xen/device_tree: introduce find_compatible_node

Introduce a find_compatible_node function that can be used by device
drivers to find the node corresponding to their device in the device
tree.

Initialize device_tree_flattened early in start_xen, so that it is
available before setup_mm. Get rid of fdt in the process.

Also add device_tree_node_compatible to device_tree.h, that is currently
missing.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
[ ijc - s/atag_paddr/fdt_paddr ]
Committed-by: Ian Campbell <ian.campbell@citrix.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
index 52ef258584..1d04e4f011 100644
--- a/xen/include/xen/device_tree.h
+++ b/xen/include/xen/device_tree.h
@@ -68,6 +68,9 @@ void device_tree_set_reg(u32 **cell, u32 address_cells, u32 size_cells,
                          u64 start, u64 size);
 u32 device_tree_get_u32(const void *fdt, int node, const char *prop_name);
 bool_t device_tree_node_matches(const void *fdt, int node, const char *match);
+bool_t device_tree_node_compatible(const void *fdt, int node, const char *match);
+int find_compatible_node(const char *compatible, int *node, int *depth,
+                u32 *address_cells, u32 *size_cells);
 int device_tree_for_each_node(const void *fdt,
                               device_tree_node_func func, void *data);
 const char *device_tree_bootargs(const void *fdt);