1 // SPDX-License-Identifier: GPL-2.0+
19 #include <linux/mfd/syscon/atmel-st.h>
32 #define WDT_MAX_TIME		256	/* seconds */
109 		return -EBUSY;  in at91_wdt_open()
136 	 * All counting occurs at SLOW_CLOCK / 128 = 256 Hz  in at91_wdt_settimeout()
138 	 * Since WDV is a 16-bit counter, the maximum period is  in at91_wdt_settimeout()
139 	 * 65536 / 256 = 256 seconds.  in at91_wdt_settimeout()
142 		return -EINVAL;  in at91_wdt_settimeout()
156  * Handle commands from user-space.
162 	int __user *p = argp;  in at91_wdt_ioctl()  local
168 				sizeof(at91_wdt_info)) ? -EFAULT : 0;  in at91_wdt_ioctl()
171 		return put_user(0, p);  in at91_wdt_ioctl()
173 		if (get_user(new_value, p))  in at91_wdt_ioctl()
174 			return -EFAULT;  in at91_wdt_ioctl()
184 		if (get_user(new_value, p))  in at91_wdt_ioctl()
185 			return -EFAULT;  in at91_wdt_ioctl()
187 			return -EINVAL;  in at91_wdt_ioctl()
191 		return put_user(wdt_time, p);  in at91_wdt_ioctl()
193 		return put_user(wdt_time, p);  in at91_wdt_ioctl()
195 		return -ENOTTY;  in at91_wdt_ioctl()
229 	struct device *dev = &pdev->dev;  in at91wdt_probe()
234 		return -EBUSY;  in at91wdt_probe()
235 	at91wdt_miscdev.parent = &pdev->dev;  in at91wdt_probe()
237 	parent = dev->parent;  in at91wdt_probe()
240 		return -ENODEV;  in at91wdt_probe()
243 	regmap_st = syscon_node_to_regmap(parent->of_node);  in at91wdt_probe()
245 		return -ENODEV;  in at91wdt_probe()
262 	struct device *dev = &pdev->dev;  in at91wdt_remove()
292 	{ .compatible = "atmel,at91rm9200-wdt" },
315 		pr_info("wdt_time value must be 1 <= wdt_time <= 256, using %d\n",  in at91_wdt_init()