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>

1 files changed, 7 insertions, 0 deletions

diff --git a/device_tree.c b/device_tree.c
index d0378961f0..75412747b7 100644
--- a/device_tree.c
+++ b/device_tree.c
@@ -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;