5  * SPDX-License-Identifier:	GPL-2.0+
11 #include <pwm.h>
20 	struct udevice *pwm;  member
36 	if (priv->reg) {  in pwm_backlight_enable()
37 		plat = dev_get_uclass_platdata(priv->reg);  in pwm_backlight_enable()
39 		      dev->name, priv->reg->name, plat->name);  in pwm_backlight_enable()
40 		ret = regulator_set_enable(priv->reg, true);  in pwm_backlight_enable()
42 			debug("%s: Cannot enable regulator for PWM '%s'\n",  in pwm_backlight_enable()
43 			      __func__, dev->name);  in pwm_backlight_enable()
49 	ret = pwm_set_invert(priv->pwm, priv->channel, priv->polarity);  in pwm_backlight_enable()
51 		dev_err(dev, "Failed to invert PWM\n");  in pwm_backlight_enable()
55 	duty_cycle = priv->period_ns * (priv->default_level - priv->min_level) /  in pwm_backlight_enable()
56 		(priv->max_level - priv->min_level + 1);  in pwm_backlight_enable()
57 	ret = pwm_set_config(priv->pwm, priv->channel, priv->period_ns,  in pwm_backlight_enable()
61 	ret = pwm_set_enable(priv->pwm, priv->channel, true);  in pwm_backlight_enable()
66 	if (dm_gpio_is_valid(&priv->enable))  in pwm_backlight_enable()
67 		dm_gpio_set_value(&priv->enable, 1);  in pwm_backlight_enable()
78 	ret = pwm_set_config(priv->pwm, priv->channel, priv->period_ns, 0);  in pwm_backlight_disable()
83 	 * Sometimes there is not "enable-gpios", we have to set pwm output  in pwm_backlight_disable()
84 	 * 0% or 100% duty to play role like "enable-gpios", so we should not  in pwm_backlight_disable()
85 	 * disable pwm, let's keep it enabled.  in pwm_backlight_disable()
87 	if (dm_gpio_is_valid(&priv->enable)) {  in pwm_backlight_disable()
88 		ret = pwm_set_enable(priv->pwm, priv->channel, false);  in pwm_backlight_disable()
94 	if (dm_gpio_is_valid(&priv->enable))  in pwm_backlight_disable()
95 		dm_gpio_set_value(&priv->enable, 0);  in pwm_backlight_disable()
97 	if (priv->reg) {  in pwm_backlight_disable()
98 		plat = dev_get_uclass_platdata(priv->reg);  in pwm_backlight_disable()
100 		      dev->name, priv->reg->name, plat->name);  in pwm_backlight_disable()
101 		ret = regulator_set_enable(priv->reg, false);  in pwm_backlight_disable()
103 			debug("%s: Cannot enable regulator for PWM '%s'\n",  in pwm_backlight_disable()
104 			      __func__, dev->name);  in pwm_backlight_disable()
121 					   "power-supply", &priv->reg);  in pwm_backlight_ofdata_to_platdata()
124 	ret = gpio_request_by_name(dev, "enable-gpios", 0, &priv->enable,  in pwm_backlight_ofdata_to_platdata()
129 		if (ret != -ENOENT)  in pwm_backlight_ofdata_to_platdata()
132 	ret = dev_read_phandle_with_args(dev, "pwms", "#pwm-cells", 0, 0,  in pwm_backlight_ofdata_to_platdata()
135 		debug("%s: Cannot get PWM phandle: ret=%d\n", __func__, ret);  in pwm_backlight_ofdata_to_platdata()
139 	ret = uclass_get_device_by_ofnode(UCLASS_PWM, args.node, &priv->pwm);  in pwm_backlight_ofdata_to_platdata()
141 		debug("%s: Cannot get PWM: ret=%d\n", __func__, ret);  in pwm_backlight_ofdata_to_platdata()
144 	priv->channel = args.args[0];  in pwm_backlight_ofdata_to_platdata()
145 	priv->period_ns = args.args[1];  in pwm_backlight_ofdata_to_platdata()
146 	priv->polarity = args.args[2];  in pwm_backlight_ofdata_to_platdata()
148 	index = dev_read_u32_default(dev, "default-brightness-level", 255);  in pwm_backlight_ofdata_to_platdata()
149 	cell = dev_read_prop(dev, "brightness-levels", &len);  in pwm_backlight_ofdata_to_platdata()
152 		priv->default_level = fdt32_to_cpu(cell[index]);  in pwm_backlight_ofdata_to_platdata()
153 		priv->max_level = fdt32_to_cpu(cell[count - 1]);  in pwm_backlight_ofdata_to_platdata()
155 		if(fdt32_to_cpu(cell[0]) > priv->max_level)  in pwm_backlight_ofdata_to_platdata()
156 			priv->max_level = fdt32_to_cpu(cell[0]);  in pwm_backlight_ofdata_to_platdata()
158 		priv->default_level = index;  in pwm_backlight_ofdata_to_platdata()
159 		priv->max_level = 255;  in pwm_backlight_ofdata_to_platdata()
178 	{ .compatible = "pwm-backlight" },