1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2016 Texas Instruments Incorporated, <www.ti.com> 4 * Keerthy <j-keerthy@ti.com> 5 */ 6 7 #include <common.h> 8 #include <fdtdec.h> 9 #include <errno.h> 10 #include <dm.h> 11 #include <i2c.h> 12 #include <asm/gpio.h> 13 #include <power/pmic.h> 14 #include <power/regulator.h> 15 16 #define GPIO_REGULATOR_MAX_STATES 2 17 18 DECLARE_GLOBAL_DATA_PTR; 19 20 struct gpio_regulator_platdata { 21 struct gpio_desc gpio; /* GPIO for regulator voltage control */ 22 int states[GPIO_REGULATOR_MAX_STATES]; 23 int voltages[GPIO_REGULATOR_MAX_STATES]; 24 }; 25 26 static int gpio_regulator_ofdata_to_platdata(struct udevice *dev) 27 { 28 struct dm_regulator_uclass_platdata *uc_pdata; 29 struct gpio_regulator_platdata *dev_pdata; 30 struct gpio_desc *gpio; 31 const void *blob = gd->fdt_blob; 32 int node = dev_of_offset(dev); 33 int ret, count, i, j; 34 u32 states_array[8]; 35 36 dev_pdata = dev_get_platdata(dev); 37 uc_pdata = dev_get_uclass_platdata(dev); 38 if (!uc_pdata) 39 return -ENXIO; 40 41 /* Set type to gpio */ 42 uc_pdata->type = REGULATOR_TYPE_GPIO; 43 44 /* 45 * Get gpio regulator gpio desc 46 * Assuming one GPIO per regulator. 47 * Can be extended later to multiple GPIOs 48 * per gpio-regulator. As of now no instance with multiple 49 * gpios is presnt 50 */ 51 gpio = &dev_pdata->gpio; 52 ret = gpio_request_by_name(dev, "gpios", 0, gpio, GPIOD_IS_OUT); 53 if (ret) 54 debug("regulator gpio - not found! Error: %d", ret); 55 56 count = fdtdec_get_int_array_count(blob, node, "states", 57 states_array, 8); 58 59 if (!count) 60 return -EINVAL; 61 62 for (i = 0, j = 0; i < count; i += 2) { 63 dev_pdata->voltages[j] = states_array[i]; 64 dev_pdata->states[j] = states_array[i + 1]; 65 j++; 66 } 67 68 return 0; 69 } 70 71 static int gpio_regulator_get_value(struct udevice *dev) 72 { 73 struct dm_regulator_uclass_platdata *uc_pdata; 74 struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev); 75 int enable; 76 77 if (!dev_pdata->gpio.dev) 78 return -ENOSYS; 79 80 uc_pdata = dev_get_uclass_platdata(dev); 81 if (uc_pdata->min_uV > uc_pdata->max_uV) { 82 debug("Invalid constraints for: %s\n", uc_pdata->name); 83 return -EINVAL; 84 } 85 86 enable = dm_gpio_get_value(&dev_pdata->gpio); 87 if (enable == dev_pdata->states[0]) 88 return dev_pdata->voltages[0]; 89 else 90 return dev_pdata->voltages[1]; 91 } 92 93 static int gpio_regulator_set_value(struct udevice *dev, int uV) 94 { 95 struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev); 96 int ret; 97 bool enable; 98 99 if (!dev_pdata->gpio.dev) 100 return -ENOSYS; 101 102 if (uV == dev_pdata->voltages[0]) 103 enable = dev_pdata->states[0]; 104 else if (uV == dev_pdata->voltages[1]) 105 enable = dev_pdata->states[1]; 106 else 107 return -EINVAL; 108 109 ret = dm_gpio_set_value(&dev_pdata->gpio, enable); 110 if (ret) { 111 pr_err("Can't set regulator : %s gpio to: %d\n", dev->name, 112 enable); 113 return ret; 114 } 115 116 return 0; 117 } 118 119 static const struct dm_regulator_ops gpio_regulator_ops = { 120 .get_value = gpio_regulator_get_value, 121 .set_value = gpio_regulator_set_value, 122 }; 123 124 static const struct udevice_id gpio_regulator_ids[] = { 125 { .compatible = "regulator-gpio" }, 126 { }, 127 }; 128 129 U_BOOT_DRIVER(gpio_regulator) = { 130 .name = "gpio regulator", 131 .id = UCLASS_REGULATOR, 132 .ops = &gpio_regulator_ops, 133 .of_match = gpio_regulator_ids, 134 .ofdata_to_platdata = gpio_regulator_ofdata_to_platdata, 135 .platdata_auto_alloc_size = sizeof(struct gpio_regulator_platdata), 136 }; 137