From patchwork Mon Aug 26 02:43:28 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kuninori Morimoto X-Patchwork-Id: 822986 Received: from OS0P286CU011.outbound.protection.outlook.com (mail-japanwestazon11010058.outbound.protection.outlook.com [52.101.228.58]) (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 B99BEEED6; Mon, 26 Aug 2024 02:43:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.228.58 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724640214; cv=fail; b=GPEu4lxPg1P6a/ttsTxQgcmfCeSA348naa6+wppBPOagFX/KOhXB0Q8lUfJsv3/r8BqaMBDt7Uat/mAN9mL4ly1t/ZpkYWC3zcIcNuegAlgvI7yqe1YGsAK2lKsi5zkFIYd0DLDWb4kWEfQyQLLYO7lzpFj/gYb7d9b/Ev5QhR4= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724640214; c=relaxed/simple; bh=Bcel8HvG6Hat2pakRRiuBzebbcMFSe1+sn15NIoHN+A=; h=Message-ID:From:Subject:To:In-Reply-To:References:Content-Type: Date:MIME-Version; b=fWTlOXDg76EhHYSZC/V+/YOiHYjchvpzbS9FTHxcPhgFPtUg59Y6f4FqzPg+XIKxYAcqb85IPT/4Cd9cahLqYHvlmp77ZKB2+Zdjy6v9jl2XOO2UpmrGtvkOc2DPmyuEXqljZTT+jTZ/CXQlpJfqnS4rYaCuGHcfG7ri1a6Ueq4= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=renesas.com; spf=pass smtp.mailfrom=renesas.com; dkim=pass (1024-bit key) header.d=renesas.com header.i=@renesas.com header.b=KEIugbhB; arc=fail smtp.client-ip=52.101.228.58 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=renesas.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=renesas.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=renesas.com header.i=@renesas.com header.b="KEIugbhB" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=JgCDIBii9dWeqgfU3/102jPf34i7vazgXiB3XTWCYwSy5kg2nTCIw9FwcHXRC4VP284FVlct92YNaf3YZHXVS3sdZs1CdDYA8xZAk4F49YCV7Aeirn9QwOSl3pyEC3u8Ht8accum3GLyDPTlzFLLNor+PoIp4LgbGQkrVsGdpCR77zwt+H2n1JsUiGGl6byg+IBU5XZxY1hLX3Ifnu/Qrll211U6IdbIhhW+UwRzHegOj690hp/phB1/rwl1Mt3oHKvGZMDZdrgYvBQ0q9KY/PNlu5VKB6ls3Z/kBIWmIb6uOSQoofLrOLa6h7RataZeRlKNa0ryrD0YfDvGqalrGg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=u5wCXam7eyk+9ZHVTp2xwx/12vJhqGXCaR39njBrXpE=; b=OEol569a6ss1hjtJKoTZ16SrsPgYvr549moHzs5DaUMRkKlJQcpNwvi598x6qJoT1j23EKFklISm48Dpur1lak4BHIlwDEsL+FVvYhBcMjIdzkdBHYkpu5laMDEHbeH/sl2U0gshWvV30BizBA3N4nwSioJFtlzxkoIB66+/QJ1R6NJMOcx1CZxQRMTGbhyCjuDnSZ59rMAxr8qt9Tfy/y+I2OhIdPoRf1jhXjdQZk5VUjk31uUmxKwzdekC8ujmVuHEksmPReAkehD5UvriDX7TykjYF32qNFO0iQP2GvWyEJDJB0/5ZarkxpvL3A0RvUtj1NEF2NhZxzxjpdLcBQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=renesas.com; dmarc=pass action=none header.from=renesas.com; dkim=pass header.d=renesas.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=renesas.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=u5wCXam7eyk+9ZHVTp2xwx/12vJhqGXCaR39njBrXpE=; b=KEIugbhB0oEwdReQLeUZ2wg3Ik4pb8oeeoIXEDKPCGarSKM7EQW+/NkFEbcEEPfet0JZgRmC/E0eDqXEfX1CsgoR+RGhVAp6pgXFdBFJ1aEBE3Fpl72e1lWk0Fd/lycgWxXRJB2t/+GPngi9E/7irpk+YhMmzaGorbBXV0IHxYs= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=renesas.com; Received: from TYCPR01MB10914.jpnprd01.prod.outlook.com (2603:1096:400:3a9::11) by TYCPR01MB10616.jpnprd01.prod.outlook.com (2603:1096:400:290::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7897.24; Mon, 26 Aug 2024 02:43:28 +0000 Received: from TYCPR01MB10914.jpnprd01.prod.outlook.com ([fe80::c568:1028:2fd1:6e11]) by TYCPR01MB10914.jpnprd01.prod.outlook.com ([fe80::c568:1028:2fd1:6e11%5]) with mapi id 15.20.7875.016; Mon, 26 Aug 2024 02:43:28 +0000 Message-ID: <87a5h0qa0g.wl-kuninori.morimoto.gx@renesas.com> From: Kuninori Morimoto Subject: [PATCH v3 2/9] of: property: add of_graph_get_next_port_endpoint() User-Agent: Wanderlust/2.15.9 Emacs/29.3 Mule/6.0 To: Daniel Vetter , David Airlie , Helge Deller , Jaroslav Kysela , Laurent Pinchart , Liam Girdwood , Maarten Lankhorst , Mark Brown , Mauro Carvalho Chehab , Maxime Ripard , Michal Simek , Rob Herring , Saravana Kannan , Takashi Iwai , Thomas Zimmermann , Tomi Valkeinen , devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-fbdev@vger.kernel.org, linux-media@vger.kernel.org, linux-omap@vger.kernel.org, linux-sound@vger.kernel.org, Sakari Ailus In-Reply-To: <87cylwqa12.wl-kuninori.morimoto.gx@renesas.com> References: <87cylwqa12.wl-kuninori.morimoto.gx@renesas.com> Date: Mon, 26 Aug 2024 02:43:28 +0000 X-ClientProxiedBy: TYBP286CA0031.JPNP286.PROD.OUTLOOK.COM (2603:1096:404:10a::19) To TYCPR01MB10914.jpnprd01.prod.outlook.com (2603:1096:400:3a9::11) Precedence: bulk X-Mailing-List: linux-omap@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: TYCPR01MB10914:EE_|TYCPR01MB10616:EE_ X-MS-Office365-Filtering-Correlation-Id: 8ae6722a-8a7c-4b68-a1ce-08dcc578dd8c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|1800799024|52116014|7416014|376014|366016|38350700014|921020; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:TYCPR01MB10914.jpnprd01.prod.outlook.com; PTR:; CAT:NONE; SFS:(13230040)(1800799024)(52116014)(7416014)(376014)(366016)(38350700014)(921020); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: ySCMOO0dlCHMRkwdjVj7d4mp09/K8QZtLqAVsY1E1a1un1FXetApBPSOGMkD7U8MIAKE45VvQj8pLir4lynfOpS9jcF0KKB9GbZIpIOqaa4SX03k9Uk8DitcAuDwCeGs5VlA/XclqMFBM0jypusAIKzmh+LpK6NaGkNlB66SdAmJF3cV0xWBM6JI6tEJfSfv/5qNWwdTFwsOLyXlo+zNsi0A8LdTtHQpg7hPhJGDTcXkMgvh3VZCPNYypDegeL0tZPme1/QC+tLHE4d/Nsdu9/DTekroGl2p5IHXw8RTVcSvgjkPpqcSoAcIurTXp9VNf+CHWGYivVnPIEYn49Xmft6sS2rc9fUiR3HiWLf9o8W7BX4oNYcpVHtYHBlnIwi+TWzzrm4ShTcSu3ThR2FvewaqqFLFl/Azxr/nWP2623O//Q4DByCrYP5Le30RSvPAKiKvIbgJWEBMsLyalZLghDqP7WyeoKUK/bAg5vgTnIFThuyjj2NbFDCfYkDQ8jK2efAY4WXNh1vYPoB3bBYmGbNqWjXqtKZy4T7pMXR9ERjjuPS98S+Dzr67TeJ9omV3N88YMxtDIHCr8lkVvmjKCO9BvTeQtLk2PeKIYaOp86Wt3AOk4b9l7zge6tz9YX/8ctj1VR73TFAGgyzJiW+N2vPjPzb+OJFD4vow8zYycMWp3gsacCDiO3llrYeDt7m+LyYLgxdeOYenZ9QZQliDVTBQyRlbyDgr2Tj4IojANmbQbgq47WdUiwZ56UF8yvufTquMFr0bf3Pg5fYsZDAaD97MxVsL1mU0AmG5tBhhUe20gi6UakX04qvHVHHreE0IQ6MDrsQNEnnE5rCfkb+c5GCVHHJwMlNIvAFlSP6d4YpyYdOSt4Pu9zMt76xYWu3qX8+8Kg/rZNRNxm05IJnMVzVNzUA2uwAqQ3/anytVU8pz1Wb1LpSPxTaGHHVRW6mgxiyFlUyVcKPZzUZvFn73Q2+SWC87d/StZSvfwdJTR+rq+pd50BVV4ZUHFWlm7x/dqyv9NNLolR7Ys8Zs6aZlxqmcOgfTC+YC/j9lcy4vUAyH+GljCzfmr3uiGZ2dv2/sl5DtTW6cqjk4ddpioE2mNTwy1R7x8eeaAAG2Vt4VlfcXsaYXLC0nefYldSs7BrO6c9kIQ7