1 // SPDX-License-Identifier: GPL-2.0+
5  * Based on kernel drivers/regulator/pwm-regulator.c
6  * Copyright (C) 2014 - STMicroelectronics Inc.
13 #include <pwm.h>
14 #include <power/regulator.h>
19 	/* pwm id corresponding to the PWM driver */
21 	/* the period of one PWM cycle */
24 	 * the polarity of one PWM
29 	struct udevice *pwm;  member
30 	/* initialize voltage of regulator */
32 	/* the maximum voltage of regulator */
34 	/* the minimum voltage of regulator */
36 	/* the current voltage of regulator */
44 	return pwm_set_enable(priv->pwm, priv->pwm_id, enable);  in pwm_regulator_enable()
50 	int min_uV = priv->min_voltage;  in pwm_voltage_to_duty_cycle_percentage()
51 	int max_uV = priv->max_voltage;  in pwm_voltage_to_duty_cycle_percentage()
52 	int diff = max_uV - min_uV;  in pwm_voltage_to_duty_cycle_percentage()
54 	return ((req_uV * 100) - (min_uV * 100)) / diff;  in pwm_voltage_to_duty_cycle_percentage()
61 	return priv->volt_uV;  in pwm_regulator_get_voltage()
72 	ret = pwm_set_invert(priv->pwm, priv->pwm_id, priv->polarity);  in pwm_regulator_set_voltage()
74 		dev_err(dev, "Failed to init PWM\n");  in pwm_regulator_set_voltage()
78 	ret = pwm_set_config(priv->pwm, priv->pwm_id,  in pwm_regulator_set_voltage()
79 			priv->period_ns, (priv->period_ns / 100) * duty_cycle);  in pwm_regulator_set_voltage()
81 		dev_err(dev, "Failed to configure PWM\n");  in pwm_regulator_set_voltage()
85 	priv->volt_uV = uvolt;  in pwm_regulator_set_voltage()
96 	ret = dev_read_phandle_with_args(dev, "pwms", "#pwm-cells", 0, 0, &args);  in pwm_regulator_ofdata_to_platdata()
98 		debug("%s: Cannot get PWM phandle: ret=%d\n", __func__, ret);  in pwm_regulator_ofdata_to_platdata()
102 	priv->period_ns = args.args[1];  in pwm_regulator_ofdata_to_platdata()
103 	priv->polarity = args.args[2];  in pwm_regulator_ofdata_to_platdata()
105 	priv->init_voltage = dev_read_u32_default(dev, "regulator-init-microvolt", -1);  in pwm_regulator_ofdata_to_platdata()
106 	if (priv->init_voltage < 0) {  in pwm_regulator_ofdata_to_platdata()
107 		printf("Cannot find regulator pwm init_voltage\n");  in pwm_regulator_ofdata_to_platdata()
108 		return -EINVAL;  in pwm_regulator_ofdata_to_platdata()
111 	ret = uclass_get_device_by_ofnode(UCLASS_PWM, args.node, &priv->pwm);  in pwm_regulator_ofdata_to_platdata()
113 		debug("%s: Cannot get PWM: ret=%d\n", __func__, ret);  in pwm_regulator_ofdata_to_platdata()
127 	uc_pdata->type = REGULATOR_TYPE_BUCK;  in pwm_regulator_probe()
128 	uc_pdata->mode_count = 0;  in pwm_regulator_probe()
129 	priv->max_voltage = uc_pdata->max_uV;  in pwm_regulator_probe()
130 	priv->min_voltage = uc_pdata->min_uV;  in pwm_regulator_probe()
132 	if (priv->init_voltage)  in pwm_regulator_probe()
133 		pwm_regulator_set_voltage(dev, priv->init_voltage);  in pwm_regulator_probe()
145 	{ .compatible = "pwm-regulator" },