1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2015 Samsung Electronics
4 *
5 * Przemyslaw Marczak <p.marczak@samsung.com>
6 */
7
8 #include <common.h>
9 #include <errno.h>
10 #include <dm.h>
11 #include <i2c.h>
12 #include <asm/gpio.h>
13 #include <power/pmic.h>
14 #include <power/regulator.h>
15
16 struct fixed_regulator_platdata {
17 struct gpio_desc gpio; /* GPIO for regulator enable control */
18 unsigned int startup_delay_us;
19 };
20
fixed_regulator_ofdata_to_platdata(struct udevice * dev)21 static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
22 {
23 struct dm_regulator_uclass_platdata *uc_pdata;
24 struct fixed_regulator_platdata *dev_pdata;
25 struct gpio_desc *gpio;
26 int flags = GPIOD_IS_OUT;
27 int ret;
28
29 dev_pdata = dev_get_platdata(dev);
30 uc_pdata = dev_get_uclass_platdata(dev);
31 if (!uc_pdata)
32 return -ENXIO;
33
34 /* Set type to fixed */
35 uc_pdata->type = REGULATOR_TYPE_FIXED;
36
37 if (dev_read_bool(dev, "enable-active-high"))
38 flags |= GPIOD_IS_OUT_ACTIVE;
39
40 /* Get fixed regulator optional enable GPIO desc */
41 gpio = &dev_pdata->gpio;
42 ret = gpio_request_by_name(dev, "gpio", 0, gpio, flags);
43 if (ret) {
44 debug("Fixed regulator optional enable GPIO - not found! Error: %d\n",
45 ret);
46 if (ret != -ENOENT)
47 return ret;
48 }
49
50 /* Get optional ramp up delay */
51 dev_pdata->startup_delay_us = dev_read_u32_default(dev,
52 "startup-delay-us", 0);
53
54 return 0;
55 }
56
fixed_regulator_get_value(struct udevice * dev)57 static int fixed_regulator_get_value(struct udevice *dev)
58 {
59 struct dm_regulator_uclass_platdata *uc_pdata;
60
61 uc_pdata = dev_get_uclass_platdata(dev);
62 if (!uc_pdata)
63 return -ENXIO;
64
65 if (uc_pdata->min_uV != uc_pdata->max_uV) {
66 debug("Invalid constraints for: %s\n", uc_pdata->name);
67 return -EINVAL;
68 }
69
70 return uc_pdata->min_uV;
71 }
72
fixed_regulator_get_current(struct udevice * dev)73 static int fixed_regulator_get_current(struct udevice *dev)
74 {
75 struct dm_regulator_uclass_platdata *uc_pdata;
76
77 uc_pdata = dev_get_uclass_platdata(dev);
78 if (!uc_pdata)
79 return -ENXIO;
80
81 if (uc_pdata->min_uA != uc_pdata->max_uA) {
82 debug("Invalid constraints for: %s\n", uc_pdata->name);
83 return -EINVAL;
84 }
85
86 return uc_pdata->min_uA;
87 }
88
fixed_regulator_get_enable(struct udevice * dev)89 static int fixed_regulator_get_enable(struct udevice *dev)
90 {
91 struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
92
93 /* Enable GPIO is optional */
94 if (!dev_pdata->gpio.dev)
95 return true;
96
97 return dm_gpio_get_value(&dev_pdata->gpio);
98 }
99
fixed_regulator_set_enable(struct udevice * dev,bool enable)100 static int fixed_regulator_set_enable(struct udevice *dev, bool enable)
101 {
102 struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
103 int ret;
104
105 debug("%s: dev='%s', enable=%d, delay=%d, has_gpio=%d\n", __func__,
106 dev->name, enable, dev_pdata->startup_delay_us,
107 dm_gpio_is_valid(&dev_pdata->gpio));
108 /* Enable GPIO is optional */
109 if (!dm_gpio_is_valid(&dev_pdata->gpio)) {
110 if (!enable)
111 return -ENOSYS;
112 return 0;
113 }
114
115 ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
116 if (ret) {
117 pr_err("Can't set regulator : %s gpio to: %d\n", dev->name,
118 enable);
119 return ret;
120 }
121
122 if (enable && dev_pdata->startup_delay_us)
123 udelay(dev_pdata->startup_delay_us);
124 debug("%s: done\n", __func__);
125
126 return 0;
127 }
128
129 static const struct dm_regulator_ops fixed_regulator_ops = {
130 .get_value = fixed_regulator_get_value,
131 .get_current = fixed_regulator_get_current,
132 .get_enable = fixed_regulator_get_enable,
133 .set_enable = fixed_regulator_set_enable,
134 };
135
136 static const struct udevice_id fixed_regulator_ids[] = {
137 { .compatible = "regulator-fixed" },
138 { },
139 };
140
141 U_BOOT_DRIVER(fixed_regulator) = {
142 .name = "fixed regulator",
143 .id = UCLASS_REGULATOR,
144 .ops = &fixed_regulator_ops,
145 .of_match = fixed_regulator_ids,
146 .ofdata_to_platdata = fixed_regulator_ofdata_to_platdata,
147 .platdata_auto_alloc_size = sizeof(struct fixed_regulator_platdata),
148 };
149