[PATCH net-next] dt-bindings: net: ti: k3-am654-cpsw-nuss: Document Serdes PHY

[Siddharth Vadapalli]

Update bindings to include Serdes PHY as an optional PHY, in addition to
the existing CPSW MAC's PHY. The CPSW MAC's PHY is required while the
Serdes PHY is optional. The Serdes PHY handle has to be provided only
when the Serdes is being configured in a Single-Link protocol. Using the
name "serdes-phy" to represent the Serdes PHY handle, the am65-cpsw-nuss
driver can obtain the Serdes PHY and request the Serdes to be
configured.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@xxxxxx>
---

Hello,

This patch corresponds to the Serdes PHY bindings that were missed out in
the series at:
Link: https://lore.kernel.org/r/20230104103432.1126403-1-s-vadapalli@xxxxxx/
This was pointed out at:
https://lore.kernel.org/r/CAMuHMdW5atq-FuLEL3htuE3t2uO86anLL3zeY7n1RqqMP_rH1g@xxxxxxxxxxxxxx/

 .../bindings/net/ti,k3-am654-cpsw-nuss.yaml   | 21 +++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/ti,k3-am654-cpsw-nuss.yaml b/Documentation/devicetree/bindings/net/ti,k3-am654-cpsw-nuss.yaml
index 900063411a20..fab7df437dcc 100644
--- a/Documentation/devicetree/bindings/net/ti,k3-am654-cpsw-nuss.yaml
+++ b/Documentation/devicetree/bindings/net/ti,k3-am654-cpsw-nuss.yaml
@@ -126,8 +126,25 @@ properties:
             description: CPSW port number
 
           phys:
-            maxItems: 1
-            description: phandle on phy-gmii-sel PHY
+            minItems: 1
+            maxItems: 2
+            description:
+              phandle(s) on CPSW MAC's PHY (Required) and the Serdes
+              PHY (Optional). phandle to the Serdes PHY is required
+              when the Serdes has to be configured in Single-Link
+              configuration.
+
+          phy-names:
+            oneOf:
+              - items:
+                  - const: mac-phy
+                  - const: serdes-phy
+              - items:
+                  - const: mac-phy
+            description:
+              Identifiers for the CPSW MAC's PHY and the Serdes PHY.
+              CPSW MAC's PHY is required and therefore "mac-phy" is
+              required, while "serdes-phy" is optional.
 
           label:
             description: label associated with this port
-- 
2.25.1