1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2020 MediaTek Inc.
4 * Copyright (c) 2024 Collabora Ltd.
5 * AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
6 */
7
8#include <linux/module.h>
9#include <linux/platform_device.h>
10#include <linux/of.h>
11#include <linux/regulator/driver.h>
12#include <linux/regulator/of_regulator.h>
13#include <linux/soc/mediatek/dvfsrc.h>
14
15enum dvfsrc_regulator_id {
16 DVFSRC_ID_VCORE,
17 DVFSRC_ID_VSCP,
18 DVFSRC_ID_MAX
19};
20
21struct dvfsrc_regulator_pdata {
22 const struct regulator_desc *descs;
23 u32 size;
24};
25
26#define MTK_DVFSRC_VREG(match, _name, _volt_table) \
27{ \
28 .name = match, \
29 .of_match = match, \
30 .ops = &dvfsrc_vcore_ops, \
31 .type = REGULATOR_VOLTAGE, \
32 .id = DVFSRC_ID_##_name, \
33 .owner = THIS_MODULE, \
34 .n_voltages = ARRAY_SIZE(_volt_table), \
35 .volt_table = _volt_table, \
36}
37
38static inline struct device *to_dvfs_regulator_dev(struct regulator_dev *rdev)
39{
40 return rdev_get_dev(rdev)->parent;
41}
42
43static inline struct device *to_dvfsrc_dev(struct regulator_dev *rdev)
44{
45 return to_dvfs_regulator_dev(rdev)->parent;
46}
47
48static int dvfsrc_get_cmd(int rdev_id, enum mtk_dvfsrc_cmd *cmd)
49{
50 switch (rdev_id) {
51 case DVFSRC_ID_VCORE:
52 *cmd = MTK_DVFSRC_CMD_VCORE_LEVEL;
53 break;
54 case DVFSRC_ID_VSCP:
55 *cmd = MTK_DVFSRC_CMD_VSCP_LEVEL;
56 break;
57 default:
58 return -EINVAL;
59 }
60
61 return 0;
62}
63
64static int dvfsrc_set_voltage_sel(struct regulator_dev *rdev,
65 unsigned int selector)
66{
67 struct device *dvfsrc_dev = to_dvfsrc_dev(rdev);
68 enum mtk_dvfsrc_cmd req_cmd;
69 int id = rdev_get_id(rdev);
70 int ret;
71
72 ret = dvfsrc_get_cmd(rdev_id: id, cmd: &req_cmd);
73 if (ret)
74 return ret;
75
76 return mtk_dvfsrc_send_request(dev: dvfsrc_dev, cmd: req_cmd, data: selector);
77}
78
79static int dvfsrc_get_voltage_sel(struct regulator_dev *rdev)
80{
81 struct device *dvfsrc_dev = to_dvfsrc_dev(rdev);
82 enum mtk_dvfsrc_cmd query_cmd;
83 int id = rdev_get_id(rdev);
84 int val, ret;
85
86 ret = dvfsrc_get_cmd(rdev_id: id, cmd: &query_cmd);
87 if (ret)
88 return ret;
89
90 ret = mtk_dvfsrc_query_info(dev: dvfsrc_dev, cmd: query_cmd, data: &val);
91 if (ret)
92 return ret;
93
94 return val;
95}
96
97static const struct regulator_ops dvfsrc_vcore_ops = {
98 .list_voltage = regulator_list_voltage_table,
99 .get_voltage_sel = dvfsrc_get_voltage_sel,
100 .set_voltage_sel = dvfsrc_set_voltage_sel,
101};
102
103static const unsigned int mt6873_voltages[] = {
104 575000,
105 600000,
106 650000,
107 725000,
108};
109
110static const struct regulator_desc mt6873_regulators[] = {
111 MTK_DVFSRC_VREG("dvfsrc-vcore", VCORE, mt6873_voltages),
112 MTK_DVFSRC_VREG("dvfsrc-vscp", VSCP, mt6873_voltages),
113};
114
115static const struct dvfsrc_regulator_pdata mt6873_data = {
116 .descs = mt6873_regulators,
117 .size = ARRAY_SIZE(mt6873_regulators),
118};
119
120static const unsigned int mt6893_voltages[] = {
121 575000,
122 600000,
123 650000,
124 725000,
125 750000,
126};
127
128static const struct regulator_desc mt6893_regulators[] = {
129 MTK_DVFSRC_VREG("dvfsrc-vcore", VCORE, mt6893_voltages),
130 MTK_DVFSRC_VREG("dvfsrc-vscp", VSCP, mt6893_voltages),
131};
132
133static const struct dvfsrc_regulator_pdata mt6893_data = {
