drivers/regulator/mcp16502.c

1 // SPDX-License-Identifier: GPL-2.0
9 // Inspired from tps65086-regulator.c
29  * The PMIC has four sets of registers corresponding to four power modes:
30  * Performance, Active, Low-power, Hibernate.
33  * Each regulator has a register for each power mode. To access a register
34  * for a specific regulator and mode BASE_* and OFFSET_* need to be added.
41  * a low-power state while the PMIC is in Active mode. They are supposed to be
42  * configured at startup and then simply transition to/from a global low-power
43  * state by setting the GPIO lpm pin high/low.
45  * This driver keeps the PMIC in Active mode, Low-power state is set for the
46  * regulators by enabling/disabling operating mode (FPWM or Auto PFM).
48  * The PMIC's Low-power and Hibernate modes are used during standby/suspend.
49  * To enter standby/suspend the PMIC will go to Low-power mode. From there, it
50  * will transition to Hibernate when the PWRHLD line is set to low by the MPU.
75  * enum mcp16502_reg - MCP16502 regulators's registers
77  * @MCP16502_REG_LPM: low power mode state register
79  * @MCP16502_REG_HPM: high-performance mode register
102 static unsigned int mcp16502_of_map_mode(unsigned int mode)  in mcp16502_of_map_mode()  argument
104 	if (mode == REGULATOR_MODE_NORMAL || mode == REGULATOR_MODE_IDLE)  in mcp16502_of_map_mode()
105 		return mode;  in mcp16502_of_map_mode()
145  * struct mcp16502 - PMIC representation
153  * mcp16502_gpio_set_mode() - set the GPIO corresponding value
157 static void mcp16502_gpio_set_mode(struct mcp16502 *mcp, int mode)  in mcp16502_gpio_set_mode()  argument
159 	switch (mode) {  in mcp16502_gpio_set_mode()
161 		gpiod_set_value(mcp->lpm, 0);  in mcp16502_gpio_set_mode()
165 		gpiod_set_value(mcp->lpm, 1);  in mcp16502_gpio_set_mode()
168 		pr_err("%s: %d invalid\n", __func__, mode);  in mcp16502_gpio_set_mode()
173  * mcp16502_get_reg() - get the PMIC's state configuration register for opmode
176  * @opmode: the PMIC's operating mode ACTIVE, Low-power, Hibernate
188 		return -EINVAL;  in mcp16502_get_state_reg()
193  * mcp16502_get_mode() - return the current operating mode of a regulator
196  *	 use the Active mode registers.
198  * Note: this is different from the PMIC's operatig mode, it is the
199  *	 MODE bit from the regulator's register.
210 	ret = regmap_read(rdev->regmap, reg, &val);  in mcp16502_get_mode()
225  * _mcp16502_set_mode() - helper for set_mode and set_suspend_mode
227  * @rdev: the regulator for which we are setting the mode
228  * @mode: the regulator's mode (the one from MODE bit)
229  * @opmode: the PMIC's operating mode: Active/Low-power/Hibernate
231 static int _mcp16502_set_mode(struct regulator_dev *rdev, unsigned int mode,  in _mcp16502_set_mode()  argument
241 	switch (mode) {  in _mcp16502_set_mode()
249 		return -EINVAL;  in _mcp16502_set_mode()
252 	reg = regmap_update_bits(rdev->regmap, reg, MCP16502_MODE, val);  in _mcp16502_set_mode()
257  * mcp16502_set_mode() - regulator_ops set_mode
259 static int mcp16502_set_mode(struct regulator_dev *rdev, unsigned int mode)  in mcp16502_set_mode()  argument
261 	return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_ACTIVE);  in mcp16502_set_mode()
265  * mcp16502_get_status() - regulator_ops get_status
272 	ret = regmap_read(rdev->regmap, MCP16502_STAT_BASE(rdev_get_id(rdev)),  in mcp16502_get_status()
296 	ret = regmap_read(rdev->regmap, MCP16502_REG_BASE(id, CFG), &val);  in mcp16502_set_voltage_time_sel()
301 	uV_delta = abs(new_sel * rdev->desc->linear_ranges->step -  in mcp16502_set_voltage_time_sel()
302 		       old_sel * rdev->desc->linear_ranges->step);  in mcp16502_set_voltage_time_sel()
319 		return -EINVAL;  in mcp16502_set_voltage_time_sel()
327  * mcp16502_suspend_get_target_reg() - get the reg of the target suspend PMIC
328  *				       mode
339 		dev_err(&rdev->dev, "invalid suspend target: %d\n",  in mcp16502_suspend_get_target_reg()
343 	return -EINVAL;  in mcp16502_suspend_get_target_reg()
347  * mcp16502_set_suspend_voltage() - regulator_ops set_suspend_voltage
360 	return regmap_update_bits(rdev->regmap, reg, MCP16502_VSEL, sel);  in mcp16502_set_suspend_voltage()
364  * mcp16502_set_suspend_mode() - regulator_ops set_suspend_mode
367 				     unsigned int mode)  in mcp16502_set_suspend_mode()  argument
371 		return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_LPM);  in mcp16502_set_suspend_mode()
374 		return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_HIB);  in mcp16502_set_suspend_mode()
376 		dev_err(&rdev->dev, "invalid suspend target: %d\n",  in mcp16502_set_suspend_mode()
380 	return -EINVAL;  in mcp16502_set_suspend_mode()
384  * mcp16502_set_suspend_enable() - regulator_ops set_suspend_enable
393 	return regmap_update_bits(rdev->regmap, reg, MCP16502_EN, MCP16502_EN);  in mcp16502_set_suspend_enable()
397  * mcp16502_set_suspend_disable() - regulator_ops set_suspend_disable
406 	return regmap_update_bits(rdev->regmap, reg, MCP16502_EN, 0);  in mcp16502_set_suspend_disable()
512 	dev = &client->dev;  in mcp16502_probe()
517 		return -ENOMEM;  in mcp16502_probe()
530 	mcp->lpm = devm_gpiod_get_optional(dev, "lpm", GPIOD_OUT_LOW);  in mcp16502_probe()
531 	if (IS_ERR(mcp->lpm)) {  in mcp16502_probe()
532 		dev_err(dev, "failed to get lpm pin: %ld\n", PTR_ERR(mcp->lpm));  in mcp16502_probe()
533 		return PTR_ERR(mcp->lpm);  in mcp16502_probe()
588 		.name	= "mcp16502-regulator",