linux-kernel - Re: [PATCH v8 08/24] dt-bindings: clock: Add RPMI clock service message proxy bindings

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CAK9=C2UDV3xCpKxZmT4NsRvN=hCcQrcx0fr-QFD2fuOrqmXmHA@mail.gmail.com>
Date: Fri, 25 Jul 2025 21:46:12 +0530
From: Anup Patel <apatel@...tanamicro.com>
To: Stephen Boyd <sboyd@...nel.org>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, Bartosz Golaszewski <brgl@...ev.pl>, 
	Conor Dooley <conor+dt@...nel.org>, Jassi Brar <jassisinghbrar@...il.com>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Linus Walleij <linus.walleij@...aro.org>, 
	Michael Turquette <mturquette@...libre.com>, Mika Westerberg <mika.westerberg@...ux.intel.com>, 
	"Rafael J . Wysocki" <rafael@...nel.org>, Rob Herring <robh@...nel.org>, 
	Thomas Gleixner <tglx@...utronix.de>, Uwe Kleine-König <ukleinek@...nel.org>, 
	Palmer Dabbelt <palmer@...belt.com>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Alexandre Ghiti <alex@...ti.fr>, Len Brown <lenb@...nel.org>, Sunil V L <sunilvl@...tanamicro.com>, 
	Rahul Pathak <rpathak@...tanamicro.com>, Leyfoon Tan <leyfoon.tan@...rfivetech.com>, 
	Atish Patra <atish.patra@...ux.dev>, Andrew Jones <ajones@...tanamicro.com>, 
	Samuel Holland <samuel.holland@...ive.com>, Anup Patel <anup@...infault.org>, 
	linux-clk@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-acpi@...r.kernel.org, linux-riscv@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [PATCH v8 08/24] dt-bindings: clock: Add RPMI clock service
 message proxy bindings

On Fri, Jul 25, 2025 at 8:12 AM Stephen Boyd <sboyd@...nel.org> wrote:
>
> Quoting Anup Patel (2025-07-04 00:03:40)
> > Add device tree bindings for the RPMI clock service group based
> > message proxy implemented by the SBI implementation (machine mode
> > firmware or hypervisor).
> >
> > The RPMI clock service group is defined by the RISC-V platform
> > management interface (RPMI) specification.
> >
> > Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> > Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> [...]
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    clock-controller {
>
> Maybe the name should be 'clock-service' then? I don't understand SBI so
> not sure why this is in DT to begin with. Is something consuming this
> node? Or a driver is binding to it?

SBI is a syscall style interface between SBI implementation (aka
M-mode firmware or hypervisor) and supervisor software (aka
Linux kernel).

We have DT based drivers in OpenSBI (M-mode firmware). This
binding allows Clock message proxy driver to be probed on the
OpenSBI side. The clock message proxy driver allows Linux
RPMI clock driver to send RPMI messages via OpenSBI as
proxy thereby sharing the RPMI transport between OpenSBI
and Linux kernel.

Regards,
Anup