From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from wf-out-1314.google.com (wf-out-1314.google.com [209.85.200.169]) by ozlabs.org (Postfix) with ESMTP id B143FDDF31 for ; Sun, 22 Mar 2009 09:28:28 +1100 (EST) Received: by wf-out-1314.google.com with SMTP id 24so1929047wfg.15 for ; Sat, 21 Mar 2009 15:28:27 -0700 (PDT) Sender: Grant Likely From: Grant Likely Subject: [PATCH v2 02/13] of: add of_parse_phandle() helper for parsing phandle properties To: linuxppc-dev@ozlabs.org, netdev@vger.kernel.org, olof@lixom.net Date: Sat, 21 Mar 2009 16:28:22 -0600 Message-ID: <20090321222821.20493.53188.stgit@localhost.localdomain> In-Reply-To: <20090321222047.20493.87335.stgit@localhost.localdomain> References: <20090321222047.20493.87335.stgit@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Cc: afleming@freescale.com, davem@davemloft.net List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 CC: Michael Ellerman --- drivers/of/base.c | 24 ++++++++++++++++++++++++ include/linux/of.h | 3 +++ 2 files changed, 27 insertions(+), 0 deletions(-) diff --git a/drivers/of/base.c b/drivers/of/base.c index cd17092..104b8c0 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -494,6 +494,30 @@ 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);