tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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(id, &req_cmd);
73 if (ret)
74 return ret;
75
76 return mtk_dvfsrc_send_request(dvfsrc_dev, req_cmd, 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(id, &query_cmd);
87 if (ret)
88 return ret;
89
90 ret = mtk_dvfsrc_query_info(dvfsrc_dev, query_cmd, &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 mt8183_voltages[] = {
121 725000,
122 800000,
123};
124
125static const struct regulator_desc mt8183_regulators[] = {
126 MTK_DVFSRC_VREG("dvfsrc-vcore", VCORE, mt8183_voltages),
127};
128
129static const struct dvfsrc_regulator_pdata mt8183_data = {
130 .descs = mt8183_regulators,
131 .size = ARRAY_SIZE(mt8183_regulators),
132};
133
134static const unsigned int mt8195_voltages[] = {
135 550000,
136 600000,
137 650000,
138 750000,
139};
140
141static const struct regulator_desc mt8195_regulators[] = {
142 MTK_DVFSRC_VREG("dvfsrc-vcore", VCORE, mt8195_voltages),
143 MTK_DVFSRC_VREG("dvfsrc-vscp", VSCP, mt8195_voltages),
144};
145
146static const struct dvfsrc_regulator_pdata mt8195_data = {
147 .descs = mt8195_regulators,
148 .size = ARRAY_SIZE(mt8195_regulators),
149};
150
151static int dvfsrc_vcore_regulator_probe(struct platform_device *pdev)
152{
153 struct regulator_config config = { .dev = &pdev->dev };
154 const struct dvfsrc_regulator_pdata *pdata;
155 int i;
156
157 pdata = device_get_match_data(&pdev->dev);
158 if (!pdata)
159 return -EINVAL;
160
161 for (i = 0; i < pdata->size; i++) {
162 const struct regulator_desc *vrdesc = &pdata->descs[i];
163 struct regulator_dev *rdev;
164
165 rdev = devm_regulator_register(&pdev->dev, vrdesc, &config);
166 if (IS_ERR(rdev))
167 return dev_err_probe(&pdev->dev, PTR_ERR(rdev),
168 "failed to register %s\n", vrdesc->name);
169 }
170
171 return 0;
172}
173
174static const struct of_device_id mtk_dvfsrc_regulator_match[] = {
175 { .compatible = "mediatek,mt6873-dvfsrc-regulator", .data = &mt6873_data },
176 { .compatible = "mediatek,mt8183-dvfsrc-regulator", .data = &mt8183_data },
177 { .compatible = "mediatek,mt8192-dvfsrc-regulator", .data = &mt6873_data },
178 { .compatible = "mediatek,mt8195-dvfsrc-regulator", .data = &mt8195_data },
179 { /* sentinel */ }
180};
181MODULE_DEVICE_TABLE(of, mtk_dvfsrc_regulator_match);
182
183static struct platform_driver mtk_dvfsrc_regulator_driver = {
184 .driver = {
185 .name = "mtk-dvfsrc-regulator",
186 .of_match_table = mtk_dvfsrc_regulator_match,
187 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
188 },
189 .probe = dvfsrc_vcore_regulator_probe,
190};
191module_platform_driver(mtk_dvfsrc_regulator_driver);
192
193MODULE_AUTHOR("AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>");
194MODULE_AUTHOR("Arvin wang <arvin.wang@mediatek.com>");
195MODULE_DESCRIPTION("MediaTek DVFS Resource Collector Regulator driver");
196MODULE_LICENSE("GPL");