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Wysocki" , Danilo Krummrich , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno Cc: Alan Stern , 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 Subject: [PATCH v2 02/16] device property: Add fwnode_graph_get_next_port_endpoint() Date: Wed, 10 Jun 2026 16:40:36 +0800 Message-ID: <20260610084053.2059858-3-wenst@chromium.org> X-Mailer: git-send-email 2.54.0.1099.g489fc7bff1-goog In-Reply-To: <20260610084053.2059858-1-wenst@chromium.org> References: <20260610084053.2059858-1-wenst@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260610_014128_812951_160261B1 X-CRM114-Status: GOOD ( 18.53 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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. Signed-off-by: Chen-Yu Tsai --- drivers/base/property.c | 33 +++++++++++++++++++++++++++++++++ include/linux/property.h | 2 ++ 2 files changed, 35 insertions(+) diff --git a/drivers/base/property.c b/drivers/base/property.c index a2afd854a604..cf14f9b0a3e0 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -1099,6 +1099,39 @@ 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) +{ + struct fwnode_handle *ep; + + while (1) { + prev = fwnode_get_next_child_node(port, prev); + if (!prev) + break; + + if (WARN(!fwnode_name_eq(prev, "endpoint"), + "non endpoint node is used (%pfw)", prev)) + continue; + + break; + } + + 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 11f3b54c7de0..2e744c6f251d 100644 --- a/include/linux/property.h +++ b/include/linux/property.h @@ -500,6 +500,8 @@ int fwnode_get_phy_mode(const struct fwnode_handle *fwnode); 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); +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 * -- 2.54.0.1099.g489fc7bff1-goog