wxmuve3lTDuDG7sFJNnX8zXro0Ejw1hzPrRnCFSeiJN5uBzyWtj5ZDcSbc42drELQN1LxLyNs594I5orQUzgboqF6Dk0Zb/qLBvopNby1wDpMGE3QRJwuxAjwzepgrnoeGZr+M2rI1wxTU19c0ROXqRrXBzUrxz37Hr7LGPDhyi9Pvb1iVoiYMseYIuXQjrrRcZPSVH5OsXhvbEb1rCgQefm3BeInnyj2xwj1TpqQAGEa4hpH19I419nv/UtLoh0SkZ11Om6JV8onH4nKPagU414uezth04QVvJunBC/vZ5Odvm9frvO7s03F0bVdLCa4PkbaJjYid2bh81GkGvU0Rbwy7lSBO6lKl4oZaFhQ0azDTc9THiA+oxWNpfStkIprdATPnpB/yDs98cpvANkiC7XG3HRKVAANUuVEZmjdz+CiIa3wNjVspL6gtrngpLSdRWFqZG31dMs8Rh7Bqd9RlMHAmaVH5hMr99Xg= X-OriginatorOrg: renesas.com X-MS-Exchange-CrossTenant-Network-Message-Id: 8ae6722a-8a7c-4b68-a1ce-08dcc578dd8c X-MS-Exchange-CrossTenant-AuthSource: TYCPR01MB10914.jpnprd01.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Aug 2024 02:43:28.4222 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 53d82571-da19-47e4-9cb4-625a166a4a2a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: mkuIz7EY4ZyIj551LeQoQ4WU82FUQKydsnkLhfnVKIFBF/T1Vb3YPcqAhx4Ra7PqDhZwWslWM7lWH67BGk2KKhjX60nYN2pZZ/IjcB8/5iS35wMaLymmeBEzVVEL7g7n X-MS-Exchange-Transport-CrossTenantHeadersStamped: TYCPR01MB10616 We already have of_graph_get_next_endpoint(), but it is not intuitive to use in some case. (X) node { (Y) ports { (P0) port@0 { endpoint { remote-endpoint = ...; };}; (P10) port@1 { endpoint { remote-endpoint = ...; }; (P11) endpoint { remote-endpoint = ...; };}; (P2) port@2 { endpoint { remote-endpoint = ...; };}; }; }; For example, if I want to handle port@1's 2 endpoints (= P10, P11), I want to use like below P10 = of_graph_get_next_endpoint(port1, NULL); P11 = of_graph_get_next_endpoint(port1, P10); But 1st one will be error, because of_graph_get_next_endpoint() requested "parent" means "node" (X) or "ports" (Y), not "port". Below works, but it will get P0 /* These will be node/ports/port@0/endpoint */ P0 = of_graph_get_next_endpoint(node, NULL); P0 = of_graph_get_next_endpoint(ports, NULL); In other words, we can't handle P10/P11 directly via of_graph_get_next_endpoint() so far. There is another non intuitive behavior on of_graph_get_next_endpoint(). In case of if I could get P10 pointer for some way, and if I want to handle port@1 things, I would like use it like below /* * "ep" is now P10, and handle port1 things here, * but we don't know how many endpoints port1 has. * * Because "ep" is non NULL now, we can use port1 * as of_graph_get_next_endpoint(port1, xxx) */ do { /* do something for port1 specific things here */ } while (ep = of_graph_get_next_endpoint(port1, ep)) But it also not worked as I expected. I expect it will be P10 -> P11 -> NULL, but it will be P10 -> P11 -> P2, because of_graph_get_next_endpoint() will fetch "endpoint" beyond the "port". It is not useful on generic driver. It uses of_get_next_child() instead for now, but it is not intuitive. And it doesn't check node name (= "endpoint"). To handle endpoint more intuitive, create of_graph_get_next_port_endpoint() of_graph_get_next_port_endpoint(port1, NULL); // P10 of_graph_get_next_port_endpoint(port1, P10); // P11 of_graph_get_next_port_endpoint(port1, P11); // NULL