From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f52.google.com (mail-pj1-f52.google.com [209.85.216.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4DCF73DAAAC for ; Fri, 24 Jul 2026 08:44:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.52 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784882656; cv=none; b=aJnXhspF/n0vr3dOzLNz/l9guSofO12HhsSu3S3jLAnwnKGK5qC49uje03S+IisQknB3d/xg2n83G++yX6X3+kQaimrrdWApvlaqx+XrRfKEbXUXz10sa40AG4ZnfyuDxH3ofynNpgT9PPCnEG1Sy9DGl3PCR/apBAY7Pv+4WnA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784882656; c=relaxed/simple; bh=K/CXr8sGOQIlsbuegDLGNruY8OXemH3+DJMD2gXrC6w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Mkn9NtPT4BBL83rRAbIbUau8yLBQCwYjrPFCjo1N0MzduTeZAE22PW7UsJoNYv7IzTfASep2AUxMZigLk7oSK3I7+KQWNNosztSgPLNJJvJexlbV9GQ6YvZFZAu2XC4aarAKn8beodQhbFnJ1dcXsq+/QjBC8Ng7XS4/M4wEoXQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=Xic4eBlT; arc=none smtp.client-ip=209.85.216.52 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="Xic4eBlT" Received: by mail-pj1-f52.google.com with SMTP id 98e67ed59e1d1-385ea3ce80dso152661a91.2 for ; Fri, 24 Jul 2026 01:44:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1784882653; x=1785487453; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=15QCCMJqDJvxC4OlYXPloXq3cJq1LSRVcuMMIDjVYjA=; b=Xic4eBlT78W9I04d2CEONJApzA+CYXES3lepeP+ZemSqti47+9bORS/wJVBIutncD9 shFhpqdmTpSxbycJeuzPOoeZGONL2/yQ1OSDHusiQ4vE8CqOCrVEShWTbECN9PVs/tjW yYkQAWsDBEhEKHP5B9XEqRlxQddDxY3yI8iuA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1784882653; x=1785487453; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=15QCCMJqDJvxC4OlYXPloXq3cJq1LSRVcuMMIDjVYjA=; b=mEPdjAlaL76ISmpg+eprhShpvSk8KME+MX0jc0gYbKoMMiPh/AENTYytxq5kNaDBpT nD9mVd0+/Hk36eK7EiCMfOBSS0kLiM1b3ZbTS0Afo70uloXeanHPoT5lmklIG/d72eDp oiBdIyejNKyGt9rBvDdxTqByY9rEZnS4bEV0EWFVcOptvuHxmwc+Ux3V7sXA8NLW0MFU KFBAwGrxX3tsunhoWea2OPOzBUzkd4K424mSeq3N+6aYL1cpXlo79lLb3K9NfO2E67o+ U+MkDLLaDsgtvfS/1bywa2K+aEyPcNkMUw6wYFZSWGcdPXSi+q+9CNGdx5g1dgu7TaAD RkOg== X-Forwarded-Encrypted: i=1; AHgh+RraGFLioXSPL3OFsc3NB15odlnxQJmT5TSaRUglfrHYDM/0dGUB5JGrVfxYfiU2D7oiQvUT1DE9BvpXWww=@vger.kernel.org X-Gm-Message-State: AOJu0YysiLCT6oBB7f0i3ECBsCbAUF7EDQ6EKJUMT5KzpXtY6Gd9Snkm o6YoX8z9srGqI709ws4fxpShlX+pF7uj9Xpiw7YgJ2s9xmmeswRO+XHjomSdviCUKw== X-Gm-Gg: AR+sD113q93lVSdZCIoWob/WpLv60/lqoEq5DwQveT68r1BfBWT5Rx5387WptA77yzw xY6MpPeltCCIPVCL2PaB/JZm3NpRiLFBVX+ZhHfcQH3YGuv4P6P6Clb7/pMaIWUmzrDjDPTzqNV ROsE/DC3ocE2a6/We+LFCI5PDwelz62Dgzx9cBn/uSB9ZYOAZ4vVzovmdu59qNAZWsSMeVcBvK7 eKGl0c1i6uHah+FKEW6KEsvWhS7Q+qC/vVtYnigCQiH0uVgJtbdUfMygkL5zHJwIo+sZTHuNcG0 SyWJ9LWv7ke+KBxnR/V7+fbV5uKitbDGjI/cplqDCsJ2DXwEjQVzVmiXTSaH0BtZMB7xXFL9HqG GgVBlDbZIiHe/1XEQ8JBFe7X56vpisJCV8RCn3x0l+OphOwc6PQp7SgGP8lZRLCZNRDjY9A2Pgz EL39bWzpIgH1Tx4Dmpne95LQBZs6yvwA1NeVD773UhL+fiWny0uUqVCg6HsrI= X-Received: by 2002:a17:90b:56cf:b0:369:a359:b181 with SMTP id 98e67ed59e1d1-38ec6610d34mr6642066a91.23.1784882653597; Fri, 24 Jul 2026 01:44:13 -0700 (PDT) Received: from wenstp920.tpe.corp.google.com ([2a00:79e0:201d:8:f131:86cc:5858:7325]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-38f089ac6d8sm434546a91.2.2026.07.24.01.44.