linux-kernel - Re: [PATCH v5 2/4] dt-bindings: watchdog: add new binding for meson secure watchdog

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Message-ID: <f7b0afe7-e317-2422-de7e-878837f9f238@amlogic.com>
Date:   Mon, 16 Dec 2019 14:03:07 +0800
From:   Xingyu Chen <xingyu.chen@...ogic.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Rob Herring <robh+dt@...nel.org>
CC:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Kevin Hilman <khilman@...libre.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Qianggui Song <qianggui.song@...ogic.com>,
        <devicetree@...r.kernel.org>, <linux-watchdog@...r.kernel.org>,
        Jianxin Pan <jianxin.pan@...ogic.com>,
        <linux-kernel@...r.kernel.org>, Jian Hu <jian.hu@...ogic.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>,
        Jerome Brunet <jbrunet@...libre.com>
Subject: Re: [PATCH v5 2/4] dt-bindings: watchdog: add new binding for meson
 secure watchdog

Hi, Martin

Sorry for the late reply.

On 2019/12/13 4:05, Martin Blumenstingl wrote:
> Hi Xingyu and Rob,
>
> On Thu, Dec 12, 2019 at 1:20 PM Xingyu Chen <xingyu.chen@...ogic.com> wrote:
> [...]
>> +examples:
>> +  - |
>> +    watchdog {
>> +          compatible = "amlogic,meson-sec-wdt";
>> +          timeout-sec = <60>;
>> +    };
> in v3 of this patch Rob commented that there shouldn't be an OF node
> if there are no additional properties
> with timeout-sec there's now an additional property so my
> understanding is that it's fine to have an OF node
Your understanding is correct.
>
> what I don't understand yet is where this node should be placed.
> is it supposed to be a child node of the secure monitor node (for
> which we already have a binding here:
> Documentation/devicetree/bindings/firmware/meson/meson_sm.txt) or
> where else would we place it inside the .dts?
IMO,  Although the watchdog node need to reference the meson_sm node, 
there is no
bus-like dependencies between the devices which the two nodes 
corresponding to.
so i think that the watchdog node as child node of meson_sm maybe not 
appropriate.
>
>
> Martin
>
>
> [0] https://patchwork.kernel.org/patch/11211399/
>
> .
>