1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2014 NVIDIA Corporation
4 */
5
6 #define pr_fmt(fmt) "as3722: " fmt
7
8 #include <common.h>
9 #include <dm.h>
10 #include <errno.h>
11 #include <fdtdec.h>
12 #include <i2c.h>
13 #include <log.h>
14 #include <dm/lists.h>
15 #include <power/as3722.h>
16 #include <power/pmic.h>
17
18 #define AS3722_NUM_OF_REGS 0x92
19
as3722_read(struct udevice * dev,uint reg,uint8_t * buff,int len)20 static int as3722_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
21 {
22 int ret;
23
24 ret = dm_i2c_read(dev, reg, buff, len);
25 if (ret < 0)
26 return ret;
27
28 return 0;
29 }
30
as3722_write(struct udevice * dev,uint reg,const uint8_t * buff,int len)31 static int as3722_write(struct udevice *dev, uint reg, const uint8_t *buff,
32 int len)
33 {
34 int ret;
35
36 ret = dm_i2c_write(dev, reg, buff, len);
37 if (ret < 0)
38 return ret;
39
40 return 0;
41 }
42
as3722_read_id(struct udevice * dev,uint * idp,uint * revisionp)43 static int as3722_read_id(struct udevice *dev, uint *idp, uint *revisionp)
44 {
45 int ret;
46
47 ret = pmic_reg_read(dev, AS3722_ASIC_ID1);
48 if (ret < 0) {
49 pr_err("failed to read ID1 register: %d\n", ret);
50 return ret;
51 }
52 *idp = ret;
53
54 ret = pmic_reg_read(dev, AS3722_ASIC_ID2);
55 if (ret < 0) {
56 pr_err("failed to read ID2 register: %d\n", ret);
57 return ret;
58 }
59 *revisionp = ret;
60
61 return 0;
62 }
63
64 /* TODO(treding@nvidia.com): Add proper regulator support to avoid this */
as3722_sd_set_voltage(struct udevice * dev,unsigned int sd,u8 value)65 int as3722_sd_set_voltage(struct udevice *dev, unsigned int sd, u8 value)
66 {
67 int ret;
68
69 if (sd > 6)
70 return -EINVAL;
71
72 ret = pmic_reg_write(dev, AS3722_SD_VOLTAGE(sd), value);
73 if (ret < 0) {
74 pr_err("failed to write SD%u voltage register: %d\n", sd, ret);
75 return ret;
76 }
77
78 return 0;
79 }
80
as3722_ldo_set_voltage(struct udevice * dev,unsigned int ldo,u8 value)81 int as3722_ldo_set_voltage(struct udevice *dev, unsigned int ldo, u8 value)
82 {
83 int ret;
84
85 if (ldo > 11)
86 return -EINVAL;
87
88 ret = pmic_reg_write(dev, AS3722_LDO_VOLTAGE(ldo), value);
89 if (ret < 0) {
90 pr_err("failed to write LDO%u voltage register: %d\n", ldo,
91 ret);
92 return ret;
93 }
94
95 return 0;
96 }
97
as3722_probe(struct udevice * dev)98 static int as3722_probe(struct udevice *dev)
99 {
100 uint id, revision;
101 int ret;
102
103 ret = as3722_read_id(dev, &id, &revision);
104 if (ret < 0) {
105 pr_err("failed to read ID: %d\n", ret);
106 return ret;
107 }
108
109 if (id != AS3722_DEVICE_ID) {
110 pr_err("unknown device\n");
111 return -ENOENT;
112 }
113
114 debug("AS3722 revision %#x found on I2C bus %s\n", revision, dev->name);
115
116 return 0;
117 }
118
119 #if CONFIG_IS_ENABLED(PMIC_CHILDREN)
120 static const struct pmic_child_info pmic_children_info[] = {
121 { .prefix = "sd", .driver = "as3722_stepdown"},
122 { .prefix = "ldo", .driver = "as3722_ldo"},
123 { },
124 };
125
as3722_bind(struct udevice * dev)126 static int as3722_bind(struct udevice *dev)
127 {
128 struct udevice *gpio_dev;
129 ofnode regulators_node;
130 int children;
131 int ret;
132
133 regulators_node = dev_read_subnode(dev, "regulators");
134 if (!ofnode_valid(regulators_node)) {
135 debug("%s: %s regulators subnode not found\n", __func__,
136 dev->name);
137 return -ENXIO;
138 }
139
140 children = pmic_bind_children(dev, regulators_node, pmic_children_info);
141 if (!children)
142 debug("%s: %s - no child found\n", __func__, dev->name);
143 ret = device_bind_driver(dev, "gpio_as3722", "gpio_as3722", &gpio_dev);
144 if (ret) {
145 debug("%s: Cannot bind GPIOs (ret=%d)\n", __func__, ret);
146 return ret;
147 }
148
149 return 0;
150 }
151 #endif
152
as3722_reg_count(struct udevice * dev)153 static int as3722_reg_count(struct udevice *dev)
154 {
155 return AS3722_NUM_OF_REGS;
156 }
157
158 static struct dm_pmic_ops as3722_ops = {
159 .reg_count = as3722_reg_count,
160 .read = as3722_read,
161 .write = as3722_write,
162 };
163
164 static const struct udevice_id as3722_ids[] = {
165 { .compatible = "ams,as3722" },
166 { }
167 };
168
169 U_BOOT_DRIVER(pmic_as3722) = {
170 .name = "as3722_pmic",
171 .id = UCLASS_PMIC,
172 .of_match = as3722_ids,
173 #if CONFIG_IS_ENABLED(PMIC_CHILDREN)
174 .bind = as3722_bind,
175 #endif
176 .probe = as3722_probe,
177 .ops = &as3722_ops,
178 };
179