1 /* 2 * Copyright (C) 2015 Samsung Electronics 3 * 4 * Przemyslaw Marczak <p.marczak@samsung.com> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.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 DECLARE_GLOBAL_DATA_PTR; 18 19 struct fixed_regulator_platdata { 20 struct gpio_desc gpio; /* GPIO for regulator enable control */ 21 unsigned int startup_delay_us; 22 }; 23 24 static int fixed_regulator_ofdata_to_platdata(struct udevice *dev) 25 { 26 struct dm_regulator_uclass_platdata *uc_pdata; 27 struct fixed_regulator_platdata *dev_pdata; 28 struct gpio_desc *gpio; 29 int flags = GPIOD_IS_OUT; 30 int ret; 31 32 dev_pdata = dev_get_platdata(dev); 33 uc_pdata = dev_get_uclass_platdata(dev); 34 if (!uc_pdata) 35 return -ENXIO; 36 37 /* Set type to fixed */ 38 uc_pdata->type = REGULATOR_TYPE_FIXED; 39 if (!dev_read_bool(dev, "enable-active-high")) 40 flags |= GPIOD_ACTIVE_LOW; 41 if (dev_read_bool(dev, "regulator-boot-on")) 42 flags |= GPIOD_IS_OUT_ACTIVE; 43 44 /* Get fixed regulator optional enable GPIO desc */ 45 gpio = &dev_pdata->gpio; 46 ret = gpio_request_by_name(dev, "gpio", 0, gpio, flags); 47 if (ret) { 48 ret = gpio_request_by_name(dev, "gpios", 0, gpio, flags); 49 if (ret) { 50 debug("Fixed regulator optional enable GPIO - not found! Error: %d\n", ret); 51 if (ret != -ENOENT) 52 return ret; 53 } 54 } 55 56 /* Get optional ramp up delay */ 57 dev_pdata->startup_delay_us = dev_read_u32_default(dev, 58 "startup-delay-us", 0); 59 60 return 0; 61 } 62 63 static int fixed_regulator_get_value(struct udevice *dev) 64 { 65 struct dm_regulator_uclass_platdata *uc_pdata; 66 67 uc_pdata = dev_get_uclass_platdata(dev); 68 if (!uc_pdata) 69 return -ENXIO; 70 71 if (uc_pdata->min_uV != uc_pdata->max_uV) { 72 debug("Invalid constraints for: %s\n", uc_pdata->name); 73 return -EINVAL; 74 } 75 76 return uc_pdata->min_uV; 77 } 78 79 static int fixed_regulator_get_current(struct udevice *dev) 80 { 81 struct dm_regulator_uclass_platdata *uc_pdata; 82 83 uc_pdata = dev_get_uclass_platdata(dev); 84 if (!uc_pdata) 85 return -ENXIO; 86 87 if (uc_pdata->min_uA != uc_pdata->max_uA) { 88 debug("Invalid constraints for: %s\n", uc_pdata->name); 89 return -EINVAL; 90 } 91 92 return uc_pdata->min_uA; 93 } 94 95 static int fixed_regulator_get_enable(struct udevice *dev) 96 { 97 struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev); 98 99 /* Enable GPIO is optional */ 100 if (!dev_pdata->gpio.dev) 101 return true; 102 103 return dm_gpio_get_value(&dev_pdata->gpio); 104 } 105 106 static int fixed_regulator_set_enable(struct udevice *dev, bool enable) 107 { 108 struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev); 109 int ret; 110 111 debug("%s: dev='%s', enable=%d, delay=%d, has_gpio=%d\n", __func__, 112 dev->name, enable, dev_pdata->startup_delay_us, 113 dm_gpio_is_valid(&dev_pdata->gpio)); 114 /* Enable GPIO is optional */ 115 if (!dm_gpio_is_valid(&dev_pdata->gpio)) { 116 if (!enable) 117 return -ENOSYS; 118 return 0; 119 } 120 121 ret = dm_gpio_set_value(&dev_pdata->gpio, enable); 122 if (ret) { 123 pr_err("Can't set regulator : %s gpio to: %d\n", dev->name, 124 enable); 125 return ret; 126 } 127 128 if (enable && dev_pdata->startup_delay_us) 129 udelay(dev_pdata->startup_delay_us); 130 debug("%s: done\n", __func__); 131 132 return 0; 133 } 134 135 static const struct dm_regulator_ops fixed_regulator_ops = { 136 .get_value = fixed_regulator_get_value, 137 .get_current = fixed_regulator_get_current, 138 .get_enable = fixed_regulator_get_enable, 139 .set_enable = fixed_regulator_set_enable, 140 }; 141 142 static const struct udevice_id fixed_regulator_ids[] = { 143 { .compatible = "regulator-fixed" }, 144 { }, 145 }; 146 147 U_BOOT_DRIVER(fixed_regulator) = { 148 .name = "fixed regulator", 149 .id = UCLASS_REGULATOR, 150 .ops = &fixed_regulator_ops, 151 .of_match = fixed_regulator_ids, 152 .ofdata_to_platdata = fixed_regulator_ofdata_to_platdata, 153 .platdata_auto_alloc_size = sizeof(struct fixed_regulator_platdata), 154 }; 155