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regulator: add support for MP8869 regulator
The MP8869 from Monolithic Power Systems is a single output DC/DC converter. The voltage can be controlled via I2C. Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com> Link: https://lore.kernel.org/r/20200316223020.1a6d92ae@xhacker Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jisheng Zhang
Mark Brown
parent
2473115c47
commit
97be82880b
@ -635,6 +635,13 @@ config REGULATOR_MP8859
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Say M here if you want to include support for the regulator as a
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module. The module will be named "mp8859".
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config REGULATOR_MP886X
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tristate "MPS MP8869 regulator driver"
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depends on I2C && (OF || COMPILE_TEST)
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select REGMAP_I2C
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help
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This driver supports the MP8869 voltage regulator.
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config REGULATOR_MPQ7920
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tristate "Monolithic MPQ7920 PMIC"
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depends on I2C && OF
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@ -80,6 +80,7 @@ obj-$(CONFIG_REGULATOR_MC13XXX_CORE) += mc13xxx-regulator-core.o
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obj-$(CONFIG_REGULATOR_MCP16502) += mcp16502.o
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obj-$(CONFIG_REGULATOR_MP5416) += mp5416.o
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obj-$(CONFIG_REGULATOR_MP8859) += mp8859.o
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obj-$(CONFIG_REGULATOR_MP886X) += mp886x.o
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obj-$(CONFIG_REGULATOR_MPQ7920) += mpq7920.o
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obj-$(CONFIG_REGULATOR_MT6311) += mt6311-regulator.o
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obj-$(CONFIG_REGULATOR_MT6323) += mt6323-regulator.o
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230
drivers/regulator/mp886x.c
Normal file
230
drivers/regulator/mp886x.c
Normal file
@ -0,0 +1,230 @@
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// SPDX-License-Identifier: GPL-2.0
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//
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// MP8869 regulator driver
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//
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// Copyright (C) 2020 Synaptics Incorporated
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//
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// Author: Jisheng Zhang <jszhang@kernel.org>
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/of_regulator.h>
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#define MP886X_VSEL 0x00
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#define MP886X_V_BOOT (1 << 7)
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#define MP886X_SYSCNTLREG1 0x01
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#define MP886X_MODE (1 << 0)
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#define MP886X_GO (1 << 6)
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#define MP886X_EN (1 << 7)
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struct mp886x_device_info {
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struct device *dev;
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struct regulator_desc desc;
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struct regulator_init_data *regulator;
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struct gpio_desc *en_gpio;
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u32 r[2];
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unsigned int sel;
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};
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static int mp886x_set_mode(struct regulator_dev *rdev, unsigned int mode)
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{
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switch (mode) {
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case REGULATOR_MODE_FAST:
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regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
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MP886X_MODE, MP886X_MODE);
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break;
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case REGULATOR_MODE_NORMAL:
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regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
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MP886X_MODE, 0);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static unsigned int mp886x_get_mode(struct regulator_dev *rdev)
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{
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u32 val;
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int ret;
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ret = regmap_read(rdev->regmap, MP886X_SYSCNTLREG1, &val);
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if (ret < 0)
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return ret;
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if (val & MP886X_MODE)
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return REGULATOR_MODE_FAST;
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else
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return REGULATOR_MODE_NORMAL;
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}
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static int mp8869_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel)
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{
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int ret;
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ret = regmap_update_bits(rdev->regmap, MP886X_SYSCNTLREG1,
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MP886X_GO, MP886X_GO);
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if (ret < 0)
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return ret;
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sel <<= ffs(rdev->desc->vsel_mask) - 1;
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return regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
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MP886X_V_BOOT | rdev->desc->vsel_mask, sel);
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}
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static inline unsigned int mp8869_scale(unsigned int uv, u32 r1, u32 r2)
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{
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u32 tmp = uv * r1 / r2;
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return uv + tmp;
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}
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static int mp8869_get_voltage_sel(struct regulator_dev *rdev)
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{
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struct mp886x_device_info *di = rdev_get_drvdata(rdev);
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int ret, uv;
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unsigned int val;
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bool fbloop;
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ret = regmap_read(rdev->regmap, rdev->desc->vsel_reg, &val);
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if (ret)
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return ret;
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fbloop = val & MP886X_V_BOOT;
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if (fbloop) {
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uv = rdev->desc->min_uV;
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uv = mp8869_scale(uv, di->r[0], di->r[1]);
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return regulator_map_voltage_linear(rdev, uv, uv);
