dt-bindings: phy: Introduce Qualcomm eDP PHY binding

Introduce a binding for the eDP PHY hardware block found in several
different Qualcomm platforms.
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20211103234410.1352424-1-bjorn.andersson@linaro.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/qcom,edp-phy.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/phy/qcom,edp-phy.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Qualcomm eDP PHY
+
+maintainers:
+  - Bjorn Andersson <bjorn.andersson@linaro.org>
+
+description:
+  The Qualcomm eDP PHY is found in a number of Qualcomm platform and provides
+  the physical interface for Embedded Display Port.
+
+properties:
+  compatible:
+    const: qcom,sc8180x-edp-phy
+
+  reg:
+    items:
+      - description: PHY base register block
+      - description: tx0 register block
+      - description: tx1 register block
+      - description: PLL register block
+
+  clocks:
+    maxItems: 2
+
+  clock-names:
+    items:
+      - const: aux
+      - const: cfg_ahb
+
+  "#clock-cells":
+    const: 1
+
+  "#phy-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - "#clock-cells"
+  - "#phy-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    phy@aec2a00 {
+      compatible = "qcom,sc8180x-edp-phy";
+      reg = <0x0aec2a00 0x1c0>,
+            <0x0aec2200 0xa0>,
+            <0x0aec2600 0xa0>,
+            <0x0aec2000 0x19c>;
+
+      clocks = <&dispcc 0>, <&dispcc 1>;
+      clock-names = "aux", "cfg_ahb";
+
+      #clock-cells = <1>;
+      #phy-cells = <0>;
+    };
+...