2  * ST Microelectronics SPEAr Pulse Width Modulator driver
4  * Copyright (C) 2012 ST Microelectronics
47  * struct spear_pwm_chip - struct representing pwm chip
67 	return readl_relaxed(chip->mmio_base + (num << 4) + offset);  in spear_pwm_readl()
74 	writel_relaxed(val, chip->mmio_base + (num << 4) + offset);  in spear_pwm_writel()
95 	clk_rate = clk_get_rate(pc->clk);  in spear_pwm_config()
106 			return -EINVAL;  in spear_pwm_config()
114 				return -EINVAL;  in spear_pwm_config()
124 	ret = clk_enable(pc->clk);  in spear_pwm_config()
128 	spear_pwm_writel(pc, pwm->hwpwm, PWMCR,  in spear_pwm_config()
130 	spear_pwm_writel(pc, pwm->hwpwm, PWMDCR, dc);  in spear_pwm_config()
131 	spear_pwm_writel(pc, pwm->hwpwm, PWMPCR, pv);  in spear_pwm_config()
132 	clk_disable(pc->clk);  in spear_pwm_config()
143 	rc = clk_enable(pc->clk);  in spear_pwm_enable()
147 	val = spear_pwm_readl(pc, pwm->hwpwm, PWMCR);  in spear_pwm_enable()
149 	spear_pwm_writel(pc, pwm->hwpwm, PWMCR, val);  in spear_pwm_enable()
159 	val = spear_pwm_readl(pc, pwm->hwpwm, PWMCR);  in spear_pwm_disable()
161 	spear_pwm_writel(pc, pwm->hwpwm, PWMCR, val);  in spear_pwm_disable()
163 	clk_disable(pc->clk);  in spear_pwm_disable()
171 	if (state->polarity != PWM_POLARITY_NORMAL)  in spear_pwm_apply()
172 		return -EINVAL;  in spear_pwm_apply()
174 	if (!state->enabled) {  in spear_pwm_apply()
175 		if (pwm->state.enabled)  in spear_pwm_apply()
180 	err = spear_pwm_config(chip, pwm, state->duty_cycle, state->period);  in spear_pwm_apply()
184 	if (!pwm->state.enabled)  in spear_pwm_apply()
197 	struct device_node *np = pdev->dev.of_node;  in spear_pwm_probe()
202 	pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);  in spear_pwm_probe()
204 		return -ENOMEM;  in spear_pwm_probe()
206 	pc->mmio_base = devm_platform_ioremap_resource(pdev, 0);  in spear_pwm_probe()
207 	if (IS_ERR(pc->mmio_base))  in spear_pwm_probe()
208 		return PTR_ERR(pc->mmio_base);  in spear_pwm_probe()
210 	pc->clk = devm_clk_get(&pdev->dev, NULL);  in spear_pwm_probe()
211 	if (IS_ERR(pc->clk))  in spear_pwm_probe()
212 		return PTR_ERR(pc->clk);  in spear_pwm_probe()
216 	pc->chip.dev = &pdev->dev;  in spear_pwm_probe()
217 	pc->chip.ops = &spear_pwm_ops;  in spear_pwm_probe()
218 	pc->chip.npwm = NUM_PWM;  in spear_pwm_probe()
220 	ret = clk_prepare(pc->clk);  in spear_pwm_probe()
224 	if (of_device_is_compatible(np, "st,spear1340-pwm")) {  in spear_pwm_probe()
225 		ret = clk_enable(pc->clk);  in spear_pwm_probe()
227 			clk_unprepare(pc->clk);  in spear_pwm_probe()
234 		val = readl_relaxed(pc->mmio_base + PWMMCR);  in spear_pwm_probe()
236 		writel_relaxed(val, pc->mmio_base + PWMMCR);  in spear_pwm_probe()
238 		clk_disable(pc->clk);  in spear_pwm_probe()
241 	ret = pwmchip_add(&pc->chip);  in spear_pwm_probe()
243 		clk_unprepare(pc->clk);  in spear_pwm_probe()
244 		dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);  in spear_pwm_probe()
254 	pwmchip_remove(&pc->chip);  in spear_pwm_remove()
257 	clk_unprepare(pc->clk);  in spear_pwm_remove()
261 	{ .compatible = "st,spear320-pwm" },
262 	{ .compatible = "st,spear1340-pwm" },
270 		.name = "spear-pwm",
282 MODULE_ALIAS("platform:spear-pwm");