From patchwork Sat Apr 25 22:52:40 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Grant Likely X-Patchwork-Id: 26439 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@bilbo.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from ozlabs.org (ozlabs.org [203.10.76.45]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mx.ozlabs.org", Issuer "CA Cert Signing Authority" (verified OK)) by bilbo.ozlabs.org (Postfix) with ESMTPS id BA624B7063 for ; Sun, 26 Apr 2009 08:52:58 +1000 (EST) Received: by ozlabs.org (Postfix) id DEC2CDDF86; Sun, 26 Apr 2009 08:52:55 +1000 (EST) Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by ozlabs.org (Postfix) with ESMTP id E82D1DE0E7 for ; Sun, 26 Apr 2009 08:52:54 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753120AbZDYWwp (ORCPT ); Sat, 25 Apr 2009 18:52:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753079AbZDYWwo (ORCPT ); Sat, 25 Apr 2009 18:52:44 -0400 Received: from wf-out-1314.google.com ([209.85.200.170]:31813 "EHLO wf-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753061AbZDYWwn (ORCPT ); Sat, 25 Apr 2009 18:52:43 -0400 Received: by wf-out-1314.google.com with SMTP id 26so1420116wfd.4 for ; Sat, 25 Apr 2009 15:52:43 -0700 (PDT) Received: by 10.142.192.1 with SMTP id p1mr952623wff.316.1240699963404; Sat, 25 Apr 2009 15:52:43 -0700 (PDT) Received: from trillian.cg.shawcable.net (S01060016b61d1226.cg.shawcable.net [68.146.92.145]) by mx.google.com with ESMTPS id l31sm650706rvb.9.2009.04.25.15.52.41 (version=TLSv1/SSLv3 cipher=RC4-MD5); Sat, 25 Apr 2009 15:52:41 -0700 (PDT) Received: from localhost.localdomain (trillian [127.0.0.1]) by trillian.cg.shawcable.net (Postfix) with ESMTP id 79BEBC8560; Sat, 25 Apr 2009 16:52:40 -0600 (MDT) From: Grant Likely Subject: [PATCH v3 01/13] of: add of_parse_phandle() helper for parsing phandle properties To: linuxppc-dev@ozlabs.org, netdev@vger.kernel.org, Andy Fleming , David Miller , Benjamin Herrenschmidt Cc: Grant Likely , Andy Fleming Date: Sat, 25 Apr 2009 16:52:40 -0600 Message-ID: <20090425225240.32392.62829.stgit@localhost.localdomain> In-Reply-To: <20090425224458.32392.31296.stgit@localhost.localdomain> References: <20090425224458.32392.31296.stgit@localhost.localdomain> User-Agent: StGIT/0.14.2 MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Grant Likely of_parse_phandle() is a helper function to read and parse a phandle property and return a pointer to the resulting device_node. Signed-off-by: Grant Likely Acked-by: Andy Fleming --- drivers/of/base.c | 24 ++++++++++++++++++++++++ include/linux/of.h | 3 +++ 2 files changed, 27 insertions(+), 0 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/of/base.c b/drivers/of/base.c index 41c5dfd..ddf224d 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -495,6 +495,30 @@ int of_modalias_node(struct device_node *node, char *modalias, int len) EXPORT_SYMBOL_GPL(of_modalias_node); /** + * of_parse_phandle - Resolve a phandle property to a device_node pointer + * @np: Pointer to device node holding phandle property + * @phandle_name: Name of property holding a phandle value + * @index: For properties holding a table of phandles, this is the index into + * the table + * + * Returns the device_node pointer with refcount incremented. Use + * of_node_put() on it when done. + */ +struct device_node * +of_parse_phandle(struct device_node *np, const char *phandle_name, int index) +{ + const phandle *phandle; + int size; + + phandle = of_get_property(np, phandle_name, &size); + if ((!phandle) || (size < sizeof(*phandle) * (index + 1))) + return NULL; + + return of_find_node_by_phandle(phandle[index]); +} +EXPORT_SYMBOL(of_parse_phandle); + +/** * of_parse_phandles_with_args - Find a node pointed by phandle in a list * @np: pointer to a device tree node containing a list * @list_name: property name that contains a list diff --git a/include/linux/of.h b/include/linux/of.h index 6a7efa2..7be2d10 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -77,6 +77,9 @@ extern int of_n_size_cells(struct device_node *np); extern const struct of_device_id *of_match_node( const struct of_device_id *matches, const struct device_node *node); extern int of_modalias_node(struct device_node *node, char *modalias, int len); +extern struct device_node *of_parse_phandle(struct device_node *np, + const char *phandle_name, + int index); extern int of_parse_phandles_with_args(struct device_node *np, const char *list_name, const char *cells_name, int index, struct device_node **out_node, const void **out_args);