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 ofnode regulators_node; 54 int children; 55 56 regulators_node = dev_read_subnode(dev, "voltage-regulators"); 57 if (!ofnode_valid(regulators_node)) { 58 debug("%s: %s regulators subnode not found!", __func__, 59 dev->name); 60 return -ENXIO; 61 } 62 63 debug("%s: '%s' - found regulators subnode\n", __func__, dev->name); 64 65 children = pmic_bind_children(dev, regulators_node, pmic_children_info); 66 if (!children) 67 debug("%s: %s - no child found\n", __func__, dev->name); 68 69 /* Always return success for this device */ 70 return 0; 71 } 72 73 static struct dm_pmic_ops max77686_ops = { 74 .reg_count = max77686_reg_count, 75 .read = max77686_read, 76 .write = max77686_write, 77 }; 78 79 static const struct udevice_id max77686_ids[] = { 80 { .compatible = "maxim,max77686" }, 81 { } 82 }; 83 84 U_BOOT_DRIVER(pmic_max77686) = { 85 .name = "max77686_pmic", 86 .id = UCLASS_PMIC, 87 .of_match = max77686_ids, 88 .bind = max77686_bind, 89 .ops = &max77686_ops, 90 }; 91