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 19 DECLARE_GLOBAL_DATA_PTR; 20 21 struct 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 27 static 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; 33 int node = dev_of_offset(dev); 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 72 static 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 94 static 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 pr_err("Can't set regulator : %s gpio to: %d\n", dev->name, 113 enable); 114 return ret; 115 } 116 117 return 0; 118 } 119 120 static const struct dm_regulator_ops gpio_regulator_ops = { 121 .get_value = gpio_regulator_get_value, 122 .set_value = gpio_regulator_set_value, 123 }; 124 125 static const struct udevice_id gpio_regulator_ids[] = { 126 { .compatible = "regulator-gpio" }, 127 { }, 128 }; 129 130 U_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 }; 138