watchdog: it87_wdt: add IT8620E ID

This adds IT8620E chip ID to it87_wdt driver.
Such chip is often found on current Gigabyte motherboards, it is allegedly
custom made for this manufacturer.

Upon testing it looks like it has a 16-bit timer and cannot be reset via
game port (only via CIR), so it is similar to IT87{18,20,21,28,83} chips.

Tested on GA-F2A88XM-HD3P board.

Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

2 files changed, 5 insertions, 3 deletions

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index f1de1214f10f..acb00b53a520 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1008,8 +1008,8 @@ config IT87_WDT
         tristate "IT87 Watchdog Timer"
         depends on X86
         ---help---
-          This is the driver for the hardware watchdog on the ITE IT8702,
-          IT8712, IT8716, IT8718, IT8720, IT8721, IT8726 and IT8728
+          This is the driver for the hardware watchdog on the ITE IT8620,
+          IT8702, IT8712, IT8716, IT8718, IT8720, IT8721, IT8726 and IT8728
           Super I/O chips.
 
           If the driver does not work, then make sure that the game port in
diff --git a/drivers/watchdog/it87_wdt.c b/drivers/watchdog/it87_wdt.c
index e54839b12650..b9878c41598f 100644
--- a/drivers/watchdog/it87_wdt.c
+++ b/drivers/watchdog/it87_wdt.c
@@ -12,7 +12,7 @@
  *                  http://www.ite.com.tw/
  *
  *      Support of the watchdog timers, which are available on
- *      IT8702, IT8712, IT8716, IT8718, IT8720, IT8721, IT8726,
+ *      IT8620, IT8702, IT8712, IT8716, IT8718, IT8720, IT8721, IT8726,
  *      IT8728 and IT8783.
  *
  *      This program is free software; you can redistribute it and/or
@@ -78,6 +78,7 @@
 
 /* Chip Id numbers */
 #define NO_DEV_ID       0xffff
+#define IT8620_ID       0x8620
 #define IT8702_ID       0x8702
 #define IT8705_ID       0x8705
 #define IT8712_ID       0x8712
@@ -630,6 +631,7 @@ static int __init it87_wdt_init(void)
         case IT8726_ID:
                 max_units = 65535;
                 break;
+        case IT8620_ID:
         case IT8718_ID:
         case IT8720_ID:
         case IT8721_ID: