From nobody Sun Nov 24 17:35:53 2024 Received: from relay8-d.mail.gandi.net (relay8-d.mail.gandi.net [217.70.183.201]) (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 F1E401C5793; Mon, 4 Nov 2024 17:20:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730740813; cv=none; b=qB1uaULEZv0dACNBAftN+Z3c0yfxyeVJf7J4P8IcAW2G4m55d+dqXzTTuVfvUTfENDoIhQXGtfuh/0SwC13J295cjkQ83qNOBoj7JmyD0t4sPFhFTidsSOVXEhndLHIfCvR5pqNAPEC8ZurW7JZ9IQTeI0CgSUY4cQD0+0tjnuM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730740813; c=relaxed/simple; bh=hiS6n9pheg1VmpHKj++eyaK6UcsY7Peml+xl4mdMBQA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hHnFaL6GAaf/StoZJuZQPYQfBQwvgZ1uuBHYUrZX6ZlUbbE6aiX7a6Py98Ho6t/mjCf6foUzhQcQzW6cV6yMUxE9hjQSU4lXk/jXr+kWccbaeJ0o1JJu4/3ylIco8bnjrMJ8dHp30XAR975ZSmPhcGV3b5i+lmkmD5dtRft0iAA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=gwe7fO99; arc=none smtp.client-ip=217.70.183.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="gwe7fO99" Received: by mail.gandi.net (Postfix) with ESMTPA id 8FE281BF20B; Mon, 4 Nov 2024 17:20:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1730740809; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=xXuggkRMR/uQkcFh5AavFOlwv1DgC3rb6WoS70TIrr8=; b=gwe7fO991rjyA85LZ0ZKf8j1ola4vp/LSTDZGWfeHhi7UE2VzKCUenKz/AMVBUh6bPXZAA yNP8Mq4MAiZrWA54Jx0VN7rklMJ2kgKj0/5QbTtfZMroO9SD5WVPETK6N1DIC0OmVEpy7h g433FByH+AIOPf0XUthCb6l2PAAMNuJBRh7J1ZAsfhwKQU6I/Z+ZwnPwlqOQKXBL1BUb+c xwlmj+jNuMTX09X/v5KnPX9WmnM1Q4rQxJqer0WzDF9fzRuRJAuJsk9cklSEG+tpdX0Xsm 5zDyLyX5gVjRpWeKtOlAel2TDLVpceM8wAMJsZmlpv7sh0rRvDMD3Nx0IUeM1Q== From: Herve Codina To: Greg Kroah-Hartman , "Rafael J. Wysocki" , Rob Herring , Saravana Kannan , Bjorn Helgaas , Lizhi Hou Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-pci@vger.kernel.org, Allan Nielsen , Horatiu Vultur , Steen Hegelund , Thomas Petazzoni , Herve Codina , stable@vger.kernel.org Subject: [PATCH 1/6] driver core: Introduce device_{add,remove}_of_node() Date: Mon, 4 Nov 2024 18:19:55 +0100 Message-ID: <20241104172001.165640-2-herve.codina@bootlin.com> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241104172001.165640-1-herve.codina@bootlin.com> References: <20241104172001.165640-1-herve.codina@bootlin.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-GND-Sasl: herve.codina@bootlin.com Content-Type: text/plain; charset="utf-8" An of_node can be set to a device using device_set_node(). This function cannot prevent any of_node and/or fwnode overwrites. When adding an of_node on an already present device, the following operations need to be done: - Attach the of_node if no of_node were already attached - Attach the of_node as a fwnode if no fwnode were already attached This is the purpose of device_add_of_node(). device_remove_of_node() reverts the operations done by device_add_of_node(). Cc: stable@vger.kernel.org Signed-off-by: Herve Codina --- drivers/base/core.c | 52 ++++++++++++++++++++++++++++++++++++++++++ include/linux/device.h | 2 ++ 2 files changed, 54 insertions(+) diff --git a/drivers/base/core.c b/drivers/base/core.c index 24c572031403..0aa63371f55d 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -5118,6 +5118,58 @@ void set_secondary_fwnode(struct device *dev, struct= fwnode_handle *fwnode) } EXPORT_SYMBOL_GPL(set_secondary_fwnode); =20 +/** + * device_remove_of_node - Remove an of_node from a device + * @dev: device whose device-tree node is being removed + */ +void device_remove_of_node(struct device *dev) +{ + dev =3D get_device(dev); + if (!dev) + return; + + if (!dev->of_node) + goto end; + + if (dev->fwnode =3D=3D of_fwnode_handle(dev->of_node)) + dev->fwnode =3D NULL; + + of_node_put(dev->of_node); + dev->of_node =3D NULL; + +end: + put_device(dev); +} +EXPORT_SYMBOL_GPL(device_remove_of_node); + +/** + * device_add_of_node - Add an of_node to an existing device + * @dev: device whose device-tree node is being added + * @of_node: of_node to add + */ +void device_add_of_node(struct device *dev, struct device_node *of_node) +{ + if (!of_node) + return; + + dev =3D get_device(dev); + if (!dev) + return; + + if (WARN(dev->of_node, "%s: Cannot replace node %pOF with %pOF\n", + dev_name(dev), dev->of_node, of_node)) + goto end; + + dev->of_node =3D of_node_get(of_node); + + if (!dev->fwnode) + dev->fwnode =3D of_fwnode_handle(of_node); + +end: + put_device(dev); +} +EXPORT_SYMBOL_GPL(device_add_of_node); + /** * device_set_of_node_from_dev - reuse device-tree node of another device * @dev: device whose device-tree node is being set diff --git a/include/linux/device.h b/include/linux/device.h index b4bde8d22697..e3aa25ce1f90 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -1146,6 +1146,8 @@ int device_online(struct device *dev); void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode); void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode= ); void device_set_node(struct device *dev, struct fwnode_handle *fwnode); +void device_add_of_node(struct device *dev, struct device_node *of_node); +void device_remove_of_node(struct device *dev); void device_set_of_node_from_dev(struct device *dev, const struct device *= dev2); =20 static inline struct device_node *dev_of_node(struct device *dev) --=20 2.46.2