1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2014-2015 Samsung Electronics 4 * Przemyslaw Marczak <p.marczak@samsung.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 <power/pmic.h> 13 #include <power/regulator.h> 14 #include <power/max77686_pmic.h> 15 16 static const struct pmic_child_info pmic_children_info[] = { 17 { .prefix = "LDO", .driver = MAX77686_LDO_DRIVER }, 18 { .prefix = "BUCK", .driver = MAX77686_BUCK_DRIVER }, 19 { }, 20 }; 21 22 static int max77686_reg_count(struct udevice *dev) 23 { 24 return MAX77686_NUM_OF_REGS; 25 } 26 27 static int max77686_write(struct udevice *dev, uint reg, const uint8_t *buff, 28 int len) 29 { 30 if (dm_i2c_write(dev, reg, buff, len)) { 31 pr_err("write error to device: %p register: %#x!", dev, reg); 32 return -EIO; 33 } 34 35 return 0; 36 } 37 38 static int max77686_read(struct udevice *dev, uint reg, uint8_t *buff, int len) 39 { 40 if (dm_i2c_read(dev, reg, buff, len)) { 41 pr_err("read error from device: %p register: %#x!", dev, reg); 42 return -EIO; 43 } 44 45 return 0; 46 } 47 48 static int max77686_bind(struct udevice *dev) 49 { 50 ofnode regulators_node; 51 int children; 52 53 regulators_node = dev_read_subnode(dev, "voltage-regulators"); 54 if (!ofnode_valid(regulators_node)) { 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 children = pmic_bind_children(dev, regulators_node, pmic_children_info); 63 if (!children) 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_reg_count, 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