From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mout02.posteo.de (mout02.posteo.de [185.67.36.66]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4AFD036F407 for ; Fri, 6 Mar 2026 19:35:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.67.36.66 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772825732; cv=none; b=AY02D0/ghGP7Sb1PlDw7TLOmJgnTuNWa8TGAidBO9zi2+m/fB0Uj45XcLPyIrINrlGfspFDxl4TnCGPZS1jOv7BYrCZNvHkEf7x05WaSHM8WuJQlRhh2a44F2VqxGKauiPHVu/rJxEKlLpcLduFu3ZV7iC0qaQEwLThjv9mVVpA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772825732; c=relaxed/simple; bh=xpWbvmX/68bsH1i658qcmKhe/9CQa5oJlgpDVyhNyN4=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=jfPPR7j7JNriAQhHXgPunYnvQisJ9QV7AhcoTYFjovMEIRBeek4ZVKxkMTj5n8x8IHexd0QJQ0h8cKvaBODWckd3Q7sOhMWLqQOMb69y9tD56J+SnUsPMZ219RipqoKMElMHcvPd4sfWfauAOQCtYoG35Q+tQ2lLcEHbW3ePjVc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=posteo.de; spf=pass smtp.mailfrom=posteo.de; dkim=pass (2048-bit key) header.d=posteo.de header.i=@posteo.de header.b=G8bJxBMj; arc=none smtp.client-ip=185.67.36.66 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=posteo.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=posteo.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=posteo.de header.i=@posteo.de header.b="G8bJxBMj" Received: from submission (posteo.de [185.67.36.169]) by mout02.posteo.de (Postfix) with ESMTPS id 55068240104 for ; Fri, 6 Mar 2026 20:35:27 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=posteo.de; s=2017; t=1772825727; bh=+x9zlggoJflBpUoGpzg4FrVsX2wDF7j7U01e+Exq+UQ=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type: Content-Transfer-Encoding:To:Cc:Autocrypt:OpenPGP:From; b=G8bJxBMjdkMWtNKJKVTMIWgNupQinhjorFXb6l57k6tyDhv64AhPAN4TCMcVJd3kK niFrkjhPZgSlehgm7U+I5AIf+ChRCmyZrdTrclIrSFCon6AC1NB09O8/ErolkhMWQt DeoG7pYDddmLHki+HmuWOGFy0X+ULiS7ytTC//qt81ZmhE6RVCc6kjIU3Lq4+pJX/i /SnGF29N28wQHu7oZ1J/73WJ4R3seuhJgIFjKV7KxVaa7Qaz78Bf67XiOTj17kYDB/ HSA1af5gU73zBep4r6mLt0spPnh0r2ieIya1zM1np/hk8PXZPzwmCEO0LD9Dxck53b QbxqhnT3EUneA== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4fSGpM6hYSz9rxF; Fri, 6 Mar 2026 20:35:23 +0100 (CET) From: Markus Probst Subject: [PATCH v2 0/4] rust: add basic serial device bus abstractions Date: Fri, 06 Mar 2026 19:35:26 +0000 Message-Id: <20260306-rust_serdev-v2-0-e9b23b42b255@posteo.