1 // SPDX-License-Identifier: GPL-2.0-only
6  * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
11 #include <linux/mfd/atmel-hlcdc.h>
45 	struct atmel_hlcdc *hlcdc = atmel->hlcdc;  in atmel_hlcdc_pwm_apply()
49 	if (state->enabled) {  in atmel_hlcdc_pwm_apply()
50 		struct clk *new_clk = hlcdc->slow_clk;  in atmel_hlcdc_pwm_apply()
51 		u64 pwmcval = state->duty_cycle * 256;  in atmel_hlcdc_pwm_apply()
57 		if (!atmel->errata || !atmel->errata->slow_clk_erratum) {  in atmel_hlcdc_pwm_apply()
60 				return -EINVAL;  in atmel_hlcdc_pwm_apply()
67 		if ((atmel->errata && atmel->errata->slow_clk_erratum) ||  in atmel_hlcdc_pwm_apply()
68 		    clk_period_ns > state->period) {  in atmel_hlcdc_pwm_apply()
69 			new_clk = hlcdc->sys_clk;  in atmel_hlcdc_pwm_apply()
72 				return -EINVAL;  in atmel_hlcdc_pwm_apply()
80 			if (!pres && atmel->errata &&  in atmel_hlcdc_pwm_apply()
81 			    atmel->errata->div1_clk_erratum)  in atmel_hlcdc_pwm_apply()
84 			if ((clk_period_ns << pres) >= state->period)  in atmel_hlcdc_pwm_apply()
89 			return -EINVAL;  in atmel_hlcdc_pwm_apply()
93 		if (new_clk != atmel->cur_clk) {  in atmel_hlcdc_pwm_apply()
101 			clk_disable_unprepare(atmel->cur_clk);  in atmel_hlcdc_pwm_apply()
102 			atmel->cur_clk = new_clk;  in atmel_hlcdc_pwm_apply()
104 			if (new_clk == hlcdc->sys_clk)  in atmel_hlcdc_pwm_apply()
107 			ret = regmap_update_bits(hlcdc->regmap,  in atmel_hlcdc_pwm_apply()
115 		do_div(pwmcval, state->period);  in atmel_hlcdc_pwm_apply()
118 		 * The PWM duty cycle is configurable from 0/256 to 255/256 of  in atmel_hlcdc_pwm_apply()
120 		 * the whole period cycle if we're asked to.  in atmel_hlcdc_pwm_apply()
128 		if (state->polarity == PWM_POLARITY_NORMAL)  in atmel_hlcdc_pwm_apply()
131 		ret = regmap_update_bits(hlcdc->regmap, ATMEL_HLCDC_CFG(6),  in atmel_hlcdc_pwm_apply()
139 		ret = regmap_write(hlcdc->regmap, ATMEL_HLCDC_EN,  in atmel_hlcdc_pwm_apply()
144 		ret = regmap_read_poll_timeout(hlcdc->regmap, ATMEL_HLCDC_SR,  in atmel_hlcdc_pwm_apply()
151 		ret = regmap_write(hlcdc->regmap, ATMEL_HLCDC_DIS,  in atmel_hlcdc_pwm_apply()
156 		ret = regmap_read_poll_timeout(hlcdc->regmap, ATMEL_HLCDC_SR,  in atmel_hlcdc_pwm_apply()
163 		clk_disable_unprepare(atmel->cur_clk);  in atmel_hlcdc_pwm_apply()
164 		atmel->cur_clk = NULL;  in atmel_hlcdc_pwm_apply()
186 	struct pwm_device *pwm = &chip->pwms[0];  in atmel_hlcdc_pwm_suspend()
189 	if (!pwm->state.enabled)  in atmel_hlcdc_pwm_suspend()
190 		clk_disable_unprepare(atmel->hlcdc->periph_clk);  in atmel_hlcdc_pwm_suspend()
199 	struct pwm_device *pwm = &chip->pwms[0];  in atmel_hlcdc_pwm_resume()
202 	/* Re-enable the periph clock it was stopped during suspend. */  in atmel_hlcdc_pwm_resume()
203 	if (!pwm->state.enabled) {  in atmel_hlcdc_pwm_resume()
204 		ret = clk_prepare_enable(atmel->hlcdc->periph_clk);  in atmel_hlcdc_pwm_resume()
209 	return atmel_hlcdc_pwm_apply(chip, pwm, &pwm->state);  in atmel_hlcdc_pwm_resume()
217 		.compatible = "atmel,at91sam9n12-hlcdc",
222 		.compatible = "atmel,at91sam9x5-hlcdc",
226 		.compatible = "atmel,sama5d2-hlcdc",
229 		.compatible = "atmel,sama5d3-hlcdc",
233 		.compatible = "atmel,sama5d4-hlcdc",
236 	{	.compatible = "microchip,sam9x60-hlcdc", },
244 	struct device *dev = &pdev->dev;  in atmel_hlcdc_pwm_probe()
250 	hlcdc = dev_get_drvdata(dev->parent);  in atmel_hlcdc_pwm_probe()
257 	ret = clk_prepare_enable(hlcdc->periph_clk);  in atmel_hlcdc_pwm_probe()
261 	match = of_match_node(atmel_hlcdc_dt_ids, dev->parent->of_node);  in atmel_hlcdc_pwm_probe()
263 		atmel->errata = match->data;  in atmel_hlcdc_pwm_probe()
265 	atmel->hlcdc = hlcdc;  in atmel_hlcdc_pwm_probe()
266 	chip->ops = &atmel_hlcdc_pwm_ops;  in atmel_hlcdc_pwm_probe()
270 		clk_disable_unprepare(hlcdc->periph_clk);  in atmel_hlcdc_pwm_probe()
286 	clk_disable_unprepare(atmel->hlcdc->periph_clk);  in atmel_hlcdc_pwm_remove()
290 	{ .compatible = "atmel,hlcdc-pwm" },
297 		.name = "atmel-hlcdc-pwm",
306 MODULE_ALIAS("platform:atmel-hlcdc-pwm");
307 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");