net: phy: mediatek: Add 2.5Gphy firmware dt-bindings and dts node

Add 2.5Gphy firmware dt-bindings and dts node since mtk-2p5ge
driver requires firmware to run. Also, update MAINTAINERS for
MediaTek's built-in 2.5Gphy dt-bindings and change MAINTAINER's name.

Signed-off-by: Sky Huang <skylake.huang@mediatek.com>

Author: onlyfly34

Documentation/devicetree/bindings/net/mediatek,2p5gphy-fw.yaml

@@ -0,0 +1,37 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/mediatek,2p5gphy-fw.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek Built-in 2.5G Ethernet PHY
+
+maintainers:
+  - Sky Huang <SkyLake.Huang@mediatek.com>
+
+description: |
+  MediaTek Built-in 2.5G Ethernet PHY needs to load firmware so it can
+  run correctly.
+
+properties:
+  compatible:
+    const: "mediatek,2p5gphy-fw"
+
+  reg:
+    items:
+      - description: pmb firmware load address
+      - description: firmware trigger register
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    phyfw: phy-firmware@f000000 {
+      compatible = "mediatek,2p5gphy-fw";
+      reg = <0 0x0f100000 0 0x20000>,
+            <0 0x0f0f0018 0 0x20>;
+    };

MAINTAINERS

@@ -15018,9 +15018,10 @@ F:	include/linux/pcs/pcs-mtk-usxgmii.h
 MEDIATEK ETHERNET PHY DRIVERS
 M:	Daniel Golle <daniel@makrotopia.org>
 M:	Qingfang Deng <dqfext@gmail.com>
-M:	SkyLake Huang <SkyLake.Huang@mediatek.com>
+M:	Sky Huang <SkyLake.Huang@mediatek.com>
 L:	netdev@vger.kernel.org
 S:	Maintained
+F:	Documentation/devicetree/bindings/net/mediatek,2p5gphy-fw.yaml
 F:	drivers/net/phy/mediatek/mtk-ge-soc.c
 F:	drivers/net/phy/mediatek/mtk-phy-lib.c
 F:	drivers/net/phy/mediatek/mtk-ge.c