[PATCH v7 3/6] watchdog: pnx4008: add support for soft reset

[Sylvain Lemieux]

From: Sylvain Lemieux <slemieux at tycoint.com>

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 at tycoint.com>
Reviewed-by: Guenter Roeck <linux at roeck-us.net>
---
Changes from v6 to v7:
- Added Reviewed-by from v6.

Changes from v5 to v6:
- remove typecast.

Changes from v4 to v5:
- no logical change; updated to work with new revision of patch #2.

Changes from v3 to v4:
- none.

Changes from v2 to v3:
- no logical change; updated to work with new revision of patch #2.

Changes from v1 to v2:
- Rename patch title;
  was "arm: lpc32xx: restart: add support for soft reset"
- Add change to "pnx-4008" driver instead of "mach-lpc32xx".
- Use define available in "pnx-4008" when writting to watchdog register.

 drivers/watchdog/pnx4008_wdt.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/watchdog/pnx4008_wdt.c b/drivers/watchdog/pnx4008_wdt.c
index f3be522..51be66e 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);
-- 
1.8.3.1