watchdog: ziirave_wdt: Be more verbose during firmware update

Add more error logging to ziirave_firm_upload() for diagnostics.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Rick Ramstetter <rick@anteaterllc.com>
Cc: linux-watchdog@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20190812200906.31344-4-andrew.smirnov@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

drivers/watchdog/ziirave_wdt.c

@@ -335,14 +335,18 @@ static int ziirave_firm_upload(struct watchdog_device *wdd,
 
 	ret = ziirave_firm_write_byte(wdd, ZIIRAVE_CMD_JUMP_TO_BOOTLOADER, 1,
 				      false);
-	if (ret)
+	if (ret) {
+		dev_err(&client->dev, "Failed to jump to bootloader\n");
 		return ret;
+	}
 
 	msleep(500);
 
 	ret = ziirave_firm_write_byte(wdd, ZIIRAVE_CMD_DOWNLOAD_START, 1, true);
-	if (ret)
+	if (ret) {
+		dev_err(&client->dev, "Failed to start download\n");
 		return ret;
+	}
 
 	msleep(500);
 
@@ -438,14 +442,20 @@ static int ziirave_firm_upload(struct watchdog_device *wdd,
 
 	/* End download operation */
 	ret = ziirave_firm_write_byte(wdd, ZIIRAVE_CMD_DOWNLOAD_END, 1, false);
-	if (ret)
+	if (ret) {
+		dev_err(&client->dev,
+			"Failed to end firmware download: %d\n", ret);
 		return ret;
+	}
 
 	/* Reset the processor */
 	ret = ziirave_firm_write_byte(wdd, ZIIRAVE_CMD_RESET_PROCESSOR, 1,
 				      false);
-	if (ret)
+	if (ret) {
+		dev_err(&client->dev,
+			"Failed to reset the watchdog: %d\n", ret);
 		return ret;
+	}
 
 	msleep(500);