[PATCH 02/17] dt-bindings: phy: add SpacemiT K3 Innosilicon DP PHY

[Cody Kang <codykang.hk@gmail.com>]

The SpacemiT K3 DisplayPort controller drives its four transmit lanes
through an integrated Innosilicon DP PHY, one PHY per controller. Add a
binding so the controller can reference its transmit PHY and the pixel
clock the PHY's PLL sources.

The PHY's registers are interleaved with its parent controller's inside
one MMIO window, so it owns neither a reg nor a reset and is modelled as
a child of the controller.

It exposes its PLL-generated pixel clock through #clock-cells, so the
APMU pixel-clock mux can select it as a parent through the clock
framework.

Signed-off-by: Cody Kang <codykang.hk@gmail.com>
---
 .../bindings/phy/spacemit,k3-inno-dp-phy.yaml      | 48 ++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/spacemit,k3-inno-dp-phy.yaml b/Documentation/devicetree/bindings/phy/spacemit,k3-inno-dp-phy.yaml
new file mode 100644
index 000000000000..f8f1ef372951
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/spacemit,k3-inno-dp-phy.yaml
@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/spacemit,k3-inno-dp-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SpacemiT K3 Innosilicon DisplayPort PHY
+
+maintainers:
+  - Cody Kang <codykang.hk@gmail.com>
+
+description:
+  Innosilicon four-lane DisplayPort transmit PHY integrated in the SpacemiT
+  K3 SoC, one per DisplayPort controller. Its registers are interleaved with
+  the controller's own inside a single register window, so it is described as
+  a child of the controller and owns neither a reg nor a reset.
+
+  The PHY provides the pixel clock its PLL generates, which the APMU
+  pixel-clock mux takes as one of its inputs.
+
+properties:
+  compatible:
+    const: spacemit,k3-inno-dp-phy
+
+  "#phy-cells":
+    const: 0
+
+  "#clock-cells":
+    const: 0
+
+  clock-output-names:
+    maxItems: 1
+
+required:
+  - compatible
+  - "#phy-cells"
+  - "#clock-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    phy {
+        compatible = "spacemit,k3-inno-dp-phy";
+        #phy-cells = <0>;
+        #clock-cells = <0>;
+        clock-output-names = "edp0_pll_pxclk";
+    };

-- 
2.43.0