1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2015 Google, Inc 4 * Written by Simon Glass <sjg@chromium.org> 5 */ 6 7 #include <common.h> 8 #include <dm.h> 9 #include <errno.h> 10 #include <fdtdec.h> 11 #include <linux/libfdt.h> 12 #include <power/act8846_pmic.h> 13 #include <power/pmic.h> 14 15 static const struct pmic_child_info pmic_children_info[] = { 16 { .prefix = "REG", .driver = "act8846_reg"}, 17 { }, 18 }; 19 20 static int act8846_reg_count(struct udevice *dev) 21 { 22 return ACT8846_NUM_OF_REGS; 23 } 24 25 static int act8846_write(struct udevice *dev, uint reg, const uint8_t *buff, 26 int len) 27 { 28 if (dm_i2c_write(dev, reg, buff, len)) { 29 debug("write error to device: %p register: %#x!\n", dev, reg); 30 return -EIO; 31 } 32 33 return 0; 34 } 35 36 static int act8846_read(struct udevice *dev, uint reg, uint8_t *buff, int len) 37 { 38 if (dm_i2c_read(dev, reg, buff, len)) { 39 debug("read error from device: %p register: %#x!\n", dev, reg); 40 return -EIO; 41 } 42 43 return 0; 44 } 45 46 static int act8846_bind(struct udevice *dev) 47 { 48 ofnode regulators_node; 49 int children; 50 51 regulators_node = dev_read_subnode(dev, "regulators"); 52 if (!ofnode_valid(regulators_node)) { 53 debug("%s: %s regulators subnode not found!", __func__, 54 dev->name); 55 return -ENXIO; 56 } 57 58 debug("%s: '%s' - found regulators subnode\n", __func__, dev->name); 59 60 children = pmic_bind_children(dev, regulators_node, pmic_children_info); 61 if (!children) 62 debug("%s: %s - no child found\n", __func__, dev->name); 63 64 /* Always return success for this device */ 65 return 0; 66 } 67 68 static struct dm_pmic_ops act8846_ops = { 69 .reg_count = act8846_reg_count, 70 .read = act8846_read, 71 .write = act8846_write, 72 }; 73 74 static const struct udevice_id act8846_ids[] = { 75 { .compatible = "active-semi,act8846" }, 76 { } 77 }; 78 79 U_BOOT_DRIVER(pmic_act8846) = { 80 .name = "act8846 pmic", 81 .id = UCLASS_PMIC, 82 .of_match = act8846_ids, 83 .bind = act8846_bind, 84 .ops = &act8846_ops, 85 }; 86