[PATCH v2 3/3] regulator: mt6315: Add support for MT6315 regulator

Hsin-Hsiung Wang
2020-10-20T09:57:47Z

The MT6315 is a regulator found on boards based on MediaTek MT8192 and
probably other SoCs. It connects as a slave to SoC using SPMI.

Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>
---
drivers/regulator/Kconfig | 10 +
drivers/regulator/Makefile | 1 +
drivers/regulator/mt6315-regulator.c | 364 +++++++++++++++++++++
include/linux/regulator/mt6315-regulator.h | 37 +++
4 files changed, 412 insertions(+)
create mode 100644 drivers/regulator/mt6315-regulator.c
create mode 100644 include/linux/regulator/mt6315-regulator.h

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index de17ef7e18f0..59544918034e 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -693,6 +693,16 @@ config REGULATOR_MT6311
This driver supports the control of different power rails of device
through regulator interface.

+config REGULATOR_MT6315
+ tristate "MediaTek MT6315 PMIC"
+ depends on SPMI
+ select REGMAP_SPMI
+ help
+ Say y here to select this option to enable the power regulator of
+ MediaTek MT6315 PMIC.
+ This driver supports the control of different power rails of device
+ through regulator interface.
+
config REGULATOR_MT6323
tristate "MediaTek MT6323 PMIC"
depends on MFD_MT6397
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index d8d3ecf526a8..5488e563c60a 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -86,6 +86,7 @@ obj-$(CONFIG_REGULATOR_MP8859) += mp8859.o
obj-$(CONFIG_REGULATOR_MP886X) += mp886x.o
obj-$(CONFIG_REGULATOR_MPQ7920) += mpq7920.o
obj-$(CONFIG_REGULATOR_MT6311) += mt6311-regulator.o
+obj-$(CONFIG_REGULATOR_MT6315) += mt6315-regulator.o
obj-$(CONFIG_REGULATOR_MT6323) += mt6323-regulator.o
obj-$(CONFIG_REGULATOR_MT6358) += mt6358-regulator.o
obj-$(CONFIG_REGULATOR_MT6380) += mt6380-regulator.o
diff --git a/drivers/regulator/mt6315-regulator.c b/drivers/regulator/mt6315-regulator.c
new file mode 100644
index 000000000000..8e3accb2e36f
--- /dev/null
+++ b/drivers/regulator/mt6315-regulator.c
@@ -0,0 +1,364 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2020 MediaTek Inc.
+
+#include <dt-bindings/regulator/mtk,mt6315.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/mt6315-regulator.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/spmi.h>
+
+#define MT6315_REG_WIDTH 8
+
+#define MT6315_BUCK_MODE_AUTO 0
+#define MT6315_BUCK_MODE_FORCE_PWM 1
+#define MT6315_BUCK_MODE_LP 2
+
+struct mt6315_regulator_info {
+ struct regulator_desc desc;
+ u32 da_vsel_reg;
+ u32 da_reg;
+ u32 lp_mode_reg;
+ u32 lp_mode_mask;
+ u32 lp_mode_shift;
+ u32 modeset_reg;
+ u32 qi;
+};
+
+struct mt_regulator_init_data {
+ const struct mt6315_regulator_info *regulator_info;
+ u32 modeset_mask[MT6315_VBUCK_MAX];
+};
+
+struct mt6315_chip {
+ struct device *dev;
+ struct regmap *regmap;
+};
+
+#define MT_BUCK(_name, _bid, _vsel) \
+[_bid] = { \
+ .desc = { \
+ .name = _name, \
+ .of_match = of_match_ptr(_name), \
+ .regulators_node = "regulators", \
+ .ops = &mt6315_volt_range_ops, \
+ .type = REGULATOR_VOLTAGE, \
+ .id = _bid, \
+ .owner = THIS_MODULE, \
+ .n_voltages = 0xbf, \
+ .linear_ranges = mt_volt_range1, \
+ .n_linear_ranges = ARRAY_SIZE(mt_volt_range1), \
