1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Regulator driver for STw4810/STw4811 VMMC regulator.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2013 ST-Ericsson SA
6*4882a593Smuzhiyun * Written on behalf of Linaro for ST-Ericsson
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * Author: Linus Walleij <linus.walleij@linaro.org>
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <linux/err.h>
12*4882a593Smuzhiyun #include <linux/init.h>
13*4882a593Smuzhiyun #include <linux/mfd/stw481x.h>
14*4882a593Smuzhiyun #include <linux/module.h>
15*4882a593Smuzhiyun #include <linux/platform_device.h>
16*4882a593Smuzhiyun #include <linux/regulator/driver.h>
17*4882a593Smuzhiyun #include <linux/regulator/of_regulator.h>
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun static const unsigned int stw481x_vmmc_voltages[] = {
20*4882a593Smuzhiyun 1800000,
21*4882a593Smuzhiyun 1800000,
22*4882a593Smuzhiyun 2850000,
23*4882a593Smuzhiyun 3000000,
24*4882a593Smuzhiyun 1850000,
25*4882a593Smuzhiyun 2600000,
26*4882a593Smuzhiyun 2700000,
27*4882a593Smuzhiyun 3300000,
28*4882a593Smuzhiyun };
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun static const struct regulator_ops stw481x_vmmc_ops = {
31*4882a593Smuzhiyun .list_voltage = regulator_list_voltage_table,
32*4882a593Smuzhiyun .enable = regulator_enable_regmap,
33*4882a593Smuzhiyun .disable = regulator_disable_regmap,
34*4882a593Smuzhiyun .is_enabled = regulator_is_enabled_regmap,
35*4882a593Smuzhiyun .get_voltage_sel = regulator_get_voltage_sel_regmap,
36*4882a593Smuzhiyun .set_voltage_sel = regulator_set_voltage_sel_regmap,
37*4882a593Smuzhiyun };
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun static const struct regulator_desc vmmc_regulator = {
40*4882a593Smuzhiyun .name = "VMMC",
41*4882a593Smuzhiyun .id = 0,
42*4882a593Smuzhiyun .ops = &stw481x_vmmc_ops,
43*4882a593Smuzhiyun .type = REGULATOR_VOLTAGE,
44*4882a593Smuzhiyun .owner = THIS_MODULE,
45*4882a593Smuzhiyun .n_voltages = ARRAY_SIZE(stw481x_vmmc_voltages),
46*4882a593Smuzhiyun .volt_table = stw481x_vmmc_voltages,
47*4882a593Smuzhiyun .enable_time = 200, /* FIXME: look this up */
48*4882a593Smuzhiyun .enable_reg = STW_CONF1,
49*4882a593Smuzhiyun .enable_mask = STW_CONF1_PDN_VMMC | STW_CONF1_MMC_LS_STATUS,
50*4882a593Smuzhiyun .enable_val = STW_CONF1_PDN_VMMC,
51*4882a593Smuzhiyun .vsel_reg = STW_CONF1,
52*4882a593Smuzhiyun .vsel_mask = STW_CONF1_VMMC_MASK,
53*4882a593Smuzhiyun };
54*4882a593Smuzhiyun
stw481x_vmmc_regulator_probe(struct platform_device * pdev)55*4882a593Smuzhiyun static int stw481x_vmmc_regulator_probe(struct platform_device *pdev)
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun struct stw481x *stw481x = dev_get_platdata(&pdev->dev);
58*4882a593Smuzhiyun struct regulator_config config = { };
59*4882a593Smuzhiyun struct regulator_dev *rdev;
60*4882a593Smuzhiyun int ret;
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun /* First disable the external VMMC if it's active */
63*4882a593Smuzhiyun ret = regmap_update_bits(stw481x->map, STW_CONF2,
64*4882a593Smuzhiyun STW_CONF2_VMMC_EXT, 0);
65*4882a593Smuzhiyun if (ret) {
66*4882a593Smuzhiyun dev_err(&pdev->dev, "could not disable external VMMC\n");
67*4882a593Smuzhiyun return ret;
68*4882a593Smuzhiyun }
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun /* Register VMMC regulator */
71*4882a593Smuzhiyun config.dev = &pdev->dev;
72*4882a593Smuzhiyun config.driver_data = stw481x;
73*4882a593Smuzhiyun config.regmap = stw481x->map;
74*4882a593Smuzhiyun config.of_node = pdev->dev.of_node;
75*4882a593Smuzhiyun config.init_data = of_get_regulator_init_data(&pdev->dev,
76*4882a593Smuzhiyun pdev->dev.of_node,
77*4882a593Smuzhiyun &vmmc_regulator);
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun rdev = devm_regulator_register(&pdev->dev, &vmmc_regulator, &config);
80*4882a593Smuzhiyun if (IS_ERR(rdev)) {
81*4882a593Smuzhiyun dev_err(&pdev->dev,
82*4882a593Smuzhiyun "error initializing STw481x VMMC regulator\n");
83*4882a593Smuzhiyun return PTR_ERR(rdev);
84*4882a593Smuzhiyun }
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun dev_info(&pdev->dev, "initialized STw481x VMMC regulator\n");
87*4882a593Smuzhiyun return 0;
88*4882a593Smuzhiyun }
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun static const struct of_device_id stw481x_vmmc_match[] = {
91*4882a593Smuzhiyun { .compatible = "st,stw481x-vmmc", },
92*4882a593Smuzhiyun {},
93*4882a593Smuzhiyun };
94*4882a593Smuzhiyun
95*4882a593Smuzhiyun static struct platform_driver stw481x_vmmc_regulator_driver = {
96*4882a593Smuzhiyun .driver = {
97*4882a593Smuzhiyun .name = "stw481x-vmmc-regulator",
98*4882a593Smuzhiyun .of_match_table = stw481x_vmmc_match,
99*4882a593Smuzhiyun },
100*4882a593Smuzhiyun .probe = stw481x_vmmc_regulator_probe,
101*4882a593Smuzhiyun };
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun module_platform_driver(stw481x_vmmc_regulator_driver);
104