Signed-off-by: Kuninori Morimoto --- drivers/of/property.c | 22 ++++++++++++++++++++++ include/linux/of_graph.h | 20 ++++++++++++++++++++ 2 files changed, 42 insertions(+) diff --git a/drivers/of/property.c b/drivers/of/property.c index aec6ac9f70064..90820e43bc973 100644 --- a/drivers/of/property.c +++ b/drivers/of/property.c @@ -719,6 +719,28 @@ struct device_node *of_graph_get_next_port(struct device_node *parent, } EXPORT_SYMBOL(of_graph_get_next_port); +/** + * of_graph_get_next_port_endpoint() - get next endpoint node in port. + * If it reached to end of the port, it will return NULL. + * @port: pointer to the target port node + * @prev: previous endpoint node, or NULL to get first + * + * Return: An 'endpoint' node pointer with refcount incremented. Refcount + * of the passed @prev node is decremented. + */ +struct device_node *of_graph_get_next_port_endpoint(const struct device_node *port, + struct device_node *prev) +{ + do { + prev = of_get_next_child(port, prev); + if (!prev) + break; + } while (!of_node_name_eq(prev, "endpoint")); + + return prev; +} +EXPORT_SYMBOL(of_graph_get_next_port_endpoint); + /** * of_graph_get_next_endpoint() - get next endpoint node * @parent: pointer to the parent device node diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h index a6b91577700a8..967ee14a1ff37 100644 --- a/include/linux/of_graph.h +++ b/include/linux/of_graph.h @@ -59,6 +59,17 @@ struct of_endpoint { for (child = of_graph_get_next_port(parent, NULL); child != NULL; \ child = of_graph_get_next_port(parent, child)) +/** + * for_each_of_graph_port_endpoint - iterate over every endpoint in a port node + * @parent: parent port node + * @child: loop variable pointing to the current endpoint node + * + * When breaking out of the loop, of_node_put(child) has to be called manually. + */ +#define for_each_of_graph_port_endpoint(parent, child) \ + for (child = of_graph_get_next_port_endpoint(parent, NULL); child != NULL; \ + child = of_graph_get_next_port_endpoint(parent, child)) + #ifdef CONFIG_OF bool of_graph_is_present(const struct device_node *node); int of_graph_parse_endpoint(const struct device_node *node, @@ -72,6 +83,8 @@ struct device_node *of_graph_get_next_ports(struct device_node *parent, struct device_node *ports); struct device_node *of_graph_get_next_port(struct device_node *parent, struct device_node *port); +struct device_node *of_graph_get_next_port_endpoint(const struct device_node *port, + struct device_node *prev); struct device_node *of_graph_get_endpoint_by_regs( const struct device_node *parent, int port_reg, int reg); struct device_node *of_graph_get_remote_endpoint( @@ -132,6 +145,13 @@ static inline struct device_node *of_graph_get_next_port( return NULL; } +static inline struct device_node *of_graph_get_next_port_endpoint( + const struct device_node *parent, + struct device_node *previous) +{ + return NULL; +} + static inline struct device_node *of_graph_get_endpoint_by_regs( const struct device_node *parent, int port_reg, int reg) {