2 * Copyright (C) 2015 Samsung Electronics
4 * Przemyslaw Marczak <p.marczak@samsung.com>
6 * SPDX-License-Identifier: GPL-2.0+
14 #include <power/pmic.h>
15 #include <power/regulator.h>
17 struct fixed_regulator_platdata {
18 struct gpio_desc gpio; /* GPIO for regulator enable control */
19 unsigned int startup_delay_us;
22 static int fixed_regulator_ofdata_to_platdata(struct udevice *dev)
24 struct dm_regulator_uclass_platdata *uc_pdata;
25 struct fixed_regulator_platdata *dev_pdata;
26 struct gpio_desc *gpio;
27 int flags = GPIOD_IS_OUT;
30 dev_pdata = dev_get_platdata(dev);
31 uc_pdata = dev_get_uclass_platdata(dev);
35 /* Set type to fixed */
36 uc_pdata->type = REGULATOR_TYPE_FIXED;
38 if (dev_read_bool(dev, "enable-active-high"))
39 flags |= GPIOD_IS_OUT_ACTIVE;
41 /* Get fixed regulator optional enable GPIO desc */
42 gpio = &dev_pdata->gpio;
43 ret = gpio_request_by_name(dev, "gpio", 0, gpio, flags);
45 debug("Fixed regulator optional enable GPIO - not found! Error: %d\n",
51 /* Get optional ramp up delay */
52 dev_pdata->startup_delay_us = dev_read_u32_default(dev,
53 "startup-delay-us", 0);
58 static int fixed_regulator_get_value(struct udevice *dev)
60 struct dm_regulator_uclass_platdata *uc_pdata;
62 uc_pdata = dev_get_uclass_platdata(dev);
66 if (uc_pdata->min_uV != uc_pdata->max_uV) {
67 debug("Invalid constraints for: %s\n", uc_pdata->name);
71 return uc_pdata->min_uV;
74 static int fixed_regulator_get_current(struct udevice *dev)
76 struct dm_regulator_uclass_platdata *uc_pdata;
78 uc_pdata = dev_get_uclass_platdata(dev);
82 if (uc_pdata->min_uA != uc_pdata->max_uA) {
83 debug("Invalid constraints for: %s\n", uc_pdata->name);
87 return uc_pdata->min_uA;
90 static int fixed_regulator_get_enable(struct udevice *dev)
92 struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
94 /* Enable GPIO is optional */
95 if (!dev_pdata->gpio.dev)
98 return dm_gpio_get_value(&dev_pdata->gpio);
101 static int fixed_regulator_set_enable(struct udevice *dev, bool enable)
103 struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev);
106 debug("%s: dev='%s', enable=%d, delay=%d, has_gpio=%d\n", __func__,
107 dev->name, enable, dev_pdata->startup_delay_us,
108 dm_gpio_is_valid(&dev_pdata->gpio));
109 /* Enable GPIO is optional */
110 if (!dm_gpio_is_valid(&dev_pdata->gpio)) {
116 ret = dm_gpio_set_value(&dev_pdata->gpio, enable);
118 pr_err("Can't set regulator : %s gpio to: %d\n", dev->name,
123 if (enable && dev_pdata->startup_delay_us)
124 udelay(dev_pdata->startup_delay_us);
125 debug("%s: done\n", __func__);
130 static const struct dm_regulator_ops fixed_regulator_ops = {
131 .get_value = fixed_regulator_get_value,
132 .get_current = fixed_regulator_get_current,
133 .get_enable = fixed_regulator_get_enable,
134 .set_enable = fixed_regulator_set_enable,
137 static const struct udevice_id fixed_regulator_ids[] = {
138 { .compatible = "regulator-fixed" },
142 U_BOOT_DRIVER(fixed_regulator) = {
143 .name = "fixed regulator",
144 .id = UCLASS_REGULATOR,
145 .ops = &fixed_regulator_ops,
146 .of_match = fixed_regulator_ids,
147 .ofdata_to_platdata = fixed_regulator_ofdata_to_platdata,
148 .platdata_auto_alloc_size = sizeof(struct fixed_regulator_platdata),