1 // SPDX-License-Identifier: GPL-2.0-only
6  * Copyright 2024 Ideas on Board Oy
9  * - The .apply() operation executes atomically, but may not wait for the
11  * - Disabling the PWM drives the output pin to a low level immediately.
12  * - The hardware can only generate normal polarity output.
48 static int pwm_adp5585_request(struct pwm_chip *chip, struct pwm_device *pwm)  in pwm_adp5585_request()  argument
50 	struct adp5585_pwm *adp5585_pwm = pwmchip_get_drvdata(chip);  in pwm_adp5585_request()
53 	return regmap_update_bits(adp5585_pwm->regmap, adp5585_pwm->ext_cfg,  in pwm_adp5585_request()
58 static void pwm_adp5585_free(struct pwm_chip *chip, struct pwm_device *pwm)  in pwm_adp5585_free()  argument
60 	struct adp5585_pwm *adp5585_pwm = pwmchip_get_drvdata(chip);  in pwm_adp5585_free()
62 	regmap_update_bits(adp5585_pwm->regmap, adp5585_pwm->ext_cfg,  in pwm_adp5585_free()
67 static int pwm_adp5585_apply(struct pwm_chip *chip,  in pwm_adp5585_apply()  argument
71 	struct adp5585_pwm *adp5585_pwm = pwmchip_get_drvdata(chip);  in pwm_adp5585_apply()
72 	const struct adp5585_pwm_chip *info = adp5585_pwm->info;  in pwm_adp5585_apply()
73 	struct regmap *regmap = adp5585_pwm->regmap;  in pwm_adp5585_apply()
75 	u32 on, off;  in pwm_adp5585_apply()  local
79 	if (!state->enabled) {  in pwm_adp5585_apply()
80 		regmap_clear_bits(regmap, info->pwm_cfg, ADP5585_PWM_EN);  in pwm_adp5585_apply()
84 	if (state->polarity != PWM_POLARITY_NORMAL)  in pwm_adp5585_apply()
85 		return -EINVAL;  in pwm_adp5585_apply()
87 	if (state->period < ADP5585_PWM_MIN_PERIOD_NS)  in pwm_adp5585_apply()
88 		return -EINVAL;  in pwm_adp5585_apply()
90 	period = min(state->period, ADP5585_PWM_MAX_PERIOD_NS);  in pwm_adp5585_apply()
91 	duty_cycle = min(state->duty_cycle, period);  in pwm_adp5585_apply()
94 	 * Compute the on and off time. As the internal oscillator frequency is  in pwm_adp5585_apply()
97 	on = div_u64(duty_cycle, NSEC_PER_SEC / ADP5585_PWM_OSC_FREQ_HZ);  in pwm_adp5585_apply()
98 	off = div_u64(period, NSEC_PER_SEC / ADP5585_PWM_OSC_FREQ_HZ) - on;  in pwm_adp5585_apply()
101 	ret = regmap_bulk_write(regmap, info->pwm_offt_low, &val, 2);  in pwm_adp5585_apply()
105 	val = cpu_to_le16(on);  in pwm_adp5585_apply()
106 	ret = regmap_bulk_write(regmap, info->pwm_ont_low, &val, 2);  in pwm_adp5585_apply()
111 	ret = regmap_update_bits(regmap, info->pwm_cfg,  in pwm_adp5585_apply()
117 	return regmap_set_bits(regmap, info->pwm_cfg, ADP5585_PWM_EN);  in pwm_adp5585_apply()
120 static int pwm_adp5585_get_state(struct pwm_chip *chip,  in pwm_adp5585_get_state()  argument
124 	struct adp5585_pwm *adp5585_pwm = pwmchip_get_drvdata(chip);  in pwm_adp5585_get_state()
125 	const struct adp5585_pwm_chip *info = adp5585_pwm->info;  in pwm_adp5585_get_state()
126 	struct regmap *regmap = adp5585_pwm->regmap;  in pwm_adp5585_get_state()
127 	unsigned int on, off;  in pwm_adp5585_get_state()  local
132 	ret = regmap_bulk_read(regmap, info->pwm_offt_low, &on_off, 2);  in pwm_adp5585_get_state()
137 	ret = regmap_bulk_read(regmap, info->pwm_ont_low, &on_off, 2);  in pwm_adp5585_get_state()
140 	on = le16_to_cpu(on_off);  in pwm_adp5585_get_state()
142 	state->duty_cycle = on * (NSEC_PER_SEC / ADP5585_PWM_OSC_FREQ_HZ);  in pwm_adp5585_get_state()
143 	state->period = (on + off) * (NSEC_PER_SEC / ADP5585_PWM_OSC_FREQ_HZ);  in pwm_adp5585_get_state()
145 	state->polarity = PWM_POLARITY_NORMAL;  in pwm_adp5585_get_state()
147 	regmap_read(regmap, info->pwm_cfg, &val);  in pwm_adp5585_get_state()
148 	state->enabled = !!(val & ADP5585_PWM_EN);  in pwm_adp5585_get_state()
163 	struct device *dev = &pdev->dev;  in adp5585_pwm_probe()
164 	struct adp5585_dev *adp5585 = dev_get_drvdata(dev->parent);  in adp5585_pwm_probe()
166 	struct pwm_chip *chip;  in adp5585_pwm_probe()  local
169 	chip = devm_pwmchip_alloc(dev, ADP5585_PWM_CHAN_NUM,  in adp5585_pwm_probe()
171 	if (IS_ERR(chip))  in adp5585_pwm_probe()
172 		return PTR_ERR(chip);  in adp5585_pwm_probe()
174 	adp5585_pwm = pwmchip_get_drvdata(chip);  in adp5585_pwm_probe()
175 	adp5585_pwm->regmap = adp5585->regmap;  in adp5585_pwm_probe()
176 	adp5585_pwm->ext_cfg = adp5585->regs->ext_cfg;  in adp5585_pwm_probe()
178 	adp5585_pwm->info = (const struct adp5585_pwm_chip *)id->driver_data;  in adp5585_pwm_probe()
179 	if (!adp5585_pwm->info)  in adp5585_pwm_probe()
180 		return -ENODEV;  in adp5585_pwm_probe()
182 	device_set_of_node_from_dev(dev, dev->parent);  in adp5585_pwm_probe()
184 	chip->ops = &adp5585_pwm_ops;  in adp5585_pwm_probe()
186 	ret = devm_pwmchip_add(dev, chip);  in adp5585_pwm_probe()
188 		return dev_err_probe(dev, ret, "failed to add PWM chip\n");  in adp5585_pwm_probe()
206 	{ "adp5585-pwm", (kernel_ulong_t)&adp5585_pwm_chip_info },
207 	{ "adp5589-pwm", (kernel_ulong_t)&adp5589_pwm_chip_info },
214 		.name = "adp5585-pwm",