[PATCH V5 15/17] regulator: Regulator driver for the Mediatek DVFSRC

Henry Chen
2020-09-14T03:12:37Z

From: "henryc.chen" <henryc.chen@mediatek.com>

Driver for regulators exposed by the DVFSRC (dynamic voltage and
frequency scaling resource collector) found in devices based on
mt8183 and newer platforms.

Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
---
drivers/regulator/Kconfig | 10 ++
drivers/regulator/Makefile | 1 +
drivers/regulator/mtk-dvfsrc-regulator.c | 224 +++++++++++++++++++++++++++++++
3 files changed, 235 insertions(+)
create mode 100644 drivers/regulator/mtk-dvfsrc-regulator.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index de17ef7..dd3b04f 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -729,6 +729,16 @@ config REGULATOR_MT6397
This driver supports the control of different power rails of device
through regulator interface.

+config REGULATOR_MTK_DVFSRC
+ tristate "MediaTek DVFSRC regulator driver"
+ depends on MTK_DVFSRC
+ help
+ Say y here to control regulator by DVFSRC (dynamic voltage
+ and frequency scaling resource collector).
+ This driver supports to control regulators via the DVFSRC
+ of Mediatek. It allows for voting on regulator state
+ between multiple users.
+
config REGULATOR_PALMAS
tristate "TI Palmas PMIC Regulators"
depends on MFD_PALMAS
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index d8d3ecf..de858f2 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -90,6 +90,7 @@ obj-$(CONFIG_REGULATOR_MT6323) += mt6323-regulator.o
obj-$(CONFIG_REGULATOR_MT6358) += mt6358-regulator.o
obj-$(CONFIG_REGULATOR_MT6380) += mt6380-regulator.o
obj-$(CONFIG_REGULATOR_MT6397) += mt6397-regulator.o
+obj-$(CONFIG_REGULATOR_MTK_DVFSRC) += mtk-dvfsrc-regulator.o
obj-$(CONFIG_REGULATOR_QCOM_LABIBB) += qcom-labibb-regulator.o
obj-$(CONFIG_REGULATOR_QCOM_RPM) += qcom_rpm-regulator.o
obj-$(CONFIG_REGULATOR_QCOM_RPMH) += qcom-rpmh-regulator.o
diff --git a/drivers/regulator/mtk-dvfsrc-regulator.c b/drivers/regulator/mtk-dvfsrc-regulator.c
new file mode 100644
index 0000000..041583e
--- /dev/null
+++ b/drivers/regulator/mtk-dvfsrc-regulator.c
@@ -0,0 +1,224 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 MediaTek Inc.
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of_device.h>
+#include <linux/of_platform.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/soc/mediatek/mtk_dvfsrc.h>
+
+#define DVFSRC_ID_VCORE 0
+#define DVFSRC_ID_VSCP 1
+
+#define MT_DVFSRC_REGULAR(match, _name, _volt_table) \
+[DVFSRC_ID_##_name] = { \
+ .desc = { \
+ .name = match, \
+ .of_match = of_match_ptr(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, \
+ }, \
+}
+
+/*
+ * DVFSRC regulators' information
+ *
+ * @desc: standard fields of regulator description.
+ * @voltage_selector: Selector used for get_voltage_sel() and
+ * set_voltage_sel() callbacks
+ */
+
+struct dvfsrc_regulator {
+ struct regulator_desc desc;
+};
+
+/*
+ * MTK DVFSRC regulators' init data
+ *
+ * @size: num of regulators
+ * @regulator_info: regulator info.
+ */
+struct dvfsrc_regulator_init_data {
+ u32 size;
+ struct dvfsrc_regulator *regulator_info;
+};
+
+static inline struct device *to_dvfsrc_dev(struct regulator_dev *rdev)
+{
+ return rdev_get_dev(rdev)->parent;
+}
+
+static int dvfsrc_set_voltage_sel(struct regulator_dev *rdev,
+ unsigned int selector)
+{
+ struct device *dvfsrc_dev = to_dvfsrc_dev(rdev);
+ int id = rdev_get_id(rdev);
+
+ switch (id) {
+ case DVFSRC_ID_VCORE:
