dt-bindings: net: phy: vsc8531: Convert to DT schema

Convert VSC8531 Gigabit ethernet phy binding to DT schema format. While
at it add compatible string for VSC8541 PHY which is very much similar
to the VSC8531 PHY and is already supported in the kernel. VSC8541 PHY
is present on the Renesas RZ/T2H EVK.

Signed-off-by: Lad Prabhakar <[e-mail]>
Reviewed-by: Rob Herring (Arm) <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

Documentation/devicetree/bindings/net/mscc-phy-vsc8531.txt

···
-* Microsemi - vsc8531 Giga bit ethernet phy
-
-Optional properties:
-- vsc8531,vddmac	: The vddmac in mV. Allowed values is listed
-			  in the first row of Table 1 (below).
-			  This property is only used in combination
-			  with the 'edge-slowdown' property.
-			  Default value is 3300.
-- vsc8531,edge-slowdown	: % the edge should be slowed down relative to
-			  the fastest possible edge time.
-			  Edge rate sets the drive strength of the MAC
-			  interface output signals.  Changing the
-			  drive strength will affect the edge rate of
-			  the output signal.  The goal of this setting
-			  is to help reduce electrical emission (EMI)
-			  by being able to reprogram drive strength
-			  and in effect slow down the edge rate if
-			  desired.
-			  To adjust the edge-slowdown, the 'vddmac'
-			  must be specified. Table 1 lists the
-			  supported edge-slowdown values for a given
-			  'vddmac'.
-			  Default value is 0%.
-			  Ref: Table:1 - Edge rate change (below).
-- vsc8531,led-[N]-mode	: LED mode. Specify how the LED[N] should behave.
-			  N depends on the number of LEDs supported by a
-			  PHY.
-			  Allowed values are defined in
-			  "include/dt-bindings/net/mscc-phy-vsc8531.h".
-			  Default values are VSC8531_LINK_1000_ACTIVITY (1),
-			  VSC8531_LINK_100_ACTIVITY (2),
-			  VSC8531_LINK_ACTIVITY (0) and
-			  VSC8531_DUPLEX_COLLISION (8).
-- load-save-gpios	: GPIO used for the load/save operation of the PTP
-			  hardware clock (PHC).
-
-
-Table: 1 - Edge rate change
-----------------------------------------------------------------|
-| 		Edge Rate Change (VDDMAC)			|
-|								|
-| 3300 mV	2500 mV		1800 mV		1500 mV		|
-|---------------------------------------------------------------|
-| 0%		0%		0%		0%		|
-| (Fastest)			(recommended)	(recommended)	|
-|---------------------------------------------------------------|
-| 2%		3%		5%		6%		|
-|---------------------------------------------------------------|
-| 4%		6%		9%		14%		|
-|---------------------------------------------------------------|
-| 7%		10%		16%		21%		|
-|(recommended)	(recommended)					|
-|---------------------------------------------------------------|
-| 10%		14%		23%		29%		|
-|---------------------------------------------------------------|
-| 17%		23%		35%		42%		|
-|---------------------------------------------------------------|
-| 29%		37%		52%		58%		|
-|---------------------------------------------------------------|
-| 53%		63%		76%		77%		|
-| (slowest)							|
-|---------------------------------------------------------------|
-
-Example:
-
-        vsc8531_0: ethernet-phy@0 {
-                compatible = "ethernet-phy-id0007.0570";
-                vsc8531,vddmac		= <3300>;
-                vsc8531,edge-slowdown	= <7>;
-                vsc8531,led-0-mode	= <VSC8531_LINK_1000_ACTIVITY>;
-                vsc8531,led-1-mode	= <VSC8531_LINK_100_ACTIVITY>;
-		load-save-gpios		= <&gpio 10 GPIO_ACTIVE_HIGH>;
-        };

