linux-kernel - Re: [RFC PATCH 6/6] rust: cpufreq: Add rust implementation of cppc

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Message-ID: <1605d622-faf5-4535-bd71-ba514ee102dd@arm.com>
Date: Fri, 16 Aug 2024 08:59:22 +0200
From: Pierre Gondois <pierre.gondois@....com>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org, "Rafael J. Wysocki" <rafael@...nel.org>,
 Len Brown <lenb@...nel.org>, Viresh Kumar <viresh.kumar@...aro.org>,
 Robert Moore <robert.moore@...el.com>, Miguel Ojeda <ojeda@...nel.org>,
 Alex Gaynor <alex.gaynor@...il.com>,
 Wedson Almeida Filho <wedsonaf@...il.com>, Boqun Feng
 <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
 Björn Roy Baron <bjorn3_gh@...tonmail.com>,
 Benno Lossin <benno.lossin@...ton.me>,
 Andreas Hindborg <a.hindborg@...sung.com>, Alice Ryhl
 <aliceryhl@...gle.com>, Martin Rodriguez Reboredo <yakoyoku@...il.com>,
 Manos Pitsidianakis <manos.pitsidianakis@...aro.org>,
 Mika Westerberg <mika.westerberg@...ux.intel.com>,
 FUJITA Tomonori <fujita.tomonori@...il.com>,
 Thomas Bertschinger <tahbertschinger@...il.com>,
 Danilo Krummrich <dakr@...hat.com>, linux-acpi@...r.kernel.org,
 linux-pm@...r.kernel.org, acpica-devel@...ts.linux.dev,
 rust-for-linux@...r.kernel.org, Metin Kaya <metin.kaya@....com>
Subject: Re: [RFC PATCH 6/6] rust: cpufreq: Add rust implementation of
 cppc_cpufreq driver

Hello Greg, Miguel,

On 8/15/24 15:04, Miguel Ojeda wrote:
> On Thu, Aug 15, 2024 at 10:31 AM Pierre Gondois <pierre.gondois@....com> wrote:
>>
>> In an effort to add test/support the cpufreq framework in rust,
>> add a rust implementation of the cppc_cpufreq driver named:
>> `rcppc_cpufreq`.
> 
> Similar to what Greg said -- is this intended to be something like a
> "Rust reference driver" [1] for the subsystem?

The initial intent was to review/test Viresh's patchset [1]. I then
thought it would be a good idea to implement another cpufreq driver
to see if the provided interface would work.
As the cpufreq-dt driver is re-implemented in Viresh's patchset,
I thought it was also ok to have this driver.

> 
> [1] https://rust-for-linux.com/rust-reference-drivers
> 
>> +       depends on ACPI_PROCESSOR
>> +       depends on ARM || ARM64 || RISCV
> 

Yes right

> `depends on RUST`?
> 
> Also, I imagine you skipped all safety comments etc. since it is an
> RFC, but I thought I would mention it nevertheless.

Ok, if it is decided not to drop this patchset, I ll add some comments,

> 
> Thanks for experimenting with Rust!
> 
> Cheers,
> Miguel

Regards,
Pierre