linux-kernel - Re: [PATCH 2/2] watchdog: BD70528: conditionally allow BD70528 module

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Message-ID: <20210107151254.GB13040@roeck-us.net>
Date:   Thu, 7 Jan 2021 07:12:54 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc:     mazziesaccount@...il.com,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-power@...rohmeurope.com, linux-watchdog@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] watchdog: BD70528: conditionally allow BD70528 module

On Thu, Jan 07, 2021 at 08:37:25AM +0200, Matti Vaittinen wrote:
> The BD70528 watchdog module provides start/stop interface for RTC
> driver because the BD70528 watchdog must be stopped when RTC time
> is set. (WDG uses RTC counter and setting RTC may accidentally trigger
> WDG if WDG is enabled). The BD71828 use same RTC driver as BD70528 but
> don't share same WDG logic. When BD70528 is not configured a stub call
> to "stop WDG" is implemented and in case when BD71828 is used, this
> stub function should be called. Prevent configuring in the BD70528
> watchdog when BD71828 is configured to avoid access to real WDG
> functions when WDG does not exist in HW.
> 
> Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>

As mentioned in my response to the other patch, I think this is the
wrong solution.

Guenter

> ---
>  drivers/watchdog/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index fd7968635e6d..40e1b4c69537 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -163,6 +163,7 @@ config SOFT_WATCHDOG_PRETIMEOUT
>  config BD70528_WATCHDOG
>  	tristate "ROHM BD70528 PMIC Watchdog"
>  	depends on MFD_ROHM_BD70528
> +	depends on MFD_ROHM_BD71828 = n
>  	select WATCHDOG_CORE
>  	help
>  	  Support for the watchdog in the ROHM BD70528 PMIC. Watchdog trigger
> -- 
> 2.25.4
> 
> 
> -- 
> Matti Vaittinen, Linux device drivers
> ROHM Semiconductors, Finland SWDC
> Kiviharjunlenkki 1E
> 90220 OULU
> FINLAND
> 
> ~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
> Simon says - in Latin please.
> ~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
> Thanks to Simon Glass for the translation =]