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: <1b63d1872f5b2c89f2fafdf717bda5ec29589b69.camel@icenowy.me>
Date: Thu, 14 Aug 2025 15:30:10 +0800
From: Icenowy Zheng <uwu@...nowy.me>
To: Krzysztof Kozlowski <krzk@...nel.org>, 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

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?

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

> 
> 
> Best regards,
> Krzysztof