1 // SPDX-License-Identifier: GPL-2.0
3 // bd71837-regulator.c ROHM BD71837MWV/BD71847MWV regulator driver
9 #include <linux/mfd/rohm-bd718x7.h>
13 #include <linux/regulator/driver.h>
14 #include <linux/regulator/machine.h>
15 #include <linux/regulator/of_regulator.h>
20  * controlled by software - or by PMIC internal HW state machine. Whether
21  * regulator should be under SW or HW control can be defined from device-tree.
65 	dev_dbg(&rdev->dev, "Buck[%d] Set Ramp = %d\n", id + 1,  in bd718xx_buck1234_set_ramp_delay()
82 		dev_err(&rdev->dev,  in bd718xx_buck1234_set_ramp_delay()
84 			rdev->desc->name, ramp_delay);  in bd718xx_buck1234_set_ramp_delay()
87 	return regmap_update_bits(rdev->regmap, BD718XX_REG_BUCK1_CTRL + id,  in bd718xx_buck1234_set_ramp_delay()
97  * Note for next hacker - these PMICs have a register where the HW state can be
98  * read. If assuming RUN appears to be false in your use-case - you can
117 	ret = regmap_read(rdev->regmap, rdev->desc->enable_reg, &val);  in bd71837_get_buck34_enable_hwctrl()
127  * is changed. Hence we return -EBUSY for these if voltage is changed
131  * enabled. But if voltage is increased the LDO power-good monitoring
139 	if (rdev->desc->ops->is_enabled(rdev))  in bd71837_set_voltage_sel_restricted()
140 		return -EBUSY;  in bd71837_set_voltage_sel_restricted()
152 		 * Let's allow scheduling as we use I2C anyways. We just need to  in voltage_change_done()
153 		 * guarantee minimum of 1ms sleep - it shouldn't matter if we  in voltage_change_done()
160 		 * when voltage is set.  in voltage_change_done()
163 		 * aware of such use-cases so for the sake of the simplicity  in voltage_change_done()
166 		ret = regmap_update_bits(rdev->regmap, BD718XX_REG_MVRFLTMASK2,  in voltage_change_done()
169 			dev_err(&rdev->dev,  in voltage_change_done()
170 				"Failed to re-enable voltage monitoring (%d)\n",  in voltage_change_done()
181 	if (rdev->desc->ops->is_enabled(rdev)) {  in voltage_change_prepare()
184 		now = rdev->desc->ops->get_voltage_sel(rdev);  in voltage_change_prepare()
188 		now = rdev->desc->ops->list_voltage(rdev, now);  in voltage_change_prepare()
192 		new = rdev->desc->ops->list_voltage(rdev, sel);  in voltage_change_prepare()
198 		 * disable the power-good detection until voltage has reached  in voltage_change_prepare()
200 		 * it takes is 1000us. I assume that on systems with light load  in voltage_change_prepare()
201 		 * this might be less - and we could probably use DT to give  in voltage_change_prepare()
206 		 * 1ms sleep here (and allow scheduling). If this turns out to  in voltage_change_prepare()
211 			int ldo_offset = rdev->desc->id - BD718XX_LDO1;  in voltage_change_prepare()
214 			ret = regmap_update_bits(rdev->regmap,  in voltage_change_prepare()
218 				dev_err(&rdev->dev,  in voltage_change_prepare()
263 	if (rdev->desc->ops->is_enabled(rdev))  in bd71837_set_voltage_sel_pickable_restricted()
264 		return -EBUSY;  in bd71837_set_voltage_sel_pickable_restricted()
343  * bit [2] in CTRL register is used to indicate if regulator should be ON.
