2 * ROHM BD9571MWV-M regulator driver
4 * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
11 * kind, whether expressed or implied; without even the implied warranty
12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License version 2 for more details.
15 * Based on the TPS65086 driver
17 * NOTE: VD09 is missing
20 #include <linux/module.h>
22 #include <linux/platform_device.h>
23 #include <linux/regulator/driver.h>
25 #include <linux/mfd/bd9571mwv.h>
27 struct bd9571mwv_reg {
30 /* DDR Backup Power */
31 u8 bkup_mode_cnt_keepon; /* from "rohm,ddr-backup-power" */
32 u8 bkup_mode_cnt_saved;
34 /* Power switch type */
39 enum bd9571mwv_regulators { VD09, VD18, VD25, VD33, DVFS };
41 #define BD9571MWV_REG(_name, _of, _id, _ops, _vr, _vm, _nv, _min, _step, _lmin)\
44 .of_match = of_match_ptr(_of), \
45 .regulators_node = "regulators", \
49 .type = REGULATOR_VOLTAGE, \
50 .owner = THIS_MODULE, \
55 .linear_min_sel = _lmin, \
58 static int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev)
63 ret = regmap_read(rdev->regmap, BD9571MWV_AVS_SET_MONI, &val);
67 return val & BD9571MWV_AVS_SET_MONI_MASK;
70 static int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev,
75 ret = bd9571mwv_avs_get_moni_state(rdev);
79 return regmap_write_bits(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret),
80 rdev->desc->vsel_mask, sel);
83 static int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev)
88 ret = bd9571mwv_avs_get_moni_state(rdev);
92 ret = regmap_read(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret), &val);
96 val &= rdev->desc->vsel_mask;
97 val >>= ffs(rdev->desc->vsel_mask) - 1;
102 static int bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev *rdev,
105 return regmap_write_bits(rdev->regmap, BD9571MWV_DVFS_SETVID,
106 rdev->desc->vsel_mask, sel);
109 /* Operations permitted on AVS voltage regulator */
110 static struct regulator_ops avs_ops = {
111 .set_voltage_sel = bd9571mwv_avs_set_voltage_sel_regmap,
112 .map_voltage = regulator_map_voltage_linear,
113 .get_voltage_sel = bd9571mwv_avs_get_voltage_sel_regmap,
114 .list_voltage = regulator_list_voltage_linear,
117 /* Operations permitted on voltage regulators */
118 static struct regulator_ops reg_ops = {
119 .set_voltage_sel = bd9571mwv_reg_set_voltage_sel_regmap,
120 .map_voltage = regulator_map_voltage_linear,
121 .get_voltage_sel = regulator_get_voltage_sel_regmap,
122 .list_voltage = regulator_list_voltage_linear,
125 /* Operations permitted on voltage monitors */
126 static struct regulator_ops vid_ops = {
127 .map_voltage = regulator_map_voltage_linear,
128 .get_voltage_sel = regulator_get_voltage_sel_regmap,
129 .list_voltage = regulator_list_voltage_linear,
132 static struct regulator_desc regulators[] = {
133 BD9571MWV_REG("VD09", "vd09", VD09, avs_ops, 0, 0x7f,
134 0x80, 600000, 10000, 0x3c),
135 BD9571MWV_REG("VD18", "vd18", VD18, vid_ops, BD9571MWV_VD18_VID, 0xf,
136 16, 1625000, 25000, 0),
137 BD9571MWV_REG("VD25", "vd25", VD25, vid_ops, BD9571MWV_VD25_VID, 0xf,
138 16, 2150000, 50000, 0),
139 BD9571MWV_REG("VD33", "vd33", VD33, vid_ops, BD9571MWV_VD33_VID, 0xf,
140 11, 2800000, 100000, 0),
141 BD9571MWV_REG("DVFS", "dvfs", DVFS, reg_ops,
142 BD9571MWV_DVFS_MONIVDAC, 0x7f,
143 0x80, 600000, 10000, 0x3c),
146 #ifdef CONFIG_PM_SLEEP
147 static int bd9571mwv_bkup_mode_read(struct bd9571mwv *bd, unsigned int *mode)
