1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2016 Texas Instruments Incorporated, <www.ti.com>
4 * Keerthy <j-keerthy@ti.com>
5 */
6
7 #include <common.h>
8 #include <fdtdec.h>
9 #include <errno.h>
10 #include <dm.h>
11 #include <i2c.h>
12 #include <log.h>
13 #include <asm/gpio.h>
14 #include <power/pmic.h>
15 #include <power/regulator.h>
16
17 #include "regulator_common.h"
18
19 #define GPIO_REGULATOR_MAX_STATES 2
20
21 struct gpio_regulator_plat {
22 struct regulator_common_plat common;
23 struct gpio_desc gpio; /* GPIO for regulator voltage control */
24 int states[GPIO_REGULATOR_MAX_STATES];
25 int voltages[GPIO_REGULATOR_MAX_STATES];
26 };
27
gpio_regulator_of_to_plat(struct udevice * dev)28 static int gpio_regulator_of_to_plat(struct udevice *dev)
29 {
30 struct dm_regulator_uclass_plat *uc_pdata;
31 struct gpio_regulator_plat *dev_pdata;
32 struct gpio_desc *gpio;
33 int ret, count, i, j;
34 u32 states_array[GPIO_REGULATOR_MAX_STATES * 2];
35
36 dev_pdata = dev_get_plat(dev);
37 uc_pdata = dev_get_uclass_plat(dev);
38 if (!uc_pdata)
39 return -ENXIO;
40
41 /* Set type to gpio */
42 uc_pdata->type = REGULATOR_TYPE_GPIO;
43
44 /*
45 * Get gpio regulator gpio desc
46 * Assuming one GPIO per regulator.
47 * Can be extended later to multiple GPIOs
48 * per gpio-regulator. As of now no instance with multiple
49 * gpios is presnt
50 */
51 gpio = &dev_pdata->gpio;
52 ret = gpio_request_by_name(dev, "gpios", 0, gpio, GPIOD_IS_OUT);
53 if (ret)
54 debug("regulator gpio - not found! Error: %d", ret);
55
56 ret = dev_read_size(dev, "states");
57 if (ret < 0)
58 return ret;
59
60 count = ret / sizeof(states_array[0]);
61 if (count > ARRAY_SIZE(states_array)) {
62 debug("regulator gpio - to many states (%d > %d)",
63 count / 2, GPIO_REGULATOR_MAX_STATES);
64 count = ARRAY_SIZE(states_array);
65 }
66
67 ret = dev_read_u32_array(dev, "states", states_array, count);
68 if (ret < 0)
69 return ret;
70
71 for (i = 0, j = 0; i < count; i += 2) {
72 dev_pdata->voltages[j] = states_array[i];
73 dev_pdata->states[j] = states_array[i + 1];
74 j++;
75 }
76
77 return regulator_common_of_to_plat(dev, &dev_pdata->common, "enable-gpios");
78 }
79
gpio_regulator_get_value(struct udevice * dev)80 static int gpio_regulator_get_value(struct udevice *dev)
81 {
82 struct dm_regulator_uclass_plat *uc_pdata;
83 struct gpio_regulator_plat *dev_pdata = dev_get_plat(dev);
84 int enable;
85
86 if (!dev_pdata->gpio.dev)
87 return -ENOSYS;
88
89 uc_pdata = dev_get_uclass_plat(dev);
90 if (uc_pdata->min_uV > uc_pdata->max_uV) {
91 debug("Invalid constraints for: %s\n", uc_pdata->name);
92 return -EINVAL;
93 }
94
95 enable = dm_gpio_get_value(&dev_pdata->gpio);
96 if (enable == dev_pdata->states[0])
97 return dev_pdata->voltages[0];
98 else
99 return dev_pdata->voltages[1];
100 }
101
gpio_regulator_set_value(struct udevice * dev,int uV)102 static int gpio_regulator_set_value(struct udevice *dev, int uV)
103 {
104 struct gpio_regulator_plat *dev_pdata = dev_get_plat(dev);
105 int ret;
106 bool enable;
107
108 if (!dev_pdata->gpio.dev)
109 return -ENOSYS;
110
111 if (uV == dev_pdata->voltages[0])
112 enable = dev_pdata->states[0];
113 else if (uV == dev_pdata->voltages[1])
114 enable = dev_pdata->states[1];
115 else
116 return -EINVAL;
117
118 ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
119 if (ret) {
120 pr_err("Can't set regulator : %s gpio to: %d\n", dev->name,
121 enable);
122 return ret;
123 }
124
125 return 0;
126 }
127
gpio_regulator_get_enable(struct udevice * dev)128 static int gpio_regulator_get_enable(struct udevice *dev)
129 {
130 struct gpio_regulator_plat *dev_pdata = dev_get_plat(dev);
131 return regulator_common_get_enable(dev, &dev_pdata->common);
132 }
133
gpio_regulator_set_enable(struct udevice * dev,bool enable)134 static int gpio_regulator_set_enable(struct udevice *dev, bool enable)
135 {
136 struct gpio_regulator_plat *dev_pdata = dev_get_plat(dev);
137 return regulator_common_set_enable(dev, &dev_pdata->common, enable);
138 }
139
140 static const struct dm_regulator_ops gpio_regulator_ops = {
141 .get_value = gpio_regulator_get_value,
142 .set_value = gpio_regulator_set_value,
143 .get_enable = gpio_regulator_get_enable,
144 .set_enable = gpio_regulator_set_enable,
145 };
146
147 static const struct udevice_id gpio_regulator_ids[] = {
148 { .compatible = "regulator-gpio" },
149 { },
150 };
151
152 U_BOOT_DRIVER(gpio_regulator) = {
153 .name = "gpio regulator",
154 .id = UCLASS_REGULATOR,
155 .ops = &gpio_regulator_ops,
156 .of_match = gpio_regulator_ids,
157 .of_to_plat = gpio_regulator_of_to_plat,
158 .plat_auto = sizeof(struct gpio_regulator_plat),
159 };
160