[PATCH v2 net-next 1/3] dt-bindings: net: tja11xx: use phy-output-refclk to instead of rmii-refclk-in

[Wei Fang <wei.fang@nxp.com>]

Per the RMII specification, the REF_CLK is sourced from MAC to PHY
or from an external source. But for TJA11xx PHYs, they support to
output a 50MHz RMII reference clock on REF_CLK pin. Previously the
"nxp,rmii-refclk-in" was added to indicate that in RMII mode, if
this property present, REF_CLK is input to the PHY, otherwise it
is output. This seems inappropriate now. Because according to the
RMII specification, the REF_CLK is originally input, so there is
no need to add an additional "nxp,rmii-refclk-in" property to
declare that REF_CLK is input. On the contrary, a vendor-defined
property needs to be added if we want the TJA11xx PHYs to provide
the 50MHz RMII reference clock. Therefore, it is more reasonable
to add "nxp,phy-output-refclk" instead of "nxp,rmii-refclk-in".

Signed-off-by: Wei Fang <wei.fang@nxp.com>
---
V2 changes:
1. Changed the property name from "nxp,reverse-mode" to
"nxp,phy-output-refclk".
2. Simplified the description of the property.
3. Modified the subject and commit message.
---
 .../devicetree/bindings/net/nxp,tja11xx.yaml   | 18 +++---------------
 1 file changed, 3 insertions(+), 15 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml b/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml
index 85bfa45f5122..eb813f7bf274 100644
--- a/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml
+++ b/Documentation/devicetree/bindings/net/nxp,tja11xx.yaml
@@ -32,21 +32,9 @@ patternProperties:
         description:
           The ID number for the child PHY. Should be +1 of parent PHY.
 
-      nxp,rmii-refclk-in:
+      nxp,phy-output-refclk:
         type: boolean
-        description: |
-          The REF_CLK is provided for both transmitted and received data
-          in RMII mode. This clock signal is provided by the PHY and is
-          typically derived from an external 25MHz crystal. Alternatively,
-          a 50MHz clock signal generated by an external oscillator can be
-          connected to pin REF_CLK. A third option is to connect a 25MHz
-          clock to pin CLK_IN_OUT. So, the REF_CLK should be configured
-          as input or output according to the actual circuit connection.
-          If present, indicates that the REF_CLK will be configured as
-          interface reference clock input when RMII mode enabled.
-          If not present, the REF_CLK will be configured as interface
-          reference clock output when RMII mode enabled.
-          Only supported on TJA1100 and TJA1101.
+        description: Enable 50MHz RMII reference clock output on REF_CLK pin.
 
     required:
       - reg
@@ -61,7 +49,7 @@ examples:
 
         tja1101_phy0: ethernet-phy@4 {
             reg = <0x4>;
-            nxp,rmii-refclk-in;
+            nxp,phy-output-refclk;
         };
     };
   - |
-- 
2.34.1