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784ed36958
Enable regmap cache to reduce i2c transactions and corresponding interrupts if regulator is accessed frequently. Since the register map is small -- there's only one register in sy8824c and sy8824e, there are only two registers in sy20276 and sy20278, so we use a FLAT regmap cache. Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com> Link: https://lore.kernel.org/r/20210803165043.042ec24d@xhacker.debian Signed-off-by: Mark Brown <broonie@kernel.org>
246 lines
5.8 KiB
C
246 lines
5.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// SY8824C/SY8824E regulator driver
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//
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// Copyright (C) 2019 Synaptics Incorporated
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//
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// Author: Jisheng Zhang <jszhang@kernel.org>
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#include <linux/module.h>
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#include <linux/i2c.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 SY8824C_BUCK_EN (1 << 7)
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#define SY8824C_MODE (1 << 6)
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struct sy8824_config {
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/* registers */
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unsigned int vol_reg;
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unsigned int mode_reg;
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unsigned int enable_reg;
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/* Voltage range and step(linear) */
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unsigned int vsel_min;
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unsigned int vsel_step;
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unsigned int vsel_count;
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const struct regmap_config *config;
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};
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struct sy8824_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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const struct sy8824_config *cfg;
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};
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static int sy8824_set_mode(struct regulator_dev *rdev, unsigned int mode)
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{
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struct sy8824_device_info *di = rdev_get_drvdata(rdev);
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const struct sy8824_config *cfg = di->cfg;
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switch (mode) {
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case REGULATOR_MODE_FAST:
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regmap_update_bits(rdev->regmap, cfg->mode_reg,
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SY8824C_MODE, SY8824C_MODE);
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break;
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case REGULATOR_MODE_NORMAL:
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regmap_update_bits(rdev->regmap, cfg->mode_reg,
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SY8824C_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 sy8824_get_mode(struct regulator_dev *rdev)
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{
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struct sy8824_device_info *di = rdev_get_drvdata(rdev);
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const struct sy8824_config *cfg = di->cfg;
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u32 val;
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int ret = 0;
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ret = regmap_read(rdev->regmap, cfg->mode_reg, &val);
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if (ret < 0)
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return ret;
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if (val & SY8824C_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 const struct regulator_ops sy8824_regulator_ops = {
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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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 = sy8824_set_mode,
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.get_mode = sy8824_get_mode,
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};
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static int sy8824_regulator_register(struct sy8824_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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const struct sy8824_config *cfg = di->cfg;
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struct regulator_dev *rdev;
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rdesc->name = "sy8824-reg";
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rdesc->supply_name = "vin";
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rdesc->ops = &sy8824_regulator_ops;
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rdesc->type = REGULATOR_VOLTAGE;
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rdesc->n_voltages = cfg->vsel_count;
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rdesc->enable_reg = cfg->enable_reg;
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rdesc->enable_mask = SY8824C_BUCK_EN;
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rdesc->min_uV = cfg->vsel_min;
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rdesc->uV_step = cfg->vsel_step;
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rdesc->vsel_reg = cfg->vol_reg;
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rdesc->vsel_mask = cfg->vsel_count - 1;
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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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return PTR_ERR_OR_ZERO(rdev);
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}
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static const struct regmap_config sy8824_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.num_reg_defaults_raw = 1,
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.cache_type = REGCACHE_FLAT,
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};
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static const struct regmap_config sy20276_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.num_reg_defaults_raw = 2,
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.cache_type = REGCACHE_FLAT,
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};
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static int sy8824_i2c_probe(struct i2c_client *client)
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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 sy8824_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 sy8824_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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di->dev = dev;
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di->cfg = of_device_get_match_data(dev);
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regmap = devm_regmap_init_i2c(client, di->cfg->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 = sy8824_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 sy8824_config sy8824c_cfg = {
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.vol_reg = 0x00,
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.mode_reg = 0x00,
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.enable_reg = 0x00,
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.vsel_min = 762500,
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.vsel_step = 12500,
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.vsel_count = 64,
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.config = &sy8824_regmap_config,
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};
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static const struct sy8824_config sy8824e_cfg = {
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.vol_reg = 0x00,
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.mode_reg = 0x00,
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.enable_reg = 0x00,
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.vsel_min = 700000,
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.vsel_step = 12500,
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.vsel_count = 64,
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.config = &sy8824_regmap_config,
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};
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static const struct sy8824_config sy20276_cfg = {
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.vol_reg = 0x00,
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.mode_reg = 0x01,
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.enable_reg = 0x01,
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.vsel_min = 600000,
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.vsel_step = 10000,
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.vsel_count = 128,
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.config = &sy20276_regmap_config,
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};
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static const struct sy8824_config sy20278_cfg = {
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.vol_reg = 0x00,
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.mode_reg = 0x01,
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.enable_reg = 0x01,
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.vsel_min = 762500,
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.vsel_step = 12500,
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.vsel_count = 64,
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.config = &sy20276_regmap_config,
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};
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static const struct of_device_id sy8824_dt_ids[] = {
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{
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.compatible = "silergy,sy8824c",
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.data = &sy8824c_cfg
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},
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{
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.compatible = "silergy,sy8824e",
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.data = &sy8824e_cfg
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},
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{
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.compatible = "silergy,sy20276",
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.data = &sy20276_cfg
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},
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{
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.compatible = "silergy,sy20278",
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.data = &sy20278_cfg
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},
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{ }
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};
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MODULE_DEVICE_TABLE(of, sy8824_dt_ids);
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static const struct i2c_device_id sy8824_id[] = {
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{ "sy8824", },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, sy8824_id);
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static struct i2c_driver sy8824_regulator_driver = {
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.driver = {
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.name = "sy8824-regulator",
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.of_match_table = of_match_ptr(sy8824_dt_ids),
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},
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.probe_new = sy8824_i2c_probe,
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.id_table = sy8824_id,
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};
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module_i2c_driver(sy8824_regulator_driver);
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MODULE_AUTHOR("Jisheng Zhang <jszhang@kernel.org>");
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MODULE_DESCRIPTION("SY8824C/SY8824E regulator driver");
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MODULE_LICENSE("GPL v2");
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