watchdog: pnx4008: add support for soft reset

Add support for explicit soft reset using the reboot mode.

The default reboot mode behavior is unchanged;
you can overwrite the default reboot type in the board specific file
"DT_MACHINE_START" definition using the "reboot_mode" parameter.

Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 10 insertions, 3 deletions

diff --git a/drivers/watchdog/pnx4008_wdt.c b/drivers/watchdog/pnx4008_wdt.c
index f3be522986b6..51be66e8a473 100644
--- a/drivers/watchdog/pnx4008_wdt.c
+++ b/drivers/watchdog/pnx4008_wdt.c
@@ -129,9 +129,16 @@ static int pnx4008_wdt_set_timeout(struct watchdog_device *wdd,
 static int pnx4008_restart_handler(struct watchdog_device *wdd,
                                    unsigned long mode, void *cmd)
 {
-        /* Instant assert of RESETOUT_N with pulse length 1mS */
-        writel(13000, WDTIM_PULSE(wdt_base));
-        writel(M_RES2 | RESFRC1 | RESFRC2, WDTIM_MCTRL(wdt_base));
+        if (mode == REBOOT_SOFT) {
+                /* Force match output active */
+                writel(EXT_MATCH0, WDTIM_EMR(wdt_base));
+                /* Internal reset on match output (RESOUT_N not asserted) */
+                writel(M_RES1, WDTIM_MCTRL(wdt_base));
+        } else {
+                /* Instant assert of RESETOUT_N with pulse length 1mS */
+                writel(13000, WDTIM_PULSE(wdt_base));
+                writel(M_RES2 | RESFRC1 | RESFRC2, WDTIM_MCTRL(wdt_base));
+        }
 
         /* Wait for watchdog to reset system */
         mdelay(1000);