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 40 if (dev_read_bool(dev, "enable-active-high")) 41 flags |= GPIOD_IS_OUT_ACTIVE; 42 43 /* Get fixed regulator optional enable GPIO desc */ 44 gpio = &dev_pdata->gpio; 45 ret = gpio_request_by_name(dev, "gpio", 0, gpio, flags); 46 if (ret) { 47 debug("Fixed regulator optional enable GPIO - not found! Error: %d\n", 48 ret); 49 if (ret != -ENOENT) 50 return ret; 51 } 52 53 /* Get optional ramp up delay */ 54 dev_pdata->startup_delay_us = dev_read_u32_default(dev, 55 "startup-delay-us", 0); 56 57 return 0; 58 } 59 60 static int fixed_regulator_get_value(struct udevice *dev) 61 { 62 struct dm_regulator_uclass_platdata *uc_pdata; 63 64 uc_pdata = dev_get_uclass_platdata(dev); 65 if (!uc_pdata) 66 return -ENXIO; 67 68 if (uc_pdata->min_uV != uc_pdata->max_uV) { 69 debug("Invalid constraints for: %s\n", uc_pdata->name); 70 return -EINVAL; 71 } 72 73 return uc_pdata->min_uV; 74 } 75 76 static int fixed_regulator_get_current(struct udevice *dev) 77 { 78 struct dm_regulator_uclass_platdata *uc_pdata; 79 80 uc_pdata = dev_get_uclass_platdata(dev); 81 if (!uc_pdata) 82 return -ENXIO; 83 84 if (uc_pdata->min_uA != uc_pdata->max_uA) { 85 debug("Invalid constraints for: %s\n", uc_pdata->name); 86 return -EINVAL; 87 } 88 89 return uc_pdata->min_uA; 90 } 91 92 static int fixed_regulator_get_enable(struct udevice *dev) 93 { 94 struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev); 95 96 /* Enable GPIO is optional */ 97 if (!dev_pdata->gpio.dev) 98 return true; 99 100 return dm_gpio_get_value(&dev_pdata->gpio); 101 } 102 103 static int fixed_regulator_set_enable(struct udevice *dev, bool enable) 104 { 105 struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev); 106 int ret; 107 108 debug("%s: dev='%s', enable=%d, delay=%d, has_gpio=%d\n", __func__, 109 dev->name, enable, dev_pdata->startup_delay_us, 110 dm_gpio_is_valid(&dev_pdata->gpio)); 111 /* Enable GPIO is optional */ 112 if (!dm_gpio_is_valid(&dev_pdata->gpio)) { 113 if (!enable) 114 return -ENOSYS; 115 return 0; 116 } 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 if (enable && dev_pdata->startup_delay_us) 126 udelay(dev_pdata->startup_delay_us); 127 debug("%s: done\n", __func__); 128 129 return 0; 130 } 131 132 static const struct dm_regulator_ops fixed_regulator_ops = { 133 .get_value = fixed_regulator_get_value, 134 .get_current = fixed_regulator_get_current, 135 .get_enable = fixed_regulator_get_enable, 136 .set_enable = fixed_regulator_set_enable, 137 }; 138 139 static const struct udevice_id fixed_regulator_ids[] = { 140 { .compatible = "regulator-fixed" }, 141 { }, 142 }; 143 144 U_BOOT_DRIVER(fixed_regulator) = { 145 .name = "fixed regulator", 146 .id = UCLASS_REGULATOR, 147 .ops = &fixed_regulator_ops, 148 .of_match = fixed_regulator_ids, 149 .ofdata_to_platdata = fixed_regulator_ofdata_to_platdata, 150 .platdata_auto_alloc_size = sizeof(struct fixed_regulator_platdata), 151 }; 152