1 // SPDX-License-Identifier: GPL-2.0+
42 static unsigned int a21_wdt_get_bootstatus(struct a21_wdt_drv *drv)  in a21_wdt_get_bootstatus()  argument
46 	reset |= gpiod_get_value(drv->gpios[GPIO_WD_RST0]) ? (1 << 0) : 0;  in a21_wdt_get_bootstatus()
47 	reset |= gpiod_get_value(drv->gpios[GPIO_WD_RST1]) ? (1 << 1) : 0;  in a21_wdt_get_bootstatus()
48 	reset |= gpiod_get_value(drv->gpios[GPIO_WD_RST2]) ? (1 << 2) : 0;  in a21_wdt_get_bootstatus()
55 	struct a21_wdt_drv *drv = watchdog_get_drvdata(wdt);  in a21_wdt_start()  local
57 	gpiod_set_value(drv->gpios[GPIO_WD_ENAB], 1);  in a21_wdt_start()
64 	struct a21_wdt_drv *drv = watchdog_get_drvdata(wdt);  in a21_wdt_stop()  local
66 	gpiod_set_value(drv->gpios[GPIO_WD_ENAB], 0);  in a21_wdt_stop()
73 	struct a21_wdt_drv *drv = watchdog_get_drvdata(wdt);  in a21_wdt_ping()  local
75 	gpiod_set_value(drv->gpios[GPIO_WD_TRIG], 0);  in a21_wdt_ping()
77 	gpiod_set_value(drv->gpios[GPIO_WD_TRIG], 1);  in a21_wdt_ping()
85 	struct a21_wdt_drv *drv = watchdog_get_drvdata(wdt);  in a21_wdt_set_timeout()  local
88 		dev_err(wdt->parent, "Only 1 and 30 allowed as timeout\n");  in a21_wdt_set_timeout()
89 		return -EINVAL;  in a21_wdt_set_timeout()
92 	if (timeout == 30 && wdt->timeout == 1) {  in a21_wdt_set_timeout()
93 		dev_err(wdt->parent,  in a21_wdt_set_timeout()
95 		return -EINVAL;  in a21_wdt_set_timeout()
99 		gpiod_set_value(drv->gpios[GPIO_WD_FAST], 1);  in a21_wdt_set_timeout()
101 		gpiod_set_value(drv->gpios[GPIO_WD_FAST], 0);  in a21_wdt_set_timeout()
103 	wdt->timeout = timeout;  in a21_wdt_set_timeout()
130 	struct device *dev = &pdev->dev;  in a21_wdt_probe()
131 	struct a21_wdt_drv *drv;  in a21_wdt_probe()  local
137 	drv = devm_kzalloc(dev, sizeof(struct a21_wdt_drv), GFP_KERNEL);  in a21_wdt_probe()
138 	if (!drv)  in a21_wdt_probe()
139 		return -ENOMEM;  in a21_wdt_probe()
145 		return -ENODEV;  in a21_wdt_probe()
156 		drv->gpios[i] = devm_gpiod_get_index(dev, NULL, i, gflags);  in a21_wdt_probe()
157 		if (IS_ERR(drv->gpios[i]))  in a21_wdt_probe()
158 			return PTR_ERR(drv->gpios[i]);  in a21_wdt_probe()
160 		gpiod_set_consumer_name(drv->gpios[i], "MEN A21 Watchdog");  in a21_wdt_probe()
169 			val = gpiod_get_value(drv->gpios[i]);  in a21_wdt_probe()
170 			gpiod_direction_output(drv->gpios[i], val);  in a21_wdt_probe()
176 	watchdog_set_drvdata(&a21_wdt, drv);  in a21_wdt_probe()
179 	reset = a21_wdt_get_bootstatus(drv);  in a21_wdt_probe()
180 	if (reset == 2)  in a21_wdt_probe()
189 	drv->wdt = a21_wdt;  in a21_wdt_probe()
190 	dev_set_drvdata(dev, drv);  in a21_wdt_probe()
203 	struct a21_wdt_drv *drv = dev_get_drvdata(&pdev->dev);  in a21_wdt_shutdown()  local
205 	gpiod_set_value(drv->gpios[GPIO_WD_ENAB], 0);  in a21_wdt_shutdown()
209 	{ .compatible = "men,a021-wdt" },
218 		.name = "a21-watchdog",
228 MODULE_ALIAS("platform:a21-watchdog");