The Stream Buffer for EtherAVB-IF (STBE) is an optional component, and
is not present on all SoCs.

Document this in the DT bindings, including a list of SoCs that do have

Fixes: 785ec87483d1e24a ("ravb: document R8A77970 bindings")
Fixes: f231c4178a655b09 ("dt-bindings: net: renesas-ravb: Add support for 
R8A77995 RAVB")
Signed-off-by: Geert Uytterhoeven <>
Reviewed-by: Simon Horman <>
Acked-by: Sergei Shtylyov <>
Reviewed-by: Rob Herring <>
  - Add Reviewed-by, Acked-by,
  - Add R-Car M3-N.
 Documentation/devicetree/bindings/net/renesas,ravb.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/net/renesas,ravb.txt 
index bf071a58f2926ad3..2b5cb655b0e93bfd 100644
--- a/Documentation/devicetree/bindings/net/renesas,ravb.txt
+++ b/Documentation/devicetree/bindings/net/renesas,ravb.txt
@@ -27,7 +27,11 @@ Required properties:
        SoC-specific version corresponding to the platform first followed by
        the generic version.
-- reg: offset and length of (1) the register block and (2) the stream buffer.
+- reg: Offset and length of (1) the register block and (2) the stream buffer.
+       The region for the register block is mandatory.
+       The region for the stream buffer is optional, as it is only present on
+       R-Car Gen2 and RZ/G1 SoCs, and on R-Car H3 (R8A7795), M3-W (R8A7796),
+       and M3-N (R8A77965).
 - interrupts: A list of interrupt-specifiers, one for each entry in
              If interrupt-names is not present, an interrupt specifier

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