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 static const struct pmic_child_info pmic_children_info[] = { 18 { .prefix = "LDO", .driver = MAX77686_LDO_DRIVER }, 19 { .prefix = "BUCK", .driver = MAX77686_BUCK_DRIVER }, 20 { }, 21 }; 22 23 static int max77686_reg_count(struct udevice *dev) 24 { 25 return MAX77686_NUM_OF_REGS; 26 } 27 28 static int max77686_write(struct udevice *dev, uint reg, const uint8_t *buff, 29 int len) 30 { 31 if (dm_i2c_write(dev, reg, buff, len)) { 32 pr_err("write error to device: %p register: %#x!", dev, reg); 33 return -EIO; 34 } 35 36 return 0; 37 } 38 39 static int max77686_read(struct udevice *dev, uint reg, uint8_t *buff, int len) 40 { 41 if (dm_i2c_read(dev, reg, buff, len)) { 42 pr_err("read error from device: %p register: %#x!", dev, reg); 43 return -EIO; 44 } 45 46 return 0; 47 } 48 49 static int max77686_bind(struct udevice *dev) 50 { 51 ofnode regulators_node; 52 int children; 53 54 regulators_node = dev_read_subnode(dev, "voltage-regulators"); 55 if (!ofnode_valid(regulators_node)) { 56 debug("%s: %s regulators subnode not found!", __func__, 57 dev->name); 58 return -ENXIO; 59 } 60 61 debug("%s: '%s' - found regulators subnode\n", __func__, dev->name); 62 63 children = pmic_bind_children(dev, regulators_node, pmic_children_info); 64 if (!children) 65 debug("%s: %s - no child found\n", __func__, dev->name); 66 67 /* Always return success for this device */ 68 return 0; 69 } 70 71 static struct dm_pmic_ops max77686_ops = { 72 .reg_count = max77686_reg_count, 73 .read = max77686_read, 74 .write = max77686_write, 75 }; 76 77 static const struct udevice_id max77686_ids[] = { 78 { .compatible = "maxim,max77686" }, 79 { } 80 }; 81 82 U_BOOT_DRIVER(pmic_max77686) = { 83 .name = "max77686_pmic", 84 .id = UCLASS_PMIC, 85 .of_match = max77686_ids, 86 .bind = max77686_bind, 87 .ops = &max77686_ops, 88 }; 89