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAGYsq2kC/1XMywrCMBCF4VcpszaSGXKprvoeUkSa0WbTlCQGp eTdjcWNy//A+TZIHD0nOHcbRC4++bC0oEMH03xbHiy8aw0kSSOhFfGZ8rWdHBfBrFWPfJK9nqA 91sh3/9q1y9h69imH+N7xgt/155D8cwoKKVgpo7Q11hAOa0iZw9ExjLXWD6X1GMSmAAAA X-Change-ID: 20251217-rust_serdev-ee5481e9085c To: Rob Herring , Greg Kroah-Hartman , Jiri Slaby , Miguel Ojeda , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Kari Argillander , "Rafael J. Wysocki" , Viresh Kumar , Boqun Feng , David Airlie , Simona Vetter , Boqun Feng Cc: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-pm@vger.kernel.org, driver-core@lists.linux.dev, dri-devel@lists.freedesktop.org, Markus Probst X-Developer-Signature: v=1; a=openpgp-sha256; l=2506; i=markus.probst@posteo.de; h=from:subject:message-id; bh=xpWbvmX/68bsH1i658qcmKhe/9CQa5oJlgpDVyhNyN4=; b=owEBiQJ2/ZANAwAIATR2H/jnrUPSAcsmYgBpqyxvaOkYQEc9V0YDz9t8adWRGTpFrcIU6vZn6 VT/4086CUKJAk8EAAEIADkWIQSCdBjE9KxY53IwxHM0dh/4561D0gUCaassbxsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMSwyLDIACgkQNHYf+OetQ9JmGRAAqzrcVe1vztX6oTQKAE8f7fKWohYJrqa iwfZGAkUiSWY5N3CT4GziJYcDnPoRUx5PPBrQ4MkwPEqGAU+DIV8jEojke6w/CzdW3OfYqc3wQA QXPzQ223YBuQljDGehM+MQBtU2t7KVLhw7PFO/LLC84qaW+d7N43BjYJy+5O4caP898wx9kNfT7 k3mG2yctS7Lig8xVhi7jCG81sw5d/FvaHw55xFL5bKC0EoKB349Plr7HlnIef8mHfOA12V9i7f1 iQbm8XuskxGWgEYFur9gn7WgWTbJDuYg1YqiHvDhYz1Js9ZsAP7D+H2gBBzIMTqewTMb42B1FuZ 0JVcHFoNYqnqlO0zFa5jyQDNDhqHuibTb05yyjUKgy4Fr3D3whGZ0u/YCQ05LLNoEWXSn8SATUy 2ReH9WPetkPkdfLtLejkGNnOQ5uxLO9giahswZZDiUnxZiaCw4Ce89umO3fh3NgITUQtgnmszB4 39L1JEPqRLvgT2yn6cusO13LiZzH9yXLzbNlx0yEbIgdppnRjzfNXACrnK/yfty06DpAvwikPOJ EHcxRN+zqKLZyRXM63THKFcOuGY7/1BWBhpnGKTz0HukDJ3iv+YktyK8G3n0U6Tr4vrSVLktCuP Ak+Vx36bt1FZNP5syJ7lHGVXUx/jaZTvJDxlgAqnyMR7xznbFXBo= X-Developer-Key: i=markus.probst@posteo.de; a=openpgp; fpr=827418C4F4AC58E77230C47334761FF8E7AD43D2 Autocrypt: addr=markus.probst@posteo.de; prefer-encrypt=mutual; keydata=xsFNBGiDvXgBEADAXUceKafpl46S35UmDh2wRvvx+UfZbcTjeQOlSwKP7YVJ4JOZrVs93qReNLkO WguIqPBxR9blQ4nyYrqSCV+MMw/3ifyXIm6Pw2YRUDg+WTEOjTixRCoWDgUj1nOsvJ9tVAm76Ww+ /pAnepVRafMID0rqEfD9oGv1YrfpeFJhyE2zUw3SyyNLIKWD6QeLRhKQRbSnsXhGLFBXCqt9k5JA RhgQof9zvztcCVlT5KVvuyfC4H+HzeGmu9201BVyihJwKdcKPq+n/aY5FUVxNTgtI9f8wIbmfAja oT1pjXSp+dszakA98fhONM98pOq723o/1ZGMZukyXFfsDGtA3BB79HoopHKujLGWAGskzClwTjRQ xBqxh/U/lL1pc+0xPWikTNCmtziCOvv0KA0arDOMQlyFvImzX6oGVgE4ksKQYbMZ3Ikw6L1Rv1J+ FvN0aNwOKgL2ztBRYscUGcQvA0Zo1fGCAn/BLEJvQYShWKeKqjyncVGoXFsz2AcuFKe1pwETSsN6 