From mboxrd@z Thu Jan 1 00:00:00 1970 From: Simon Glass Subject: [PATCH v2 01/20] fdt: Add function to locate an array in the device tree Date: Fri, 13 Jan 2012 13:35:16 -0800 Message-ID: <1326490535-3461-2-git-send-email-sjg@chromium.org> References: <1326490535-3461-1-git-send-email-sjg@chromium.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1326490535-3461-1-git-send-email-sjg-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: devicetree-discuss-bounces+gldd-devicetree-discuss=m.gmane.org-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org Sender: devicetree-discuss-bounces+gldd-devicetree-discuss=m.gmane.org-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org To: U-Boot Mailing List Cc: Devicetree Discuss , Tom Warren , Jerry Van Baren List-Id: devicetree@vger.kernel.org fdtdec_locate_array() locates an integer array but does not copy it. This saves the caller having to allocated wasted space. Access to array elements should be through the fdt32_to_cpu() macro. Signed-off-by: Simon Glass --- Changes in v2: - Add new fdtdec_locate_array() function include/fdtdec.h | 19 +++++++++++++++++++ lib/fdtdec.c | 11 +++++++++++ 2 files changed, 30 insertions(+), 0 deletions(-) diff --git a/include/fdtdec.h b/include/fdtdec.h index 82264d4..42744f9 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -251,6 +251,25 @@ int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, u32 *array, int count); /** + * Look up a property in a node and return a pointer to its contents as a + * unsigned int array of given length. The property must have at least enough + * data for the array ('count' cells). It may have more, but this will be + * ignored. The data is not copied. + * + * Note that you must access elements of the array with fdt32_to_cpu(), + * since the elements will be big endian even on a little endian machine. + * + * @param blob FDT blob + * @param node node to examine + * @param prop_name name of property to find + * @param count number of array elements + * @return pointer to array if found, or NULL if the property is not + * found or there is not enough data + */ +const u32 *fdtdec_locate_array(const void *blob, int node, + const char *prop_name, int count); + +/** * Look up a boolean property in a node and return it. * * A boolean properly is true if present in the device tree and false if not diff --git a/lib/fdtdec.c b/lib/fdtdec.c index 3330edf..f1af878 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -341,6 +341,17 @@ int fdtdec_get_int_array(const void *blob, int node, const char *prop_name, return err; } +const u32 *fdtdec_locate_array(const void *blob, int node, + const char *prop_name, int count) +{ + const u32 *cell; + int err; + + cell = get_prop_check_min_len(blob, node, prop_name, + sizeof(u32) * count, &err); + return err ? NULL : cell; +} + int fdtdec_get_bool(const void *blob, int node, const char *prop_name) { const s32 *cell; -- 1.7.7.3