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dt: add helper for phandle references

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Phandles are the fancy device tree name for "pointer to another node".
To create a phandle property, we most likely want to reference to the
node we're pointing to by its path. So create a helper that allows
us to do so.

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 14:11:52 +02:00
parent 7ae2291e8e
commit 8535ab1258
2 changed files with 11 additions and 0 deletions
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8
device_tree.c
View File

@ -132,6 +132,14 @@ int qemu_devtree_setprop_string(void *fdt, const char *node_path,
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));
return qemu_devtree_setprop_cell(fdt, node_path, property, phandle);
}
int qemu_devtree_nop_node(void *fdt, const char *node_path)
{
int r;

3
device_tree.h
View File

@ -22,6 +22,9 @@ int qemu_devtree_setprop_cell(void *fdt, const char *node_path,
const char *property, uint32_t val);
int qemu_devtree_setprop_string(void *fdt, const char *node_path,
const char *property, const char *string);
int qemu_devtree_setprop_phandle(void *fdt, const char *node_path,
const char *property,
const char *target_node_path);
int qemu_devtree_nop_node(void *fdt, const char *node_path);
int qemu_devtree_add_subnode(void *fdt, const char *name);