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}
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val &= rdev->desc->vsel_mask;
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val >>= ffs(rdev->desc->vsel_mask) - 1;
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return val;
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}
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static const struct regulator_ops mp8869_regulator_ops = {
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.set_voltage_sel = mp8869_set_voltage_sel,
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.get_voltage_sel = mp8869_get_voltage_sel,
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.set_voltage_time_sel = regulator_set_voltage_time_sel,
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.map_voltage = regulator_map_voltage_linear,
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.list_voltage = regulator_list_voltage_linear,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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.set_mode = mp886x_set_mode,
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.get_mode = mp886x_get_mode,
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};
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static int mp886x_regulator_register(struct mp886x_device_info *di,
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struct regulator_config *config)
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{
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struct regulator_desc *rdesc = &di->desc;
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struct regulator_dev *rdev;
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rdesc->name = "mp886x-reg";
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rdesc->supply_name = "vin";
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rdesc->ops = of_device_get_match_data(di->dev);
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rdesc->type = REGULATOR_VOLTAGE;
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rdesc->n_voltages = 128;
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rdesc->enable_reg = MP886X_SYSCNTLREG1;
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rdesc->enable_mask = MP886X_EN;
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rdesc->min_uV = 600000;
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rdesc->uV_step = 10000;
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rdesc->vsel_reg = MP886X_VSEL;
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rdesc->vsel_mask = 0x3f;
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rdesc->owner = THIS_MODULE;
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rdev = devm_regulator_register(di->dev, &di->desc, config);
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if (IS_ERR(rdev))
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return PTR_ERR(rdev);
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di->sel = rdesc->ops->get_voltage_sel(rdev);
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return 0;
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}
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static const struct regmap_config mp886x_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static int mp886x_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device *dev = &client->dev;
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struct device_node *np = dev->of_node;
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struct mp886x_device_info *di;
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struct regulator_config config = { };
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struct regmap *regmap;
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int ret;
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di = devm_kzalloc(dev, sizeof(struct mp886x_device_info), GFP_KERNEL);
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if (!di)
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return -ENOMEM;
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di->regulator = of_get_regulator_init_data(dev, np, &di->desc);
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if (!di->regulator) {
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dev_err(dev, "Platform data not found!\n");
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return -EINVAL;
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}
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ret = of_property_read_u32_array(np, "mps,fb-voltage-divider",
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di->r, 2);
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if (ret)
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return ret;
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di->en_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH);
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if (IS_ERR(di->en_gpio))
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return PTR_ERR(di->en_gpio);
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di->dev = dev;
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regmap = devm_regmap_init_i2c(client, &mp886x_regmap_config);
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if (IS_ERR(regmap)) {
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dev_err(dev, "Failed to allocate regmap!\n");
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return PTR_ERR(regmap);
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}
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i2c_set_clientdata(client, di);
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config.dev = di->dev;
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config.init_data = di->regulator;
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config.regmap = regmap;
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config.driver_data = di;
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config.of_node = np;
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ret = mp886x_regulator_register(di, &config);
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if (ret < 0)
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dev_err(dev, "Failed to register regulator!\n");
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return ret;
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}
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static const struct of_device_id mp886x_dt_ids[] = {
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{
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.compatible = "mps,mp8869",
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.data = &mp8869_regulator_ops
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},
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{ }
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};
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MODULE_DEVICE_TABLE(of, mp886x_dt_ids);
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static const struct i2c_device_id mp886x_id[] = {
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{ "mp886x", },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, mp886x_id);
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static struct i2c_driver mp886x_regulator_driver = {
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.driver = {
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.name = "mp886x-regulator",
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.of_match_table = of_match_ptr(mp886x_dt_ids),
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},
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.probe = mp886x_i2c_probe,
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.id_table = mp886x_id,
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};
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module_i2c_driver(mp886x_regulator_driver);
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MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
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MODULE_DESCRIPTION("MP886x regulator driver");
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MODULE_LICENSE("GPL v2");
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