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289 lines
7.5 KiB
289 lines
7.5 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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#include <linux/bitops.h> |
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#include <linux/delay.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/i2c.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/mutex.h> |
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#include <linux/regmap.h> |
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#include <linux/regulator/driver.h> |
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enum { |
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RTQ6752_IDX_PAVDD = 0, |
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RTQ6752_IDX_NAVDD = 1, |
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RTQ6752_IDX_MAX |
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}; |
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#define RTQ6752_REG_PAVDD 0x00 |
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#define RTQ6752_REG_NAVDD 0x01 |
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#define RTQ6752_REG_PAVDDONDLY 0x07 |
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#define RTQ6752_REG_PAVDDSSTIME 0x08 |
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#define RTQ6752_REG_NAVDDONDLY 0x0D |
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#define RTQ6752_REG_NAVDDSSTIME 0x0E |
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#define RTQ6752_REG_OPTION1 0x12 |
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#define RTQ6752_REG_CHSWITCH 0x16 |
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#define RTQ6752_REG_FAULT 0x1D |
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#define RTQ6752_VOUT_MASK GENMASK(5, 0) |
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#define RTQ6752_NAVDDEN_MASK BIT(3) |
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#define RTQ6752_PAVDDEN_MASK BIT(0) |
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#define RTQ6752_PAVDDAD_MASK BIT(4) |
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#define RTQ6752_NAVDDAD_MASK BIT(3) |
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#define RTQ6752_PAVDDF_MASK BIT(3) |
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#define RTQ6752_NAVDDF_MASK BIT(0) |
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#define RTQ6752_ENABLE_MASK (BIT(RTQ6752_IDX_MAX) - 1) |
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#define RTQ6752_VOUT_MINUV 5000000 |
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#define RTQ6752_VOUT_STEPUV 50000 |
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#define RTQ6752_VOUT_NUM 47 |
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#define RTQ6752_I2CRDY_TIMEUS 1000 |
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#define RTQ6752_MINSS_TIMEUS 5000 |
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struct rtq6752_priv { |
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struct regmap *regmap; |
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struct gpio_desc *enable_gpio; |
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struct mutex lock; |
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unsigned char enable_flag; |
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}; |
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static int rtq6752_set_vdd_enable(struct regulator_dev *rdev) |
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{ |
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struct rtq6752_priv *priv = rdev_get_drvdata(rdev); |
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int rid = rdev_get_id(rdev), ret; |
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mutex_lock(&priv->lock); |
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if (priv->enable_gpio) { |
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gpiod_set_value(priv->enable_gpio, 1); |
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usleep_range(RTQ6752_I2CRDY_TIMEUS, |
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RTQ6752_I2CRDY_TIMEUS + 100); |
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} |
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if (!priv->enable_flag) { |
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regcache_cache_only(priv->regmap, false); |
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ret = regcache_sync(priv->regmap); |
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if (ret) { |
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mutex_unlock(&priv->lock); |
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return ret; |
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} |
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} |
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priv->enable_flag |= BIT(rid); |
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mutex_unlock(&priv->lock); |
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return regulator_enable_regmap(rdev); |
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} |
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static int rtq6752_set_vdd_disable(struct regulator_dev *rdev) |
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{ |
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struct rtq6752_priv *priv = rdev_get_drvdata(rdev); |
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int rid = rdev_get_id(rdev), ret; |
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ret = regulator_disable_regmap(rdev); |
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if (ret) |
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return ret; |
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mutex_lock(&priv->lock); |
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priv->enable_flag &= ~BIT(rid); |
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if (!priv->enable_flag) { |
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regcache_cache_only(priv->regmap, true); |
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regcache_mark_dirty(priv->regmap); |
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} |
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if (priv->enable_gpio) |
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gpiod_set_value(priv->enable_gpio, 0); |
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mutex_unlock(&priv->lock); |
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return 0; |
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} |
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static int rtq6752_get_error_flags(struct regulator_dev *rdev, |
