linux-kernel - Re: [RFC PATCH 3/3] cpufreq: Add Rust based cpufreq-dt driver

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Date: Mon, 22 Apr 2024 16:00:50 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Benno Lossin <benno.lossin@...ton.me>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
	Miguel Ojeda <miguel.ojeda.sandonis@...il.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>,
	Andreas Hindborg <a.hindborg@...sung.com>,
	Alice Ryhl <aliceryhl@...gle.com>, linux-pm@...r.kernel.org,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
	rust-for-linux@...r.kernel.org,
	Manos Pitsidianakis <manos.pitsidianakis@...aro.org>,
	Erik Schilling <erik.schilling@...aro.org>,
	Alex Bennée <alex.bennee@...aro.org>,
	Joakim Bech <joakim.bech@...aro.org>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 3/3] cpufreq: Add Rust based cpufreq-dt driver

On 07-04-24, 10:17, Benno Lossin wrote:
> On 07.04.24 11:54, Benno Lossin wrote:
> > On 05.04.24 13:09, Viresh Kumar wrote:
> >> +// Finds exact supply name from the OF node.
> >> +fn find_supply_name_exact(np: *mut bindings::device_node, name: &str) -> Option<CString> {
> >> +    let sname = CString::try_from_fmt(fmt!("{}-supply", name)).ok()?;
> >> +
> >> +    // SAFETY: The OF node is guaranteed by the C code to be valid.
> >> +    let pp = unsafe { bindings::of_find_property(np, sname.as_ptr() as *mut _, ptr::null_mut()) };
> > 
> > Drivers should avoid calling `unsafe` code as much as possible. They
> > also should not be calling `bindings` code directly. Please write (or
> > find) abstractions for these `unsafe` calls.
> 
> Having re-read the cover letter, I see that you are already aware of
> this. If you need any help with creating the abstractions, feel free to
> reach out!

Thanks Benno. I am not sure what's the right approach here as there
are so many missing things (frameworks) I need. Though I don't need
full support for them but just a handful of APIs.

And then there is dependency on the generic support for device/driver,
platform device/driver, etc.

-- 
viresh