linux-kernel - Re: [PATCH v4 01/26] dt-bindings: interrupt-controller: Add Arm GICv5

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Message-ID: <CAL_JsqL7x53an2-MaLHP5tfVXb4JxT8ORUMaA8pL-gMsWLJqkA@mail.gmail.com>
Date: Tue, 3 Jun 2025 14:11:34 -0500
From: Rob Herring <robh@...nel.org>
To: Peter Maydell <peter.maydell@...aro.org>
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Marc Zyngier <maz@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Conor Dooley <conor+dt@...nel.org>, 
	Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, andre.przywara@....com, 
	Arnd Bergmann <arnd@...db.de>, Sascha Bischoff <sascha.bischoff@....com>, 
	Timothy Hayes <timothy.hayes@....com>, "Liam R. Howlett" <Liam.Howlett@...cle.com>, 
	Mark Rutland <mark.rutland@....com>, Jiri Slaby <jirislaby@...nel.org>, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	devicetree@...r.kernel.org, suzuki.poulose@....com
Subject: Re: [PATCH v4 01/26] dt-bindings: interrupt-controller: Add Arm GICv5

On Tue, Jun 3, 2025 at 10:37 AM Peter Maydell <peter.maydell@...aro.org> wrote:
>
> On Tue, 3 Jun 2025 at 16:15, Rob Herring <robh@...nel.org> wrote:
> >
> > On Tue, Jun 3, 2025 at 2:48 AM Lorenzo Pieralisi <lpieralisi@...nel.org> wrote:
> > >
> > > On Thu, May 29, 2025 at 02:17:26PM +0100, Peter Maydell wrote:
> > > > secure.txt says:
> > > > # The general principle of the naming scheme for Secure world bindings
> > > > # is that any property that needs a different value in the Secure world
> > > > # can be supported by prefixing the property name with "secure-". So for
> > > > # instance "secure-foo" would override "foo".
> >
> > Today I would say a 'secure-' prefix is a mistake. To my knowledge,
> > it's never been used anyways. But I don't have much visibility into
> > what secure world firmware is doing.
>
> QEMU uses it for communicating with the secure firmware if
> you run secure firmware on the virt board. It's done that
> since we introduced that binding. Indeed that use case is *why*
> the binding is there. It works fine for the intended purpose,
> which is "most devices are visible in both S and NS, but a few
> things are S only (UART, a bit of RAM, secure-only flash").

I meant "secure-" as a prefix allowed on *any* property, not
"secure-status" specifically, which is the only thing QEMU uses
AFAICT. IOW, I don't think we should be creating secure-reg,
secure-interrupts, secure-clocks, etc.

Rob