OZncjy32e4ktgs07cWBfx0v62b8md36jau+B6RVnnodaA8++oXl3FRwiEW8XfXWIjy4umIv93tb8 8ekYsfOfWkTSewZYXGoqe4RtK80ulMHb/dh2FZQIFyRdN4HOmB4FYO5sEYFr9YjHLmDkrUgNodJC XCeMe4BO4iaxUQARAQABzRdtYXJrdXMucHJvYnN0QHBvc3Rlby5kZcLBkQQTAQgAOxYhBIJ0GMT0 rFjncjDEczR2H/jnrUPSBQJog714AhsDBQsJCAcCAiICBhUKCQgLAgQWAgMBAh4HAheAAAoJEDR2 H/jnrUPSgdkQAISaTk2D345ehXEkn5z2yUEjaVjHIE7ziqRaOgn/QanCgeTUinIv6L6QXUFvvIfH 1OLPwQ1hfvEg9NnNLyFezWSy6jvoVBTIPqicD/r3FkithnQ1IDkdSjrarPMxJkvuh3l7XZHo49GV HQ8i5zh5w4YISrcEtE99lJisvni2Jqx7we5tey9voQFDyM8jxlSWv3pmoUTCtBkX/eKHJXosgsuS B4TGDCVPOjla/emI5c9MhMG7O4WEEmoSdPbmraPw66YZD6uLyhV4DPHbiDWRzXWnClHSyjB9rky9 lausFxogvu4l9H+KDsXIadNDWdLdu1/enS/wDd9zh5S78rY2jeXaG4mnf4seEKamZ7KQ6FIHrcyP ezdDzssPQcTQcGRMQzCn6wP3tlGk7rsfmyHMlFqdRoNNv+ZER/OkmZFPW655zRfbMi0vtrqK2Awm 9ggobb1oktfd9PPNXMUY+DNVlgR2G7jLnenSoQausLUm0pHoNE8TWFv851Y6SOYnvn488sP1Tki5 F3rKwclawQFHUXTCQw+QSh9ay8xgnNZfH+u9NY7w3gPoeKBOAFcBc2BtzcgekeWS8qgEmm2/oNFV G0ivPQbRx8FjRKbuF7g3YhgNZZ0ac8FneuUtJ2PkSIFTZhaAiC0utvxk0ndmWFiW4acEkMZGrLaM L2zWNjrqwsD2zsFNBGiDvXgBEADCXQy1n7wjRxG12DOVADawjghKcG+5LtEf31WftHKLFbp/HArj BhkT6mj+CCI1ClqY+FYU5CK/s0ScMfLxRGLZ0Ktzawb78vOgBVFT3yB1yWBTewsAXdqNqRooaUNo 8cG/NNJLjhccH/7PO/FWX5qftOVUJ/AIsAhKQJ18Tc8Ik73v427EDxuKb9mTAnYQFA3Ev3hAiVbO 6Rv39amVOfJ8sqwiSUGidj2Fctg2aB5JbeMln0KCUbTD1LhEFepeKypfofAXQbGwaCjAhmkWy/q3 IT1mUrPxOngbxdRoOx1tGUC0HCMUW1sFaJgQPMmDcR0JGPOpgsKnitsSnN7ShcCr1buel7vLnUMD +TAZ5opdoF6HjAvAnBQaijtK6minkrM0seNXnCg0KkV8xhMNa6zCs1rq4GgjNLJue2EmuyHooHA4 7JMoLVHcxVeuNTp6K2+XRx0Pk4e2Lj8IVy9yEYyrywEOC5XRW37KJjsiOAsumi1rkvM7QREWgUDe Xs0+RpxI3QrrANh71fLMRo7LKRF3Gvw13NVCCC9ea20P4PwhgWKStkwO2NO+YJsAoS1QycMi/vKu 0EHhknYXamaSV50oZzHKmX56vEeJHTcngrM8R1SwJCYopCx9gkz90bTVYlitJa5hloWTYeMD7FNj Y6jfVSzgM/K4gMgUNDW/PPGeMwARAQABwsF2BBgBCAAgFiEEgnQYxPSsWOdyMMRzNHYf+OetQ9IF AmiDvXgCGwwACgkQNHYf+OetQ9LHDBAAhk+ab8+WrbS/b1/gYW3q1KDiXU719nCtfkUVXKidW5Ec Idlr5HGt8ilLoxSWT2Zi368iHCXS0WenGgPwlv8ifvB7TOZiiTDZROZkXjEBmU4nYjJ7GymawpWv oQwjMsPuq6ysbzWtOZ7eILx7cI0FjQeJ/Q2baRJub0uAZNwBOxCkAS6lpk5Fntd2u8CWmDQo4SYp xeuQ+pwkp0yEP30RhN2BO2DXiBEGSZSYh+ioGbCHQPIV3iVj0h6lcCPOqopZqyeCfigeacBI0nvN jHWz/spzF3+4OS+3RJvoHtAQmProxyGib8iVsTxgZO3UUi4TSODeEt0i0kHSPY4sCciOyXfAyYoD DFqhRjOEwBBxhr+scU4C1T2AflozvDwq3VSONjrKJUkhd8+WsdXxMdPFgBQuiKKwUy11mz6KQfcR wmDehF3UaUoxa+YIhWPbKmycxuX/D8SvnqavzAeAL1OcRbEI/HsoroVlEFbBRNBZLJUlnTPs8ZcU 4+8rq5YX1GUrJL3jf6SAfSgO7UdkEET3PdcKFYtS+ruV1Cp5V0q4kCfI5jk25iiz8grM2wOzVSsc