MMC_LS_STATUS, |
50 | .enable_val = STW_CONF1_PDN_VMMC, |
51 | .vsel_reg = STW_CONF1, |
52 | .vsel_mask = STW_CONF1_VMMC_MASK, |
53 | }; |
54 | |
55 | static int stw481x_vmmc_regulator_probe(struct platform_device *pdev) |
56 | { |
57 | struct stw481x *stw481x = dev_get_platdata(dev: &pdev->dev); |
58 | struct regulator_config config = { }; |
59 | struct regulator_dev *rdev; |
60 | int ret; |
61 | |
62 | /* First disable the external VMMC if it's active */ |
63 | ret = regmap_update_bits(map: stw481x->map, STW_CONF2, |
64 | STW_CONF2_VMMC_EXT, val: 0); |
65 | if (ret) { |
66 | dev_err(&pdev->dev, "could not disable external VMMC\n" ); |
67 | return ret; |
68 | } |
69 | |
70 | /* Register VMMC regulator */ |
71 | config.dev = &pdev->dev; |
72 | config.driver_data = stw481x; |
73 | config.regmap = stw481x->map; |
74 | config.of_node = pdev->dev.of_node; |
75 | config.init_data = of_get_regulator_init_data(dev: &pdev->dev, |
76 | node: pdev->dev.of_node, |
77 | desc: &vmmc_regulator); |
78 | |
79 | rdev = devm_regulator_register(dev: &pdev->dev, regulator_desc: &vmmc_regulator, config: &config); |
80 | if (IS_ERR(ptr: rdev)) { |
81 | dev_err(&pdev->dev, |
82 | "error initializing STw481x VMMC regulator\n" ); |
83 | return PTR_ERR(ptr: rdev); |
84 | } |
85 | |
86 | dev_info(&pdev->dev, "initialized STw481x VMMC regulator\n" ); |
87 | return 0; |
88 | } |
89 | |
90 | static const struct of_device_id stw481x_vmmc_match[] = { |
91 | { .compatible = "st,stw481x-vmmc" , }, |
92 | {}, |
93 | }; |
94 | |
95 | static struct platform_driver stw481x_vmmc_regulator_driver = { |
96 | .driver = { |
97 | .name = "stw481x-vmmc-regulator" , |
98 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
99 | .of_match_table = stw481x_vmmc_match, |
100 | }, |
101 | .probe = stw481x_vmmc_regulator_probe, |
102 | }; |
103 | |
104 | module_platform_driver(stw481x_vmmc_regulator_driver); |
105 | |