linux-kernel - Re: [Linux-stm32] [PATCH v2 1/1] drivers: watchdog: stm32_iwdg: set WDOG_HW

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Message-ID: <ea80ec65-8621-453c-4d5b-af38d8afeb70@pengutronix.de>
Date:   Fri, 22 Nov 2019 11:28:47 +0100
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Christophe Roullier <christophe.roullier@...com>,
        wim@...ux-watchdog.org, linux@...ck-us.net,
        mcoquelin.stm32@...il.com, alexandre.torgue@...com
Cc:     linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kernel@...gutronix.de
Subject: Re: [Linux-stm32] [PATCH v2 1/1] drivers: watchdog: stm32_iwdg: set
 WDOG_HW_RUNNING at probe

Hello Christophe,

On 11/22/19 9:24 AM, Christophe Roullier wrote:
> +	/*
> +	 * In case of CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED is set
> +	 * (Means U-Boot/bootloaders leaves the watchdog running)
> +	 * When we get here we should make a decision to prevent
> +	 * any side effects before user space daemon will take care of it.
> +	 * The best option, taking into consideration that there is no
> +	 * way to read values back from hardware, is to enforce watchdog
> +	 * being run with deterministic values.

What about the "ONF: Watchdog enable status bit" in the IWDG_SR register?

Cheers
Ahmad

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