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 int ret, len, i, j; 33 u32 states_array[8]; 34 35 dev_pdata = dev_get_platdata(dev); 36 uc_pdata = dev_get_uclass_platdata(dev); 37 if (!uc_pdata) 38 return -ENXIO; 39 40 /* Set type to gpio */ 41 uc_pdata->type = REGULATOR_TYPE_GPIO; 42 43 /* 44 * Get gpio regulator gpio desc 45 * Assuming one GPIO per regulator. 46 * Can be extended later to multiple GPIOs 47 * per gpio-regulator. As of now no instance with multiple 48 * gpios is presnt 49 */ 50 gpio = &dev_pdata->gpio; 51 ret = gpio_request_by_name(dev, "gpios", 0, gpio, GPIOD_IS_OUT); 52 if (ret) 53 debug("regulator gpio - not found! Error: %d", ret); 54 55 len = dev_read_size(dev, "states"); 56 if (len < 0) 57 return len; 58 59 len /= sizeof(fdt32_t); 60 61 ret = dev_read_u32_array(dev, "states", states_array, len); 62 if (ret) 63 return -EINVAL; 64 65 for (i = 0, j = 0; i < len; i += 2) { 66 dev_pdata->voltages[j] = states_array[i]; 67 dev_pdata->states[j] = states_array[i + 1]; 68 j++; 69 } 70 71 return 0; 72 } 73 74 static int gpio_regulator_get_value(struct udevice *dev) 75 { 76 struct dm_regulator_uclass_platdata *uc_pdata; 77 struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev); 78 int enable; 79 80 if (!dev_pdata->gpio.dev) 81 return -ENOSYS; 82 83 uc_pdata = dev_get_uclass_platdata(dev); 84 if (uc_pdata->min_uV > uc_pdata->max_uV) { 85 debug("Invalid constraints for: %s\n", uc_pdata->name); 86 return -EINVAL; 87 } 88 89 enable = dm_gpio_get_value(&dev_pdata->gpio); 90 if (enable == dev_pdata->states[0]) 91 return dev_pdata->voltages[0]; 92 else 93 return dev_pdata->voltages[1]; 94 } 95 96 static int gpio_regulator_set_value(struct udevice *dev, int uV) 97 { 98 struct gpio_regulator_platdata *dev_pdata = dev_get_platdata(dev); 99 int ret; 100 bool enable; 101 102 if (!dev_pdata->gpio.dev) 103 return -ENOSYS; 104 105 if (uV == dev_pdata->voltages[0]) 106 enable = dev_pdata->states[0]; 107 else if (uV == dev_pdata->voltages[1]) 108 enable = dev_pdata->states[1]; 109 else 110 return -EINVAL; 111 112 ret = dm_gpio_set_value(&dev_pdata->gpio, enable); 113 if (ret) { 114 pr_err("Can't set regulator : %s gpio to: %d\n", dev->name, 115 enable); 116 return ret; 117 } 118 119 return 0; 120 } 121 122 static const struct dm_regulator_ops gpio_regulator_ops = { 123 .get_value = gpio_regulator_get_value, 124 .set_value = gpio_regulator_set_value, 125 }; 126 127 static const struct udevice_id gpio_regulator_ids[] = { 128 { .compatible = "regulator-gpio" }, 129 { }, 130 }; 131 132 U_BOOT_DRIVER(gpio_regulator) = { 133 .name = "gpio regulator", 134 .id = UCLASS_REGULATOR, 135 .ops = &gpio_regulator_ops, 136 .of_match = gpio_regulator_ids, 137 .ofdata_to_platdata = gpio_regulator_ofdata_to_platdata, 138 .platdata_auto_alloc_size = sizeof(struct gpio_regulator_platdata), 139 }; 140