of: Support matching cpu nodes with no 'reg' property

For some single core ARM systems, the DTs can have a single cpu node
without a reg property and #address-cells == 0. This case is valid and
should match on cpu #0.

Cc: Frank Rowand <frowand.list@gmail.com>
Signed-off-by: Rob Herring <robh@kernel.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 4807db0a35b3..bd51d2113cc0 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -327,6 +327,8 @@ static bool __of_find_n_match_cpu_property(struct device_node *cpun,
 
         ac = of_n_addr_cells(cpun);
         cell = of_get_property(cpun, prop_name, &prop_len);
+        if (!cell && !ac && arch_match_cpu_phys_id(cpu, 0))
+                return true;
         if (!cell || !ac)
                 return false;
         prop_len /= sizeof(*cell) * ac;