linux-kernel - Re: [PATCH 09/43] dt-bindings: watchdog: add DT bindings for Cirrus EP93x

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Date:   Fri, 28 Apr 2023 14:20:58 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Nikita Shubin <nikita.shubin@...uefel.me>
Cc:     Arnd Bergmann <arnd@...nel.org>, Linus Walleij <linusw@...nel.org>,
        Alexander Sverdlin <alexander.sverdlin@...il.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/43] dt-bindings: watchdog: add DT bindings for Cirrus
 EP93x

On 28/04/2023 16:33, Nikita Shubin wrote:
> Hello Krzysztof!
> 
> On Tue, 2023-04-25 at 11:31 +0200, Krzysztof Kozlowski wrote:
>> On 24/04/2023 14:34, Nikita Shubin wrote:
>>> This adds device tree bindings for the Cirrus Logic EP93xx
>>> watchdog block used in these SoCs.
>>>
>>> Signed-off-by: Nikita Shubin <nikita.shubin@...uefel.me>
>>> ---
>>>  .../bindings/watchdog/cirrus,ep93xx-wdt.yaml  | 38
>>> +++++++++++++++++++
>>>  1 file changed, 38 insertions(+)
>>>  create mode 100644
>>> Documentation/devicetree/bindings/watchdog/cirrus,ep93xx-wdt.yaml
>>>
>>> diff --git
>>> a/Documentation/devicetree/bindings/watchdog/cirrus,ep93xx-wdt.yaml
>>> b/Documentation/devicetree/bindings/watchdog/cirrus,ep93xx-wdt.yaml
>>> new file mode 100644
>>> index 000000000000..f39d6b14062d
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/watchdog/cirrus,ep93xx-
>>> wdt.yaml
>>> @@ -0,0 +1,38 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id:
>>> http://devicetree.org/schemas/watchdog/cirrus,ep93xx-wdt.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Cirrus Logic EP93xx Watchdog Timer
>>
>> EP93xx is no EP9301. This does not match your compatible list. You
>> should probably list all of your devices. With or without
>> compatibility
>> between them (so with a generic fallback for example).
> 
> I will rename file to cirrus,ep9301-wdt.yaml, all ep93xx SoC family has
> the same watchdog, so there is now reason for other compatible i think.

You should always have dedicated compatibles, even if using one fallback.
https://elixir.bootlin.com/linux/v6.1-rc1/source/Documentation/devicetree/bindings/writing-bindings.rst#L42

Best regards,
Krzysztof