+ .vsel_reg = _vsel, \
+ .vsel_mask = 0xff, \
+ .enable_reg = MT6315_BUCK_TOP_CON0, \
+ .enable_mask = BIT(_bid - 1), \
+ .of_map_mode = mt6315_map_mode, \
+ }, \
+ .da_vsel_reg = _bid##_DBG0, \
+ .da_reg = _bid##_DBG4, \
+ .lp_mode_reg = MT6315_BUCK_TOP_CON1, \
+ .lp_mode_mask = BIT(_bid - 1), \
+ .lp_mode_shift = _bid - 1, \
+ .modeset_reg = MT6315_BUCK_TOP_4PHASE_ANA_CON42, \
+ .qi = BIT(0), \
+}
+
+static const struct linear_range mt_volt_range1[] = {
+ REGULATOR_LINEAR_RANGE(0, 0, 0xbf, 6250),
+};
+
+static unsigned int mt6315_map_mode(u32 mode)
+{
+ switch (mode) {
+ case MT6315_BUCK_MODE_AUTO:
+ return REGULATOR_MODE_NORMAL;
+ case MT6315_BUCK_MODE_FORCE_PWM:
+ return REGULATOR_MODE_FAST;
+ case MT6315_BUCK_MODE_LP:
+ return REGULATOR_MODE_IDLE;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int mt6315_regulator_get_voltage_sel(struct regulator_dev *rdev)
+{
+ struct mt_regulator_init_data *init = rdev_get_drvdata(rdev);
+ const struct mt6315_regulator_info *info;
+ int ret, reg_addr, reg_val = 0, reg_en = 0;
+
+ info = &init->regulator_info[rdev_get_id(rdev)];
+ ret = regmap_read(rdev->regmap, info->da_reg, &reg_en);
+ if (ret != 0) {
+ dev_notice(&rdev->dev, "Failed to get enable reg: %d\n", ret);
+ return ret;
+ }
+
+ if (reg_en & info->qi)
+ reg_addr = info->da_vsel_reg;
+ else
+ reg_addr = rdev->desc->vsel_reg;
+
+ ret = regmap_read(rdev->regmap, reg_addr, &reg_val);
+ if (ret != 0) {
+ dev_notice(&rdev->dev, "Failed to get voltage: %d\n", ret);
+ return ret;
+ }
+
+ ret = reg_val & rdev->desc->vsel_mask;
+ return ret;
+}
+
+static unsigned int mt6315_regulator_get_mode(struct regulator_dev *rdev)
+{
+ struct mt_regulator_init_data *init = rdev_get_drvdata(rdev);
+ const struct mt6315_regulator_info *info;
+ int ret = 0, regval = 0;
+ u32 modeset_mask;
+
+ info = &init->regulator_info[rdev_get_id(rdev)];
+ modeset_mask = init->modeset_mask[rdev_get_id(rdev)];
+ ret = regmap_read(rdev->regmap, info->modeset_reg, &regval);
+ if (ret != 0) {
+ dev_notice(&rdev->dev, "Failed to get mode: %d\n", ret);
+ return ret;
+ }
+
+ if ((regval & modeset_mask) == modeset_mask)
+ return REGULATOR_MODE_FAST;
+
+ ret = regmap_read(rdev->regmap, info->lp_mode_reg, &regval);
+ if (ret != 0) {
+ dev_notice(&rdev->dev, "Failed to get lp mode: %d\n", ret);
+ return ret;
+ }
+
+ if (regval & info->lp_mode_mask)
+ return REGULATOR_MODE_IDLE;
+ else
+ return REGULATOR_MODE_NORMAL;
+}
+
+static int mt6315_regulator_set_mode(struct regulator_dev *rdev,
+ u32 mode)
+{
+ struct mt_regulator_init_data *init = rdev_get_drvdata(rdev);
+ const struct mt6315_regulator_info *info;
+ int ret = 0, val, curr_mode;
+ u32 modeset_mask;
+
+ info = &init->regulator_info[rdev_get_id(rdev)];
+ modeset_mask = init->modeset_mask[rdev_get_id(rdev)];
+ curr_mode = mt6315_regulator_get_mode(rdev);
+ switch (mode) {
+ case REGULATOR_MODE_FAST:
+ ret = regmap_update_bits(rdev->regmap,
+ info->modeset_reg,
+ modeset_mask,
+ modeset_mask);
+ break;
+ case REGULATOR_MODE_NORMAL:
+ if (curr_mode == REGULATOR_MODE_FAST) {
+ ret = regmap_update_bits(rdev->regmap,
+ info->modeset_reg,
+ modeset_mask,
+ 0);
+ } else if (curr_mode == REGULATOR_MODE_IDLE) {
+ ret = regmap_update_bits(rdev->regmap,
+ info->lp_mode_reg,
