From nobody Fri Apr 3 00:00:49 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 9951433ADAC; Thu, 26 Mar 2026 08:06:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774512400; cv=none; b=pGopi+wxqmKjlpJtyxhQ/J+FOj5SVFwOd9935hkpHAdcjhxdv/hJ2JhDE3D4PO/6tCjk0Vw7Q7hTvbcToQVzMhWrWrCr+MOlveQMcdIUd+ghzJtmVupVJdp7eHIVJISnWPS+Uc54sbC4XXumMP2yMsyUvO3v4ZnIvGd8RApsqL4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774512400; c=relaxed/simple; bh=90rMoHNtpikEEOX4hxu7KxohYPZTjuhD8cCrdkwCho4=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=CJrNPvnsp9k4EW1l5pAZGjGUfb/VsViAAbGQWYCcBILAzN8DqVa7fZh5osQzWJsQfwtVvF7HsyZh1tIJyAxX8MeNydUOxZRr4hhatGOYli5oUqsBuDiqxC57HoGr4q0R7ntJTc2MRtlweBPalh0Bp0xKg+44yBFFnG4X3Y80ub4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VSUoMf7R; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="VSUoMf7R" Received: by smtp.kernel.org (Postfix) with ESMTPS id 6C1F4C2BCB1; Thu, 26 Mar 2026 08:06:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774512400; bh=90rMoHNtpikEEOX4hxu7KxohYPZTjuhD8cCrdkwCho4=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=VSUoMf7RhRL6XWXGd4mB8B+FTVTqYZfDUov0jI/YT+tcrFj+ZqPFSmCYkQgAij6od ZvMhHeQLKBsDKRVJ/VdKqApFKQegyaggZYQrqwTlSf4NsPyxfo+ReuW3afaP66NqYn fs1N2SReU+iI5+bblk1v0A2Qq395tYa2zA8oSVhmoCFDE2eL6NVANUmYQPXkrboUN4 n/08EUj0c/EiET7vBeT1ptYl9DPCN9hD83CE/BfoGBZzNE1QNeUYZN8kxMkKbb8DUl L/pZOJ9by1ekkiAV5z0EL+hbPZlUhS4mmkl4yDUFZgbhwTBoPUAzYIsV7hhnIHPM8Z IAiHN910O4OoA== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 55653106F2F3; Thu, 26 Mar 2026 08:06:40 +0000 (UTC) From: Manivannan Sadhasivam via B4 Relay Date: Thu, 26 Mar 2026 13:36:30 +0530 Subject: [PATCH v7 2/8] serdev: Add an API to find the serdev controller associated with the devicetree node 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: quoted-printable Message-Id: <20260326-pci-m2-e-v7-2-43324a7866e6@oss.qualcomm.com> References: <20260326-pci-m2-e-v7-0-43324a7866e6@oss.qualcomm.com> In-Reply-To: <20260326-pci-m2-e-v7-0-43324a7866e6@oss.qualcomm.com> To: Rob Herring , Greg Kroah-Hartman , Jiri Slaby , Nathan Chancellor , Nicolas Schier , Hans de Goede , =?utf-8?q?Ilpo_J=C3=A4rvinen?= , Mark Pearson , "Derek J. Clark" , Manivannan Sadhasivam , Krzysztof Kozlowski , Conor Dooley , Marcel Holtmann , Luiz Augusto von Dentz , Bartosz Golaszewski , Andy Shevchenko , Bartosz Golaszewski Cc: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-bluetooth@vger.kernel.org, linux-pm@vger.kernel.org, Stephan Gerhold , Dmitry Baryshkov , linux-acpi@vger.kernel.org, Manivannan Sadhasivam , Hans de Goede , Bartosz Golaszewski X-Mailer: b4 0.15.