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_children_info[] = { 20 { .prefix = "ldo", .driver = MAX77686_LDO_DRIVER }, 21 { .prefix = "buck", .driver = MAX77686_BUCK_DRIVER }, 22 { }, 23 }; 24 25 static int max77686_reg_count(struct udevice *dev) 26 { 27 return MAX77686_NUM_OF_REGS; 28 } 29 30 static int max77686_write(struct udevice *dev, uint reg, const uint8_t *buff, 31 int len) 32 { 33 if (dm_i2c_write(dev, reg, buff, len)) { 34 error("write error to device: %p register: %#x!", dev, reg); 35 return -EIO; 36 } 37 38 return 0; 39 } 40 41 static int max77686_read(struct udevice *dev, uint reg, uint8_t *buff, int len) 42 { 43 if (dm_i2c_read(dev, reg, buff, len)) { 44 error("read error from device: %p register: %#x!", dev, reg); 45 return -EIO; 46 } 47 48 return 0; 49 } 50 51 static int max77686_bind(struct udevice *dev) 52 { 53 int regulators_node; 54 const void *blob = gd->fdt_blob; 55 int children; 56 57 regulators_node = fdt_subnode_offset(blob, dev->of_offset, 58 "voltage-regulators"); 59 if (regulators_node <= 0) { 60 debug("%s: %s regulators subnode not found!", __func__, 61 dev->name); 62 return -ENXIO; 63 } 64 65 debug("%s: '%s' - found regulators subnode\n", __func__, dev->name); 66 67 children = pmic_bind_children(dev, regulators_node, pmic_children_info); 68 if (!children) 69 debug("%s: %s - no child found\n", __func__, dev->name); 70 71 /* Always return success for this device */ 72 return 0; 73 } 74 75 static struct dm_pmic_ops max77686_ops = { 76 .reg_count = max77686_reg_count, 77 .read = max77686_read, 78 .write = max77686_write, 79 }; 80 81 static const struct udevice_id max77686_ids[] = { 82 { .compatible = "maxim,max77686" }, 83 { } 84 }; 85 86 U_BOOT_DRIVER(pmic_max77686) = { 87 .name = "max77686 pmic", 88 .id = UCLASS_PMIC, 89 .of_match = max77686_ids, 90 .bind = max77686_bind, 91 .ops = &max77686_ops, 92 }; 93