linux-kernel - Re: [PATCH v3 2/4] dt-bindings: gpio: add support for NXP S32G2/S32G3 SoCs

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Message-ID: <20240922-plug-legible-74f56d898123@spud>
Date: Sun, 22 Sep 2024 22:07:20 +0100
From: Conor Dooley <conor@...nel.org>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Andrei Stefanescu <andrei.stefanescu@....nxp.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Chester Lin <chester62515@...il.com>,
	Matthias Brugger <mbrugger@...e.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>, linux-gpio@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	NXP S32 Linux Team <s32@....com>
Subject: Re: [PATCH v3 2/4] dt-bindings: gpio: add support for NXP
 S32G2/S32G3 SoCs

On Sun, Sep 22, 2024 at 11:04:22PM +0200, Krzysztof Kozlowski wrote:
> On Sat, Sep 21, 2024 at 10:58:46PM +0100, Conor Dooley wrote:
> > On Fri, Sep 20, 2024 at 03:40:31PM +0200, Krzysztof Kozlowski wrote:
> > > On 20/09/2024 15:33, Andrei Stefanescu wrote:

> > > >>> +properties:
> > > >>> +  compatible:
> > > >>> +    items:
> > > >>> +      - const: nxp,s32g2-siul2-gpio
> > > >>
> > > >> Commit message and binding description say s32g2 and s32g3, but there's
> > > >> only a compatible here for g2.
> > > > 
> > > > Yes, the SIUL2 GPIO hardware is the same for both S32G2 and S32G3 SoCs. I plan
> > > > to reuse the same compatible when I add the SIUL2 GPIO device tree node for
> > > > the S32G3 boards. Would that be ok?
> > > 
> > > There are only few exceptions where re-using compatible is allowed. Was
> > > S32G on them? Please consult existing practice/maintainers and past reviews.
> 
> Just in case this was not clear - comment "please consult existing..."
> was towards Andrei, not you Conor.

Oh I know, I was just passing through and figured I may as well leave a
comment repeating what I said on the other devices :)

> > Pretty sure I had a similar conversation about another peripheral on
> > these devices, and it was established that these are not different fusings
> > etc, but rather are independent SoCs that reuse an IP core. Given that,
> > I'd expect to see a fallback compatible used here, as is the norm.
> 
> Yep.
> 
> Best regards,
> Krzysztof
> 

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