linux-kernel - Re: [PATCH v4 1/1] dt-bindings: watchdog: starfive,jh7100-wdt: Add compatible for JH8100

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Date: Mon, 18 Dec 2023 22:27:11 +0800
From: Ji Sheng Teoh <jisheng.teoh@...rfivetech.com>
To: <krzysztof.kozlowski@...aro.org>
CC: <conor+dt@...nel.org>, <devicetree@...r.kernel.org>,
	<jisheng.teoh@...rfivetech.com>, <krzysztof.kozlowski+dt@...aro.org>,
	<leyfoon.tan@...rfivetech.com>, <linux-kernel@...r.kernel.org>,
	<linux-watchdog@...r.kernel.org>, <linux@...ck-us.net>, <robh+dt@...nel.org>,
	<samin.guo@...rfivetech.com>, <wim@...ux-watchdog.org>,
	<xingyu.wu@...rfivetech.com>
Subject: Re: [PATCH v4 1/1] dt-bindings: watchdog: starfive,jh7100-wdt: Add compatible for JH8100

On Mon, 18 Dec 2023 09:41:07 +0100
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

> On 16/12/2023 02:48, Ji Sheng Teoh wrote:
> > Add "starfive,jh8100-wdt" compatible string for StarFive's JH8100
> > watchdog.
> > Since JH8100 watchdog only has 1 reset signal, update binding
> > document to support one reset for "starfive,jh8100-wdt" compatible.
> > 
> > Signed-off-by: Ley Foon Tan <leyfoon.tan@...rfivetech.com>
> > Signed-off-by: Ji Sheng Teoh <jisheng.teoh@...rfivetech.com>
> > ---
> >  .../watchdog/starfive,jh7100-wdt.yaml         | 29
> > +++++++++++++++---- 1 file changed, 23 insertions(+), 6 deletions(-)
> > 
> > diff --git
> > a/Documentation/devicetree/bindings/watchdog/starfive,jh7100-wdt.yaml
> > b/Documentation/devicetree/bindings/watchdog/starfive,jh7100-wdt.yaml
> > index 68f3f6fd08a6..ab077f64a83e 100644 ---
> > a/Documentation/devicetree/bindings/watchdog/starfive,jh7100-wdt.yaml
> > +++
> > b/Documentation/devicetree/bindings/watchdog/starfive,jh7100-wdt.yaml
> > @@ -19,14 +19,12 @@ description: isn't cleared, the watchdog will
> > reset the system unless the watchdog reset is disabled. -allOf:
> > -  - $ref: watchdog.yaml#
> > -
> >  properties:
> >    compatible:
> >      enum:
> >        - starfive,jh7100-wdt
> >        - starfive,jh7110-wdt
> > +      - starfive,jh8100-wdt  
> 
> What is happening with this patchset? I asked about one specific
> items. you know - comment is written under specific inline quopte.
> You wrote in changelog "Drop items in compatible field.", but I see
> oneOf gone!

My bad, I've interpreted it wrongly. 
Will rework the compatible field to this instead:

  compatible:
    oneOf:
      - enum:
          - starfive,jh7100-wdt
          - starfive,jh7110-wdt
      - items:
          - enum:
              - starfive,jh8100-wdt
          - const: starfive,jh7110-wdt


While reworking this, I've noticed reset field with maxItems alone will
cause dt_binding_check to fail with following error:
'watchdog@...70000: resets: [[4294967295, 15]] is too short'
This is fixed by defining minItems and maxItems as follow:

  resets:
    minItems: 1
    maxItems: 2

> 
> I have real doubts that you ever tested your entire solution with this
> binding. Where is the DTS?
> 

Currently, the DTS is still in internal and yet to upstream as it depends
on [1].
[1]
https://lore.kernel.org/all/20231201121410.95298-1-jeeheng.sia@starfivetech.com/

> Best regards,
> Krzysztof
>