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[u-boot] / drivers / power / pmic / palmas.c
1 /*
2  * (C) Copyright 2016 Texas Instruments Incorporated, <www.ti.com>
3  * Keerthy <j-keerthy@ti.com>
4  *
5  * SPDX-License-Identifier:     GPL-2.0+
6  */
7
8 #include <common.h>
9 #include <fdtdec.h>
10 #include <errno.h>
11 #include <dm.h>
12 #include <i2c.h>
13 #include <power/pmic.h>
14 #include <power/regulator.h>
15 #include <power/palmas.h>
16 #include <dm/device.h>
17
18 DECLARE_GLOBAL_DATA_PTR;
19
20 static const struct pmic_child_info pmic_children_info[] = {
21         { .prefix = "ldo", .driver = PALMAS_LDO_DRIVER },
22         { .prefix = "smps", .driver = PALMAS_SMPS_DRIVER },
23         { },
24 };
25
26 static int palmas_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!", dev, reg);
31                 return -EIO;
32         }
33
34         return 0;
35 }
36
37 static int palmas_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!", dev, reg);
41                 return -EIO;
42         }
43
44         return 0;
45 }
46
47 static int palmas_bind(struct udevice *dev)
48 {
49         ofnode pmic_node = ofnode_null(), regulators_node;
50         ofnode subnode;
51         int children;
52
53         dev_for_each_subnode(subnode, dev) {
54                 const char *name;
55                 char *temp;
56
57                 name = ofnode_get_name(subnode);
58                 temp = strstr(name, "pmic");
59                 if (temp) {
60                         pmic_node = subnode;
61                         break;
62                 }
63         }
64
65         if (!ofnode_valid(pmic_node)) {
66                 debug("%s: %s pmic subnode not found!", __func__, dev->name);
67                 return -ENXIO;
68         }
69
70         regulators_node = ofnode_find_subnode(pmic_node, "regulators");
71
72         if (!ofnode_valid(regulators_node)) {
73                 debug("%s: %s reg subnode not found!", __func__, dev->name);
74                 return -ENXIO;
75         }
76
77         children = pmic_bind_children(dev, regulators_node, pmic_children_info);
78         if (!children)
79                 debug("%s: %s - no child found\n", __func__, dev->name);
80
81         /* Always return success for this device */
82         return 0;
83 }
84
85 static struct dm_pmic_ops palmas_ops = {
86         .read = palmas_read,
87         .write = palmas_write,
88 };
89
90 static const struct udevice_id palmas_ids[] = {
91         { .compatible = "ti,tps659038", .data = TPS659038 },
92         { .compatible = "ti,tps65917" , .data = TPS65917 },
93         { }
94 };
95
96 U_BOOT_DRIVER(pmic_palmas) = {
97         .name = "palmas_pmic",
98         .id = UCLASS_PMIC,
99         .of_match = palmas_ids,
100         .bind = palmas_bind,
101         .ops = &palmas_ops,
102 };