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[91.78.208.152]) by smtp.gmail.com with ESMTPSA id e15sm8768909ljb.25.2020.04.18.10.07.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 18 Apr 2020 10:07:17 -0700 (PDT) From: Dmitry Osipenko To: Thierry Reding , Sam Ravnborg , Laurent Pinchart , Rob Herring , Frank Rowand Cc: dri-devel@lists.freedesktop.org, linux-tegra@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 1/6] of_graph: add of_graph_get_local_port() Date: Sat, 18 Apr 2020 20:06:58 +0300 Message-Id: <20200418170703.1583-2-digetx@gmail.com> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200418170703.1583-1-digetx@gmail.com> References: <20200418170703.1583-1-digetx@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In some case, like a DRM display code for example, it's useful to silently check whether port node exists at all in a device-tree before proceeding with parsing the graph. This patch adds of_graph_get_local_port() which returns pointer to a local port node, or NULL if graph isn't specified in a device-tree for a given device node. Signed-off-by: Dmitry Osipenko --- drivers/of/property.c | 32 +++++++++++++++++++++++--------- include/linux/of_graph.h | 7 +++++++ 2 files changed, 30 insertions(+), 9 deletions(-) diff --git a/drivers/of/property.c b/drivers/of/property.c index 252e4f600155..5dbeccaabb86 100644 --- a/drivers/of/property.c +++ b/drivers/of/property.c @@ -608,15 +608,7 @@ struct device_node *of_graph_get_next_endpoint(const struct device_node *parent, * parent port node. */ if (!prev) { - struct device_node *node; - - node = of_get_child_by_name(parent, "ports"); - if (node) - parent = node; - - port = of_get_child_by_name(parent, "port"); - of_node_put(node); - + port = of_graph_get_local_port(parent); if (!port) { pr_err("graph: no port node found in %pOF\n", parent); return NULL; @@ -765,6 +757,28 @@ struct device_node *of_graph_get_remote_port(const struct device_node *node) } EXPORT_SYMBOL(of_graph_get_remote_port); +/** + * of_graph_get_local_port() - get local port node + * @node: pointer to a local endpoint device_node + * + * Return: First local port node associated with local endpoint node linked + * to @node. Use of_node_put() on it when done. + */ +struct device_node *of_graph_get_local_port(const struct device_node *node) +{ + struct device_node *ports, *port; + + ports = of_get_child_by_name(node, "ports"); + if (ports) + node = ports; + + port = of_get_child_by_name(node, "port"); + of_node_put(ports); + + return port; +} +EXPORT_SYMBOL(of_graph_get_local_port); + int of_graph_get_endpoint_count(const struct device_node *np) { struct device_node *endpoint; diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h index 01038a6aade0..1fdeb72c7765 100644 --- a/include/linux/of_graph.h +++ b/include/linux/of_graph.h @@ -54,6 +54,7 @@ struct device_node *of_graph_get_remote_port_parent( struct device_node *of_graph_get_remote_port(const struct device_node *node); struct device_node *of_graph_get_remote_node(const struct device_node *node, u32 port, u32 endpoint); +struct device_node *of_graph_get_local_port(const struct device_node *node); #else static inline int of_graph_parse_endpoint(const struct device_node *node, @@ -116,6 +117,12 @@ static inline struct device_node *of_graph_get_remote_node( return NULL; } +static inline struct device_node *of_graph_get_local_port( + const struct device_node *node) +{ + return NULL; +} + #endif /* CONFIG_OF */ #endif /* __LINUX_OF_GRAPH_H */ -- 2.26.0