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unsigned int *flags) |
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{ |
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unsigned int val, events = 0; |
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const unsigned int fault_mask[] = { |
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RTQ6752_PAVDDF_MASK, RTQ6752_NAVDDF_MASK }; |
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int rid = rdev_get_id(rdev), ret; |
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ret = regmap_read(rdev->regmap, RTQ6752_REG_FAULT, &val); |
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if (ret) |
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return ret; |
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if (val & fault_mask[rid]) |
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events = REGULATOR_ERROR_REGULATION_OUT; |
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*flags = events; |
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return 0; |
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} |
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static const struct regulator_ops rtq6752_regulator_ops = { |
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.list_voltage = regulator_list_voltage_linear, |
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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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.enable = rtq6752_set_vdd_enable, |
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.disable = rtq6752_set_vdd_disable, |
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.is_enabled = regulator_is_enabled_regmap, |
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.set_active_discharge = regulator_set_active_discharge_regmap, |
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.get_error_flags = rtq6752_get_error_flags, |
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}; |
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static const struct regulator_desc rtq6752_regulator_descs[] = { |
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{ |
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.name = "rtq6752-pavdd", |
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.of_match = of_match_ptr("pavdd"), |
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.regulators_node = of_match_ptr("regulators"), |
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.id = RTQ6752_IDX_PAVDD, |
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.n_voltages = RTQ6752_VOUT_NUM, |
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.ops = &rtq6752_regulator_ops, |
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.owner = THIS_MODULE, |
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.min_uV = RTQ6752_VOUT_MINUV, |
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.uV_step = RTQ6752_VOUT_STEPUV, |
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.enable_time = RTQ6752_MINSS_TIMEUS, |
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.vsel_reg = RTQ6752_REG_PAVDD, |
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.vsel_mask = RTQ6752_VOUT_MASK, |
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.enable_reg = RTQ6752_REG_CHSWITCH, |
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.enable_mask = RTQ6752_PAVDDEN_MASK, |
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.active_discharge_reg = RTQ6752_REG_OPTION1, |
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.active_discharge_mask = RTQ6752_PAVDDAD_MASK, |
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.active_discharge_off = RTQ6752_PAVDDAD_MASK, |
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}, |
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{ |
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.name = "rtq6752-navdd", |
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.of_match = of_match_ptr("navdd"), |
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.regulators_node = of_match_ptr("regulators"), |
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.id = RTQ6752_IDX_NAVDD, |
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.n_voltages = RTQ6752_VOUT_NUM, |
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.ops = &rtq6752_regulator_ops, |
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.owner = THIS_MODULE, |
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.min_uV = RTQ6752_VOUT_MINUV, |
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.uV_step = RTQ6752_VOUT_STEPUV, |
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.enable_time = RTQ6752_MINSS_TIMEUS, |
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.vsel_reg = RTQ6752_REG_NAVDD, |
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.vsel_mask = RTQ6752_VOUT_MASK, |
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.enable_reg = RTQ6752_REG_CHSWITCH, |
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.enable_mask = RTQ6752_NAVDDEN_MASK, |
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.active_discharge_reg = RTQ6752_REG_OPTION1, |
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.active_discharge_mask = RTQ6752_NAVDDAD_MASK, |
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.active_discharge_off = RTQ6752_NAVDDAD_MASK, |
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} |
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}; |
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static int rtq6752_init_device_properties(struct rtq6752_priv *priv) |
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{ |
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u8 raw_vals[] = { 0, 0 }; |
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int ret; |
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/* Configure PAVDD on and softstart delay time to the minimum */ |
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ret = regmap_raw_write(priv->regmap, RTQ6752_REG_PAVDDONDLY, raw_vals, |
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ARRAY_SIZE(raw_vals)); |
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if (ret) |
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return ret; |
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/* Configure NAVDD on and softstart delay time to the minimum */ |
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return regmap_raw_write(priv->regmap, RTQ6752_REG_NAVDDONDLY, raw_vals, |
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ARRAY_SIZE(raw_vals)); |
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} |
