linux-kernel - Watchdog reset trigger for eMMC

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Date:	Sat, 30 Apr 2016 11:36:01 +0530
From:	Anand Moon <linux.amoon@...il.com>
To:	Krzysztof Kozłowski <k.kozlowski@...sung.com>,
	Javier Martinez Canillas <javier@....samsung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Watchdog reset trigger for eMMC

Hi All,

Using microSD card when I try to write into /dev/watchdog device
it triggers reboot of the board after timer expires.
-----------------------------------------------------------------------------------------------
root@...oidxu4l:~# echo 3 > /dev/watchdog
[ 1659.021844] watchdog: watchdog0: watchdog did not stop!
root@...oidxu4l:~#
root@...oidxu4l:~#
root@...oidxu4l:~#
root@...oidxu4l:~#
root@...oidxu4l:~#

U-Boot 2016.03-00665-g563d8d9-dirty (Apr 04 2016 - 22:27:07 +0930) for
ODROID-XU
                3

CPU:   Exynos5422 @ 800 MHz
Model: Odroid XU3 based on EXYNOS5422
Board: Odroid XU3 based on EXYNOS5422
Type:  xu4
DRAM:  2 GiB
-----------------------------------------------------------------------------------------------
But when I try this on eMMC it just freezes.
I know we have to set and unset gpio pin (SD_0.RST) to trigger reset
before reboot.
-----------------------------------------------------------------------------------------------
root@...oidxu4e:~# echo 4 > /dev/watchdog
[  639.192617] [c3] watchdog watchdog0: watchdog did not stop!
root@...oidxu4e:~#
root@...oidxu4e:~#
root@...oidxu4e:~#
-----------------------------------------------------------------------------------------------
I would like to know what is way board reset after watchdog reset after timeout.

Best Regards
-Anand Moon