+#if defined(CONFIG_OF)
+static int of_at91wdt_init(struct device_node *np, struct at91wdt *wdt)
+{
+ u32 min = 0;
+ u32 max = WDT_COUNTER_MAX_SECS;
+ const char *tmp;
+
+ /* Get the interrupts property */
+ wdt->irq = irq_of_parse_and_map(np, 0);
+ if (!wdt->irq)
+ dev_warn(wdt->wdd.parent, "failed to get IRQ from DT\n");
+
+ if (!of_property_read_u32_index(np, "atmel,max-heartbeat-sec", 0,
+ &max)) {
+ if (!max || max > WDT_COUNTER_MAX_SECS)
+ max = WDT_COUNTER_MAX_SECS;
+
+ if (!of_property_read_u32_index(np, "atmel,min-heartbeat-sec",
+ 0, &min)) {
+ if (min >= max)
+ min = max - 1;
+ }
+ }
+
+ min = secs_to_ticks(min);
+ max = secs_to_ticks(max);
+
+ wdt->mr_mask = 0x3FFFFFFF;
+ wdt->mr = 0;
+ if (!of_property_read_string(np, "atmel,watchdog-type", &tmp) &&
+ !strcmp(tmp, "software")) {
+ wdt->mr |= AT91_WDT_WDFIEN;
+ wdt->mr_mask &= ~AT91_WDT_WDRPROC;
+ } else {
+ wdt->mr |= AT91_WDT_WDRSTEN;
+ }
+
+ if (!of_property_read_string(np, "atmel,reset-type", &tmp) &&
+ !strcmp(tmp, "proc"))
+ wdt->mr |= AT91_WDT_WDRPROC;
+
+ if (of_property_read_bool(np, "atmel,disable")) {
+ wdt->mr |= AT91_WDT_WDDIS;
+ wdt->mr_mask &= AT91_WDT_WDDIS;
+ }
+
+ if (of_property_read_bool(np, "atmel,idle-halt"))
+ wdt->mr |= AT91_WDT_WDIDLEHLT;
+
+ if (of_property_read_bool(np, "atmel,dbg-halt"))
+ wdt->mr |= AT91_WDT_WDDBGHLT;
+
+ wdt->mr |= max | ((max - min) << 16);
+
+ return 0;
+}
+#else
+static inline int of_at91wdt_init(struct device_node *np, struct at91wdt *wdt)
+{
+ return 0;
+}
+#endif