+ info->lp_mode_mask,
+ 0);
+ usleep_range(100, 110);
+ }
+ break;
+ case REGULATOR_MODE_IDLE:
+ val = MT6315_BUCK_MODE_LP >> 1;
+ val <<= info->lp_mode_shift;
+ ret = regmap_update_bits(rdev->regmap,
+ info->lp_mode_reg,
+ info->lp_mode_mask,
+ val);
+ break;
+ default:
+ ret = -EINVAL;
+ goto err_mode;
+ }
+
+err_mode:
+ if (ret != 0) {
+ dev_notice(&rdev->dev, "Failed to set mode: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int mt6315_get_status(struct regulator_dev *rdev)
+{
+ struct mt_regulator_init_data *init = rdev_get_drvdata(rdev);
+ const struct mt6315_regulator_info *info;
+ int ret = 0;
+ u32 regval = 0;
+
+ info = &init->regulator_info[rdev_get_id(rdev)];
+ ret = regmap_read(rdev->regmap, info->da_reg, &regval);
+ if (ret != 0) {
+ dev_notice(&rdev->dev, "Failed to get enable reg: %d\n", ret);
+ return ret;
+ }
+
+ return (regval & info->qi) ? REGULATOR_STATUS_ON : REGULATOR_STATUS_OFF;
+}
+
+static const struct regulator_ops mt6315_volt_range_ops = {
+ .list_voltage = regulator_list_voltage_linear_range,
+ .map_voltage = regulator_map_voltage_linear_range,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .get_voltage_sel = mt6315_regulator_get_voltage_sel,
+ .set_voltage_time_sel = regulator_set_voltage_time_sel,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+ .get_status = mt6315_get_status,
+ .set_mode = mt6315_regulator_set_mode,
+ .get_mode = mt6315_regulator_get_mode,
+};
+
+static const struct mt6315_regulator_info mt6315_regulators[MT6315_VBUCK_MAX] = {
+ MT_BUCK("vbuck1", MT6315_VBUCK1, MT6315_BUCK_TOP_ELR0),
+ MT_BUCK("vbuck2", MT6315_VBUCK2, MT6315_BUCK_TOP_ELR2),
+ MT_BUCK("vbuck3", MT6315_VBUCK3, MT6315_BUCK_TOP_ELR4),
+ MT_BUCK("vbuck4", MT6315_VBUCK4, MT6315_BUCK_TOP_ELR6),
+};
+
+static const struct regmap_config mt6315_regmap_config = {
+ .reg_bits = 16,
+ .val_bits = 8,
+ .max_register = 0x16d0,
+ .fast_io = true,
+};
+
+static const struct of_device_id mt6315_of_match[] = {
+ {
+ .compatible = "mediatek,mt6315_3-regulator",
+ }, {
+ .compatible = "mediatek,mt6315_6-regulator",
+ }, {
+ .compatible = "mediatek,mt6315_7-regulator",
+ }, {
+ /* sentinel */
+ },
+};
+MODULE_DEVICE_TABLE(of, mt6315_of_match);
+
+static void mt6315_parsing_dt(struct regulator_dev *rdev, u32 *arr)
+{
+ struct device_node *np;
+ struct mt_regulator_init_data *init = rdev_get_drvdata(rdev);
+ u32 buck_id, *modeset;
+ int i, icount;
+
+ np = rdev->dev.of_node;
+ if (!np)
+ return;
+
+ icount = of_property_count_elems_of_size(np, "mtk,combined-regulator", sizeof(u32));
+ if (icount <= 0)
+ return;
+
+ modeset = &init->modeset_mask[rdev_get_id(rdev)];
+ for (i = 0; i < icount; i++) {
+ if (of_property_read_u32_index(np, "mtk,combined-regulator", i, &buck_id))
+ return;
+
+ if (buck_id < MT6315_VBUCK_MAX) {
+ /* white list */
+ *(arr + buck_id) = 1;
+ /* add modeset bit of combined-regulator */
+ *modeset += BIT(buck_id - 1);
+ }
+ }
+}
+
+static int mt6315_regulator_probe(struct spmi_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct regmap *regmap;
+ struct mt6315_chip *chip;
+ struct mt_regulator_init_data *init_data;
+ struct regulator_config config = {};
+ struct regulator_dev *rdev;
+ int i;
+ u32 mt6315_dt_list[MT6315_VBUCK_MAX] = {0};
+
