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, 4 deletions

diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index fbcde6f9c7..2be5515053 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -332,7 +332,6 @@ void __init start_xen(unsigned long boot_phys_offset,
                       unsigned long fdt_paddr,
                       unsigned long cpuid)
 {
-    void *fdt;
     size_t fdt_size;
     int cpus, i;
 
@@ -340,12 +339,12 @@ void __init start_xen(unsigned long boot_phys_offset,
 
     smp_clear_cpu_maps();
 
-    fdt = (void *)BOOT_MISC_VIRT_START
+    device_tree_flattened = (void *)BOOT_MISC_VIRT_START
         + (fdt_paddr & ((1 << SECOND_SHIFT) - 1));
-    fdt_size = device_tree_early_init(fdt);
+    fdt_size = device_tree_early_init(device_tree_flattened);
 
     cpus = smp_get_max_cpus();
-    cmdline_parse(device_tree_bootargs(fdt));
+    cmdline_parse(device_tree_bootargs(device_tree_flattened));
 
     setup_pagetables(boot_phys_offset, get_xen_paddr());
     setup_mm(fdt_paddr, fdt_size);