linux-kernel - Re: [PATCH v3 3/3] rust: Add SoC Driver Sample

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Message-Id: <DF04Y5PE9GLT.3MGJ2WAOP1WY8@nvidia.com>
Date: Wed, 17 Dec 2025 11:28:07 +0900
From: "Alexandre Courbot" <acourbot@...dia.com>
To: "Matthew Maurer" <mmaurer@...gle.com>, "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>,
 "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>, "Rafael J. Wysocki"
 <rafael@...nel.org>
Cc: <linux-kernel@...r.kernel.org>, <rust-for-linux@...r.kernel.org>
Subject: Re: [PATCH v3 3/3] rust: Add SoC Driver Sample

On Wed Dec 17, 2025 at 4:24 AM JST, Matthew Maurer wrote:
> Shows registration of a SoC device upon receipt of a probe.
>
> Signed-off-by: Matthew Maurer <mmaurer@...gle.com>
> ---
>  MAINTAINERS              |  1 +
>  samples/rust/Kconfig     | 11 +++++++
>  samples/rust/Makefile    |  1 +
>  samples/rust/rust_soc.rs | 82 ++++++++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 95 insertions(+)
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 4ff01fb0f1bda27002094113c0bf9d074d28fdb6..bb2e710277cc84dd6042d4d46076e665d9f68752 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -7705,6 +7705,7 @@ F:	samples/rust/rust_debugfs.rs
>  F:	samples/rust/rust_debugfs_scoped.rs
>  F:	samples/rust/rust_driver_platform.rs
>  F:	samples/rust/rust_driver_faux.rs
> +F:	samples/rust/rust_soc.rs
>  
>  DRIVERS FOR OMAP ADAPTIVE VOLTAGE SCALING (AVS)
>  M:	Nishanth Menon <nm@...com>
> diff --git a/samples/rust/Kconfig b/samples/rust/Kconfig
> index 3efa51bfc8efccd91d9ee079ccd078ed1a6e8aa7..c49ab910634596aea4a1a73dac87585e084f420a 100644
> --- a/samples/rust/Kconfig
> +++ b/samples/rust/Kconfig
> @@ -161,6 +161,17 @@ config SAMPLE_RUST_DRIVER_AUXILIARY
>  
>  	  If unsure, say N.
>  
> +config SAMPLE_RUST_SOC
> +	tristate "SoC Driver"
> +	select SOC_BUS
> +	help
> +	  This option builds the Rust SoC driver sample.
> +
> +	  To compile this as a module, choose M here:
> +	  the module will be called rust_soc.
> +
> +	  If unsure, say N.
> +
>  config SAMPLE_RUST_HOSTPROGS
>  	bool "Host programs"
>  	help
> diff --git a/samples/rust/Makefile b/samples/rust/Makefile
> index f65885d1d62bf406b0db13121ef3e5b09829cfbc..6c0aaa58ccccfd12ef019f68ca784f6d977bc668 100644
> --- a/samples/rust/Makefile
> +++ b/samples/rust/Makefile
> @@ -15,6 +15,7 @@ obj-$(CONFIG_SAMPLE_RUST_DRIVER_USB)		+= rust_driver_usb.o
>  obj-$(CONFIG_SAMPLE_RUST_DRIVER_FAUX)		+= rust_driver_faux.o
>  obj-$(CONFIG_SAMPLE_RUST_DRIVER_AUXILIARY)	+= rust_driver_auxiliary.o
>  obj-$(CONFIG_SAMPLE_RUST_CONFIGFS)		+= rust_configfs.o
> +obj-$(CONFIG_SAMPLE_RUST_SOC)			+= rust_soc.o
>  
>  rust_print-y := rust_print_main.o rust_print_events.o
>  
> diff --git a/samples/rust/rust_soc.rs b/samples/rust/rust_soc.rs
> new file mode 100644
> index 0000000000000000000000000000000000000000..33043b0ac8dadec36aebf369f0fb68dbb3b118ed
> --- /dev/null
> +++ b/samples/rust/rust_soc.rs
> @@ -0,0 +1,82 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +//! Rust SoC Platform driver sample.
> +
> +use kernel::{
> +    acpi,
> +    c_str,
> +    device::Core,
> +    of,
> +    platform,
> +    prelude::*,
> +    soc,
> +    str::CString,
> +    sync::aref::ARef, //
> +};
> +use pin_init::pin_init_scope;
> +
> +#[pin_data]
> +struct SampleSocDriver {
> +    pdev: ARef<platform::Device>,
> +    #[pin]
> +    _dev_reg: soc::Registration,
> +}
> +
> +kernel::of_device_table!(
> +    OF_TABLE,
> +    MODULE_OF_TABLE,
> +    <SampleSocDriver as platform::Driver>::IdInfo,
> +    [(of::DeviceId::new(c_str!("test,rust-device")), ())]

C strings can now be declared using `c"test,rust-device"` (applies
through this file).