From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756650AbaIKPdZ (ORCPT ); Thu, 11 Sep 2014 11:33:25 -0400 Received: from metis.ext.pengutronix.de ([92.198.50.35]:55910 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756233AbaIKPdR (ORCPT ); Thu, 11 Sep 2014 11:33:17 -0400 From: Philipp Zabel To: linux-kernel@vger.kernel.org Cc: linux-media@vger.kernel.org, devel@driverdev.osuosl.org, Grant Likely , Greg Kroah-Hartman , Guennadi Liakhovetski , Laurent Pinchart , Mauro Carvalho Chehab , Russell King , kernel@pengutronix.de, Philipp Zabel Subject: [PATCH v3 5/8] of: Add of_graph_get_port_by_id function Date: Thu, 11 Sep 2014 17:33:04 +0200 Message-Id: <1410449587-1677-6-git-send-email-p.zabel@pengutronix.de> X-Mailer: git-send-email 2.0.1 In-Reply-To: <1410449587-1677-1-git-send-email-p.zabel@pengutronix.de> References: <1410449587-1677-1-git-send-email-p.zabel@pengutronix.de> X-SA-Exim-Connect-IP: 10.1.0.120 X-SA-Exim-Mail-From: p.zabel@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds a function to get a port device tree node by port id, or reg property value. Signed-off-by: Philipp Zabel --- Changes since v2: - Fixed and simplified of_graph_get_port_by_id function --- drivers/of/base.c | 26 ++++++++++++++++++++++++++ include/linux/of_graph.h | 7 +++++++ 2 files changed, 33 insertions(+) diff --git a/drivers/of/base.c b/drivers/of/base.c index a49b5628..76e2651 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -2053,6 +2053,32 @@ int of_graph_parse_endpoint(const struct device_node *node, EXPORT_SYMBOL(of_graph_parse_endpoint); /** + * of_graph_get_port_by_id() - get the port matching a given id + * @parent: pointer to the parent device node + * @id: id of the port + * + * Return: A 'port' node pointer with refcount incremented. The caller + * has to use of_node_put() on it when done. + */ +struct device_node *of_graph_get_port_by_id(struct device_node *node, u32 id) +{ + struct device_node *port; + + for_each_child_of_node(node, port) { + u32 port_id = 0; + + if (of_node_cmp(port->name, "port") != 0) + continue; + of_property_read_u32(port, "reg", &port_id); + if (id == port_id) + return port; + } + + return NULL; +} +EXPORT_SYMBOL(of_graph_get_port_by_id); + +/** * of_graph_get_next_endpoint() - get next endpoint node * @parent: pointer to the parent device node * @prev: previous endpoint node, or NULL to get first diff --git a/include/linux/of_graph.h b/include/linux/of_graph.h index e43442e..3c1c95a 100644 --- a/include/linux/of_graph.h +++ b/include/linux/of_graph.h @@ -40,6 +40,7 @@ struct of_endpoint { #ifdef CONFIG_OF int of_graph_parse_endpoint(const struct device_node *node, struct of_endpoint *endpoint); +struct device_node *of_graph_get_port_by_id(struct device_node *node, u32 id); struct device_node *of_graph_get_next_endpoint(const struct device_node *parent, struct device_node *previous); struct device_node *of_graph_get_remote_port_parent( @@ -53,6 +54,12 @@ static inline int of_graph_parse_endpoint(const struct device_node *node, return -ENOSYS; } +static inline struct device_node *of_graph_get_port_by_id( + struct device_node *node, u32 id) +{ + return NULL; +} + static inline struct device_node *of_graph_get_next_endpoint( const struct device_node *parent, struct device_node *previous) -- 2.1.0