From mboxrd@z Thu Jan 1 00:00:00 1970 From: linux@roeck-us.net (Guenter Roeck) Date: Fri, 4 Oct 2013 15:30:18 -0700 Subject: [PATCH v5 1/4] watchdog: at91sam9_wdt: better watchdog support In-Reply-To: <1380871455-7324-2-git-send-email-b.brezillon@overkiz.com> References: <1380871455-7324-1-git-send-email-b.brezillon@overkiz.com> <1380871455-7324-2-git-send-email-b.brezillon@overkiz.com> Message-ID: <20131004223018.GA3685@roeck-us.net> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Fri, Oct 04, 2013 at 09:24:12AM +0200, Boris BREZILLON wrote: > The at91sam9 watchdog timer can only be configured once, and the current > implementation tries to configure it in a static way: > - 2 seconds timeout > - wdt restart every 500ms > > If the timer has already been configured with different values, it returns an > error and do not create any watchdog device. > > This is not critical if the watchdog is disabled, but if it has been enabled with > different timeout values it will lead to a SoC reset. > > This patch series tries to address this issue by adapting the heartbeat value > according the WDT timer config: > - it first tries to configure the timer as requested. > - if it fails it fallbacks to the current config, adapting its heartbeat timer > to the needs > > This patch series also move to a dynamically allocated at91wdt device instead > of the static instance. > > It adds a new at91 wdt type: software. This new type make use of the at91 wdt > interrupt to trigger a software reboot. > > Finally it adds several properties to the device tree bindings. > > Signed-off-by: Boris BREZILLON Reviewed-by: Guenter Roeck