151 ret = regmap_read(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
153 dev_err(bd->dev, "failed to read backup mode (%d)\n", ret);
160 static int bd9571mwv_bkup_mode_write(struct bd9571mwv *bd, unsigned int mode)
164 ret = regmap_write(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode);
166 dev_err(bd->dev, "failed to configure backup mode 0x%x (%d)\n",
174 static int bd9571mwv_suspend(struct device *dev)
176 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
180 if (!device_may_wakeup(dev))
183 /* Save DDR Backup Mode */
184 ret = bd9571mwv_bkup_mode_read(bdreg->bd, &mode);
188 bdreg->bkup_mode_cnt_saved = mode;
190 if (!bdreg->rstbmode_pulse)
193 /* Enable DDR Backup Mode */
194 mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK;
195 mode |= bdreg->bkup_mode_cnt_keepon;
197 if (mode != bdreg->bkup_mode_cnt_saved)
198 return bd9571mwv_bkup_mode_write(bdreg->bd, mode);
203 static int bd9571mwv_resume(struct device *dev)
205 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev);
207 if (!device_may_wakeup(dev))
210 /* Restore DDR Backup Mode */
211 return bd9571mwv_bkup_mode_write(bdreg->bd, bdreg->bkup_mode_cnt_saved);
214 static const struct dev_pm_ops bd9571mwv_pm = {
215 SET_SYSTEM_SLEEP_PM_OPS(bd9571mwv_suspend, bd9571mwv_resume)
218 #define DEV_PM_OPS &bd9571mwv_pm
220 #define DEV_PM_OPS NULL
221 #endif /* CONFIG_PM_SLEEP */
223 static int bd9571mwv_regulator_probe(struct platform_device *pdev)
225 struct bd9571mwv *bd = dev_get_drvdata(pdev->dev.parent);
226 struct regulator_config config = { };
227 struct bd9571mwv_reg *bdreg;
228 struct regulator_dev *rdev;
232 bdreg = devm_kzalloc(&pdev->dev, sizeof(*bdreg), GFP_KERNEL);
238 platform_set_drvdata(pdev, bdreg);
240 config.dev = &pdev->dev;
241 config.dev->of_node = bd->dev->of_node;
242 config.driver_data = bd;
243 config.regmap = bd->regmap;
245 for (i = 0; i < ARRAY_SIZE(regulators); i++) {
246 rdev = devm_regulator_register(&pdev->dev, ®ulators[i],
249 dev_err(bd->dev, "failed to register %s regulator\n",
251 return PTR_ERR(rdev);
256 of_property_read_u32(bd->dev->of_node, "rohm,ddr-backup-power", &val);
257 if (val & ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK) {
258 dev_err(bd->dev, "invalid %s mode %u\n",
259 "rohm,ddr-backup-power", val);
262 bdreg->bkup_mode_cnt_keepon = val;
264 bdreg->rstbmode_level = of_property_read_bool(bd->dev->of_node,
265 "rohm,rstbmode-level");
266 bdreg->rstbmode_pulse = of_property_read_bool(bd->dev->of_node,
267 "rohm,rstbmode-pulse");
268 if (bdreg->rstbmode_level && bdreg->rstbmode_pulse) {
269 dev_err(bd->dev, "only one rohm,rstbmode-* may be specified");
273 if (bdreg->bkup_mode_cnt_keepon) {
274 device_set_wakeup_capable(&pdev->dev, true);
276 * Wakeup is enabled by default in pulse mode, but needs
277 * explicit user setup in level mode.
279 device_set_wakeup_enable(&pdev->dev, bdreg->rstbmode_pulse);
285 static const struct platform_device_id bd9571mwv_regulator_id_table[] = {
286 { "bd9571mwv-regulator", },
289 MODULE_DEVICE_TABLE(platform, bd9571mwv_regulator_id_table);
291 static struct platform_driver bd9571mwv_regulator_driver = {
293 .name = "bd9571mwv-regulator",
296 .probe = bd9571mwv_regulator_probe,
297 .id_table = bd9571mwv_regulator_id_table,
299 module_platform_driver(bd9571mwv_regulator_driver);
301 MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
302 MODULE_DESCRIPTION("BD9571MWV Regulator driver");
303 MODULE_LICENSE("GPL v2");