l1mEkhiEPH87HP0whhb544iioSnumd3HJKL7dzhRegsMizatupp8D65A2JziW0WKopa1iw9fti3A aBeNN4ijKZchBXHPgVx+YtWRHfcm4l8= OpenPGP: url=https://posteo.de/keys/markus.probst@posteo.de.asc; preference=encrypt This patch series adds the serdev device bus rust abstraction into the kernel. This abstraction will be used by a driver, which targets the MCU devices in Synology devices. Kari Argillander also messaged me, stating that he wants to write a watchdog driver with this abstraction (needing initial device data). @Rob: Are you willing to maintain these rust abstractions yourself, as you are the expert on this subsystem, otherwise I would take care of it with a "SERIAL DEVICE BUS [RUST]" section in the MAINTAINERS file. In the second case, I assume you are going to pick those patches as-is into your tree, after they have been reviewed? Signed-off-by: Markus Probst --- Changes in v2: - fix documentation in `serdev::Driver::write` and `serdev::Driver::write_all` - remove use of `dev_info` in probe from the sample - remove `properties_parse` from the sample - add optional `baudrate` property to the sample - remove 1. patch - remove `TryFrom<&device::Device> for &serdev::Device` implementation - fix import style - add patch to return reference in `devres::register` to fix safety issue - add patch to add private data to serdev_device, to fix `Device.drvdata()` from failing - simplify abstraction by removing ability to receive the initial transmission. It may be added later in a separate patch series if needed. - Link to v1: https://lore.kernel.org/r/20251220-rust_serdev-v1-0-e44645767621@posteo.de --- Markus Probst (4): rust: devres: return reference in `devres::register` serdev: add private data to serdev_device rust: add basic serial device bus abstractions samples: rust: add Rust serial device bus sample device driver include/linux/serdev.h | 14 +- rust/bindings/bindings_helper.h | 1 + rust/helpers/helpers.c | 1 + rust/helpers/serdev.c | 22 ++ rust/kernel/cpufreq.rs | 3 +- rust/kernel/devres.rs | 15 +- rust/kernel/drm/driver.rs | 3 +- rust/kernel/lib.rs | 2 + rust/kernel/serdev.rs | 533 +++++++++++++++++++++++++++++++++++++ samples/rust/Kconfig | 11 + samples/rust/Makefile | 1 + samples/rust/rust_driver_serdev.rs | 86 ++++++ 12 files changed, 682 insertions(+), 10 deletions(-) --- base-commit: 11439c4635edd669ae435eec308f4ab8a0804808 change-id: 20251217-rust_serdev-ee5481e9085c