From mboxrd@z Thu Jan 1 00:00:00 1970 From: Maxime Ripard Subject: [PATCH v2 5/9] libfdt: Add iterator over properties Date: Fri, 27 May 2016 11:13:18 +0200 Message-ID: <1464340402-2249-6-git-send-email-maxime.ripard@free-electrons.com> References: <1464340402-2249-1-git-send-email-maxime.ripard@free-electrons.com> Return-path: In-Reply-To: <1464340402-2249-1-git-send-email-maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org> Sender: devicetree-compiler-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Pantelis Antoniou , Simon Glass Cc: Boris Brezillon , Alexander Kaplan , Thomas Petazzoni , devicetree-compiler-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, =?UTF-8?q?Antoine=20T=C3=A9nart?= , Hans de Goede , Tom Rini , u-boot-0aAXYlwwYIKGBzrmiIFOJg@public.gmane.org, Stefan Agner , Maxime Ripard Implement a macro based on fdt_first_property_offset and fdt_next_property_offset that provides a convenience to iterate over all the properties of a given node. Signed-off-by: Maxime Ripard --- include/libfdt.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/include/libfdt.h b/include/libfdt.h index 74b1d149c2dd..4e8eb9ede3a4 100644 --- a/include/libfdt.h +++ b/include/libfdt.h @@ -441,6 +441,30 @@ int fdt_first_property_offset(const void *fdt, int nodeoffset); int fdt_next_property_offset(const void *fdt, int offset); /** + * fdt_for_each_property - iterate over all properties of a node + * @fdt: FDT blob (const void *) + * @node: node offset (int) + * @property: property offset (int) + * + * This is actually a wrapper around a for loop and would be used like so: + * + * fdt_for_each_property(fdt, node, property) { + * ... + * use property + * ... + * } + * + * Note that this is implemented as a macro and property is used as + * iterator in the loop. It should therefore be a locally allocated + * variable. The node variable on the other hand is never modified, so + * it can be constant or even a literal. + */ +#define fdt_for_each_property(fdt, node, property) \ + for (property = fdt_first_property_offset(fdt, node); \ + property >= 0; \ + property = fdt_next_property_offset(fdt, property)) + +/** * fdt_get_property_by_offset - retrieve the property at a given offset * @fdt: pointer to the device tree blob * @offset: offset of the property to retrieve -- 2.8.2