On 06/06/2012 07:18 AM, Peter Crosthwaite wrote:
On Wed, 2012-06-06 at 01:52 +0200, Alexander Graf wrote:
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<ag...@suse.de>
---
device_tree.c | 7 +++++++
device_tree.h | 1 +
2 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/device_tree.c b/device_tree.c
index d4f1f0a..317bdd0 100644
--- a/device_tree.c
+++ b/device_tree.c
@@ -220,6 +220,13 @@ 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;
can easily double check for duplicates. Would also allow you to start
from 1 rather than magic number 0x8000?
while (fdt_node_offset_by_phandle(fdt, phandle) != FDT_ERR_NOTFOUND)
phandle++;
That's a nice one. It'd even allow us to drop the external phandle
starting id patch.
Scott, would this work for you?
Alex
