linux-kernel - [PATCH 0/1] stm32_iwdg: set WDOG_HW

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Date:   Thu, 21 Nov 2019 09:28:12 +0100
From:   Christophe Roullier <christophe.roullier@...com>
To:     <wim@...ux-watchdog.org>, <linux@...ck-us.net>,
        <mcoquelin.stm32@...il.com>, <alexandre.torgue@...com>
CC:     <linux-watchdog@...r.kernel.org>, <christophe.roullier@...com>,
        <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH  0/1] stm32_iwdg: set WDOG_HW_RUNNING at probe

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