linux-kernel - [PATCH 1/3] rust: device: implement FwNode::is

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Message-ID: <20250616194439.68775-1-dakr@kernel.org>
Date: Mon, 16 Jun 2025 21:40:19 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: igor.korotin.linux@...il.com,
	gregkh@...uxfoundation.org,
	rafael@...nel.org,
	ojeda@...nel.org,
	alex.gaynor@...il.com,
	boqun.feng@...il.com,
	gary@...yguo.net,
	bjorn3_gh@...tonmail.com,
	benno.lossin@...ton.me,
	a.hindborg@...nel.org,
	aliceryhl@...gle.com,
	tmgross@...ch.edu
Cc: rust-for-linux@...r.kernel.org,
	linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Danilo Krummrich <dakr@...nel.org>
Subject: [PATCH 1/3] rust: device: implement FwNode::is_compatible()

Implement FwNode::is_compatible() to check whether a given match string
is compatible with a FwNode.

Signed-off-by: Danilo Krummrich <dakr@...nel.org>
---
 rust/helpers/property.c        | 6 ++++++
 rust/kernel/device/property.rs | 9 +++++++++
 2 files changed, 15 insertions(+)

diff --git a/rust/helpers/property.c b/rust/helpers/property.c
index 08f68e2dac4a..177b9ffd7ba4 100644
--- a/rust/helpers/property.c
+++ b/rust/helpers/property.c
@@ -6,3 +6,9 @@ void rust_helper_fwnode_handle_put(struct fwnode_handle *fwnode)
 {
 	fwnode_handle_put(fwnode);
 }
+
+bool rust_helper_fwnode_device_is_compatible(const struct fwnode_handle *fwnode,
+					     const char *match)
+{
+	return fwnode_device_is_compatible(fwnode, match);
+}
diff --git a/rust/kernel/device/property.rs b/rust/kernel/device/property.rs
index 838509111e57..a946bf8d5571 100644
--- a/rust/kernel/device/property.rs
+++ b/rust/kernel/device/property.rs
@@ -93,6 +93,15 @@ pub fn property_present(&self, name: &CStr) -> bool {
         unsafe { bindings::fwnode_property_present(self.as_raw().cast_const(), name.as_char_ptr()) }
     }
 
+    /// Return `true` if this [`FwNode`] is compatible with `match_str`, `false` otherwise.
+    pub fn is_compatible(&self, match_str: &CStr) -> bool {
+        // SAFETY:
+        // - By the invariant of `CStr`, `name.as_char_ptr()` is valid and null-terminated.
+        // - The type invariant of `Self` guarantees that `self.as_raw() is a pointer to a valid
+        //   `struct fwnode_handle`.
+        unsafe { bindings::fwnode_device_is_compatible(self.as_raw(), match_str.as_char_ptr()) }
+    }
+
     /// Returns firmware property `name` boolean value.
     pub fn property_read_bool(&self, name: &CStr) -> bool {
         // SAFETY:

base-commit: 2a1ea59de83bf367215e2a4dd9bf8bbd061349b3
-- 
2.49.0