Documentation/devicetree/bindings/net/mscc-phy-vsc8531.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/mscc-phy-vsc8531.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microsemi VSC8531 Gigabit Ethernet PHY
+
+maintainers:
+  - Lad Prabhakar <[e-mail]>
+
+description:
+  The VSC8531 is a Gigabit Ethernet PHY with configurable MAC interface
+  drive strength and LED modes.
+
+allOf:
+  - $ref: ethernet-phy.yaml#
+
+select:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - ethernet-phy-id0007.0570 # VSC8531
+          - ethernet-phy-id0007.0772 # VSC8541
+  required:
+    - compatible
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - ethernet-phy-id0007.0570 # VSC8531
+          - ethernet-phy-id0007.0772 # VSC8541
+      - const: ethernet-phy-ieee802.3-c22
+
+  vsc8531,vddmac:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      The VDDMAC voltage in millivolts. This property is used in combination
+      with the edge-slowdown property to control the drive strength of the
+      MAC interface output signals.
+    enum: [3300, 2500, 1800, 1500]
+    default: 3300
+
+  vsc8531,edge-slowdown:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: >
+      Percentage by which the edge rate should be slowed down relative to
+      the fastest possible edge time. This setting helps reduce electromagnetic
+      interference (EMI) by adjusting the drive strength of the MAC interface
+      output signals. Valid values depend on the vddmac voltage setting
+      according to the edge rate change table in the datasheet.
+
+      - When vsc8531,vddmac = 3300 mV: allowed values are 0, 2, 4, 7, 10, 17, 29, and 53.
+        (Recommended: 7)
+      - When vsc8531,vddmac = 2500 mV: allowed values are 0, 3, 6, 10, 14, 23, 37, and 63.
+        (Recommended: 10)
+      - When vsc8531,vddmac = 1800 mV: allowed values are 0, 5, 9, 16, 23, 35, 52, and 76.
+        (Recommended: 0)
+      - When vsc8531,vddmac = 1500 mV: allowed values are 0, 6, 14, 21, 29, 42, 58, and 77.
+        (Recommended: 0)
+    enum: [0, 2, 3, 4, 5, 6, 7, 9, 10, 14, 16, 17, 21, 23, 29, 35, 37, 42, 52, 53, 58, 63, 76, 77]
+    default: 0
+
+  vsc8531,led-0-mode:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: LED[0] behavior mode. See include/dt-bindings/net/mscc-phy-vsc8531.h
+      for available modes.
+    minimum: 0
+    maximum: 15
+    default: 1
+
+  vsc8531,led-1-mode:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: LED[1] behavior mode. See include/dt-bindings/net/mscc-phy-vsc8531.h
+      for available modes.
+    minimum: 0
+    maximum: 15
+    default: 2
+
+  vsc8531,led-2-mode:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: LED[2] behavior mode. See include/dt-bindings/net/mscc-phy-vsc8531.h
+      for available modes.
+    minimum: 0
+    maximum: 15
+    default: 0
+
+  vsc8531,led-3-mode:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: LED[3] behavior mode. See include/dt-bindings/net/mscc-phy-vsc8531.h
+      for available modes.
+    minimum: 0
+    maximum: 15
+    default: 8
+
+  load-save-gpios:
+    description: GPIO phandle used for the load/save operation of the PTP hardware
+      clock (PHC).
+    maxItems: 1
+
+dependencies:
+  vsc8531,edge-slowdown:
+    - vsc8531,vddmac
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/net/mscc-phy-vsc8531.h>
+
+    mdio {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        ethernet-phy@0 {
+            compatible = "ethernet-phy-id0007.0772", "ethernet-phy-ieee802.3-c22";
+            reg = <0>;
+            vsc8531,vddmac = <3300>;
+            vsc8531,edge-slowdown = <7>;
+            vsc8531,led-0-mode = <VSC8531_LINK_1000_ACTIVITY>;
+            vsc8531,led-1-mode = <VSC8531_LINK_100_ACTIVITY>;
+            load-save-gpios = <&gpio 10 GPIO_ACTIVE_HIGH>;
+        };
+    };

Documentation/devicetree/bindings/vendor-prefixes.yaml

···
   "^(keypad|m25p|max8952|max8997|max8998|mpmc),.*": true
   "^(pciclass|pinctrl-single|#pinctrl-single|PowerPC),.*": true
   "^(pl022|pxa-mmc|rcar_sound|rotary-encoder|s5m8767|sdhci),.*": true
-  "^(simple-audio-card|st-plgpio|st-spics|ts),.*": true
+  "^(simple-audio-card|st-plgpio|st-spics|ts|vsc8531),.*": true
   "^pool[0-3],.*": true
 
   # Keep list in alphabetical order.