1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) STMicroelectronics 2019
3 // Author(s): Fabrice Gasnier <fabrice.gasnier@st.com>.
5 #include <linux/mfd/syscon.h>
6 #include <linux/module.h>
7 #include <linux/of_device.h>
8 #include <linux/platform_device.h>
9 #include <linux/regmap.h>
10 #include <linux/regulator/driver.h>
11 #include <linux/regulator/of_regulator.h>
13 /* STM32H7 SYSCFG register */
14 #define STM32H7_SYSCFG_PMCR 0x04
15 #define STM32H7_SYSCFG_BOOSTE_MASK BIT(8)
17 /* STM32MP1 SYSCFG has set and clear registers */
18 #define STM32MP1_SYSCFG_PMCSETR 0x04
19 #define STM32MP1_SYSCFG_PMCCLRR 0x44
20 #define STM32MP1_SYSCFG_EN_BOOSTER_MASK BIT(8)
22 static const struct regulator_ops stm32h7_booster_ops
= {
23 .enable
= regulator_enable_regmap
,
24 .disable
= regulator_disable_regmap
,
25 .is_enabled
= regulator_is_enabled_regmap
,
28 static const struct regulator_desc stm32h7_booster_desc
= {
30 .supply_name
= "vdda",
32 .type
= REGULATOR_VOLTAGE
,
34 .ramp_delay
= 66000, /* up to 50us to stabilize */
35 .ops
= &stm32h7_booster_ops
,
36 .enable_reg
= STM32H7_SYSCFG_PMCR
,
37 .enable_mask
= STM32H7_SYSCFG_BOOSTE_MASK
,
41 static int stm32mp1_booster_enable(struct regulator_dev
*rdev
)
43 return regmap_write(rdev
->regmap
, STM32MP1_SYSCFG_PMCSETR
,
44 STM32MP1_SYSCFG_EN_BOOSTER_MASK
);
47 static int stm32mp1_booster_disable(struct regulator_dev
*rdev
)
49 return regmap_write(rdev
->regmap
, STM32MP1_SYSCFG_PMCCLRR
,
50 STM32MP1_SYSCFG_EN_BOOSTER_MASK
);
53 static const struct regulator_ops stm32mp1_booster_ops
= {
54 .enable
= stm32mp1_booster_enable
,
55 .disable
= stm32mp1_booster_disable
,
56 .is_enabled
= regulator_is_enabled_regmap
,
59 static const struct regulator_desc stm32mp1_booster_desc
= {
61 .supply_name
= "vdda",
63 .type
= REGULATOR_VOLTAGE
,
66 .ops
= &stm32mp1_booster_ops
,
67 .enable_reg
= STM32MP1_SYSCFG_PMCSETR
,
68 .enable_mask
= STM32MP1_SYSCFG_EN_BOOSTER_MASK
,
72 static int stm32_booster_probe(struct platform_device
*pdev
)
74 struct device
*dev
= &pdev
->dev
;
75 struct device_node
*np
= pdev
->dev
.of_node
;
76 struct regulator_config config
= { };
77 const struct regulator_desc
*desc
;
78 struct regulator_dev
*rdev
;
79 struct regmap
*regmap
;
82 regmap
= syscon_regmap_lookup_by_phandle(np
, "st,syscfg");
84 return PTR_ERR(regmap
);
86 desc
= (const struct regulator_desc
*)
87 of_match_device(dev
->driver
->of_match_table
, dev
)->data
;
89 config
.regmap
= regmap
;
92 config
.init_data
= of_get_regulator_init_data(dev
, np
, desc
);
94 rdev
= devm_regulator_register(dev
, desc
, &config
);
97 dev_err(dev
, "register failed with error %d\n", ret
);
104 static const struct of_device_id __maybe_unused stm32_booster_of_match
[] = {
106 .compatible
= "st,stm32h7-booster",
107 .data
= (void *)&stm32h7_booster_desc
109 .compatible
= "st,stm32mp1-booster",
110 .data
= (void *)&stm32mp1_booster_desc
114 MODULE_DEVICE_TABLE(of
, stm32_booster_of_match
);
116 static struct platform_driver stm32_booster_driver
= {
117 .probe
= stm32_booster_probe
,
119 .name
= "stm32-booster",
120 .of_match_table
= of_match_ptr(stm32_booster_of_match
),
123 module_platform_driver(stm32_booster_driver
);
125 MODULE_LICENSE("GPL v2");
126 MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
127 MODULE_DESCRIPTION("STMicroelectronics STM32 booster regulator driver");
128 MODULE_ALIAS("platform:stm32-booster");