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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020 MediaTek Inc.
* Copyright (c) 2024 Collabora Ltd.
* AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/of_regulator.h>
#include <linux/soc/mediatek/dvfsrc.h>
enum dvfsrc_regulator_id {
DVFSRC_ID_VCORE,
DVFSRC_ID_VSCP,
DVFSRC_ID_MAX
};
struct dvfsrc_regulator_pdata {
const struct regulator_desc *descs;
u32 size;
};
#define MTK_DVFSRC_VREG(match, _name, _volt_table) \
{ \
.name = match, \
.of_match = match, \
.ops = &dvfsrc_vcore_ops, \
.type = REGULATOR_VOLTAGE, \
.id = DVFSRC_ID_##_name, \
.owner = THIS_MODULE, \
.n_voltages = ARRAY_SIZE(_volt_table), \
.volt_table = _volt_table, \
}
static inline struct device *to_dvfs_regulator_dev(struct regulator_dev *rdev)
{
return rdev_get_dev(rdev)->parent;
}
static inline struct device *to_dvfsrc_dev(struct regulator_dev *rdev)
{
return to_dvfs_regulator_dev(rdev)->parent;
}
static int dvfsrc_get_cmd(int rdev_id, enum mtk_dvfsrc_cmd *cmd)
{
switch (rdev_id) {
case DVFSRC_ID_VCORE:
*cmd = MTK_DVFSRC_CMD_VCORE_LEVEL;
break;
case DVFSRC_ID_VSCP:
*cmd = MTK_DVFSRC_CMD_VSCP_LEVEL;
break;
default:
return -EINVAL;
}
return 0;
}
static int dvfsrc_set_voltage_sel(struct regulator_dev *rdev,
unsigned int selector)
{
struct device *dvfsrc_dev = to_dvfsrc_dev(rdev);
enum mtk_dvfsrc_cmd req_cmd;
int id = rdev_get_id(rdev);
int ret;
ret = dvfsrc_get_cmd(id, &req_cmd);
if (ret)
return ret;
return mtk_dvfsrc_send_request(dvfsrc_dev, req_cmd, selector);
}
static int dvfsrc_get_voltage_sel(struct regulator_dev *rdev)
{
struct device *dvfsrc_dev = to_dvfsrc_dev(rdev);
enum mtk_dvfsrc_cmd query_cmd;
int id = rdev_get_id(rdev);
int val, ret;
ret = dvfsrc_get_cmd(id, &query_cmd);
if (ret)
return ret;
ret = mtk_dvfsrc_query_info(dvfsrc_dev, query_cmd, &val);
if (ret)
return ret;
return val;
}
static const struct regulator_ops dvfsrc_vcore_ops = {
.list_voltage = regulator_list_voltage_table,
.get_voltage_sel = dvfsrc_get_voltage_sel,
.set_voltage_sel = dvfsrc_set_voltage_sel,
};
static const unsigned int mt6873_voltages[] = {
575000,
600000,
650000,
725000,
};
static const struct regulator_desc mt6873_regulators[] = {
MTK_DVFSRC_VREG("dvfsrc-vcore", VCORE, mt6873_voltages),
MTK_DVFSRC_VREG("dvfsrc-vscp", VSCP, mt6873_voltages),
};
static const struct dvfsrc_regulator_pdata mt6873_data = {
.descs = mt6873_regulators,
.size = ARRAY_SIZE(mt6873_regulators),
};
static const unsigned int mt8183_voltages[] = {
725000,
800000,
};
static const struct regulator_desc mt8183_regulators[] = {
MTK_DVFSRC_VREG("dvfsrc-vcore", VCORE, mt8183_voltages),
};
static const struct dvfsrc_regulator_pdata mt8183_data = {
.descs = mt8183_regulators,
.size = ARRAY_SIZE(mt8183_regulators),
};
static const unsigned int mt8195_voltages[] = {
550000,
600000,
650000,
750000,
};
static const struct regulator_desc mt8195_regulators[] = {
MTK_DVFSRC_VREG("dvfsrc-vcore", VCORE, mt8195_voltages),
MTK_DVFSRC_VREG("dvfsrc-vscp", VSCP, mt8195_voltages),
};
static const struct dvfsrc_regulator_pdata mt8195_data = {
.descs = mt8195_regulators,
.size = ARRAY_SIZE(mt8195_regulators),
};
static int dvfsrc_vcore_regulator_probe(struct platform_device *pdev)
{
struct regulator_config config = { .dev = &pdev->dev };
const struct dvfsrc_regulator_pdata *pdata;
int i;
pdata = device_get_match_data(&pdev->dev);
if (!pdata)
return -EINVAL;
for (i = 0; i < pdata->size; i++) {
const struct regulator_desc *vrdesc = &pdata->descs[i];
struct regulator_dev *rdev;
rdev = devm_regulator_register(&pdev->dev, vrdesc, &config);
if (IS_ERR(rdev))
return dev_err_probe(&pdev->dev, PTR_ERR(rdev),
"failed to register %s\n", vrdesc->name);
}
return 0;
}
static const struct of_device_id mtk_dvfsrc_regulator_match[] = {
{ .compatible = "mediatek,mt6873-dvfsrc-regulator", .data = &mt6873_data },
{ .compatible = "mediatek,mt8183-dvfsrc-regulator", .data = &mt8183_data },
{ .compatible = "mediatek,mt8192-dvfsrc-regulator", .data = &mt6873_data },
{ .compatible = "mediatek,mt8195-dvfsrc-regulator", .data = &mt8195_data },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mtk_dvfsrc_regulator_match);
static struct platform_driver mtk_dvfsrc_regulator_driver = {
.driver = {
.name = "mtk-dvfsrc-regulator",
.of_match_table = mtk_dvfsrc_regulator_match,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.probe = dvfsrc_vcore_regulator_probe,
};
module_platform_driver(mtk_dvfsrc_regulator_driver);
MODULE_AUTHOR("AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>");
MODULE_AUTHOR("Arvin wang <arvin.wang@mediatek.com>");
MODULE_DESCRIPTION("MediaTek DVFS Resource Collector Regulator driver");
MODULE_LICENSE("GPL");
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