1 /* 2 * Copyright (C) 2015 Google, Inc 3 * Written by Simon Glass <sjg@chromium.org> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <dm.h> 10 #include <errno.h> 11 #include <fdtdec.h> 12 #include <linux/libfdt.h> 13 #include <power/act8846_pmic.h> 14 #include <power/pmic.h> 15 16 static const struct pmic_child_info pmic_children_info[] = { 17 { .prefix = "REG", .driver = "act8846_reg"}, 18 { }, 19 }; 20 21 static int act8846_reg_count(struct udevice *dev) 22 { 23 return ACT8846_NUM_OF_REGS; 24 } 25 26 static int act8846_write(struct udevice *dev, uint reg, const uint8_t *buff, 27 int len) 28 { 29 if (dm_i2c_write(dev, reg, buff, len)) { 30 debug("write error to device: %p register: %#x!\n", dev, reg); 31 return -EIO; 32 } 33 34 return 0; 35 } 36 37 static int act8846_read(struct udevice *dev, uint reg, uint8_t *buff, int len) 38 { 39 if (dm_i2c_read(dev, reg, buff, len)) { 40 debug("read error from device: %p register: %#x!\n", dev, reg); 41 return -EIO; 42 } 43 44 return 0; 45 } 46 47 static int act8846_bind(struct udevice *dev) 48 { 49 ofnode regulators_node; 50 int children; 51 52 regulators_node = dev_read_subnode(dev, "regulators"); 53 if (!ofnode_valid(regulators_node)) { 54 debug("%s: %s regulators subnode not found!", __func__, 55 dev->name); 56 return -ENXIO; 57 } 58 59 debug("%s: '%s' - found regulators subnode\n", __func__, dev->name); 60 61 children = pmic_bind_children(dev, regulators_node, pmic_children_info); 62 if (!children) 63 debug("%s: %s - no child found\n", __func__, dev->name); 64 65 /* Always return success for this device */ 66 return 0; 67 } 68 69 static struct dm_pmic_ops act8846_ops = { 70 .reg_count = act8846_reg_count, 71 .read = act8846_read, 72 .write = act8846_write, 73 }; 74 75 static const struct udevice_id act8846_ids[] = { 76 { .compatible = "active-semi,act8846" }, 77 { } 78 }; 79 80 U_BOOT_DRIVER(pmic_act8846) = { 81 .name = "act8846 pmic", 82 .id = UCLASS_PMIC, 83 .of_match = act8846_ids, 84 .bind = act8846_bind, 85 .ops = &act8846_ops, 86 }; 87