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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by DM6NAM11FT026.mail.protection.outlook.com (10.13.172.161) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.5723.20 via Frontend Transport; Wed, 12 Oct 2022 18:14:31 +0000 Received: from SATLEXMB04.amd.com (10.181.40.145) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.28; Wed, 12 Oct 2022 13:14:30 -0500 Received: from xsjlizhih40.xilinx.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server id 15.1.2375.28 via Frontend Transport; Wed, 12 Oct 2022 13:14:29 -0500 From: Lizhi Hou To: , , , , , CC: Lizhi Hou , , , , , , , Subject: [PATCH RFC V2 1/3] of: dynamic: Add of_create_node() and of_destroy_node() Date: Wed, 12 Oct 2022 11:13:58 -0700 Message-ID: <1665598440-47410-2-git-send-email-lizhi.hou@amd.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1665598440-47410-1-git-send-email-lizhi.hou@amd.com> References: <1665598440-47410-1-git-send-email-lizhi.hou@amd.com> MIME-Version: 1.0 Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT026:EE_|SJ0PR12MB6830:EE_ X-MS-Office365-Filtering-Correlation-Id: c3082ea0-b394-43e6-bbec-08daac7d9bf5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Oct 2022 18:14:31.3027 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c3082ea0-b394-43e6-bbec-08daac7d9bf5 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT026.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB6830 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org of_create_node() creates device node and apply to base tree dynamically. The parent device node and full name are required for creating the node. And the caller can also provide a property array for the node. Inside this function, it creates a changeset. Then the new device node and properties are added to the changeset and applied to base tree. The pointer of this changeset is saved in device node private data. of_destroy_node() removes the node created by of_create_node() from the base tree and free it. It gets the changeset pointer from device node private data and call of_changeset_destroy() to free everything. Signed-off-by: Lizhi Hou Signed-off-by: Sonal Santan Signed-off-by: Max Zhen Signed-off-by: Brian Xu --- drivers/of/dynamic.c | 80 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/of.h | 4 +++ 2 files changed, 84 insertions(+) diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c index cd3821a6444f..eca28b723706 100644 --- a/drivers/of/dynamic.c +++ b/drivers/of/dynamic.c @@ -934,3 +934,83 @@ int of_changeset_action(struct of_changeset *ocs, unsigned long action, return 0; } EXPORT_SYMBOL_GPL(of_changeset_action); + +/** + * of_create_node - Dynamically create a device node and apply it to base tree + * + * @parent: Pointer to parent device node + * @full_name: Full name of device node + * @props: Pointer to property array + * + * Return: Pointer to the created device node or NULL in case of an error. + */ +struct device_node *of_create_node(struct device_node *parent, + const char *full_name, + struct property *props) +{ + struct of_changeset *cset; + struct property *new_pp; + struct device_node *np; + int ret, i; + + cset = kzalloc(sizeof(*cset), GFP_KERNEL); + if (!cset) + return NULL; + + of_changeset_init(cset); + + np = __of_node_dup(NULL, full_name); + if (!np) + goto failed; + np->parent = parent; + + ret = of_changeset_attach_node(cset, np); + if (ret) + goto failed; + + if (props) { + for (i = 0; props[i].name; i++) { + new_pp = __of_prop_dup(&props[i], GFP_KERNEL); + if (!new_pp) + goto failed; + ret = of_changeset_add_property(cset, np, new_pp); + if (ret) { + kfree(new_pp->name); + kfree(new_pp->value); + kfree(new_pp); + goto failed; + } + } + } + + ret = of_changeset_apply(cset); + if (ret) + goto failed; + + np->data = cset; + + return np; + +failed: + of_changeset_destroy(cset); + if (np) + of_node_put(np); + + return NULL; +} + +/** + * of_destroy_node - Destroy a dynamically created device node + * + * @np: Pointer to dynamically created device node + * + */ +void of_destroy_node(struct device_node *np) +{ + struct of_changeset *cset; + + cset = (struct of_changeset *)np->data; + of_changeset_destroy(cset); + of_node_put(np); + kfree(cset); +} diff --git a/include/linux/of.h b/include/linux/of.h index 766d002bddb9..493ef957c1a8 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -1475,6 +1475,10 @@ extern int of_changeset_revert(struct of_changeset *ocs); extern int of_changeset_action(struct of_changeset *ocs, unsigned long action, struct device_node *np, struct property *prop); +struct device_node *of_create_node(struct device_node *parent, + const char *full_name, + struct property *props); +void of_destroy_node(struct device_node *np); static inline int of_changeset_attach_node(struct of_changeset *ocs, struct device_node *np) -- 2.17.1