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 <log.h>
13 #include <power/pmic.h>
14 #include <power/regulator.h>
15 #include <power/max77686_pmic.h>
16
17 static const struct pmic_child_info pmic_children_info[] = {
18 { .prefix = "LDO", .driver = MAX77686_LDO_DRIVER },
19 { .prefix = "BUCK", .driver = MAX77686_BUCK_DRIVER },
20 { },
21 };
22
max77686_reg_count(struct udevice * dev)23 static int max77686_reg_count(struct udevice *dev)
24 {
25 return MAX77686_NUM_OF_REGS;
26 }
27
max77686_write(struct udevice * dev,uint reg,const uint8_t * buff,int len)28 static int max77686_write(struct udevice *dev, uint reg, const uint8_t *buff,
29 int len)
30 {
31 if (dm_i2c_write(dev, reg, buff, len)) {
32 pr_err("write error to device: %p register: %#x!\n", dev, reg);
33 return -EIO;
34 }
35
36 return 0;
37 }
38
max77686_read(struct udevice * dev,uint reg,uint8_t * buff,int len)39 static int max77686_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
40 {
41 if (dm_i2c_read(dev, reg, buff, len)) {
42 pr_err("read error from device: %p register: %#x!\n", dev, reg);
43 return -EIO;
44 }
45
46 return 0;
47 }
48
max77686_bind(struct udevice * dev)49 static int max77686_bind(struct udevice *dev)
50 {
51 ofnode regulators_node;
52 int children;
53
54 regulators_node = dev_read_subnode(dev, "voltage-regulators");
55 if (!ofnode_valid(regulators_node)) {
56 debug("%s: %s regulators subnode not found!\n", __func__,
57 dev->name);
58 return -ENXIO;
59 }
60
61 debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
62
63 children = pmic_bind_children(dev, regulators_node, pmic_children_info);
64 if (!children)
65 debug("%s: %s - no child found\n", __func__, dev->name);
66
67 /* Always return success for this device */
68 return 0;
69 }
70
71 static struct dm_pmic_ops max77686_ops = {
72 .reg_count = max77686_reg_count,
73 .read = max77686_read,
74 .write = max77686_write,
75 };
76
77 static const struct udevice_id max77686_ids[] = {
78 { .compatible = "maxim,max77686" },
79 { }
80 };
81
82 U_BOOT_DRIVER(pmic_max77686) = {
83 .name = "max77686_pmic",
84 .id = UCLASS_PMIC,
85 .of_match = max77686_ids,
86 .bind = max77686_bind,
87 .ops = &max77686_ops,
88 };
89