From nobody Mon Feb 9 10:25:53 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 65C6C365A08; Mon, 12 Jan 2026 16:28:33 +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=1768235313; cv=none; b=CS5Q9rnh5j+23ReRfGY2DQ3p32KdNwgJoygxW7in2xckCL6pqpJRZ1Qq22jwV8lslo0o2kfHzjTOwCHVL0oqrRmPpVBdkAxxpKwuui1j98Vbx+FdXDEtXRTR22oajjKkBHUUJBwwQUqf9LiSftX0v54m6wDDdPfbDV2xp9z8HKs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768235313; c=relaxed/simple; bh=VwpIUgJ7TQ6NyHLOeJDcf/38Dl2NWNEcsZHgAexS5KQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=rszeTCG8rNTUTv3k74TFsOZKEv9jqQtfG/Gr4KTN18wrn47w4mlCaIymcMk9N11EykfkjebGAj6lUE6IMBlcyQYj3mPjSVCR0J2C0GfZbq8QOQSFMjlJDkdncWaBiOFQaFKc6M9k1RMNHhWAlDgWG4+X5wsyOXnelYTUqao+dUo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=l1jlFzrW; 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="l1jlFzrW" Received: by smtp.kernel.org (Postfix) with ESMTPS id 1ED2DC2BC86; Mon, 12 Jan 2026 16:28:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768235313; bh=VwpIUgJ7TQ6NyHLOeJDcf/38Dl2NWNEcsZHgAexS5KQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=l1jlFzrWXiR+bPz/tAoas97NLT3Sb/mzv/cNexBpkyN935yKgZXrwyX5hcKRvRWjW /7jdusQk9J3KQGxEtdTLD5ZSske7arq9+Iu5Ch8DZj9lY8up+xxNq1rIUNlri/FgCn 3vOXtBLeIfa3f4t8wxrsioZZcaZekECdmbd9t5rJ1/20S/t7yEmc1wtG3xnPqgLKor 4y57st7Z9mpvOpEGeY57j6kcJpyP2SRV5sPfInfvcbU/XQPCatGtwMUBAwXKGa7kPm AOSZzGf0ziGPBDfNzg9l346zshWCwOqdx4ULtHAja92RflyzlMgfhNeu7gcUjVvC48 OZouoGi8Vld1A== 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 11230C9EC9D; Mon, 12 Jan 2026 16:28:33 +0000 (UTC) From: Manivannan Sadhasivam via B4 Relay Date: Mon, 12 Jan 2026 21:56:01 +0530 Subject: [PATCH v4 2/9] 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: <20260112-pci-m2-e-v4-2-eff84d2c6d26@oss.qualcomm.com> References: <20260112-pci-m2-e-v4-0-eff84d2c6d26@oss.qualcomm.com> In-Reply-To: <20260112-pci-m2-e-v4-0-eff84d2c6d26@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 X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=1955; i=manivannan.sadhasivam@oss.qualcomm.com; h=from:subject:message-id; bh=J1VmrZOJOQw4R6fDrVVe/0GgAe/UzN5xgoimqww9n5Q=; b=owEBbQGS/pANAwAKAVWfEeb+kc71AcsmYgBpZSEtqgiwm1mkQDaD/Wb8/ZXVgx6a+CPfmCw+6 HFABhElf66JATMEAAEKAB0WIQRnpUMqgUjL2KRYJ5dVnxHm/pHO9QUCaWUhLQAKCRBVnxHm/pHO 9eMPCACobFxxteG5pdzS0luxGgzCXNtDCi5oiEXMX32Vb8bWtrZ6t6eXEP/LLe4esV0w1AiTKKk 6s5b9O2HMWDmQgjJOMSQl1ee7bmPg9QkbGIJnbs4Bhz+jCEGUAt4x3aNRE2Oi9CGeN37cG4HsB8 UK+Wd4Y2JHpUYg/Pyt85++38RT6kG0/RTLg0apGiKZf0jCGUbAu9+1aw2yReUTLJ5H1HKNYjxHI HPuc55LD9SuUMtuAbvxzkxj9XNeO+KgY5yLfxprgHSmvlGkNxbTWmxOPCZ4hMQ9sipJvTCu5yWd 04yiZzfEKcRICb2XsaVVDdU/yohakOQ8Bjl6pY2KGzqw6lxD 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. Signed-off-by: Manivannan Sadhasivam --- drivers/tty/serdev/core.c | 16 ++++++++++++++++ include/linux/serdev.h | 9 +++++++++ 2 files changed, 25 insertions(+) diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c index b33e708cb245..25382c2d63e6 100644 --- a/drivers/tty/serdev/core.c +++ b/drivers/tty/serdev/core.c @@ -504,6 +504,22 @@ struct serdev_controller *serdev_controller_alloc(stru= ct device *host, } EXPORT_SYMBOL_GPL(serdev_controller_alloc); =20 +/** + * 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. + */ +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); + 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 ecde0ad3e248..db9bfaba0662 100644 --- a/include/linux/serdev.h +++ b/include/linux/serdev.h @@ -333,4 +333,13 @@ 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 +struct serdev_controller *of_find_serdev_controller_by_node(struct device_= node *node) +{ + return NULL; +} +#endif /* CONFIG_OF */ + #endif /*_LINUX_SERDEV_H */ --=20 2.48.1