[PATCH] xen/arm: bootfdt: Use proper default for #address-cells and #size-cells

[Julien Grall <julien.grall@linaro.org>]

Per the device-tree specific [1], when the property #address-cells
and  #size-cells are not present, the default value should be resp. 1
and 2.

[1] https://www.devicetree.org/downloads/devicetree-specification-v0.1-20160524.pdf

Signed-off-by: Julien Grall <julien.grall@linaro.org>

---

    This was discovered debugging DT generated by GRUB on ACPI-only
    platform. I am not aware of any DT relying on that for now, but it
    would still be nice to be compliant with the spec and avoid
    surprise.
---
 xen/arch/arm/bootfdt.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/bootfdt.c b/xen/arch/arm/bootfdt.c
index 4a687e725d..8eba42c7b9 100644
--- a/xen/arch/arm/bootfdt.c
+++ b/xen/arch/arm/bootfdt.c
@@ -109,8 +109,8 @@ int __init device_tree_for_each_node(const void *fdt,
             continue;
         }
 
-        as = depth > 0 ? address_cells[depth-1] : 0;
-        ss = depth > 0 ? size_cells[depth-1] : 0;
+        as = depth > 0 ? address_cells[depth-1] : DT_ROOT_NODE_ADDR_CELLS_DEFAULT;
+        ss = depth > 0 ? size_cells[depth-1] : DT_ROOT_NODE_SIZE_CELLS_DEFAULT;
 
         address_cells[depth] = device_tree_get_u32(fdt, node,
                                                    "#address-cells", as);
-- 
2.11.0


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