fdt_support: Add fdt_for_each_node_by_compatible() helper macro

Add macro fdt_for_each_node_by_compatible() to allow iterating over
fdt nodes by compatible string.

Convert various usages of
    off = fdt_node_offset_by_compatible(fdt, start, compat);
    while (off > 0) {
        code();
        off = fdt_node_offset_by_compatible(fdt, off, compat);
    }
and similar, to
    fdt_for_each_node_by_compatible(off, fdt, start, compat)
        code();

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/fdt_support.h b/include/fdt_support.h
index 8ec461af6c..852040f66f 100644
--- a/include/fdt_support.h
+++ b/include/fdt_support.h
@@ -289,6 +289,12 @@ int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
 					phys_addr_t compat_off);
 int fdt_node_offset_by_pathf(void *blob, const char *fmt, ...)
 	__attribute__ ((format (printf, 2, 3)));
+
+#define fdt_for_each_node_by_compatible(node, fdt, start, compat)	\
+	for (node = fdt_node_offset_by_compatible(fdt, start, compat);	\
+	     node >= 0;							\
+	     node = fdt_node_offset_by_compatible(fdt, node, compat))
+
 int fdt_set_phandle(void *fdt, int nodeoffset, uint32_t phandle);
 unsigned int fdt_create_phandle(void *fdt, int nodeoffset);
 unsigned int fdt_create_phandle_by_compatible(void *fdt, const char *compat);