linux-kernel - [PATCH v1] drivers: watchdog: ast2600 support bootstatus

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Date: Thu, 14 Mar 2024 14:57:44 +0800
From: Peter Yin <peteryin.openbmc@...il.com>
To: patrick@...cx.xyz,
	Wim Van Sebroeck <wim@...ux-watchdog.org>,
	Guenter Roeck <linux@...ck-us.net>,
	Joel Stanley <joel@....id.au>,
	Andrew Jeffery <andrew@...econstruct.com.au>,
	linux-watchdog@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-aspeed@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1] drivers: watchdog: ast2600 support bootstatus

Add WDIOF_EXTERN1 bootstatus in ast2600

Signed-off-by: Peter Yin <peteryin.openbmc@...il.com>
---
Change log:

v1
  - Patch 0001 - Add WDIOF_EXTERN1 bootstatus
---
 drivers/watchdog/aspeed_wdt.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c
index b4773a6aaf8c..8adadd394be6 100644
--- a/drivers/watchdog/aspeed_wdt.c
+++ b/drivers/watchdog/aspeed_wdt.c
@@ -81,6 +81,7 @@ MODULE_DEVICE_TABLE(of, aspeed_wdt_of_table);
 #define   WDT_CLEAR_TIMEOUT_AND_BOOT_CODE_SELECTION	BIT(0)
 #define WDT_RESET_MASK1		0x1c
 #define WDT_RESET_MASK2		0x20
+#define   WDT_EVENT_COUNTER_MASK       (0xFFF << 8)
 
 /*
  * WDT_RESET_WIDTH controls the characteristics of the external pulse (if
@@ -459,8 +460,17 @@ static int aspeed_wdt_probe(struct platform_device *pdev)
 	}
 
 	status = readl(wdt->base + WDT_TIMEOUT_STATUS);
-	if (status & WDT_TIMEOUT_STATUS_BOOT_SECONDARY) {
-		wdt->wdd.bootstatus = WDIOF_CARDRESET;
+
+	if (of_device_is_compatible(np, "aspeed,ast2600-wdt")) {
+		if (status & WDT_EVENT_COUNTER_MASK) {
+			/*
+			 * Reset cause by WatchDog
+			 */
+			wdt->wdd.bootstatus |= WDIOF_EXTERN1;
+		}
+	} else {
+		if (status & WDT_TIMEOUT_STATUS_BOOT_SECONDARY)
+			wdt->wdd.bootstatus = WDIOF_CARDRESET;
 
 		if (of_device_is_compatible(np, "aspeed,ast2400-wdt") ||
 		    of_device_is_compatible(np, "aspeed,ast2500-wdt"))
-- 
2.25.1