1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2015 Google, Inc
4 */
5
6 #include <common.h>
7 #include <fdtdec.h>
8 #include <errno.h>
9 #include <dm.h>
10 #include <i2c.h>
11 #include <power/pmic.h>
12 #include <power/regulator.h>
13 #include <power/s5m8767.h>
14
15 static const struct pmic_child_info pmic_children_info[] = {
16 { .prefix = "LDO", .driver = S5M8767_LDO_DRIVER },
17 { .prefix = "BUCK", .driver = S5M8767_BUCK_DRIVER },
18 { },
19 };
20
s5m8767_reg_count(struct udevice * dev)21 static int s5m8767_reg_count(struct udevice *dev)
22 {
23 return S5M8767_NUM_OF_REGS;
24 }
25
s5m8767_write(struct udevice * dev,uint reg,const uint8_t * buff,int len)26 static int s5m8767_write(struct udevice *dev, uint reg, const uint8_t *buff,
27 int len)
28 {
29 if (dm_i2c_write(dev, reg, buff, len)) {
30 pr_err("write error to device: %p register: %#x!\n", dev, reg);
31 return -EIO;
32 }
33
34 return 0;
35 }
36
s5m8767_read(struct udevice * dev,uint reg,uint8_t * buff,int len)37 static int s5m8767_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
38 {
39 if (dm_i2c_read(dev, reg, buff, len)) {
40 pr_err("read error from device: %p register: %#x!\n", dev, reg);
41 return -EIO;
42 }
43
44 return 0;
45 }
46
s5m8767_enable_32khz_cp(struct udevice * dev)47 int s5m8767_enable_32khz_cp(struct udevice *dev)
48 {
49 return pmic_clrsetbits(dev, S5M8767_EN32KHZ_CP, 0, 1 << 1);
50 }
51
s5m8767_bind(struct udevice * dev)52 static int s5m8767_bind(struct udevice *dev)
53 {
54 int children;
55 ofnode node;
56
57 node = dev_read_subnode(dev, "regulators");
58 if (!ofnode_valid(node)) {
59 debug("%s: %s regulators subnode not found!\n", __func__,
60 dev->name);
61 return -ENXIO;
62 }
63
64 debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
65
66 children = pmic_bind_children(dev, node, pmic_children_info);
67 if (!children)
68 debug("%s: %s - no child found\n", __func__, dev->name);
69
70 /* Always return success for this device */
71 return 0;
72 }
73
74 static struct dm_pmic_ops s5m8767_ops = {
75 .reg_count = s5m8767_reg_count,
76 .read = s5m8767_read,
77 .write = s5m8767_write,
78 };
79
80 static const struct udevice_id s5m8767_ids[] = {
81 { .compatible = "samsung,s5m8767-pmic" },
82 { }
83 };
84
85 U_BOOT_DRIVER(pmic_s5m8767) = {
86 .name = "s5m8767_pmic",
87 .id = UCLASS_PMIC,
88 .of_match = s5m8767_ids,
89 .bind = s5m8767_bind,
90 .ops = &s5m8767_ops,
91 };
92