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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2016 Rockchip Electronics Co., Ltd
- *
- * Based on kernel drivers/regulator/pwm-regulator.c
- * Copyright (C) 2014 - STMicroelectronics Inc.
- * Author: Lee Jones <lee.jones@linaro.org>
- */
- #include <common.h>
- #include <dm.h>
- #include <errno.h>
- #include <log.h>
- #include <pwm.h>
- #include <asm/global_data.h>
- #include <dm/device_compat.h>
- #include <power/regulator.h>
- DECLARE_GLOBAL_DATA_PTR;
- struct pwm_regulator_info {
- /* pwm id corresponding to the PWM driver */
- int pwm_id;
- /* the period of one PWM cycle */
- int period_ns;
- /*
- * the polarity of one PWM
- * 0: normal polarity
- * 1: inverted polarity
- */
- bool polarity;
- struct udevice *pwm;
- /* initialize voltage of regulator */
- int init_voltage;
- /* the maximum voltage of regulator */
- int max_voltage;
- /* the minimum voltage of regulator */
- int min_voltage;
- /* the current voltage of regulator */
- int volt_uV;
- };
- static int pwm_regulator_enable(struct udevice *dev, bool enable)
- {
- struct pwm_regulator_info *priv = dev_get_priv(dev);
- return pwm_set_enable(priv->pwm, priv->pwm_id, enable);
- }
- static int pwm_voltage_to_duty_cycle_percentage(struct udevice *dev, int req_uV)
- {
- struct pwm_regulator_info *priv = dev_get_priv(dev);
- int min_uV = priv->min_voltage;
- int max_uV = priv->max_voltage;
- int diff = max_uV - min_uV;
- return ((req_uV * 100) - (min_uV * 100)) / diff;
- }
- static int pwm_regulator_get_voltage(struct udevice *dev)
- {
- struct pwm_regulator_info *priv = dev_get_priv(dev);
- return priv->volt_uV;
- }
- static int pwm_regulator_set_voltage(struct udevice *dev, int uvolt)
- {
- struct pwm_regulator_info *priv = dev_get_priv(dev);
- int duty_cycle;
- int ret = 0;
- duty_cycle = pwm_voltage_to_duty_cycle_percentage(dev, uvolt);
- ret = pwm_set_invert(priv->pwm, priv->pwm_id, priv->polarity);
- if (ret) {
- dev_err(dev, "Failed to init PWM\n");
- return ret;
- }
- ret = pwm_set_config(priv->pwm, priv->pwm_id,
- priv->period_ns, (priv->period_ns / 100) * duty_cycle);
- if (ret) {
- dev_err(dev, "Failed to configure PWM\n");
- return ret;
- }
- priv->volt_uV = uvolt;
- return ret;
- }
- static int pwm_regulator_of_to_plat(struct udevice *dev)
- {
- struct pwm_regulator_info *priv = dev_get_priv(dev);
- struct ofnode_phandle_args args;
- int ret;
- ret = dev_read_phandle_with_args(dev, "pwms", "#pwm-cells", 0, 0, &args);
- if (ret) {
- debug("%s: Cannot get PWM phandle: ret=%d\n", __func__, ret);
- return ret;
- }
- priv->period_ns = args.args[1];
- priv->polarity = args.args[2];
- priv->init_voltage = dev_read_u32_default(dev, "regulator-init-microvolt", -1);
- if (priv->init_voltage < 0) {
- printf("Cannot find regulator pwm init_voltage\n");
- return -EINVAL;
- }
- ret = uclass_get_device_by_ofnode(UCLASS_PWM, args.node, &priv->pwm);
- if (ret) {
- debug("%s: Cannot get PWM: ret=%d\n", __func__, ret);
- return ret;
- }
- return 0;
- }
- static int pwm_regulator_probe(struct udevice *dev)
- {
- struct pwm_regulator_info *priv = dev_get_priv(dev);
- struct dm_regulator_uclass_plat *uc_pdata;
- uc_pdata = dev_get_uclass_plat(dev);
- uc_pdata->type = REGULATOR_TYPE_BUCK;
- uc_pdata->mode_count = 0;
- priv->max_voltage = uc_pdata->max_uV;
- priv->min_voltage = uc_pdata->min_uV;
- if (priv->init_voltage)
- pwm_regulator_set_voltage(dev, priv->init_voltage);
- return 0;
- }
- static const struct dm_regulator_ops pwm_regulator_ops = {
- .get_value = pwm_regulator_get_voltage,
- .set_value = pwm_regulator_set_voltage,
- .set_enable = pwm_regulator_enable,
- };
- static const struct udevice_id pwm_regulator_ids[] = {
- { .compatible = "pwm-regulator" },
- { }
- };
- U_BOOT_DRIVER(pwm_regulator) = {
- .name = "pwm_regulator",
- .id = UCLASS_REGULATOR,
- .ops = &pwm_regulator_ops,
- .probe = pwm_regulator_probe,
- .of_match = pwm_regulator_ids,
- .of_to_plat = pwm_regulator_of_to_plat,
- .priv_auto = sizeof(struct pwm_regulator_info),
- };
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