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static bool rtq6752_is_volatile_reg(struct device *dev, unsigned int reg) |
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{ |
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if (reg == RTQ6752_REG_FAULT) |
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return true; |
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return false; |
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} |
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static const struct reg_default rtq6752_reg_defaults[] = { |
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{ RTQ6752_REG_PAVDD, 0x14 }, |
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{ RTQ6752_REG_NAVDD, 0x14 }, |
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{ RTQ6752_REG_PAVDDONDLY, 0x01 }, |
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{ RTQ6752_REG_PAVDDSSTIME, 0x01 }, |
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{ RTQ6752_REG_NAVDDONDLY, 0x01 }, |
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{ RTQ6752_REG_NAVDDSSTIME, 0x01 }, |
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{ RTQ6752_REG_OPTION1, 0x07 }, |
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{ RTQ6752_REG_CHSWITCH, 0x29 }, |
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}; |
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static const struct regmap_config rtq6752_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.cache_type = REGCACHE_RBTREE, |
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.max_register = RTQ6752_REG_FAULT, |
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.reg_defaults = rtq6752_reg_defaults, |
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.num_reg_defaults = ARRAY_SIZE(rtq6752_reg_defaults), |
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.volatile_reg = rtq6752_is_volatile_reg, |
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}; |
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static int rtq6752_probe(struct i2c_client *i2c) |
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{ |
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struct rtq6752_priv *priv; |
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struct regulator_config reg_cfg = {}; |
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struct regulator_dev *rdev; |
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int i, ret; |
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priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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mutex_init(&priv->lock); |
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priv->enable_gpio = devm_gpiod_get_optional(&i2c->dev, "enable", |
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GPIOD_OUT_HIGH); |
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if (IS_ERR(priv->enable_gpio)) { |
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dev_err(&i2c->dev, "Failed to get 'enable' gpio\n"); |
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return PTR_ERR(priv->enable_gpio); |
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} |
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usleep_range(RTQ6752_I2CRDY_TIMEUS, RTQ6752_I2CRDY_TIMEUS + 100); |
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/* Default EN pin to high, PAVDD and NAVDD will be on */ |
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priv->enable_flag = RTQ6752_ENABLE_MASK; |
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priv->regmap = devm_regmap_init_i2c(i2c, &rtq6752_regmap_config); |
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if (IS_ERR(priv->regmap)) { |
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dev_err(&i2c->dev, "Failed to init regmap\n"); |
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return PTR_ERR(priv->regmap); |
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} |
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ret = rtq6752_init_device_properties(priv); |
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if (ret) { |
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dev_err(&i2c->dev, "Failed to init device properties\n"); |
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return ret; |
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} |
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reg_cfg.dev = &i2c->dev; |
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reg_cfg.regmap = priv->regmap; |
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reg_cfg.driver_data = priv; |
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for (i = 0; i < ARRAY_SIZE(rtq6752_regulator_descs); i++) { |
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rdev = devm_regulator_register(&i2c->dev, |
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rtq6752_regulator_descs + i, |
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®_cfg); |
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if (IS_ERR(rdev)) { |
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dev_err(&i2c->dev, "Failed to init %d regulator\n", i); |
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return PTR_ERR(rdev); |
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} |
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} |
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return 0; |
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} |
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static const struct of_device_id __maybe_unused rtq6752_device_table[] = { |
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{ .compatible = "richtek,rtq6752", }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, rtq6752_device_table); |
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static struct i2c_driver rtq6752_driver = { |
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.driver = { |
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.name = "rtq6752", |
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.of_match_table = rtq6752_device_table, |
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}, |
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.probe_new = rtq6752_probe, |
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}; |
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module_i2c_driver(rtq6752_driver); |
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MODULE_AUTHOR("ChiYuan Huang <[email protected]>"); |
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MODULE_DESCRIPTION("Richtek RTQ6752 Regulator Driver"); |
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MODULE_LICENSE("GPL v2");
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