watchdog: Add watchdog support for W83627DHG chip

The following adds watchdog support for the Winbond W83627DHG chip.
I have tested it on a PQ7-M102XL (Intel Atom) board.

Signed-off-by: Benny Lønstrup Ammitzbøll <benny@ammitzboell-consult.dk>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

2 files changed, 8 insertions, 7 deletions

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index a5ad77ef4266..8a3aa2f050c8 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -722,14 +722,15 @@ config SMSC37B787_WDT
           Most people will say N.
 
 config W83627HF_WDT
-        tristate "W83627HF Watchdog Timer"
+        tristate "W83627HF/W83627DHG Watchdog Timer"
         depends on X86
         ---help---
           This is the driver for the hardware watchdog on the W83627HF chipset
           as used in Advantech PC-9578 and Tyan S2721-533 motherboards
-          (and likely others).  This watchdog simply watches your kernel to
-          make sure it doesn't freeze, and if it does, it reboots your computer
-          after a certain amount of time.
+          (and likely others). The driver also supports the W83627DHG chip.
+          This watchdog simply watches your kernel to make sure it doesn't
+          freeze, and if it does, it reboots your computer after a certain
+          amount of time.
 
           To compile this driver as a module, choose M here: the
           module will be called w83627hf_wdt.
diff --git a/drivers/watchdog/w83627hf_wdt.c b/drivers/watchdog/w83627hf_wdt.c
index 0f5288df0091..48f2e0148bb4 100644
--- a/drivers/watchdog/w83627hf_wdt.c
+++ b/drivers/watchdog/w83627hf_wdt.c
@@ -42,7 +42,7 @@
 
 #include <asm/system.h>
 
-#define WATCHDOG_NAME "w83627hf/thf/hg WDT"
+#define WATCHDOG_NAME "w83627hf/thf/hg/dhg WDT"
 #define PFX WATCHDOG_NAME ": "
 #define WATCHDOG_TIMEOUT 60             /* 60 sec default timeout */
 
@@ -89,7 +89,7 @@ static void w83627hf_select_wd_register(void)
                 c = ((inb_p(WDT_EFDR) & 0xf7) | 0x04); /* select WDT0 */
                 outb_p(0x2b, WDT_EFER);
                 outb_p(c, WDT_EFDR);    /* set GPIO3 to WDT0 */
-        } else if (c == 0x88) { /* W83627EHF */
+        } else if (c == 0x88 || c == 0xa0) {    /* W83627EHF / W83627DHG */
                 outb_p(0x2d, WDT_EFER); /* select GPIO5 */
                 c = inb_p(WDT_EFDR) & ~0x01; /* PIN77 -> WDT0# */
                 outb_p(0x2d, WDT_EFER);
@@ -321,7 +321,7 @@ static int __init wdt_init(void)
 {
         int ret;
 
-        printk(KERN_INFO "WDT driver for the Winbond(TM) W83627HF/THF/HG Super I/O chip initialising.\n");
+        printk(KERN_INFO "WDT driver for the Winbond(TM) W83627HF/THF/HG/DHG Super I/O chip initialising.\n");
 
         if (wdt_set_heartbeat(timeout)) {
                 wdt_set_heartbeat(WATCHDOG_TIMEOUT);