+ regmap = devm_regmap_init_spmi_ext(pdev, &mt6315_regmap_config);
+ if (!regmap)
+ return -ENODEV;
+
+ chip = devm_kzalloc(dev, sizeof(struct mt6315_chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ init_data = devm_kzalloc(dev, sizeof(struct mt_regulator_init_data), GFP_KERNEL);
+ if (!init_data)
+ return -ENOMEM;
+
+ chip->dev = dev;
+ chip->regmap = regmap;
+ dev_set_drvdata(dev, chip);
+
+ config.dev = dev;
+ config.regmap = regmap;
+ init_data->regulator_info = mt6315_regulators;
+ for (i = MT6315_VBUCK1; i < MT6315_VBUCK_MAX; i++) {
+ if (mt6315_dt_list[i])
+ continue;
+
+ init_data->modeset_mask[i] = 1 << (i - 1);
+ config.driver_data = init_data;
+ rdev = devm_regulator_register(dev, &mt6315_regulators[i].desc, &config);
+ if (IS_ERR(rdev)) {
+ dev_notice(dev, "Failed to register %s\n", mt6315_regulators[i].desc.name);
+ continue;
+ }
+ mt6315_parsing_dt(rdev, mt6315_dt_list);
+ }
+ return 0;
+}
+
+static void mt6315_regulator_shutdown(struct spmi_device *pdev)
+{
+ struct mt6315_chip *chip = dev_get_drvdata(&pdev->dev);
+ int ret = 0;
+
+ ret |= regmap_write(chip->regmap, MT6315_TOP_TMA_KEY_H, PROTECTION_KEY_H);
+ ret |= regmap_write(chip->regmap, MT6315_TOP_TMA_KEY, PROTECTION_KEY);
+ ret |= regmap_update_bits(chip->regmap, MT6315_TOP2_ELR7, 1, 1);
+ ret |= regmap_write(chip->regmap, MT6315_TOP_TMA_KEY, 0);
+ ret |= regmap_write(chip->regmap, MT6315_TOP_TMA_KEY_H, 0);
+ if (ret < 0)
+ dev_notice(&pdev->dev, "[%#x] Failed to enable power off sequence. %d\n",
+ pdev->usid, ret);
+}
+
+static struct spmi_driver mt6315_regulator_driver = {
+ .driver = {
+ .name = "mt6315-regulator",
+ .of_match_table = mt6315_of_match,
+ },
+ .probe = mt6315_regulator_probe,
+ .shutdown = mt6315_regulator_shutdown,
+};
+
+module_spmi_driver(mt6315_regulator_driver);
+
+MODULE_AUTHOR("Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>");
+MODULE_DESCRIPTION("Regulator Driver for MediaTek MT6315 PMIC");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/regulator/mt6315-regulator.h b/include/linux/regulator/mt6315-regulator.h
new file mode 100644
index 000000000000..4b3bd172cba1
--- /dev/null
+++ b/include/linux/regulator/mt6315-regulator.h
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2020 MediaTek Inc.
+ */
+
+#ifndef __LINUX_REGULATOR_MT6315_H
+#define __LINUX_REGULATOR_MT6315_H
+
+#define MT6315_SLAVE_ID_3 3
+#define MT6315_SLAVE_ID_6 6
+#define MT6315_SLAVE_ID_7 7
+
+/* Register */
+#define MT6315_SWCID_H 0xb
+#define MT6315_TOP2_ELR7 0x139
+#define MT6315_TOP_TMA_KEY 0x39f
+#define MT6315_TOP_TMA_KEY_H 0x3a0
+#define MT6315_BUCK_TOP_CON0 0x1440
+#define MT6315_BUCK_TOP_CON1 0x1443
+#define MT6315_BUCK_TOP_ELR0 0x1449
+#define MT6315_BUCK_TOP_ELR2 0x144b
+#define MT6315_BUCK_TOP_ELR4 0x144d
+#define MT6315_BUCK_TOP_ELR6 0x144f
+#define MT6315_VBUCK1_DBG0 0x1499
+#define MT6315_VBUCK1_DBG4 0x149d
+#define MT6315_VBUCK2_DBG0 0x1519
+#define MT6315_VBUCK2_DBG4 0x151d
+#define MT6315_VBUCK3_DBG0 0x1599
+#define MT6315_VBUCK3_DBG4 0x159d
+#define MT6315_VBUCK4_DBG0 0x1619
+#define MT6315_VBUCK4_DBG4 0x161d
+#define MT6315_BUCK_TOP_4PHASE_ANA_CON42 0x16b1
+
+#define PROTECTION_KEY_H 0x9C
+#define PROTECTION_KEY 0xEA
+
+#endif /* __LINUX_REGULATOR_MT6315_H */
--
2.18.0