[PATCH net-next v3 1/2] dt-bindings: net: pse-pd: Add bindings for LTC4266 PSE Controller

[Kyle Swenson <kyle.swenson@est.tech>]

Add the LTC4266 Power Sourcing Equipment controller device tree bindings
documentation.

Signed-off-by: Kyle Swenson <kyle.swenson@est.tech>
---
 .../bindings/net/pse-pd/lltc,ltc4266.yaml     | 180 ++++++++++++++++++
 1 file changed, 180 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/pse-pd/lltc,ltc4266.yaml

diff --git a/Documentation/devicetree/bindings/net/pse-pd/lltc,ltc4266.yaml b/Documentation/devicetree/bindings/net/pse-pd/lltc,ltc4266.yaml
new file mode 100644
index 000000000000..e11c9d601eee
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/pse-pd/lltc,ltc4266.yaml
@@ -0,0 +1,180 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/pse-pd/lltc,ltc4266.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Linear Technology LTC4266 Power Sourcing Equipment controller
+
+maintainers:
+  - Kyle Swenson <kyle.swenson@est.tech>
+
+allOf:
+  - $ref: pse-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - lltc,ltc4266
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  channels:
+    type: object
+    additionalProperties: false
+    description:
+      Defines the 4 physical delivery channels on the controller that can be
+      referenced by PSE PIs through their "pairsets" property. The actual port
+      matrix mapping is created when PSE PIs reference these channels in their
+      pairsets.
+
+    properties:
+      '#address-cells':
+        const: 1
+
+      '#size-cells':
+        const: 0
+
+    patternProperties:
+      '^channel@[0-3]$':
+        type: object
+        additionalProperties: false
+
+        properties:
+          reg:
+            maxItems: 1
+
+          sense-resistor-micro-ohms:
+            description: Sense resistor connected to the channel's MOSFET, used
+              for current measurement and for overcurrent detection. The I_CUT
+              and I_LIM register encodings depend on which value is fitted, so
+              a wrong value programs the wrong thresholds.
+            enum: [250000, 500000]
+
+        required:
+          - reg
+          - sense-resistor-micro-ohms
+
+    required:
+      - '#address-cells'
+      - '#size-cells'
+
+  pse-pis:
+    type: object
+    additionalProperties: false
+
+    properties:
+      '#address-cells':
+        const: 1
+
+      '#size-cells':
+        const: 0
+
+    patternProperties:
+      '^pse-pi@[0-3]$':
+        type: object
+        additionalProperties: true
+        properties:
+          pairsets:
+            description: The LTC4266 delivers power to a PI over a single
+              pairset, driven by one of the controller's four channels. There
+              is no 4-pair mode spreading a PI over two channels, so exactly
+              one channel phandle is expected.
+            maxItems: 1
+          pairset-names:
+            maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - channels
+  - pse-pis
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      ethernet-pse@2f {
+        compatible = "lltc,ltc4266";
+        reg = <0x2f>;
+        interrupts = <8 IRQ_TYPE_LEVEL_LOW>;
+        interrupt-parent = <&gpio>;
+
+        channels {
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          phys0: channel@0 {
+            reg = <0>;
+            sense-resistor-micro-ohms = <500000>;
+          };
+
+          phys1: channel@1 {
+            reg = <1>;
+            sense-resistor-micro-ohms = <500000>;
+          };
+
+          phys2: channel@2 {
+            reg = <2>;
+            sense-resistor-micro-ohms = <500000>;
+          };
+
+          phys3: channel@3 {
+            reg = <3>;
+            sense-resistor-micro-ohms = <500000>;
+          };
+        };
+
+        pse-pis {
+          #address-cells = <1>;
+          #size-cells = <0>;
+
+          pse_pi0: pse-pi@0 {
+            reg = <0>;
+            #pse-cells = <0>;
+            pairset-names = "alternative-a";
+            pairsets = <&phys0>;
+            polarity-supported = "MDI";
+            vpwr-supply = <&vreg_pse>;
+          };
+
+          pse_pi1: pse-pi@1 {
+            reg = <1>;
+            #pse-cells = <0>;
+            pairset-names = "alternative-a";
+            pairsets = <&phys1>;
+            polarity-supported = "MDI";
+            vpwr-supply = <&vreg_pse>;
+          };
+
+          pse_pi2: pse-pi@2 {
+            reg = <2>;
+            #pse-cells = <0>;
+            pairset-names = "alternative-a";
+            pairsets = <&phys2>;
+            polarity-supported = "MDI";
+            vpwr-supply = <&vreg_pse>;
+          };
+
+          pse_pi3: pse-pi@3 {
+            reg = <3>;
+            #pse-cells = <0>;
+            pairset-names = "alternative-a";
+            pairsets = <&phys3>;
+            polarity-supported = "MDI";
+            vpwr-supply = <&vreg_pse>;
+          };
+        };
+      };
+    };
-- 
2.55.0