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2248; i=manivannan.sadhasivam@oss.qualcomm.com; h=from:subject:message-id; bh=rr2lmVP0IC6lUnB67NHw0qDXlaCs5LnvUTeOalg9qug=; b=owEBbQGS/pANAwAKAVWfEeb+kc71AcsmYgBpxOkNFnPCY8rlImwmoav5x6RK0WOCh1k67UnkK tWxcXlgZmSJATMEAAEKAB0WIQRnpUMqgUjL2KRYJ5dVnxHm/pHO9QUCacTpDQAKCRBVnxHm/pHO 9XKQB/9CSXeRJwS5NhVSb4wiX3OflP1zFS299ahwT+wJ/WPmuWbeRd7xFOmfaCHyxHa3z7q4+Z4 uOwpqWolIy+p2mDbVuDufH1pTUjYCZ4V3z63MWM6tUB4cWaUqf0Bqv09LwOiaJ60fSvgGk3I8+3 /DhHBpnSID+mbL/nQxvlIqoWDvsi1RCHAl3TJzup7yyJq6507KDw3lXW2SesGmy1DnH3k96xt6i u2KunrYZaUQZx47kXE8MdNR3dQKI6oDdWNK+IjhhoHYmJUErD7jTq8Mmd33VXoKteKBL+Knjh5v RmR7FAslGJokUbE6ad1rbPmMnYzzLYQBQl2yY3iF+HY9GgYr X-Developer-Key: i=manivannan.sadhasivam@oss.qualcomm.com; a=openpgp; fpr=C668AEC3C3188E4C611465E7488550E901166008 X-Endpoint-Received: by B4 Relay for manivannan.sadhasivam@oss.qualcomm.com/default with auth_id=461 X-Original-From: Manivannan Sadhasivam Reply-To: manivannan.sadhasivam@oss.qualcomm.com From: Manivannan Sadhasivam Add of_find_serdev_controller_by_node() API to find the serdev controller device associated with the devicetree node. Tested-by: Hans de Goede # ThinkPad T14s = gen6 (arm64) Reviewed-by: Bartosz Golaszewski Signed-off-by: Manivannan Sadhasivam Reviewed-by: Rob Herring (Arm) --- drivers/tty/serdev/core.c | 19 +++++++++++++++++++ include/linux/serdev.h | 9 +++++++++ 2 files changed, 28 insertions(+) diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c index 8f25510f89b6..bf88b95f7458 100644 --- a/drivers/tty/serdev/core.c +++ b/drivers/tty/serdev/core.c @@ -514,6 +514,25 @@ struct serdev_controller *serdev_controller_alloc(stru= ct device *host, } EXPORT_SYMBOL_GPL(serdev_controller_alloc); =20 +#ifdef CONFIG_OF +/** + * of_find_serdev_controller_by_node() - Find the serdev controller associ= ated + * with the devicetree node + * @node: Devicetree node + * + * Return: Pointer to the serdev controller associated with the node. NULL= if + * the controller is not found. Caller is responsible for calling + * serdev_controller_put() to drop the reference. + */ +struct serdev_controller *of_find_serdev_controller_by_node(struct device_= node *node) +{ + struct device *dev =3D bus_find_device_by_of_node(&serdev_bus_type, node); + + return (dev && dev->type =3D=3D &serdev_ctrl_type) ? to_serdev_controller= (dev) : NULL; +} +EXPORT_SYMBOL_GPL(of_find_serdev_controller_by_node); +#endif + static int of_serdev_register_devices(struct serdev_controller *ctrl) { struct device_node *node; diff --git a/include/linux/serdev.h b/include/linux/serdev.h index 0c7d3c27d1f8..188c0ba62d50 100644 --- a/include/linux/serdev.h +++ b/include/linux/serdev.h @@ -334,4 +334,13 @@ static inline bool serdev_acpi_get_uart_resource(struc= t acpi_resource *ares, } #endif /* CONFIG_ACPI */ =20 +#ifdef CONFIG_OF +struct serdev_controller *of_find_serdev_controller_by_node(struct device_= node *node); +#else +static inline struct serdev_controller *of_find_serdev_controller_by_node(= struct device_node *node) +{ + return NULL; +} +#endif /* CONFIG_OF */ + #endif /*_LINUX_SERDEV_H */ --=20 2.51.0