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 <fdtdec.h> 11 #include <errno.h> 12 #include <dm.h> 13 #include <i2c.h> 14 #include <asm/gpio.h> 15 #include <power/pmic.h> 16 #include <power/regulator.h> 17 18 DECLARE_GLOBAL_DATA_PTR; 19 20 struct fixed_regulator_platdata { 21 struct gpio_desc gpio; /* GPIO for regulator enable control */ 22 unsigned int startup_delay_us; 23 }; 24 25 static int fixed_regulator_ofdata_to_platdata(struct udevice *dev) 26 { 27 struct dm_regulator_uclass_platdata *uc_pdata; 28 struct fixed_regulator_platdata *dev_pdata; 29 struct gpio_desc *gpio; 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 /* Get fixed regulator optional enable GPIO desc */ 41 gpio = &dev_pdata->gpio; 42 ret = gpio_request_by_name(dev, "gpio", 0, gpio, GPIOD_IS_OUT); 43 if (ret) { 44 debug("Fixed regulator optional enable GPIO - not found! Error: %d\n", 45 ret); 46 if (ret != -ENOENT) 47 return ret; 48 } 49 50 /* Get optional ramp up delay */ 51 dev_pdata->startup_delay_us = fdtdec_get_uint(gd->fdt_blob, 52 dev->of_offset, 53 "startup-delay-us", 0); 54 55 return 0; 56 } 57 58 static int fixed_regulator_get_value(struct udevice *dev) 59 { 60 struct dm_regulator_uclass_platdata *uc_pdata; 61 62 uc_pdata = dev_get_uclass_platdata(dev); 63 if (!uc_pdata) 64 return -ENXIO; 65 66 if (uc_pdata->min_uV != uc_pdata->max_uV) { 67 debug("Invalid constraints for: %s\n", uc_pdata->name); 68 return -EINVAL; 69 } 70 71 return uc_pdata->min_uV; 72 } 73 74 static int fixed_regulator_get_current(struct udevice *dev) 75 { 76 struct dm_regulator_uclass_platdata *uc_pdata; 77 78 uc_pdata = dev_get_uclass_platdata(dev); 79 if (!uc_pdata) 80 return -ENXIO; 81 82 if (uc_pdata->min_uA != uc_pdata->max_uA) { 83 debug("Invalid constraints for: %s\n", uc_pdata->name); 84 return -EINVAL; 85 } 86 87 return uc_pdata->min_uA; 88 } 89 90 static bool fixed_regulator_get_enable(struct udevice *dev) 91 { 92 struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev); 93 94 /* Enable GPIO is optional */ 95 if (!dev_pdata->gpio.dev) 96 return true; 97 98 return dm_gpio_get_value(&dev_pdata->gpio); 99 } 100 101 static int fixed_regulator_set_enable(struct udevice *dev, bool enable) 102 { 103 struct fixed_regulator_platdata *dev_pdata = dev_get_platdata(dev); 104 int ret; 105 106 /* Enable GPIO is optional */ 107 if (!dev_pdata->gpio.dev) { 108 if (!enable) 109 return -ENOSYS; 110 return 0; 111 } 112 113 ret = dm_gpio_set_value(&dev_pdata->gpio, enable); 114 if (ret) { 115 error("Can't set regulator : %s gpio to: %d\n", dev->name, 116 enable); 117 return ret; 118 } 119 120 if (enable && dev_pdata->startup_delay_us) 121 udelay(dev_pdata->startup_delay_us); 122 123 return 0; 124 } 125 126 static const struct dm_regulator_ops fixed_regulator_ops = { 127 .get_value = fixed_regulator_get_value, 128 .get_current = fixed_regulator_get_current, 129 .get_enable = fixed_regulator_get_enable, 130 .set_enable = fixed_regulator_set_enable, 131 }; 132 133 static const struct udevice_id fixed_regulator_ids[] = { 134 { .compatible = "regulator-fixed" }, 135 { }, 136 }; 137 138 U_BOOT_DRIVER(fixed_regulator) = { 139 .name = "fixed regulator", 140 .id = UCLASS_REGULATOR, 141 .ops = &fixed_regulator_ops, 142 .of_match = fixed_regulator_ids, 143 .ofdata_to_platdata = fixed_regulator_ofdata_to_platdata, 144 .platdata_auto_alloc_size = sizeof(struct fixed_regulator_platdata), 145 }; 146