1 /* 2 * Copyright (C) 2014-2015 Samsung Electronics 3 * Przemyslaw Marczak <p.marczak@samsung.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 <power/pmic.h> 14 #include <power/regulator.h> 15 #include <power/max77686_pmic.h> 16 17 DECLARE_GLOBAL_DATA_PTR; 18 19 static const struct pmic_child_info pmic_childs_info[] = { 20 { .prefix = "ldo", .driver = MAX77686_LDO_DRIVER }, 21 { .prefix = "buck", .driver = MAX77686_BUCK_DRIVER }, 22 { }, 23 }; 24 25 static int max77686_write(struct udevice *dev, uint reg, const uint8_t *buff, 26 int len) 27 { 28 if (dm_i2c_write(dev, reg, buff, len)) { 29 error("write error to device: %p register: %#x!", dev, reg); 30 return -EIO; 31 } 32 33 return 0; 34 } 35 36 static int max77686_read(struct udevice *dev, uint reg, uint8_t *buff, int len) 37 { 38 if (dm_i2c_read(dev, reg, buff, len)) { 39 error("read error from device: %p register: %#x!", dev, reg); 40 return -EIO; 41 } 42 43 return 0; 44 } 45 46 static int max77686_bind(struct udevice *dev) 47 { 48 int regulators_node; 49 const void *blob = gd->fdt_blob; 50 int childs; 51 52 regulators_node = fdt_subnode_offset(blob, dev->of_offset, 53 "voltage-regulators"); 54 if (regulators_node <= 0) { 55 debug("%s: %s regulators subnode not found!", __func__, 56 dev->name); 57 return -ENXIO; 58 } 59 60 debug("%s: '%s' - found regulators subnode\n", __func__, dev->name); 61 62 childs = pmic_bind_childs(dev, regulators_node, pmic_childs_info); 63 if (!childs) 64 debug("%s: %s - no child found\n", __func__, dev->name); 65 66 /* Always return success for this device */ 67 return 0; 68 } 69 70 static struct dm_pmic_ops max77686_ops = { 71 .reg_count = MAX77686_NUM_OF_REGS, 72 .read = max77686_read, 73 .write = max77686_write, 74 }; 75 76 static const struct udevice_id max77686_ids[] = { 77 { .compatible = "maxim,max77686" }, 78 { } 79 }; 80 81 U_BOOT_DRIVER(pmic_max77686) = { 82 .name = "max77686 pmic", 83 .id = UCLASS_PMIC, 84 .of_match = max77686_ids, 85 .bind = max77686_bind, 86 .ops = &max77686_ops, 87 }; 88