dt-bindings: net: dsa: dt bindings for microchip lan937x

Documentation in .yaml format and updates to the MAINTAINERS
Also 'make dt_binding_check' is passed.

RGMII internal delay values for the mac is retrieved from
rx-internal-delay-ps & tx-internal-delay-ps as per the feedback from
v3 patch series.
https://lore.kernel.org/netdev/20210802121550.gqgbipqdvp5x76ii@skbuf/

It supports only the delay value of 0ns and 2ns.

Signed-off-by: Prasanna Vengateshan <[e-mail]>
Signed-off-by: Arun Ramadoss <[e-mail]>
Reviewed-by: Rob Herring <[e-mail]>
Reviewed-by: Florian Fainelli <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

Documentation/devicetree/bindings/net/dsa/microchip,lan937x.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/dsa/microchip,lan937x.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: LAN937x Ethernet Switch Series Tree Bindings
+
+maintainers:
+  - [e-mail]
+
+allOf:
+  - $ref: dsa.yaml#
+
+properties:
+  compatible:
+    enum:
+      - microchip,lan9370
+      - microchip,lan9371
+      - microchip,lan9372
+      - microchip,lan9373
+      - microchip,lan9374
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency:
+    maximum: 50000000
+
+  reset-gpios:
+    description: Optional gpio specifier for a reset line
+    maxItems: 1
+
+  mdio:
+    $ref: /schemas/net/mdio.yaml#
+    unevaluatedProperties: false
+
+patternProperties:
+  "^(ethernet-)?ports$":
+    patternProperties:
+      "^(ethernet-)?port@[0-9]+$":
+        allOf:
+          - if:
+              properties:
+                phy-mode:
+                  contains:
+                    enum:
+                      - rgmii
+                      - rgmii-id
+                      - rgmii-txid
+                      - rgmii-rxid
+            then:
+              properties:
+                rx-internal-delay-ps:
+                  enum: [0, 2000]
+                  default: 0
+                tx-internal-delay-ps:
+                  enum: [0, 2000]
+                  default: 0
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    macb0 {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            fixed-link {
+                    speed = <1000>;
+                    full-duplex;
+            };
+    };
+
+    spi {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            lan9374: switch@0 {
+                    compatible = "microchip,lan9374";
+                    reg = <0>;
+                    spi-max-frequency = <44000000>;
+
+                    ethernet-ports {
+                            #address-cells = <1>;
+                            #size-cells = <0>;
+
+                            port@0 {
+                                    reg = <0>;
+                                    label = "lan1";
+                                    phy-mode = "internal";
+                                    phy-handle = <&t1phy0>;
+                            };
+
+                            port@1 {
+                                    reg = <1>;
+                                    label = "lan2";
+                                    phy-mode = "internal";
+                                    phy-handle = <&t1phy1>;
+                            };
+
+                            port@2 {
+                                    reg = <2>;
+                                    label = "lan4";
+                                    phy-mode = "internal";
+                                    phy-handle = <&t1phy2>;
+                            };
+
+                            port@3 {
+                                    reg = <3>;
+                                    label = "lan6";
+                                    phy-mode = "internal";
+                                    phy-handle = <&t1phy3>;
+                            };
+
+                            port@4 {
+                                    reg = <4>;
+                                    phy-mode = "rgmii";
+                                    tx-internal-delay-ps = <2000>;
+                                    rx-internal-delay-ps = <2000>;
+                                    ethernet = <&macb0>;
+
+                                    fixed-link {
+                                            speed = <1000>;
+                                            full-duplex;
+                                    };
+                            };
+
+                            port@5 {
+                                    reg = <5>;
+                                    label = "lan7";
+                                    phy-mode = "rgmii";
+                                    tx-internal-delay-ps = <2000>;
+                                    rx-internal-delay-ps = <2000>;
+
+                                    fixed-link {
+                                            speed = <1000>;
+                                            full-duplex;
+                                    };
+                            };
+
+                            port@6 {
+                                    reg = <6>;
+                                    label = "lan5";
+                                    phy-mode = "internal";
+                                    phy-handle = <&t1phy6>;
+                            };
+
+                            port@7 {
+                                    reg = <7>;
+                                    label = "lan3";
+                                    phy-mode = "internal";
+                                    phy-handle = <&t1phy7>;
+                            };
+                    };
+
+                    mdio {
+                            #address-cells = <1>;
+                            #size-cells = <0>;
+
+                            t1phy0: ethernet-phy@0{
+                                    reg = <0x0>;
+                            };
+
+                            t1phy1: ethernet-phy@1{
+                                    reg = <0x1>;
+                            };
+
+                            t1phy2: ethernet-phy@2{
+                                    reg = <0x2>;
+                            };
+
+                            t1phy3: ethernet-phy@3{
+                                    reg = <0x3>;
+                            };
+
+                            t1phy6: ethernet-phy@6{
+                                    reg = <0x6>;
+                            };
+
+                            t1phy7: ethernet-phy@7{
+                                    reg = <0x7>;
+                            };
+                    };
+            };
+    };

MAINTAINERS

···
 L:	[e-mail]
 S:	Maintained
 F:	Documentation/devicetree/bindings/net/dsa/microchip,ksz.yaml
+F:	Documentation/devicetree/bindings/net/dsa/microchip,lan937x.yaml
 F:	drivers/net/dsa/microchip/*
 F:	include/linux/platform_data/microchip-ksz.h
 F:	net/dsa/tag_ksz.c