368 lines
9.2 KiB
C
368 lines
9.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* ROHM BD9571MWV-M and BD9574MWF-M regulator driver
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*
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* Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
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*
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* Based on the TPS65086 driver
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*
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* NOTE: VD09 is missing
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*/
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#include <linux/mfd/rohm-generic.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/mfd/bd9571mwv.h>
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struct bd9571mwv_reg {
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struct regmap *regmap;
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/* DDR Backup Power */
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u8 bkup_mode_cnt_keepon; /* from "rohm,ddr-backup-power" */
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u8 bkup_mode_cnt_saved;
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bool bkup_mode_enabled;
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/* Power switch type */
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bool rstbmode_level;
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bool rstbmode_pulse;
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};
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enum bd9571mwv_regulators { VD09, VD18, VD25, VD33, DVFS };
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#define BD9571MWV_REG(_name, _of, _id, _ops, _vr, _vm, _nv, _min, _step, _lmin)\
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{ \
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.name = _name, \
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.of_match = of_match_ptr(_of), \
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.regulators_node = "regulators", \
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.id = _id, \
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.ops = &_ops, \
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.n_voltages = _nv, \
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.type = REGULATOR_VOLTAGE, \
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.owner = THIS_MODULE, \
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.vsel_reg = _vr, \
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.vsel_mask = _vm, \
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.min_uV = _min, \
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.uV_step = _step, \
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.linear_min_sel = _lmin, \
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}
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static int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev)
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{
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unsigned int val;
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int ret;
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ret = regmap_read(rdev->regmap, BD9571MWV_AVS_SET_MONI, &val);
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if (ret != 0)
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return ret;
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return val & BD9571MWV_AVS_SET_MONI_MASK;
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}
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static int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev,
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unsigned int sel)
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{
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int ret;
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ret = bd9571mwv_avs_get_moni_state(rdev);
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if (ret < 0)
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return ret;
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return regmap_write_bits(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret),
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rdev->desc->vsel_mask, sel);
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}
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static int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev)
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{
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unsigned int val;
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int ret;
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ret = bd9571mwv_avs_get_moni_state(rdev);
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if (ret < 0)
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return ret;
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ret = regmap_read(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret), &val);
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if (ret != 0)
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return ret;
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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 int bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev *rdev,
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unsigned int sel)
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{
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return regmap_write_bits(rdev->regmap, BD9571MWV_DVFS_SETVID,
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rdev->desc->vsel_mask, sel);
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}
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/* Operations permitted on AVS voltage regulator */
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static const struct regulator_ops avs_ops = {
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.set_voltage_sel = bd9571mwv_avs_set_voltage_sel_regmap,
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.map_voltage = regulator_map_voltage_linear,
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.get_voltage_sel = bd9571mwv_avs_get_voltage_sel_regmap,
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.list_voltage = regulator_list_voltage_linear,
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};
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/* Operations permitted on voltage regulators */
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static const struct regulator_ops reg_ops = {
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.set_voltage_sel = bd9571mwv_reg_set_voltage_sel_regmap,
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.map_voltage = regulator_map_voltage_linear,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.list_voltage = regulator_list_voltage_linear,
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};
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/* Operations permitted on voltage monitors */
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static const struct regulator_ops vid_ops = {
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.map_voltage = regulator_map_voltage_linear,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.list_voltage = regulator_list_voltage_linear,
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};
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static const struct regulator_desc regulators[] = {
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BD9571MWV_REG("VD09", "vd09", VD09, avs_ops, 0, 0x7f,
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0x6f, 600000, 10000, 0x3c),
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BD9571MWV_REG("VD18", "vd18", VD18, vid_ops, BD9571MWV_VD18_VID, 0xf,
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16, 1625000, 25000, 0),
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BD9571MWV_REG("VD25", "vd25", VD25, vid_ops, BD9571MWV_VD25_VID, 0xf,
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16, 2150000, 50000, 0),
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BD9571MWV_REG("VD33", "vd33", VD33, vid_ops, BD9571MWV_VD33_VID, 0xf,
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11, 2800000, 100000, 0),
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BD9571MWV_REG("DVFS", "dvfs", DVFS, reg_ops,
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BD9571MWV_DVFS_MONIVDAC, 0x7f,
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0x6f, 600000, 10000, 0x3c),
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};
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#ifdef CONFIG_PM_SLEEP
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static int bd9571mwv_bkup_mode_read(struct bd9571mwv_reg *bdreg,
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unsigned int *mode)
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{
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int ret;
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ret = regmap_read(bdreg->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
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if (ret) {
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dev_err(regmap_get_device(bdreg->regmap),
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"failed to read backup mode (%d)\n", ret);
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return ret;
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}
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return 0;
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}
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static int bd9571mwv_bkup_mode_write(struct bd9571mwv_reg *bdreg,
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unsigned int mode)
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{
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int ret;
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ret = regmap_write(bdreg->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
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if (ret) {
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dev_err(regmap_get_device(bdreg->regmap),
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"failed to configure backup mode 0x%x (%d)\n",
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mode, ret);
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return ret;
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}
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return 0;
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}
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static ssize_t backup_mode_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
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return sysfs_emit(buf, "%s\n", bdreg->bkup_mode_enabled ? "on" : "off");
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}
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static ssize_t backup_mode_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
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unsigned int mode;
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int ret;
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if (!count)
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return 0;
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ret = kstrtobool(buf, &bdreg->bkup_mode_enabled);
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if (ret)
