1 // SPDX-License-Identifier: GPL-2.0-or-later
9  *   platform device ep93xx-pwm.1 - PWMOUT1 (EGPIO14)
12  *   platform device ep93xx-pwm.0 - PWMOUT
15  *   platform device ep93xx-pwm.0 - PWMOUT
16  *   platform device ep93xx-pwm.1 - PWMOUT1 (EGPIO14)
50 	bool enabled = state->enabled;  in ep93xx_pwm_apply()
51 	void __iomem *base = ep93xx_pwm->base;  in ep93xx_pwm_apply()
52 	unsigned long long c;  in ep93xx_pwm_apply()
53 	unsigned long period_cycles;  in ep93xx_pwm_apply()
54 	unsigned long duty_cycles;  in ep93xx_pwm_apply()
55 	unsigned long term;  in ep93xx_pwm_apply()  local
57 	if (state->polarity != pwm->state.polarity) {  in ep93xx_pwm_apply()
59 			writew(0x0, ep93xx_pwm->base + EP93XX_PWMx_ENABLE);  in ep93xx_pwm_apply()
60 			clk_disable_unprepare(ep93xx_pwm->clk);  in ep93xx_pwm_apply()
68 		ret = clk_prepare_enable(ep93xx_pwm->clk);  in ep93xx_pwm_apply()
72 		if (state->polarity == PWM_POLARITY_INVERSED)  in ep93xx_pwm_apply()
73 			writew(0x1, ep93xx_pwm->base + EP93XX_PWMx_INVERT);  in ep93xx_pwm_apply()
75 			writew(0x0, ep93xx_pwm->base + EP93XX_PWMx_INVERT);  in ep93xx_pwm_apply()
77 		clk_disable_unprepare(ep93xx_pwm->clk);  in ep93xx_pwm_apply()
80 	if (!state->enabled) {  in ep93xx_pwm_apply()
82 			writew(0x0, ep93xx_pwm->base + EP93XX_PWMx_ENABLE);  in ep93xx_pwm_apply()
83 			clk_disable_unprepare(ep93xx_pwm->clk);  in ep93xx_pwm_apply()
94 		ret = clk_prepare_enable(ep93xx_pwm->clk);  in ep93xx_pwm_apply()
99 	c = clk_get_rate(ep93xx_pwm->clk);  in ep93xx_pwm_apply()
100 	c *= state->period;  in ep93xx_pwm_apply()
105 	c *= state->duty_cycle;  in ep93xx_pwm_apply()
106 	do_div(c, state->period);  in ep93xx_pwm_apply()
110 		term = readw(base + EP93XX_PWMx_TERM_COUNT);  in ep93xx_pwm_apply()
113 		if (period_cycles > term) {  in ep93xx_pwm_apply()
122 		ret = -EINVAL;  in ep93xx_pwm_apply()
126 		clk_disable_unprepare(ep93xx_pwm->clk);  in ep93xx_pwm_apply()
132 		ret = clk_prepare_enable(ep93xx_pwm->clk);  in ep93xx_pwm_apply()
136 		writew(0x1, ep93xx_pwm->base + EP93XX_PWMx_ENABLE);  in ep93xx_pwm_apply()
152 	chip = devm_pwmchip_alloc(&pdev->dev, 1, sizeof(*ep93xx_pwm));  in ep93xx_pwm_probe()
157 	ep93xx_pwm->base = devm_platform_ioremap_resource(pdev, 0);  in ep93xx_pwm_probe()
158 	if (IS_ERR(ep93xx_pwm->base))  in ep93xx_pwm_probe()
159 		return PTR_ERR(ep93xx_pwm->base);  in ep93xx_pwm_probe()
161 	ep93xx_pwm->clk = devm_clk_get(&pdev->dev, "pwm_clk");  in ep93xx_pwm_probe()
162 	if (IS_ERR(ep93xx_pwm->clk))  in ep93xx_pwm_probe()
163 		return PTR_ERR(ep93xx_pwm->clk);  in ep93xx_pwm_probe()
165 	chip->ops = &ep93xx_pwm_ops;  in ep93xx_pwm_probe()
167 	ret = devm_pwmchip_add(&pdev->dev, chip);  in ep93xx_pwm_probe()
175 	{ .compatible = "cirrus,ep9301-pwm" },
182 		.name = "ep93xx-pwm",
192 MODULE_ALIAS("platform:ep93xx-pwm");