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Fri, 15 Aug 2025 22:58:26 -0700 (PDT) From: Ayush Singh Date: Sat, 16 Aug 2025 11:27:46 +0530 Subject: [PATCH v2 2/2] rust: kernel: of: Add overlay id abstraction Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250816-rust-overlay-abs-v2-2-48a2c8921df2@beagleboard.org> References: <20250816-rust-overlay-abs-v2-0-48a2c8921df2@beagleboard.org> In-Reply-To: <20250816-rust-overlay-abs-v2-0-48a2c8921df2@beagleboard.org> To: Jason Kridner , Deepak Khatri , Robert Nelson , Miguel Ojeda , Dhruva Gole , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Greg Kroah-Hartman , "Rafael J. Wysocki" , Rob Herring , Saravana Kannan , Benno Lossin , Benno Lossin Cc: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Ayush Singh X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1536; i=ayush@beagleboard.org; h=from:subject:message-id; bh=DrbctBGMgceWHyU2G3iajKdl9FJ/GIp+Lv0AO0b4Ibw=; b=owEBbQKS/ZANAwAKAQXO9ceJ5Vp0AcsmYgBooB3tJrlOtPTqSiWnSQcILitlwR6+YrzBwopAB skmiYeHt6aJAjMEAAEKAB0WIQTfzBMe8k8tZW+lBNYFzvXHieVadAUCaKAd7QAKCRAFzvXHieVa dAQVD/0Q5hTcGTe/dOvA31APqGKCstjWbPgoIGuSHivTDdQ6WDmL8YTE0ye8sXqDS4b5+MMRZks Cp8ZRw+Nb6TxCCnnuBoBYtXcay5Mkl3jXX/DRS+TEkVP+y2iJz35C7rQrJv5f/i4acPBSnQmhN1 rNAEL2JF+v1RkWfoJuScYR4geli6Ojcreb+03NAterVUVCeXauaMQjK6lY4YP1+cwyd45CXWKNT NPZK1PLZuwZxsif0TA+OmvbyXp2ByTFp35V1dGt9Cw/LeHvDzKgtZgw/Y6FEJWhS6i+nkEbLrDH CCveRN4nYFbofeXyDly4UPF+7fnmpUFAxUpZbbf9jg3RyK3J5BONwfLmeVlEFOr4J/GcSZxgi7W KhXiG2rombic+QRufQvRF5Yw7K9Xh0Gha20Nw6aCGuElxO5MKTQXYJbu4fGH7kEiEog8uwyDtH4 Am6UsqTJ0BSz8nVMF2/o96uND58qfRvumguVGVhEB1y25+UjduKSNQMpnrF3CPN96CAqqXr4k4m MVuknIj3vd3/LolSZ98XP6L5iJFvYoT0oVVIosu7I8KWK64+AacUrmNzPzl6vbH5ZNQHJP/zS3N BCxSNKWrPuxYBWZedGrZVdsxkWKezUj2L+IiTJ7mSt+Q7BcVO/PKOC66Vqdcm1MJS16v2ULQu3F EBxGO4SdJcrjYTg== X-Developer-Key: i=ayush@beagleboard.org; a=openpgp; fpr=DFCC131EF24F2D656FA504D605CEF5C789E55A74 Allow applying devicetree overlays from Rust. The overlay is removed on Drop. Signed-off-by: Ayush Singh --- rust/kernel/of.rs | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/rust/kernel/of.rs b/rust/kernel/of.rs index 74d42dce06f0e9f67a0e5bd1287117b4966d4af9..646148cc959fd5414271f9cf9023ef5d77a2ac2c 100644 --- a/rust/kernel/of.rs +++ b/rust/kernel/of.rs @@ -75,3 +75,37 @@ pub fn as_raw(&self) -> *mut bindings::device_node { self.0.get() } } + +/// Devicetree overlay present in livetree. +/// +/// The overlay is removed on Drop +pub struct OvcsId(kernel::ffi::c_int); + +impl OvcsId { + /// Create and apply an overlay changeset to the live tree. + pub fn of_overlay_fdt_apply(overlay: &[u8], base: &DeviceNode) -> Result { + let mut ovcs_id: kernel::ffi::c_int = 0; + + // Ensure that overlay length fits in u32 + let Ok(overlay_len) = overlay.len().try_into() else { + return Err(crate::error::code::E2BIG); + }; + + crate::error::to_result(unsafe { + bindings::of_overlay_fdt_apply( + overlay.as_ptr().cast(), + overlay_len, + &mut ovcs_id, + base.as_raw(), + ) + })?; + + Ok(Self(ovcs_id)) + } +} + +impl Drop for OvcsId { + fn drop(&mut self) { + unsafe { bindings::of_overlay_remove(&mut self.0) }; + } +} -- 2.50.1