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
act8846_reg_count(struct udevice * dev)20 static int act8846_reg_count(struct udevice *dev)
21 {
22 return ACT8846_NUM_OF_REGS;
23 }
24
act8846_write(struct udevice * dev,uint reg,const uint8_t * buff,int len)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
act8846_read(struct udevice * dev,uint reg,uint8_t * buff,int len)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
act8846_bind(struct udevice * dev)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!\n", __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