From mboxrd@z Thu Jan 1 00:00:00 1970 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 C47961917F1; Tue, 24 Feb 2026 05:30:52 +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=1771911052; cv=none; b=EB/7iTdUvY7RqC1sOXHw3wF2JNiIZFgKMlA3YFI+0mH8EOqVYQS94b1ZDGs/rwDKQp06rLe484cEsVTnA/+7FiY47IgoEDpTf6UaJP2P2QeZ4CiS9ys4qKkP8q6hJVsovH+ojIa6vd/9DszCgSNjRmb/URh5dzGwnUZW/6U8i4g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771911052; c=relaxed/simple; bh=vHdj4hh+S9toSEoaqsyFG1+YlfiQ88QjpMwJdxwcVKw=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=EHukVlOvLLYtVQJ3bpdmd3qZ8RqhrUeT0LwRyge9LEqlk9Aj/qOLxmVQps/OwABa2LQlGiUJtILMu+cOe3VNGFxiwipnzSPp4jkvVbjwbojnFzhL5yOPCDCAnYRD+L+Oh3LLarYDRLJoPSLJnRR/JNE6kf7t5W3iWqNKHK3lMZk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=L+tKSlMM; 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="L+tKSlMM" Received: by smtp.kernel.org (Postfix) with ESMTPS id 86FC2C2BCB0; Tue, 24 Feb 2026 05:30:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771911052; bh=vHdj4hh+S9toSEoaqsyFG1+YlfiQ88QjpMwJdxwcVKw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=L+tKSlMMT5r6dc2EMjgCGCq9a59fjbudd7g4l1yW3qtkpGcf01ND92z1k8iKKH7T9 mJWL9OD4gaDEJaTABJ0hI9KdKN2PDVkxpxoSS1q3KBNosXQkSrhJGjfyn/BQyFN7nk a3HR8WewK58BhSJGJqkvJsTTLyCFGHjZAE0dhLaNdZ2wAw1PGTt/RgKZ9gBlUbo3u+ bKnFROsYxjv2adEu8kalrWHmKyztOYBUxepBo1q/1d2LdQ22nxGckgB7WXKakxf9oS 87C0iVnS62nNRJ/WvgFSOfIwzgamQhFkPuHZr29NfESE/yZZrP6I9YDai8LSoRcBl7 hSCT4UhtMxcqQ== 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 78160EFB7FF; Tue, 24 Feb 2026 05:30:52 +0000 (UTC) From: Manivannan Sadhasivam via B4 Relay Date: Tue, 24 Feb 2026 11:00:48 +0530 Subject: [PATCH v5 2/9] serdev: Add an API to find the serdev controller associated with the devicetree node Precedence: bulk X-Mailing-List: linux-arm-msm@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: <20260224-pci-m2-e-v5-2-dd9b9501d33c@oss.qualcomm.com> References: <20260224-pci-m2-e-v5-0-dd9b9501d33c@oss.qualcomm.com> In-Reply-To: <20260224-pci-m2-e-v5-0-dd9b9501d33c@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 X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=2175; i=manivannan.sadhasivam@oss.qualcomm.com; h=from:subject:message-id; bh=ZvwvgoFlf4z/ag5/olaI5ILEIEPSFo6zg+vO7wuanOo=; b=owEBbQGS/pANAwAKAVWfEeb+kc71AcsmYgBpnTeIa56ffrPgmNucV18RPYqRHO94dF3VIWvvp Zp7yqucqEWJATMEAAEKAB0WIQRnpUMqgUjL2KRYJ5dVnxHm/pHO9QUCaZ03iAAKCRBVnxHm/pHO 9QihB/4pXR5cfUc1yznfMiQgbOZgzBXVtinCek2mr0WZVDia+3o/PbEyb03v5G1SyzX7+yxoOKA UNAe/ugQlDvJuSaXmmKeZ2dnbghjwiqQpVGdTH6He1icNr0ieEQLGk/kk0g2R8SsIiP6DfF6bdd aIF71gAd45wbJE5TTyrtEzID7oTSxBeBxBq45T1pSxXD+gATuUn8RC8BJ3i74DL4xg0Oz1dUkGi 5KHBd3mSW7rwzoBPSseevM7nCO4+l9fw/LN2hiVA17m9J1mA9gA4qxX4AMGPM0hogrrkE6GO9gw gwle1YNRoxaCtGCSnMvsfLTYLHl+pX58DEkQFkEnANIR9Kws 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) Signed-off-by: Manivannan Sadhasivam --- 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(struct device *host, } EXPORT_SYMBOL_GPL(serdev_controller_alloc); +#ifdef CONFIG_OF +/** + * of_find_serdev_controller_by_node() - Find the serdev controller associated + * 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 = bus_find_device_by_of_node(&serdev_bus_type, node); + + return (dev && dev->type == &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(struct acpi_resource *ares, } #endif /* CONFIG_ACPI */ +#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 */ -- 2.51.0