7  * Based on drivers/pwm/pwm-tegra.c, Copyright (c) 2010, NVIDIA Corporation
19 #include <linux/pwm.h>
23 /* PWM registers */
43  * PWM period is specified with a timebase register,
44  * in number of step periods. The PWM duty cycle is also
49  * Imposing a minimum timebase, will impose a maximum PWM frequency.
92 static int img_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,  in img_pwm_config()  argument
138 	val &= ~(PWM_CTRL_CFG_DIV_MASK << PWM_CTRL_CFG_DIV_SHIFT(pwm->hwpwm));  in img_pwm_config()
140 		PWM_CTRL_CFG_DIV_SHIFT(pwm->hwpwm);  in img_pwm_config()
145 	img_pwm_writel(pwm_chip, PWM_CH_CFG(pwm->hwpwm), val);  in img_pwm_config()
153 static int img_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)  in img_pwm_enable()  argument
164 	val |= BIT(pwm->hwpwm);  in img_pwm_enable()
169 			   PERIP_PWM_PDM_CONTROL_CH_SHIFT(pwm->hwpwm), 0);  in img_pwm_enable()
174 static void img_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)  in img_pwm_disable()  argument
180 	val &= ~BIT(pwm->hwpwm);  in img_pwm_disable()
200 		.compatible = "img,pistachio-pwm",
230 		dev_err(dev, "could not prepare or enable pwm clock\n");  in img_pwm_runtime_resume()
243 	struct img_pwm_chip *pwm;  in img_pwm_probe()  local
246 	pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);  in img_pwm_probe()
247 	if (!pwm)  in img_pwm_probe()
250 	pwm->dev = &pdev->dev;  in img_pwm_probe()
252 	pwm->base = devm_platform_ioremap_resource(pdev, 0);  in img_pwm_probe()
253 	if (IS_ERR(pwm->base))  in img_pwm_probe()
254 		return PTR_ERR(pwm->base);  in img_pwm_probe()
259 	pwm->data = of_dev_id->data;  in img_pwm_probe()
261 	pwm->periph_regs = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,  in img_pwm_probe()
263 	if (IS_ERR(pwm->periph_regs))  in img_pwm_probe()
264 		return PTR_ERR(pwm->periph_regs);  in img_pwm_probe()
266 	pwm->sys_clk = devm_clk_get(&pdev->dev, "sys");  in img_pwm_probe()
267 	if (IS_ERR(pwm->sys_clk)) {  in img_pwm_probe()
269 		return PTR_ERR(pwm->sys_clk);  in img_pwm_probe()
272 	pwm->pwm_clk = devm_clk_get(&pdev->dev, "pwm");  in img_pwm_probe()
273 	if (IS_ERR(pwm->pwm_clk)) {  in img_pwm_probe()
274 		dev_err(&pdev->dev, "failed to get pwm clock\n");  in img_pwm_probe()
275 		return PTR_ERR(pwm->pwm_clk);  in img_pwm_probe()
278 	platform_set_drvdata(pdev, pwm);  in img_pwm_probe()
289 	clk_rate = clk_get_rate(pwm->pwm_clk);  in img_pwm_probe()
291 		dev_err(&pdev->dev, "pwm clock has no frequency\n");  in img_pwm_probe()
297 	val = (u64)NSEC_PER_SEC * 512 * pwm->data->max_timebase;  in img_pwm_probe()
299 	pwm->max_period_ns = val;  in img_pwm_probe()
303 	pwm->min_period_ns = val;  in img_pwm_probe()
305 	pwm->chip.dev = &pdev->dev;  in img_pwm_probe()
306 	pwm->chip.ops = &img_pwm_ops;  in img_pwm_probe()
307 	pwm->chip.npwm = IMG_PWM_NPWM;  in img_pwm_probe()
309 	ret = pwmchip_add(&pwm->chip);  in img_pwm_probe()
402 		.name = "img-pwm",
412 MODULE_DESCRIPTION("Imagination Technologies PWM DAC driver");