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dt: add helper for phandle allocation 

Phandle references work by having 2 pieces:

  - a "phandle" 1-cell property in the device tree node
  - a reference to the same value in a property we want to point
    to the other node

To generate the 1-cell property, we need an allocation mechanism that
gives us a unique number space. This patch adds an allocator for these
properties.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2012-05-17 16:58:55 +02:00
parent ce36252cc1
commit 3601b57282
2 changed files with 8 additions and 0 deletions
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7
device_tree.c
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@ -191,6 +191,13 @@ int qemu_devtree_setprop_phandle(void *fdt, const char *node_path,
return qemu_devtree_setprop_cell(fdt, node_path, property, phandle);
}
uint32_t qemu_devtree_alloc_phandle(void *fdt)
{
static int phandle = 0x8000;
return phandle++;
}
int qemu_devtree_nop_node(void *fdt, const char *node_path)
{
int r;

1
device_tree.h
View File

@ -27,6 +27,7 @@ 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);
uint32_t qemu_devtree_alloc_phandle(void *fdt);
int qemu_devtree_nop_node(void *fdt, const char *node_path);
int qemu_devtree_add_subnode(void *fdt, const char *name);