linux-kernel - Re: [PATCH 1/4] dt-bindings: mfd: Add sony,cronos-cpld

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Message-ID: <c99820d9-4753-403e-adf7-b2b9fb496925@linaro.org>
Date: Mon, 20 Oct 2025 18:11:07 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Timothy Pearson <tpearson@...torengineering.com>
Cc: robh <robh@...nel.org>, devicetree <devicetree@...r.kernel.org>,
 linux-kernel <linux-kernel@...r.kernel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Lee Jones <lee@...nel.org>, Georgy Yakovlev <Georgy.Yakovlev@...y.com>
Subject: Re: [PATCH 1/4] dt-bindings: mfd: Add sony,cronos-cpld

On 20/10/2025 18:01, Timothy Pearson wrote:
> 
> 
> ----- Original Message -----
>> From: "Krzysztof Kozlowski" <krzysztof.kozlowski@...aro.org>
>> To: "Timothy Pearson" <tpearson@...torengineering.com>, "robh" <robh@...nel.org>
>> Cc: "devicetree" <devicetree@...r.kernel.org>, "linux-kernel" <linux-kernel@...r.kernel.org>, "Conor Dooley"
>> <conor+dt@...nel.org>, "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>, "Lee Jones" <lee@...nel.org>, "Georgy
>> Yakovlev" <Georgy.Yakovlev@...y.com>, "Shawn Anastasio" <sanastasio@...torengineering.com>
>> Sent: Monday, October 20, 2025 10:58:40 AM
>> Subject: Re: [PATCH 1/4] dt-bindings: mfd: Add sony,cronos-cpld
> 
>> On 20/10/2025 17:34, Timothy Pearson wrote:
>>>>> +  watchdog:
>>>>> +    type: object
>>>>> +    description: Cronos Platform Watchdog Timer
>>>>> +
>>>>> +    allOf:
>>>>> +      - $ref: watchdog.yaml#
>>>>> +
>>>>> +    properties:
>>>>> +      compatible:
>>>>> +        const: sony,cronos-watchdog
>>>>
>>>> There's no need for a child node here. 'timeout-sec' can just go in the
>>>> parent node.
>>>
>>> Could you elaborate on this please?  As far as I can tell we ref watchdog.yaml
>>> and need some kind of compatible string, so why would I break out timeout-sec
>>> directly here?
>>
>>
>> Please look where the comment was placed. Under $ref? No. Under this
>> compatible. $ref goes to the parent, obviously.
> 
> This is not an area of the kernel I'm normally changing, so I appreciate the insight.  None of this yaml syntax is particularly obvious the first time it's encountered, at least not to me.

Sure, apologies for sounding harsh.

> 
>> You do not need kind of compatible string. Parent already has one. You
>> do not need compatible strings at all to instantiate Linux drivers.
>> That's pretty common pattern for most of MFD-like devices, plenty of
>> examples in the kernel.
> 

Maybe this will be useful - bd96801_wdt.c is example driver which
follows correct design and takes timeout from the parent (wd->dev is
parent of watchdog platform device), although parent's bindings lack
$ref to watchdog. I'll fix that.


> Understood.


Best regards,
Krzysztof