[PATCH v6 1/4] dt-bindings: net: phy: Add subnode for LED configuration

[Matthias Kaehlcke <mka@chromium.org>]

The LED behavior of some Ethernet PHYs is configurable. Add an
optional 'leds' subnode with a child node for each LED to be
configured. The binding aims to be compatible with the common
LED binding (see devicetree/bindings/leds/common.txt).

A LED can be configured to be:

- 'on' when a link is active, some PHYs allow configuration for
  certain link speeds
  speeds
- 'off'
- blink on RX/TX activity, some PHYs allow configuration for
  certain link speeds

For the configuration to be effective it needs to be supported by
the hardware and the corresponding PHY driver.

Suggested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
---
Changes in v6:
- none

Changes in v5:
- renamed triggers from 'phy_link_<speed>_active' to 'phy-link-<speed>'
- added entries for 'phy-link-<speed>-activity'
- added 'phy-link' and 'phy-link-activity' for triggers with any link
  speed
- added entry for trigger 'none'

Changes in v4:
- patch added to the series
---
 .../devicetree/bindings/net/ethernet-phy.yaml | 59 +++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/ethernet-phy.yaml b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
index f70f18ff821f..98ba320f828b 100644
--- a/Documentation/devicetree/bindings/net/ethernet-phy.yaml
+++ b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
@@ -153,6 +153,50 @@ properties:
       Delay after the reset was deasserted in microseconds. If
       this property is missing the delay will be skipped.
 
+patternProperties:
+  "^leds$":
+    type: object
+    description:
+      Subnode with configuration of the PHY LEDs.
+
+    patternProperties:
+      "^led@[0-9]+$":
+        type: object
+        description:
+          Subnode with the configuration of a single PHY LED.
+
+    properties:
+      reg:
+        description:
+          The ID number of the LED, typically corresponds to a hardware ID.
+        $ref: "/schemas/types.yaml#/definitions/uint32"
+
+      linux,default-trigger:
+        description:
+          This parameter, if present, is a string specifying the trigger
+          assigned to the LED. Supported triggers are:
+            "none" - LED will be solid off
+            "phy-link" - LED will be solid on when a link is active
+            "phy-link-10m" - LED will be solid on when a 10Mb/s link is active
+            "phy-link-100m" - LED will be solid on when a 100Mb/s link is active
+            "phy-link-1g" - LED will be solid on when a 1Gb/s link is active
+            "phy-link-10g" - LED will be solid on when a 10Gb/s link is active
+            "phy-link-activity" - LED will be on when link is active and blink
+                                  off with activity.
+            "phy-link-10m-activity" - LED will be on when 10Mb/s link is active
+                                      and blink off with activity.
+            "phy-link-100m-activity" - LED will be on when 100Mb/s link is
+                                       active and blink off with activity.
+            "phy-link-1g-activity" - LED will be on when 1Gb/s link is active
+                                     and blink off with activity.
+            "phy-link-10g-activity" - LED will be on when 10Gb/s link is active
+                                      and blink off with activity.
+
+        $ref: "/schemas/types.yaml#/definitions/string"
+
+    required:
+      - reg
+
 required:
   - reg
 
@@ -173,5 +217,20 @@ examples:
             reset-gpios = <&gpio1 4 1>;
             reset-assert-us = <1000>;
             reset-deassert-us = <2000>;
+
+            leds {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                led@0 {
+                    reg = <0>;
+                    linux,default-trigger = "phy-link-1g";
+                };
+
+                led@1 {
+                    reg = <1>;
+                    linux,default-trigger = "phy-link-100m-activity";
+                };
+            };
         };
     };
-- 
2.23.0.rc1.153.gdeed80330f-goog