355  * OPS for all of the ICs - BD718(37/47/50)
543  * beginning of shut-down sequence. As bucks 6 and 7 are parent
544  * supplies for LDO5 and LDO6 - this causes LDO5/6 voltage
573 	return rohm_regulator_set_dvs_levels(&data->dvs, np, desc, cfg->regmap);  in buck_set_hw_dvs_levels()
1316 		if (!of_node_name_eq(np, reg_data[i-1].desc.of_match))  in mark_hw_controlled()
1319 		*info |= 1 << (i - 1);  in mark_hw_controlled()
1320 		dev_dbg(dev, "regulator %d runlevel controlled\n", i);  in mark_hw_controlled()
1323 	dev_warn(dev, "Bad regulator node\n");  in mark_hw_controlled()
1331 	struct device_node *nproot = dev->of_node;  in get_hw_controlled_regulators()
1332 	const char *prop = "rohm,no-regulator-enable-control";  in get_hw_controlled_regulators()
1339 		return -ENODEV;  in get_hw_controlled_regulators()
1358 	enum rohm_chip_type chip = platform_get_device_id(pdev)->driver_data;  in bd718xx_probe()
1361 	mfd = dev_get_drvdata(pdev->dev.parent);  in bd718xx_probe()
1363 		dev_err(&pdev->dev, "No MFD driver data\n");  in bd718xx_probe()
1364 		err = -EINVAL;  in bd718xx_probe()
1382 		dev_err(&pdev->dev, "Unsupported chip type\n");  in bd718xx_probe()
1383 		err = -EINVAL;  in bd718xx_probe()
1388 	err = regmap_update_bits(mfd->chip.regmap, BD718XX_REG_REGLOCK,  in bd718xx_probe()
1391 		dev_err(&pdev->dev, "Failed to unlock PMIC (%d)\n", err);  in bd718xx_probe()
1394 		dev_dbg(&pdev->dev, "Unlocked lock register 0x%x\n",  in bd718xx_probe()
1398 	use_snvs = of_property_read_bool(pdev->dev.parent->of_node,  in bd718xx_probe()
1399 					 "rohm,reset-snvs-powered");  in bd718xx_probe()
1407 		err = regmap_update_bits(mfd->chip.regmap,  in bd718xx_probe()
1415 			dev_err(&pdev->dev, "Failed to change reset target\n");  in bd718xx_probe()
1418 			dev_dbg(&pdev->dev,  in bd718xx_probe()
1423 	config.dev = pdev->dev.parent;  in bd718xx_probe()
1424 	config.regmap = mfd->chip.regmap;  in bd718xx_probe()
1426 	 * There are cases when we want to leave the enable-control for  in bd718xx_probe()
1429 	 * in order to set the system to SUSPEND state.  in bd718xx_probe()
1431 	 * If regulator is taken under SW control the regulator state will not  in bd718xx_probe()
1432 	 * be affected by PMIC state machine - Eg. regulator is likely to stay  in bd718xx_probe()
1435 	get_hw_controlled_regulators(pdev->dev.parent, reg_data, num_reg_data,  in bd718xx_probe()
1446 		desc = &r->desc;  in bd718xx_probe()
1449 			desc->ops = hwops[i];  in bd718xx_probe()
1451 			desc->ops = swops[i];  in bd718xx_probe()
1453 		rdev = devm_regulator_register(&pdev->dev, desc, &config);  in bd718xx_probe()
1455 			dev_err(&pdev->dev,  in bd718xx_probe()
1456 				"failed to register %s regulator\n",  in bd718xx_probe()
1457 				desc->name);  in bd718xx_probe()
1463 		 * Regulator register gets the regulator constraints and  in bd718xx_probe()
1471 		 * transition from POWEROFF is done to SNVS - then all power  in bd718xx_probe()
1472 		 * rails controlled by SW (having SEL bit set) stay disabled  in bd718xx_probe()
1479 		    !rdev->constraints->always_on ||  in bd718xx_probe()
1480 		    !rdev->constraints->boot_on)) {  in bd718xx_probe()
1481 			err = regmap_update_bits(mfd->chip.regmap, r->init.reg,  in bd718xx_probe()
1482 						 r->init.mask, r->init.val);  in bd718xx_probe()
1484 				dev_err(&pdev->dev,  in bd718xx_probe()
1486 					desc->name);  in bd718xx_probe()
1490 		for (j = 0; j < r->additional_init_amnt; j++) {  in bd718xx_probe()
1491 			err = regmap_update_bits(mfd->chip.regmap,  in bd718xx_probe()
1492 						 r->additional_inits[j].reg,  in bd718xx_probe()
1493 						 r->additional_inits[j].mask,  in bd718xx_probe()
1494 						 r->additional_inits[j].val);  in bd718xx_probe()
1496 				dev_err(&pdev->dev,  in bd718xx_probe()
1498 					desc->name);  in bd718xx_probe()
1509 	{ "bd71837-pmic", ROHM_CHIP_TYPE_BD71837 },
1510 	{ "bd71847-pmic", ROHM_CHIP_TYPE_BD71847 },
1517 		.name = "bd718xx-pmic",
1526 MODULE_DESCRIPTION("BD71837/BD71847 voltage regulator driver");
1528 MODULE_ALIAS("platform:bd718xx-pmic");