1 // SPDX-License-Identifier: GPL-2.0-only
3 * Regulator driver for STw4810/STw4811 VMMC regulator.
5 * Copyright (C) 2013 ST-Ericsson SA
6 * Written on behalf of Linaro for ST-Ericsson
8 * Author: Linus Walleij <linus.walleij@linaro.org>
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>
19 static const unsigned int stw481x_vmmc_voltages
[] = {
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
,
39 static const struct regulator_desc vmmc_regulator
= {
42 .ops
= &stw481x_vmmc_ops
,
43 .type
= REGULATOR_VOLTAGE
,
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
,
55 static int stw481x_vmmc_regulator_probe(struct platform_device
*pdev
)
57 struct stw481x
*stw481x
= dev_get_platdata(&pdev
->dev
);
58 struct regulator_config config
= { };
59 struct regulator_dev
*rdev
;
62 /* First disable the external VMMC if it's active */
63 ret
= regmap_update_bits(stw481x
->map
, STW_CONF2
,
64 STW_CONF2_VMMC_EXT
, 0);
66 dev_err(&pdev
->dev
, "could not disable external VMMC\n");
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(&pdev
->dev
,
79 rdev
= devm_regulator_register(&pdev
->dev
, &vmmc_regulator
, &config
);
82 "error initializing STw481x VMMC regulator\n");
86 dev_info(&pdev
->dev
, "initialized STw481x VMMC regulator\n");
90 static const struct of_device_id stw481x_vmmc_match
[] = {
91 { .compatible
= "st,stw481x-vmmc", },
95 static struct platform_driver stw481x_vmmc_regulator_driver
= {
97 .name
= "stw481x-vmmc-regulator",
98 .of_match_table
= stw481x_vmmc_match
,
100 .probe
= stw481x_vmmc_regulator_probe
,
103 module_platform_driver(stw481x_vmmc_regulator_driver
);