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[u-boot] / drivers / power / pmic / rk808.c
1 /*
2  * Copyright (C) 2015 Google, Inc
3  * Written by Simon Glass <sjg@chromium.org>
4  *
5  * SPDX-License-Identifier:     GPL-2.0+
6  */
7
8 #include <common.h>
9 #include <dm.h>
10 #include <errno.h>
11 #include <fdtdec.h>
12 #include <libfdt.h>
13 #include <power/rk808_pmic.h>
14 #include <power/pmic.h>
15
16 DECLARE_GLOBAL_DATA_PTR;
17
18 static const struct pmic_child_info pmic_children_info[] = {
19         { .prefix = "DCDC_REG", .driver = "rk808_buck"},
20         { .prefix = "LDO_REG", .driver = "rk808_ldo"},
21         { .prefix = "SWITCH_REG", .driver = "rk808_switch"},
22         { },
23 };
24
25 static int rk808_reg_count(struct udevice *dev)
26 {
27         return RK808_NUM_OF_REGS;
28 }
29
30 static int rk808_write(struct udevice *dev, uint reg, const uint8_t *buff,
31                           int len)
32 {
33         if (dm_i2c_write(dev, reg, buff, len)) {
34                 debug("write error to device: %p register: %#x!", dev, reg);
35                 return -EIO;
36         }
37
38         return 0;
39 }
40
41 static int rk808_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
42 {
43         if (dm_i2c_read(dev, reg, buff, len)) {
44                 debug("read error from device: %p register: %#x!", dev, reg);
45                 return -EIO;
46         }
47
48         return 0;
49 }
50
51 #if CONFIG_IS_ENABLED(PMIC_CHILDREN)
52 static int rk808_bind(struct udevice *dev)
53 {
54         const void *blob = gd->fdt_blob;
55         int regulators_node;
56         int children;
57
58         regulators_node = fdt_subnode_offset(blob, dev->of_offset,
59                                              "regulators");
60         if (regulators_node <= 0) {
61                 debug("%s: %s regulators subnode not found!", __func__,
62                       dev->name);
63                 return -ENXIO;
64         }
65
66         debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
67
68         children = pmic_bind_children(dev, regulators_node, pmic_children_info);
69         if (!children)
70                 debug("%s: %s - no child found\n", __func__, dev->name);
71
72         /* Always return success for this device */
73         return 0;
74 }
75 #endif
76
77 static struct dm_pmic_ops rk808_ops = {
78         .reg_count = rk808_reg_count,
79         .read = rk808_read,
80         .write = rk808_write,
81 };
82
83 static const struct udevice_id rk808_ids[] = {
84         { .compatible = "rockchip,rk808" },
85         { }
86 };
87
88 U_BOOT_DRIVER(pmic_rk808) = {
89         .name = "rk808 pmic",
90         .id = UCLASS_PMIC,
91         .of_match = rk808_ids,
92 #if CONFIG_IS_ENABLED(PMIC_CHILDREN)
93         .bind = rk808_bind,
94 #endif
95         .ops = &rk808_ops,
96 };