+ mtk_dvfsrc_send_request(dvfsrc_dev,
+ MTK_DVFSRC_CMD_VCORE_REQUEST,
+ selector);
+ break;
+ case DVFSRC_ID_VSCP:
+ mtk_dvfsrc_send_request(dvfsrc_dev,
+ MTK_DVFSRC_CMD_VSCP_REQUEST,
+ selector);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int dvfsrc_get_voltage_sel(struct regulator_dev *rdev)
+{
+ struct device *dvfsrc_dev = to_dvfsrc_dev(rdev);
+ int id = rdev_get_id(rdev);
+ int val, ret;
+
+ switch (id) {
+ case DVFSRC_ID_VCORE:
+ ret = mtk_dvfsrc_query_info(dvfsrc_dev,
+ MTK_DVFSRC_CMD_VCORE_LEVEL_QUERY,
+ &val);
+ break;
+ case DVFSRC_ID_VSCP:
+ ret = mtk_dvfsrc_query_info(dvfsrc_dev,
+ MTK_DVFSRC_CMD_VSCP_LEVEL_QUERY,
+ &val);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (ret != 0)
+ 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 mt8183_voltages[] = {
+ 725000,
+ 800000,
+};
+
+static struct dvfsrc_regulator mt8183_regulators[] = {
+ MT_DVFSRC_REGULAR("dvfsrc-vcore", VCORE,
+ mt8183_voltages),
+};
+
+static const struct dvfsrc_regulator_init_data regulator_mt8183_data = {
+ .size = ARRAY_SIZE(mt8183_regulators),
+ .regulator_info = &mt8183_regulators[0],
+};
+
+static const unsigned int mt6873_voltages[] = {
+ 575000,
+ 600000,
+ 650000,
+ 725000,
+};
+
+static struct dvfsrc_regulator mt6873_regulators[] = {
+ MT_DVFSRC_REGULAR("dvfsrc-vcore", VCORE,
+ mt6873_voltages),
+ MT_DVFSRC_REGULAR("dvfsrc-vscp", VSCP,
+ mt6873_voltages),
+};
+
+static const struct dvfsrc_regulator_init_data regulator_mt6873_data = {
+ .size = ARRAY_SIZE(mt6873_regulators),
+ .regulator_info = &mt6873_regulators[0],
+};
+
+static const struct of_device_id mtk_dvfsrc_regulator_match[] = {
+ {
+ .compatible = "mediatek,mt8183-dvfsrc",
+ .data = &regulator_mt8183_data,
+ }, {
+ .compatible = "mediatek,mt8192-dvfsrc",
+ .data = &regulator_mt6873_data,
+ }, {
+ .compatible = "mediatek,mt6873-dvfsrc",
+ .data = &regulator_mt6873_data,
+ }, {
+ /* sentinel */
+ },
+};
+MODULE_DEVICE_TABLE(of, mtk_dvfsrc_regulator_match);
+
+static int dvfsrc_vcore_regulator_probe(struct platform_device *pdev)
+{
+ const struct of_device_id *match;
+ struct device *dev = &pdev->dev;
+ struct regulator_config config = { };
+ struct regulator_dev *rdev;
+ const struct dvfsrc_regulator_init_data *regulator_init_data;
+ struct dvfsrc_regulator *mt_regulators;
+ int i;
+
+ match = of_match_node(mtk_dvfsrc_regulator_match, dev->parent->of_node);
+
+ if (!match) {
+ dev_err(dev, "invalid compatible string\n");
+ return -ENODEV;
+ }
+
+ regulator_init_data = match->data;
+
+ mt_regulators = regulator_init_data->regulator_info;
+ for (i = 0; i < regulator_init_data->size; i++) {
+ config.dev = dev->parent;
+ config.driver_data = (mt_regulators + i);
+ rdev = devm_regulator_register(dev->parent,
+ &(mt_regulators + i)->desc,
+ &config);
+ if (IS_ERR(rdev)) {
+ dev_err(dev, "failed to register %s\n",
+ (mt_regulators + i)->desc.name);
+ return PTR_ERR(rdev);
+ }
+ }
+
+ return 0;
+}
+
+static struct platform_driver mtk_dvfsrc_regulator_driver = {
+ .driver = {
+ .name = "mtk-dvfsrc-regulator",
+ },
+ .probe = dvfsrc_vcore_regulator_probe,
+};
+
+static int __init mtk_dvfsrc_regulator_init(void)
+{
+ return platform_driver_register(&mtk_dvfsrc_regulator_driver);
+}
+subsys_initcall(mtk_dvfsrc_regulator_init);
+
+static void __exit mtk_dvfsrc_regulator_exit(void)
+{
+ platform_driver_unregister(&mtk_dvfsrc_regulator_driver);
+}
+module_exit(mtk_dvfsrc_regulator_exit);
+
+MODULE_AUTHOR("Arvin wang <arvin.wang@mediatek.com>");
+MODULE_LICENSE("GPL v2");