[Xen-devel] [PATCH 3/7] ARM: GICv3: emit optional DT property only when necessary

[Andre Przywara <andre.przywara@xxxxxxxxxx>]

The ARM GICv3 DT property "#redistributor-regions" is optional and only
useful if it has any other values than the architected "1".
Keep our generated DT node clean by emitting this property only if we
actually need more than one region.

Signed-off-by: Andre Przywara <andre.przywara@xxxxxxxxxx>
---
 xen/arch/arm/gic-v3.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
index a0d290b55c..9ad0cd19ef 100644
--- a/xen/arch/arm/gic-v3.c
+++ b/xen/arch/arm/gic-v3.c
@@ -1168,10 +1168,13 @@ static int gicv3_make_hwdom_dt_node(const struct domain 
*d,
     if ( res )
         return res;
 
-    res = fdt_property_cell(fdt, "#redistributor-regions",
-                            d->arch.vgic.nr_regions);
-    if ( res )
-        return res;
+    if ( d->arch.vgic.nr_regions > 1 )
+    {
+        res = fdt_property_cell(fdt, "#redistributor-regions",
+                                d->arch.vgic.nr_regions);
+        if ( res )
+            return res;
+    }
 
     len = dt_cells_to_size(dt_n_addr_cells(gic) + dt_n_size_cells(gic));
     /*
-- 
2.14.1


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