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 <asm/gpio.h>
13 #include <power/pmic.h>
14 #include <power/regulator.h>
15
16 #define GPIO_REGULATOR_MAX_STATES 2
17
18 DECLARE_GLOBAL_DATA_PTR;
19
20 struct gpio_regulator_platdata {
21 struct gpio_desc gpio; /* GPIO for regulator voltage control */
22 int states[GPIO_REGULATOR_MAX_STATES];
23 int voltages[GPIO_REGULATOR_MAX_STATES];
24 };
25
gpio_regulator_ofdata_to_platdata(struct udevice * dev)26 static int gpio_regulator_ofdata_to_platdata(struct udevice *dev)
27 {
28 struct dm_regulator_uclass_platdata *uc_pdata;
29 struct gpio_regulator_platdata *dev_pdata;
30 struct gpio_desc *gpio;
31 const void *blob = gd->fdt_blob;
32 int node = dev_of_offset(dev);
33 int ret, count, i, j;
34 u32 states_array[8];
35
36 dev_pdata = dev_get_platdata(dev);
37 uc_pdata = dev_get_uclass_platdata(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 count = fdtdec_get_int_array_count(blob, node, "states",
57 states_array, 8);
58
59 if (!count)
60 return -EINVAL;
61
62 for (i = 0, j = 0; i < count; i += 2) {
63 dev_pdata->voltages[j] = states_array[i];
64 dev_pdata->states[j] = states_array[i + 1];
65 j++;
66 }
67
68 return 0;
69 }
70
gpio_regulator_get_value(struct udevice * dev)71 static int gpio_regulator_get_value(struct udevice *dev)
72 {
73 struct dm_regulator_uclass_platdata *uc_pdata;
74 struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev);
75 int enable;
76
77 if (!dev_pdata->gpio.dev)
78 return -ENOSYS;
79
80 uc_pdata = dev_get_uclass_platdata(dev);
81 if (uc_pdata->min_uV > uc_pdata->max_uV) {
82 debug("Invalid constraints for: %s\n", uc_pdata->name);
83 return -EINVAL;
84 }
85
86 enable = dm_gpio_get_value(&dev_pdata->gpio);
87 if (enable == dev_pdata->states[0])
88 return dev_pdata->voltages[0];
89 else
90 return dev_pdata->voltages[1];
91 }
92
gpio_regulator_set_value(struct udevice * dev,int uV)93 static int gpio_regulator_set_value(struct udevice *dev, int uV)
94 {
95 struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev);
96 int ret;
97 bool enable;
98
99 if (!dev_pdata->gpio.dev)
100 return -ENOSYS;
101
102 if (uV == dev_pdata->voltages[0])
103 enable = dev_pdata->states[0];
104 else if (uV == dev_pdata->voltages[1])
105 enable = dev_pdata->states[1];
106 else
107 return -EINVAL;
108
109 ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
110 if (ret) {
111 pr_err("Can't set regulator : %s gpio to: %d\n", dev->name,
112 enable);
113 return ret;
114 }
115
116 return 0;
117 }
118
119 static const struct dm_regulator_ops gpio_regulator_ops = {
120 .get_value = gpio_regulator_get_value,
121 .set_value = gpio_regulator_set_value,
122 };
123
124 static const struct udevice_id gpio_regulator_ids[] = {
125 { .compatible = "regulator-gpio" },
126 { },
127 };
128
129 U_BOOT_DRIVER(gpio_regulator) = {
130 .name = "gpio regulator",
131 .id = UCLASS_REGULATOR,
132 .ops = &gpio_regulator_ops,
133 .of_match = gpio_regulator_ids,
134 .ofdata_to_platdata = gpio_regulator_ofdata_to_platdata,
135 .platdata_auto_alloc_size = sizeof(struct gpio_regulator_platdata),
136 };
137