platform_data/mlxreg: support new watchdog type with longer timeout period

Add new watchdog type 3 with longer timeout period.
Extend size of health_cntr field that that can be used to init watchdog
timeout period.
Signed-off-by: Michael Shych <michaelsh@mellanox.com>
Reviewed-by: Vadim Pasternak <vadimp@mellanox.com>
Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20200504141427.17685-2-michaelsh@mellanox.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

include/linux/platform_data/mlxreg.h

@@ -43,10 +43,13 @@
  *
  * TYPE1 HW watchdog implementation exist in old systems.
  * All new systems have TYPE2 HW watchdog.
+ * TYPE3 HW watchdog can exist on all systems with new CPLD.
+ * TYPE3 is selected by WD capability bit.
  */
 enum mlxreg_wdt_type {
 	MLX_WDT_TYPE1,
 	MLX_WDT_TYPE2,
+	MLX_WDT_TYPE3,
 };
 
 /**
@@ -90,7 +93,7 @@ struct mlxreg_core_data {
 	umode_t	mode;
 	struct device_node *np;
 	struct mlxreg_hotplug_device hpdev;
-	u8 health_cntr;
+	u32 health_cntr;
 	bool attached;
 };