[PATCH net-next v6 10/12] dt-bindings: net: dsa: lantiq,gswip: add support for MaxLinear GSW1xx switches

[Daniel Golle <daniel@makrotopia.org>]

Extend the Lantiq GSWIP device tree binding to also cover MaxLinear
GSW1xx switches which are based on the same hardware IP but connected
via MDIO instead of being memory-mapped.

Add compatible strings for MaxLinear GSW120, GSW125, GSW140, GSW141,
and GSW145 switches and adjust the schema to handle the different
connection methods with conditional properties.

Add MaxLinear GSW125 example showing MDIO-connected configuration.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
v6:
 * keep properties on top level and use allOf for conditional constraints

v5:
 * drop maxlinear,rx-inverted from example

v4:
 * drop maxlinear,rx-inverted and maxlinear,tx-inverted properties for
   now in favor of upcoming generic properties

v3:
 * add maxlinear,rx-inverted and maxlinear,tx-inverted properties

v2:
 * remove git conflict left-overs which somehow creeped in
 * indent example with 4 spaces instead of tabs

 .../bindings/net/dsa/lantiq,gswip.yaml        | 131 +++++++++++++++++-
 1 file changed, 126 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
index cf01b07f7f44..8904d0b6cec5 100644
--- a/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
+++ b/Documentation/devicetree/bindings/net/dsa/lantiq,gswip.yaml
@@ -4,7 +4,12 @@
 $id: http://devicetree.org/schemas/net/dsa/lantiq,gswip.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: Lantiq GSWIP Ethernet switches
+title: Lantiq GSWIP and MaxLinear GSW1xx Ethernet switches
+
+description:
+  Lantiq GSWIP and MaxLinear GSW1xx switches share the same hardware IP.
+  Lantiq switches are embedded in SoCs and accessed via memory-mapped I/O,
+  while MaxLinear switches are standalone ICs connected via MDIO.
 
 $ref: dsa.yaml#
 
@@ -46,9 +51,14 @@ properties:
       - lantiq,xrx200-gswip
       - lantiq,xrx300-gswip
       - lantiq,xrx330-gswip
+      - maxlinear,gsw120
+      - maxlinear,gsw125
+      - maxlinear,gsw140
+      - maxlinear,gsw141
+      - maxlinear,gsw145
 
   reg:
-    minItems: 3
+    minItems: 1
     maxItems: 3
 
   reg-names:
@@ -65,9 +75,6 @@ properties:
       compatible:
         const: lantiq,xrx200-mdio
 
-    required:
-      - compatible
-
   gphy-fw:
     type: object
     properties:
@@ -123,6 +130,32 @@ required:
   - compatible
   - reg
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - lantiq,xrx200-gswip
+              - lantiq,xrx300-gswip
+              - lantiq,xrx330-gswip
+    then:
+      properties:
+        reg:
+          minItems: 3
+          maxItems: 3
+        mdio:
+          required:
+            - compatible
+      required:
+        - reg-names
+    else:
+      properties:
+        reg:
+          maxItems: 1
+        reg-names: false
+        gphy-fw: false
+
 unevaluatedProperties: false
 
 examples:
@@ -132,6 +165,7 @@ examples:
             reg = <0xe108000 0x3100>,  /* switch */
                   <0xe10b100 0xd8>,    /* mdio */
                   <0xe10b1d8 0x130>;   /* mii */
+            reg-names = "switch", "mdio", "mii";
             dsa,member = <0 0>;
 
             ports {
@@ -230,3 +264,90 @@ examples:
                     };
             };
     };
+
+  - |
+    #include <dt-bindings/leds/common.h>
+
+    mdio {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        switch@1f {
+            compatible = "maxlinear,gsw125";
+            reg = <0x1f>;
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                port@0 {
+                    reg = <0>;
+                    label = "lan0";
+                    phy-handle = <&switchphy0>;
+                    phy-mode = "internal";
+                };
+
+                port@1 {
+                    reg = <1>;
+                    label = "lan1";
+                    phy-handle = <&switchphy1>;
+                    phy-mode = "internal";
+                };
+
+                port@4 {
+                    reg = <4>;
+                    label = "wan";
+                    phy-mode = "1000base-x";
+                    managed = "in-band-status";
+                };
+
+                port@5 {
+                    reg = <5>;
+                    phy-mode = "rgmii-id";
+                    tx-internal-delay-ps = <2000>;
+                    rx-internal-delay-ps = <2000>;
+                    ethernet = <&eth0>;
+
+                    fixed-link {
+                        speed = <1000>;
+                        full-duplex;
+                    };
+                };
+            };
+
+            mdio {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                switchphy0: switchphy@0 {
+                    reg = <0>;
+
+                    leds {
+                        #address-cells = <1>;
+                        #size-cells = <0>;
+
+                        led@0 {
+                            reg = <0>;
+                            color = <LED_COLOR_ID_GREEN>;
+                            function = LED_FUNCTION_LAN;
+                        };
+                    };
+                };
+
+                switchphy1: switchphy@1 {
+                    reg = <1>;
+
+                    leds {
+                        #address-cells = <1>;
+                        #size-cells = <0>;
+
+                        led@0 {
+                            reg = <0>;
+                            color = <LED_COLOR_ID_GREEN>;
+                            function = LED_FUNCTION_LAN;
+                        };
+                    };
+                };
+            };
+        };
+    };
-- 
2.51.2