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dt: add helper for phandle enumeration

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This patch adds a helper to search for a node's phandle by its path. This
is especially useful when the phandle is part of an array, not just a single
cell in which case qemu_devtree_setprop_phandle would be the easy choice.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@petalogix.com>
This commit is contained in:
Alexander Graf 2012-05-17 15:23:39 +02:00
parent ef5d833fc6
commit 7d5fd1089c
2 changed files with 16 additions and 1 deletions
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16
device_tree.c
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@ -132,11 +132,25 @@ int qemu_devtree_setprop_string(void *fdt, const char *node_path,
return r;
}
uint32_t qemu_devtree_get_phandle(void *fdt, const char *path)
{
uint32_t r;
r = fdt_get_phandle(fdt, findnode_nofail(fdt, path));
if (r <= 0) {
fprintf(stderr, "%s: Couldn't get phandle for %s: %s\n", __func__,
path, fdt_strerror(r));
exit(1);
}
return r;
}
int qemu_devtree_setprop_phandle(void *fdt, const char *node_path,
const char *property,
const char *target_node_path)
{
uint32_t phandle = fdt_get_phandle(fdt, findnode_nofail(fdt, target_node_path));
uint32_t phandle = qemu_devtree_get_phandle(fdt, target_node_path);
return qemu_devtree_setprop_cell(fdt, node_path, property, phandle);
}

1
device_tree.h
View File

@ -25,6 +25,7 @@ int qemu_devtree_setprop_string(void *fdt, const char *node_path,
int qemu_devtree_setprop_phandle(void *fdt, const char *node_path,
const char *property,
const char *target_node_path);
uint32_t qemu_devtree_get_phandle(void *fdt, const char *path);
int qemu_devtree_nop_node(void *fdt, const char *node_path);
int qemu_devtree_add_subnode(void *fdt, const char *name);