linux-kernel - RE: [PATCH v2 3/4] dt-bindings: watchdog: da9062: add watchdog timeout mode

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <DB9PR10MB4652C8A69A6A3F38B93ED18880679@DB9PR10MB4652.EURPRD10.PROD.OUTLOOK.COM>
Date:   Tue, 30 Nov 2021 16:11:06 +0000
From:   Adam Thomson <Adam.Thomson.Opensource@...semi.com>
To:     Guenter Roeck <linux@...ck-us.net>,
        Andrej Picej <andrej.picej@...ik.com>
CC:     Support Opensource <Support.Opensource@...semi.com>,
        "wim@...ux-watchdog.org" <wim@...ux-watchdog.org>,
        "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "linux-imx@....com" <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v2 3/4] dt-bindings: watchdog: da9062: add watchdog
 timeout mode

On Guenter Roeck wrote:

> > Document the watchdog timeout mode property. If this property is used
> > the user can select what happens on watchdog timeout. Set this property
> > to 1 to enable SHUTDOWN (the device resets), set it to 0 and the device
> > will go to POWERDOWN on watchdog timeout.
> >
> > Signed-off-by: Andrej Picej <andrej.picej@...ik.com>
> > ---
> >   Documentation/devicetree/bindings/watchdog/da9062-wdt.txt | 3 +++
> >   1 file changed, 3 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/watchdog/da9062-wdt.txt
> b/Documentation/devicetree/bindings/watchdog/da9062-wdt.txt
> > index 950e4fba8dbc..e3e6e56cee21 100644
> > --- a/Documentation/devicetree/bindings/watchdog/da9062-wdt.txt
> > +++ b/Documentation/devicetree/bindings/watchdog/da9062-wdt.txt
> > @@ -10,6 +10,9 @@ Optional properties:
> >   - dlg,use-sw-pm: Add this property to disable the watchdog during suspend.
> >   	Only use this option if you can't use the watchdog automatic suspend
> >   	function during a suspend (see register CONTROL_B).
> > +- dlg,wdt-sd: Set what happens on watchdog timeout. If this bit is set the
> > +	watchdog timeout triggers SHUTDOWN, if cleared the watchdog triggers
> > +	POWERDOWN. Can be 0 or 1.
> >
> 
> Why does it need a value ? Why not just bool ?

One argument might be that if the property isn't provided then the OTP
configured value can persist without needing a FW change around this DT binding.

My belief though is that the majority of users would have this property set to 0
by default in OTP, so a boolean would be OK I think here to enable watchdog
shutdown.