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git01.mediatek.com / filogic / uboot / dd79d6ebd7b9fbfa948c25e05e3cfd88f5a5df6d / . / drivers / power / regulator / gpio-regulator.c
blob: 42391c69b4307bcf9eaf005570d56186db2469a6 [file] [log] [blame]
Keerthy17b3fe72016-09-15 17:04:06 +0530[diff] [blame]1/*
2 * (C) Copyright 2016 Texas Instruments Incorporated, <www.ti.com>
3 * Keerthy <j-keerthy@ti.com>
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8#include <common.h>
9#include <fdtdec.h>
10#include <errno.h>
11#include <dm.h>
12#include <i2c.h>
13#include <asm/gpio.h>
14#include <power/pmic.h>
15#include <power/regulator.h>
16
17#define GPIO_REGULATOR_MAX_STATES 2
18
19DECLARE_GLOBAL_DATA_PTR;
20
21struct gpio_regulator_platdata {
22 struct gpio_desc gpio; /* GPIO for regulator voltage control */
23 int states[GPIO_REGULATOR_MAX_STATES];
24 int voltages[GPIO_REGULATOR_MAX_STATES];
25};
26
27static int gpio_regulator_ofdata_to_platdata(struct udevice *dev)
28{
29 struct dm_regulator_uclass_platdata *uc_pdata;
30 struct gpio_regulator_platdata *dev_pdata;
31 struct gpio_desc *gpio;
32 const void *blob = gd->fdt_blob;
Simon Glassdd79d6e2017-01-17 16:52:55 -0700[diff] [blame^]33 int node = dev_of_offset(dev);
Keerthy17b3fe72016-09-15 17:04:06 +0530[diff] [blame]34 int ret, count, i, j;
35 u32 states_array[8];
36
37 dev_pdata = dev_get_platdata(dev);
38 uc_pdata = dev_get_uclass_platdata(dev);
39 if (!uc_pdata)
40 return -ENXIO;
41
42 /* Set type to gpio */
43 uc_pdata->type = REGULATOR_TYPE_GPIO;
44
45 /*
46 * Get gpio regulator gpio desc
47 * Assuming one GPIO per regulator.
48 * Can be extended later to multiple GPIOs
49 * per gpio-regulator. As of now no instance with multiple
50 * gpios is presnt
51 */
52 gpio = &dev_pdata->gpio;
53 ret = gpio_request_by_name(dev, "gpios", 0, gpio, GPIOD_IS_OUT);
54 if (ret)
55 debug("regulator gpio - not found! Error: %d", ret);
56
57 count = fdtdec_get_int_array_count(blob, node, "states",
58 states_array, 8);
59
60 if (!count)
61 return -EINVAL;
62
63 for (i = 0, j = 0; i < count; i += 2) {
64 dev_pdata->voltages[j] = states_array[i];
65 dev_pdata->states[j] = states_array[i + 1];
66 j++;
67 }
68
69 return 0;
70}
71
72static int gpio_regulator_get_value(struct udevice *dev)
73{
74 struct dm_regulator_uclass_platdata *uc_pdata;
75 struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev);
76 int enable;
77
78 if (!dev_pdata->gpio.dev)
79 return -ENOSYS;
80
81 uc_pdata = dev_get_uclass_platdata(dev);
82 if (uc_pdata->min_uV > uc_pdata->max_uV) {
83 debug("Invalid constraints for: %s\n", uc_pdata->name);
84 return -EINVAL;
85 }
86
87 enable = dm_gpio_get_value(&dev_pdata->gpio);
88 if (enable == dev_pdata->states[0])
89 return dev_pdata->voltages[0];
90 else
91 return dev_pdata->voltages[1];
92}
93
94static int gpio_regulator_set_value(struct udevice *dev, int uV)
95{
96 struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev);
97 int ret;
98 bool enable;
99
100 if (!dev_pdata->gpio.dev)
101 return -ENOSYS;
102
103 if (uV == dev_pdata->voltages[0])
104 enable = dev_pdata->states[0];
105 else if (uV == dev_pdata->voltages[1])
106 enable = dev_pdata->states[1];
107 else
108 return -EINVAL;
109
110 ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
111 if (ret) {
112 error("Can't set regulator : %s gpio to: %d\n", dev->name,
113 enable);
114 return ret;
115 }
116
117 return 0;
118}
119
120static const struct dm_regulator_ops gpio_regulator_ops = {
121 .get_value = gpio_regulator_get_value,
122 .set_value = gpio_regulator_set_value,
123};
124
125static const struct udevice_id gpio_regulator_ids[] = {
126 { .compatible = "regulator-gpio" },
127 { },
128};
129
130U_BOOT_DRIVER(gpio_regulator) = {
131 .name = "gpio regulator",
132 .id = UCLASS_REGULATOR,
133 .ops = &gpio_regulator_ops,
134 .of_match = gpio_regulator_ids,
135 .ofdata_to_platdata = gpio_regulator_ofdata_to_platdata,
136 .platdata_auto_alloc_size = sizeof(struct gpio_regulator_platdata),
137};