linux-kernel - Re: [RFC PATCH 2/4] dt-bindings: firmware: thead,th1520-aon: add a mailbox name for SBI

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Message-ID: <026419bc-c0f8-4891-a348-311f51cb999f@kernel.org>
Date: Thu, 14 Aug 2025 09:49:50 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Icenowy Zheng <uwu@...nowy.me>, Drew Fustini <fustini@...nel.org>,
 Guo Ren <guoren@...nel.org>, Fu Wei <wefu@...hat.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Jassi Brar <jassisinghbrar@...il.com>,
 Michal Wilczynski <m.wilczynski@...sung.com>
Cc: Han Gao <rabenda.cn@...il.com>, Inochi Amaoto <inochiama@...il.com>,
 Yao Zi <ziyao@...root.org>, linux-riscv@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/4] dt-bindings: firmware: thead,th1520-aon: add a
 mailbox name for SBI

On 14/08/2025 09:30, Icenowy Zheng wrote:
> 在 2025-08-14星期四的 09:18 +0200，Krzysztof Kozlowski写道：
>> On 14/08/2025 09:07, Icenowy Zheng wrote:
>>> The SBI firmware might want to communicate to the AON firmware too.
>>>
>>> Add a mbox-name item to allow to allocate a mailbox for SBI.
>>>
>>> Signed-off-by: Icenowy Zheng <uwu@...nowy.me>
>>> ---
>>>  .../devicetree/bindings/firmware/thead,th1520-aon.yaml     | 7
>>> ++++---
>>>  1 file changed, 4 insertions(+), 3 deletions(-)
>>>
>>> diff --git
>>> a/Documentation/devicetree/bindings/firmware/thead,th1520-aon.yaml
>>> b/Documentation/devicetree/bindings/firmware/thead,th1520-aon.yaml
>>> index 3365124c7fd47..555465f4aab4e 100644
>>> --- a/Documentation/devicetree/bindings/firmware/thead,th1520-
>>> aon.yaml
>>> +++ b/Documentation/devicetree/bindings/firmware/thead,th1520-
>>> aon.yaml
>>> @@ -26,11 +26,12 @@ properties:
>>>      const: thead,th1520-aon
>>>  
>>>    mboxes:
>>> -    maxItems: 1
>>> +    maxItems: 2
>>
>>
>> ABI break without explanation why ("allow" is not a reason to affect
>> ABI) and its impact.
> 
> Is adding items an ABI break?

Adding required items is ABI break. You can easily test it. Apply patch
#1 and test your DTS. Apply patch #2 and test your DTS. New warnings
appear, so that's a proof of ABI impact.


> 
> Or should I explicitly say "minItems: 1" here?

Yes, but you should clearly explain the impact. Is it working? Not
working? Are you fixing something?

Best regards,
Krzysztof