1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2015 Google, Inc
4 */
5
6 #include <fdtdec.h>
7 #include <errno.h>
8 #include <dm.h>
9 #include <i2c.h>
10 #include <log.h>
11 #include <linux/printk.h>
12 #include <power/pmic.h>
13 #include <power/regulator.h>
14 #include <power/s5m8767.h>
15
16 static const struct pmic_child_info pmic_children_info[] = {
17 { .prefix = "LDO", .driver = S5M8767_LDO_DRIVER },
18 { .prefix = "BUCK", .driver = S5M8767_BUCK_DRIVER },
19 { },
20 };
21
s5m8767_reg_count(struct udevice * dev)22 static int s5m8767_reg_count(struct udevice *dev)
23 {
24 return S5M8767_NUM_OF_REGS;
25 }
26
s5m8767_write(struct udevice * dev,uint reg,const uint8_t * buff,int len)27 static int s5m8767_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
s5m8767_read(struct udevice * dev,uint reg,uint8_t * buff,int len)38 static int s5m8767_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
s5m8767_enable_32khz_cp(struct udevice * dev)48 int s5m8767_enable_32khz_cp(struct udevice *dev)
49 {
50 return pmic_clrsetbits(dev, S5M8767_EN32KHZ_CP, 0, 1 << 1);
51 }
52
s5m8767_bind(struct udevice * dev)53 static int s5m8767_bind(struct udevice *dev)
54 {
55 int children;
56 ofnode node;
57
58 node = dev_read_subnode(dev, "regulators");
59 if (!ofnode_valid(node)) {
60 debug("%s: %s regulators subnode not found!\n", __func__,
61 dev->name);
62 return -ENXIO;
63 }
64
65 debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
66
67 children = pmic_bind_children(dev, node, pmic_children_info);
68 if (!children)
69 debug("%s: %s - no child found\n", __func__, dev->name);
70
71 /* Always return success for this device */
72 return 0;
73 }
74
75 static struct dm_pmic_ops s5m8767_ops = {
76 .reg_count = s5m8767_reg_count,
77 .read = s5m8767_read,
78 .write = s5m8767_write,
79 };
80
81 static const struct udevice_id s5m8767_ids[] = {
82 { .compatible = "samsung,s5m8767-pmic" },
83 { }
84 };
85
86 U_BOOT_DRIVER(pmic_s5m8767) = {
87 .name = "s5m8767_pmic",
88 .id = UCLASS_PMIC,
89 .of_match = s5m8767_ids,
90 .bind = s5m8767_bind,
91 .ops = &s5m8767_ops,
92 };
93