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