dt-bindings: net: dp83822: Add TI dp83822 phy

Add a dt binding for the TI dp83822 ethernet phy device.
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/ti,dp83822.yaml

+# SPDX-License-Identifier: (GPL-2.0+ OR BSD-2-Clause)
+# Copyright (C) 2020 Texas Instruments Incorporated
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/net/ti,dp83822.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: TI DP83822 ethernet PHY
+
+maintainers:
+  - Dan Murphy <dmurphy@ti.com>
+
+description: |
+  The DP83822 is a low-power, single-port, 10/100 Mbps Ethernet PHY. It
+  provides all of the physical layer functions needed to transmit and receive
+  data over standard, twisted-pair cables or to connect to an external,
+  fiber-optic transceiver. Additionally, the DP83822 provides flexibility to
+  connect to a MAC through a standard MII, RMII, or RGMII interface
+
+  Specifications about the Ethernet PHY can be found at:
+    http://www.ti.com/lit/ds/symlink/dp83822i.pdf
+
+allOf:
+  - $ref: "ethernet-phy.yaml#"
+
+properties:
+  reg:
+    maxItems: 1
+
+  ti,link-loss-low:
+    type: boolean
+    description: |
+       DP83822 PHY in Fiber mode only.
+       Sets the DP83822 to detect a link drop condition when the signal goes
+       high.  If not set then link drop will occur when the signal goes low.
+       This property is only applicable if the fiber mode support is strapped
+       to on.
+
+  ti,fiber-mode:
+    type: boolean
+    description: |
+       DP83822 PHY only.
+       If present the DP83822 PHY is configured to operate in fiber mode
+       Fiber mode support can also be strapped. If the strap pin is not set
+       correctly or not set at all then this boolean can be used to enable it.
+       If the fiber mode is not strapped then signal detection for the PHY
+       is disabled.
+       In fiber mode, auto-negotiation is disabled and the PHY can only work in
+       100base-fx (full and half duplex) modes.
+
+  rx-internal-delay-ps:
+    description: |
+       DP83822 PHY only.
+       Setting this property to a non-zero number sets the RX internal delay
+       for the PHY.  The internal delay for the PHY is fixed to 3.5ns relative
+       to receive data.
+
+  tx-internal-delay-ps:
+    description: |
+       DP83822 PHY only.
+       Setting this property to a non-zero number sets the TX internal delay
+       for the PHY.  The internal delay for the PHY is fixed to 3.5ns relative
+       to transmit data.
+
+required:
+  - reg
+
+examples:
+  - |
+    mdio0 {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      ethphy0: ethernet-phy@0 {
+        reg = <0>;
+        rx-internal-delay-ps = <1>;
+        tx-internal-delay-ps = <1>;
+      };
+    };
+
+...