1 // SPDX-License-Identifier: GPL-2.0-only
36 static int timeout;  variable
37 module_param(timeout, int, 0);
38 MODULE_PARM_DESC(timeout, "Initial watchdog timeout in seconds");
49 	struct sl28cpld_wdt *wdt = watchdog_get_drvdata(wdd);  in sl28cpld_wdt_ping()  local
51 	return regmap_write(wdt->regmap, wdt->offset + WDT_KICK,  in sl28cpld_wdt_ping()
57 	struct sl28cpld_wdt *wdt = watchdog_get_drvdata(wdd);  in sl28cpld_wdt_start()  local
61 	if (wdt->assert_wdt_timeout)  in sl28cpld_wdt_start()
66 	return regmap_update_bits(wdt->regmap, wdt->offset + WDT_CTRL,  in sl28cpld_wdt_start()
72 	struct sl28cpld_wdt *wdt = watchdog_get_drvdata(wdd);  in sl28cpld_wdt_stop()  local
74 	return regmap_update_bits(wdt->regmap, wdt->offset + WDT_CTRL,  in sl28cpld_wdt_stop()
80 	struct sl28cpld_wdt *wdt = watchdog_get_drvdata(wdd);  in sl28cpld_wdt_get_timeleft()  local
84 	ret = regmap_read(wdt->regmap, wdt->offset + WDT_COUNT, &val);  in sl28cpld_wdt_get_timeleft()
92 				    unsigned int timeout)  in sl28cpld_wdt_set_timeout()  argument
94 	struct sl28cpld_wdt *wdt = watchdog_get_drvdata(wdd);  in sl28cpld_wdt_set_timeout()  local
97 	ret = regmap_write(wdt->regmap, wdt->offset + WDT_TIMEOUT, timeout);  in sl28cpld_wdt_set_timeout()
101 	wdd->timeout = timeout;  in sl28cpld_wdt_set_timeout()
123 	struct sl28cpld_wdt *wdt;  in sl28cpld_wdt_probe()  local
128 	if (!pdev->dev.parent)  in sl28cpld_wdt_probe()
129 		return -ENODEV;  in sl28cpld_wdt_probe()
131 	wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);  in sl28cpld_wdt_probe()
132 	if (!wdt)  in sl28cpld_wdt_probe()
133 		return -ENOMEM;  in sl28cpld_wdt_probe()
135 	wdt->regmap = dev_get_regmap(pdev->dev.parent, NULL);  in sl28cpld_wdt_probe()
136 	if (!wdt->regmap)  in sl28cpld_wdt_probe()
137 		return -ENODEV;  in sl28cpld_wdt_probe()
139 	ret = device_property_read_u32(&pdev->dev, "reg", &wdt->offset);  in sl28cpld_wdt_probe()
141 		return -EINVAL;  in sl28cpld_wdt_probe()
143 	wdt->assert_wdt_timeout = device_property_read_bool(&pdev->dev,  in sl28cpld_wdt_probe()
144 							    "kontron,assert-wdt-timeout-pin");  in sl28cpld_wdt_probe()
147 	wdd = &wdt->wdd;  in sl28cpld_wdt_probe()
148 	wdd->parent = &pdev->dev;  in sl28cpld_wdt_probe()
149 	wdd->info = &sl28cpld_wdt_info;  in sl28cpld_wdt_probe()
150 	wdd->ops = &sl28cpld_wdt_ops;  in sl28cpld_wdt_probe()
151 	wdd->min_timeout = 1;  in sl28cpld_wdt_probe()
152 	wdd->max_timeout = 255;  in sl28cpld_wdt_probe()
154 	watchdog_set_drvdata(wdd, wdt);  in sl28cpld_wdt_probe()
161 	ret = regmap_read(wdt->regmap, wdt->offset + WDT_CTRL, &status);  in sl28cpld_wdt_probe()
166 	 * Initial timeout value, may be overwritten by device tree or module  in sl28cpld_wdt_probe()
172 	 * this case gracefully and set out own timeout.  in sl28cpld_wdt_probe()
174 	ret = regmap_read(wdt->regmap, wdt->offset + WDT_TIMEOUT, &val);  in sl28cpld_wdt_probe()
179 		wdd->timeout = val;  in sl28cpld_wdt_probe()
181 		wdd->timeout = WDT_DEFAULT_TIMEOUT;  in sl28cpld_wdt_probe()
183 	watchdog_init_timeout(wdd, timeout, &pdev->dev);  in sl28cpld_wdt_probe()
184 	sl28cpld_wdt_set_timeout(wdd, wdd->timeout);  in sl28cpld_wdt_probe()
197 		set_bit(WDOG_HW_RUNNING, &wdd->status);  in sl28cpld_wdt_probe()
200 	ret = devm_watchdog_register_device(&pdev->dev, wdd);  in sl28cpld_wdt_probe()
202 		dev_err(&pdev->dev, "failed to register watchdog device\n");  in sl28cpld_wdt_probe()
206 	dev_info(&pdev->dev, "initial timeout %d sec%s\n",  in sl28cpld_wdt_probe()
207 		 wdd->timeout, nowayout ? ", nowayout" : "");  in sl28cpld_wdt_probe()
213 	{ .compatible = "kontron,sl28cpld-wdt" },
221 		.name = "sl28cpld-wdt",