From patchwork Tue Jun 5 23:52:58 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [07/31] dt: add helper for phandle allocation From: Alexander Graf X-Patchwork-Id: 163219 Message-Id: <1338940402-28502-8-git-send-email-agraf@suse.de> To: "qemu-devel@nongnu.org Developers" Cc: qemu-ppc Mailing List Date: Wed, 6 Jun 2012 01:52:58 +0200 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 --- 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; + + return phandle++; +} + int qemu_devtree_nop_node(void *fdt, const char *node_path) { int r; diff --git a/device_tree.h b/device_tree.h index 5464dc7..f37a4da 100644 --- a/device_tree.h +++ b/device_tree.h @@ -35,6 +35,7 @@ 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 *string); 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);