linux-kernel - [RFC PATCH 0/3] Add Rust abstractions for nvmem-provider

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Message-ID: <20260128182925.13225-1-linkmauve@linkmauve.fr>
Date: Wed, 28 Jan 2026 19:29:19 +0100
From: Link Mauve <linkmauve@...kmauve.fr>
To: rust-for-linux@...r.kernel.org
Cc: Link Mauve <linkmauve@...kmauve.fr>,
	Srinivas Kandagatla <srini@...nel.org>,
	Miguel Ojeda <ojeda@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>,
	Daniel Almeida <daniel.almeida@...labora.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Lyude Paul <lyude@...hat.com>,
	Asahi Lina <lina+kernel@...hilina.net>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Tamir Duberstein <tamird@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 0/3] Add Rust abstractions for nvmem-provider

Hi, this is my first foray in Rust in the kernel!  I’m fairly used to
both Rust and the kernel, but not yet to both at the same time.

I wanted to try something simple before jumping to more advanced stuff
like DRM or V4L2 drivers, so I set on rewriting one of my old Wii
drivers in Rust.  So far I have only tested that the nvmem abstraction
and the driver compile, but haven’t tested it on an actual Wii, hence
the RFC.

I made sure there was no unsafe anywhere in the driver, and tried to
keep it to as few places as possible in the nvmem abstraction.  I still
have issues with the mutability of the NvmemProvider::Priv type, so for
now I’ve made it a simple reference but I believe this won’t work in the
long run (or even in the short run).  I’ll take any idea for how to fix
that.

So, comments welcome! :)

Link Mauve (3):
  nvmem: Document enum nvmem_type and its variants
  rust: nvmem: Add an abstraction for nvmem providers
  nvmem: Replace the Wii and Wii U OTP driver with a Rust one

 drivers/nvmem/Makefile          |   2 +-
 drivers/nvmem/nintendo-otp.c    | 122 -------------------------
 drivers/nvmem/nintendo_otp.rs   | 137 ++++++++++++++++++++++++++++
 include/linux/nvmem-provider.h  |   8 ++
 rust/bindings/bindings_helper.h |   1 +
 rust/kernel/lib.rs              |   2 +
 rust/kernel/nvmem.rs            | 155 ++++++++++++++++++++++++++++++++
 7 files changed, 304 insertions(+), 123 deletions(-)
 delete mode 100644 drivers/nvmem/nintendo-otp.c
 create mode 100644 drivers/nvmem/nintendo_otp.rs
 create mode 100644 rust/kernel/nvmem.rs

-- 
2.52.0