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From: Christophe Roullier <christophe.roullier@st.com>
To: <wim@linux-watchdog.org>, <linux@roeck-us.net>,
	<mcoquelin.stm32@gmail.com>, <alexandre.torgue@st.com>
Cc: <linux-watchdog@vger.kernel.org>, <christophe.roullier@st.com>,
	<linux-kernel@vger.kernel.org>,
	<linux-stm32@st-md-mailman.stormreply.com>,
	<linux-arm-kernel@lists.infradead.org>
Subject: [PATCH  0/1] stm32_iwdg: set WDOG_HW_RUNNING at probe
Date: Thu, 21 Nov 2019 09:28:12 +0100
Message-ID: <20191121082813.29267-1-christophe.roullier@st.com> (raw)

If the watchdog hardware is already enabled during the boot process,
when the Linux watchdog driver loads, it should reset the watchdog and
tell the watchdog framework. As a result, ping can be generated from
the watchdog framework (if CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED is set),
until the userspace watchdog daemon takes over control

Verified :
Watchdog enable in Uboot + HANDLE_BOOT_ENABLE is not set + daemon watchdog in userland ON ==> No reset IWDG2
Watchdog enable in Uboot + HANDLE_BOOT_ENABLE is not set ==> Reset IWDG2
Watchdog enable in Uboot + HANDLE_BOOT_ENABLE=y ==> No reset IWDG2
Watchdog enable in Uboot + HANDLE_BOOT_ENABLE=y + daemon watchdog in userland ON puis OFF ==> Reset IWDG2
Watchdog disable in Uboot + HANDLE_BOOT_ENABLE is not set ==> No reset IWDG2
Watchdog disable in Uboot + HANDLE_BOOT_ENABLE=y ==> No reset IWDG2
Watchdog disable in Uboot + HANDLE_BOOT_ENABLE=y + daemon watchdog in userland ON ==> No reset IWDG2
Watchdog disable in Uboot + HANDLE_BOOT_ENABLE=y + daemon watchdog in userland ON puis OFF ==> Reset IWDG2

Christophe Roullier (1):
  drivers: watchdog: stm32_iwdg: set WDOG_HW_RUNNING at probe

 drivers/watchdog/stm32_iwdg.c | 57 ++++++++++++++++++++++++-----------
 1 file changed, 40 insertions(+), 17 deletions(-)

-- 
2.17.1


             reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-21  8:28 Christophe Roullier [this message]
2019-11-21  8:28 ` [PATCH 1/1] drivers: watchdog: " Christophe Roullier
2019-11-21  9:53   ` Guenter Roeck
2019-11-21 13:45     ` Christophe ROULLIER
2019-11-21 14:21       ` Guenter Roeck

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