On Thu, Jun 02, 2016 at 06:27:03PM -0500, Rob Herring wrote:

On Tue, May 31, 2016 at 07:06:36PM +0530, Pramod Kumar wrote:

quoted

This property is used by integrated MDIO multiplexer
which has bus selection and mdio transaction generation logic,
integrated inside.

Signed-off-by: Pramod Kumar <redacted>
---
 Documentation/devicetree/bindings/net/mdio-mux.txt | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/net/mdio-mux.txt b/Documentation/devicetree/bindings/net/mdio-mux.txt
index 491f5bd..b5ad83e 100644
--- a/Documentation/devicetree/bindings/net/mdio-mux.txt
+++ b/Documentation/devicetree/bindings/net/mdio-mux.txt

@@ -5,13 +5,20 @@ numbered uniquely in a device dependent manner.  The nodes for an MDIO
 bus multiplexer/switch will have one child node for each child bus.
 
 Required properties:
-- mdio-parent-bus : phandle to the parent MDIO bus.
 - #address-cells = <1>;
 - #size-cells = <0>;
 
 Optional properties:
+- mdio-parent-bus : phandle to the parent MDIO bus. Should be used
+		if parent mdio bus is not part of multiplexer.

You don't appear to be using this. When would you?

He is moving it to optional. The mdio-mux-mmio and mdio-mux-gpio do
however use it, which follow this binding.

	Andrew