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

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Date:   Mon, 16 Dec 2019 05:30:08 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Xingyu Chen <xingyu.chen@...ogic.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        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

On 12/15/19 10:03 PM, Xingyu Chen wrote:
> 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.

The watchdog driver needs the meson SM's dt node, and it depends on the existence
of that node. That seems enough of a relationship to warrant having it as child note.

Guenter