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