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 Jul 2026 01:44:12 -0700 (PDT) From: Chen-Yu Tsai To: Bartosz Golaszewski , Greg Kroah-Hartman , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , "Rafael J. Wysocki" , Danilo Krummrich , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno Cc: Wei Deng , Chen-Yu Tsai , linux-acpi@vger.kernel.org, driver-core@lists.linux.dev, linux-pm@vger.kernel.org, linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Manivannan Sadhasivam , Alan Stern , Bartosz Golaszewski Subject: [PATCH v7 02/16] device property: Add fwnode_graph_get_next_port_endpoint() Date: Fri, 24 Jul 2026 16:43:11 +0800 Message-ID: <20260724084328.3943997-3-wenst@chromium.org> X-Mailer: git-send-email 2.55.0.229.g6434b31f56-goog In-Reply-To: <20260724084328.3943997-1-wenst@chromium.org> References: <20260724084328.3943997-1-wenst@chromium.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Due to design constraints of the power sequencing API, the consumer must first be sure that the other side is actually a provider, or it will continually get -EPROBE_DEFER when requesting the power sequencing descriptor. In the upcoming USB power sequencing integration, the USB hub driver first needs to check whether a graph connection exists, and whether the other side of the connection is a supported connector type. The USB port is tied to a "port" firmware node, and this new helper will be used to get the endpoint under the known "port" firmware node. Sashiko points out that the |prev| reference put is not done if |port| is NULL. However it seems that the fwnode_*() and of_*() API design implicitly makes the functions no-ops if the passed in node is NULL. So this new addition follows the same pattern. Cc: Sakari Ailus Reviewed-by: Andy Shevchenko Reviewed-by: Bartosz Golaszewski Signed-off-by: Chen-Yu Tsai --- Changes since v2: - Dropped unused |ep| variable - Rewrote as do {} while() - Dropped WARN() use --- drivers/base/property.c | 25 +++++++++++++++++++++++++ include/linux/property.h | 2 ++ 2 files changed, 27 insertions(+) diff --git a/drivers/base/property.c b/drivers/base/property.c index 950defc0c55a..5d3993bd8fc4 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -1099,6 +1099,31 @@ int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name) } EXPORT_SYMBOL(fwnode_irq_get_byname); +/** + * fwnode_graph_get_next_port_endpoint - Get next endpoint firmware node in port + * @port: Pointer to the target port firmware node + * @prev: Previous endpoint node or %NULL to get the first + * + * The caller is responsible for calling fwnode_handle_put() on the returned + * fwnode pointer. Note that this function also puts a reference to @prev + * unconditionally. + * + * Return: an endpoint firmware node pointer or %NULL if no more endpoints + * are available. + */ +struct fwnode_handle *fwnode_graph_get_next_port_endpoint(const struct fwnode_handle *port, + struct fwnode_handle *prev) +{ + do { + prev = fwnode_get_next_child_node(port, prev); + if (fwnode_name_eq(prev, "endpoint")) + break; + } while (prev); + + return prev; +} +EXPORT_SYMBOL_GPL(fwnode_graph_get_next_port_endpoint); + /** * fwnode_graph_get_next_endpoint - Get next endpoint firmware node * @fwnode: Pointer to the parent firmware node diff --git a/include/linux/property.h b/include/linux/property.h index 01ea010cb2f9..9a784a856773 100644 --- a/include/linux/property.h +++ b/include/linux/property.h @@ -507,6 +507,8 @@ void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index); struct fwnode_handle *fwnode_graph_get_port_by_id(struct fwnode_handle *fwnode, u32 id, unsigned long flags); +struct fwnode_handle *fwnode_graph_get_next_port_endpoint( + const struct fwnode_handle *port, struct fwnode_handle *prev); struct fwnode_handle *fwnode_graph_get_next_endpoint( const struct fwnode_handle *fwnode, struct fwnode_handle *prev); struct fwnode_handle * -- 2.55.0.229.g6434b31f56-goog