134 .descs = mt6893_regulators,
135 .size = ARRAY_SIZE(mt6893_regulators),
136};
137
138static const unsigned int mt8183_voltages[] = {
139 725000,
140 800000,
141};
142
143static const struct regulator_desc mt8183_regulators[] = {
144 MTK_DVFSRC_VREG("dvfsrc-vcore", VCORE, mt8183_voltages),
145};
146
147static const struct dvfsrc_regulator_pdata mt8183_data = {
148 .descs = mt8183_regulators,
149 .size = ARRAY_SIZE(mt8183_regulators),
150};
151
152static const unsigned int mt8195_voltages[] = {
153 550000,
154 600000,
155 650000,
156 750000,
157};
158
159static const struct regulator_desc mt8195_regulators[] = {
160 MTK_DVFSRC_VREG("dvfsrc-vcore", VCORE, mt8195_voltages),
161 MTK_DVFSRC_VREG("dvfsrc-vscp", VSCP, mt8195_voltages),
162};
163
164static const struct dvfsrc_regulator_pdata mt8195_data = {
165 .descs = mt8195_regulators,
166 .size = ARRAY_SIZE(mt8195_regulators),
167};
168
169static const unsigned int mt8196_voltages[] = {
170 575000,
171 600000,
172 650000,
173 725000,
174 825000,
175 875000,
176};
177
178static const struct regulator_desc mt8196_regulators[] = {
179 MTK_DVFSRC_VREG("dvfsrc-vcore", VCORE, mt8196_voltages),
180};
181
182static const struct dvfsrc_regulator_pdata mt8196_data = {
183 .descs = mt8196_regulators,
184 .size = ARRAY_SIZE(mt8196_regulators),
185};
186
187static int dvfsrc_vcore_regulator_probe(struct platform_device *pdev)
188{
189 struct regulator_config config = { .dev = &pdev->dev };
190 const struct dvfsrc_regulator_pdata *pdata;
191 int i;
192
193 pdata = device_get_match_data(dev: &pdev->dev);
194 if (!pdata)
195 return -EINVAL;
196
197 for (i = 0; i < pdata->size; i++) {
198 const struct regulator_desc *vrdesc = &pdata->descs[i];
199 struct regulator_dev *rdev;
200
201 rdev = devm_regulator_register(dev: &pdev->dev, regulator_desc: vrdesc, config: &config);
202 if (IS_ERR(ptr: rdev))
203 return dev_err_probe(dev: &pdev->dev, err: PTR_ERR(ptr: rdev),
204 fmt: "failed to register %s\n", vrdesc->name);
205 }
206
207 return 0;
208}
209
210static const struct of_device_id mtk_dvfsrc_regulator_match[] = {
211 { .compatible = "mediatek,mt6873-dvfsrc-regulator", .data = &mt6873_data },
212 { .compatible = "mediatek,mt6893-dvfsrc-regulator", .data = &mt6893_data },
213 { .compatible = "mediatek,mt8183-dvfsrc-regulator", .data = &mt8183_data },
214 { .compatible = "mediatek,mt8192-dvfsrc-regulator", .data = &mt6873_data },
215 { .compatible = "mediatek,mt8195-dvfsrc-regulator", .data = &mt8195_data },
216 { .compatible = "mediatek,mt8196-dvfsrc-regulator", .data = &mt8196_data },
217 { /* sentinel */ }
218};
219MODULE_DEVICE_TABLE(of, mtk_dvfsrc_regulator_match);
220
221static struct platform_driver mtk_dvfsrc_regulator_driver = {
222 .driver = {
223 .name = "mtk-dvfsrc-regulator",
224 .of_match_table = mtk_dvfsrc_regulator_match,
225 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
226 },
227 .probe = dvfsrc_vcore_regulator_probe,
228};
229module_platform_driver(mtk_dvfsrc_regulator_driver);
230
231MODULE_AUTHOR("AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>");
232MODULE_AUTHOR("Arvin wang <arvin.wang@mediatek.com>");
233MODULE_DESCRIPTION("MediaTek DVFS Resource Collector Regulator driver");
234MODULE_LICENSE("GPL");
235

source code of linux/drivers/regulator/mtk-dvfsrc-regulator.c