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return ret;
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if (!bdreg->rstbmode_level)
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return count;
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/*
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* Configure DDR Backup Mode, to change the role of the accessory power
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* switch from a power switch to a wake-up switch, or vice versa
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*/
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ret = bd9571mwv_bkup_mode_read(bdreg, &mode);
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if (ret)
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return ret;
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mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
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if (bdreg->bkup_mode_enabled)
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mode |= bdreg->bkup_mode_cnt_keepon;
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ret = bd9571mwv_bkup_mode_write(bdreg, mode);
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if (ret)
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return ret;
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return count;
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}
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static DEVICE_ATTR_RW(backup_mode);
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static int bd9571mwv_suspend(struct device *dev)
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{
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struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
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unsigned int mode;
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int ret;
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if (!bdreg->bkup_mode_enabled)
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return 0;
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/* Save DDR Backup Mode */
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ret = bd9571mwv_bkup_mode_read(bdreg, &mode);
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if (ret)
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return ret;
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bdreg->bkup_mode_cnt_saved = mode;
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if (!bdreg->rstbmode_pulse)
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return 0;
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/* Enable DDR Backup Mode */
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mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
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mode |= bdreg->bkup_mode_cnt_keepon;
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if (mode != bdreg->bkup_mode_cnt_saved)
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return bd9571mwv_bkup_mode_write(bdreg, mode);
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return 0;
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}
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static int bd9571mwv_resume(struct device *dev)
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{
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struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
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if (!bdreg->bkup_mode_enabled)
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return 0;
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/* Restore DDR Backup Mode */
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return bd9571mwv_bkup_mode_write(bdreg, bdreg->bkup_mode_cnt_saved);
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}
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static const struct dev_pm_ops bd9571mwv_pm = {
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SET_SYSTEM_SLEEP_PM_OPS(bd9571mwv_suspend, bd9571mwv_resume)
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};
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static int bd9571mwv_regulator_remove(struct platform_device *pdev)
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{
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device_remove_file(&pdev->dev, &dev_attr_backup_mode);
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return 0;
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}
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#define DEV_PM_OPS &bd9571mwv_pm
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#else
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#define DEV_PM_OPS NULL
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#define bd9571mwv_regulator_remove NULL
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#endif /* CONFIG_PM_SLEEP */
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static int bd9571mwv_regulator_probe(struct platform_device *pdev)
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{
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struct regulator_config config = { };
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struct bd9571mwv_reg *bdreg;
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struct regulator_dev *rdev;
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unsigned int val;
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int i;
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enum rohm_chip_type chip = platform_get_device_id(pdev)->driver_data;
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bdreg = devm_kzalloc(&pdev->dev, sizeof(*bdreg), GFP_KERNEL);
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if (!bdreg)
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return -ENOMEM;
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bdreg->regmap = dev_get_regmap(pdev->dev.parent, NULL);
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platform_set_drvdata(pdev, bdreg);
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config.dev = &pdev->dev;
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config.dev->of_node = pdev->dev.parent->of_node;
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config.driver_data = bdreg;
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config.regmap = bdreg->regmap;
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for (i = 0; i < ARRAY_SIZE(regulators); i++) {
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/* BD9574MWF supports DVFS only */
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if (chip == ROHM_CHIP_TYPE_BD9574 && regulators[i].id != DVFS)
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continue;
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rdev = devm_regulator_register(&pdev->dev, ®ulators[i],
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&config);
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if (IS_ERR(rdev)) {
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dev_err(&pdev->dev, "failed to register %s regulator\n",
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regulators[i].name);
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return PTR_ERR(rdev);
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}
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}
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val = 0;
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of_property_read_u32(config.dev->of_node, "rohm,ddr-backup-power", &val);
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if (val & ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK) {
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dev_err(&pdev->dev, "invalid %s mode %u\n",
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"rohm,ddr-backup-power", val);
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return -EINVAL;
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}
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bdreg->bkup_mode_cnt_keepon = val;
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bdreg->rstbmode_level = of_property_read_bool(config.dev->of_node,
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"rohm,rstbmode-level");
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bdreg->rstbmode_pulse = of_property_read_bool(config.dev->of_node,
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"rohm,rstbmode-pulse");
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if (bdreg->rstbmode_level && bdreg->rstbmode_pulse) {
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dev_err(&pdev->dev, "only one rohm,rstbmode-* may be specified");
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return -EINVAL;
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}
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#ifdef CONFIG_PM_SLEEP
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if (bdreg->bkup_mode_cnt_keepon) {
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int ret;
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/*
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* Backup mode is enabled by default in pulse mode, but needs
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* explicit user setup in level mode.
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*/
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bdreg->bkup_mode_enabled = bdreg->rstbmode_pulse;
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ret = device_create_file(&pdev->dev, &dev_attr_backup_mode);
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if (ret)
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return ret;
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}
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#endif /* CONFIG_PM_SLEEP */
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return 0;
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}
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static const struct platform_device_id bd9571mwv_regulator_id_table[] = {
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{ "bd9571mwv-regulator", ROHM_CHIP_TYPE_BD9571 },
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{ "bd9574mwf-regulator", ROHM_CHIP_TYPE_BD9574 },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(platform, bd9571mwv_regulator_id_table);
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static struct platform_driver bd9571mwv_regulator_driver = {
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.driver = {
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.name = "bd9571mwv-regulator",
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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.pm = DEV_PM_OPS,
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},
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.probe = bd9571mwv_regulator_probe,
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.remove = bd9571mwv_regulator_remove,
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.id_table = bd9571mwv_regulator_id_table,
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};
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module_platform_driver(bd9571mwv_regulator_driver);
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MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
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MODULE_DESCRIPTION("BD9571MWV Regulator driver");
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MODULE_LICENSE("GPL v2");
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