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From: Markus Pargmann <mpa@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH v2 2/2] wdog: imx-wd: Disable watchdog powerdown counter
Date: Thu,  9 Apr 2015 15:31:56 +0200	[thread overview]
Message-ID: <1428586316-17722-2-git-send-email-mpa@pengutronix.de> (raw)
In-Reply-To: <1428586316-17722-1-git-send-email-mpa@pengutronix.de>

Disable the watchdog powerdown counter at start. Otherwise this may
trigger a reset or poweroff over the WDOG_B line to a PMIC. This counter
is set to 16 seconds after poweron.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
---
 drivers/watchdog/imxwd.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/watchdog/imxwd.c b/drivers/watchdog/imxwd.c
index 6e9edd9d81cf..221ad93107f4 100644
--- a/drivers/watchdog/imxwd.c
+++ b/drivers/watchdog/imxwd.c
@@ -46,6 +46,7 @@ struct imx_wd {
 #define IMX21_WDOG_WCR	0x00 /* Watchdog Control Register */
 #define IMX21_WDOG_WSR	0x02 /* Watchdog Service Register */
 #define IMX21_WDOG_WSTR	0x04 /* Watchdog Status Register  */
+#define IMX21_WDOG_WMCR	0x08 /* Misc Register */
 #define IMX21_WDOG_WCR_WDE	(1 << 2)
 #define IMX21_WDOG_WCR_SRS	(1 << 4)
 #define IMX21_WDOG_WCR_WDA	(1 << 5)
@@ -158,6 +159,11 @@ static int imx21_wd_init(struct imx_wd *priv)
 {
 	imx_watchdog_detect_reset_source(priv);
 
+	/*
+	 * Disable watchdog powerdown counter
+	 */
+	writew(0x0, priv->base + IMX21_WDOG_WMCR);
+
 	return 0;
 }
 
-- 
2.1.4


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  reply	other threads:[~2015-04-09 13:32 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-09 13:31 [PATCH v2 1/2] wdog: imx-wd: Introduce ops struct for imx21/imx1 Markus Pargmann
2015-04-09 13:31 ` Markus Pargmann [this message]
2015-04-13  6:36 ` Sascha Hauer

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