[PATCH RFC v3 1/6] dt-bindings: display: add Unisoc's drm master bindings

[Kevin Tang <kevin3.tang@gmail.com>]

From: Kevin Tang <kevin.tang@unisoc.com>

The Unisoc DRM master device is a virtual device needed to list all
DPU devices or other display interface nodes that comprise the
graphics subsystem

Cc: Orson Zhai <orsonzhai@gmail.com>
Cc: Baolin Wang <baolin.wang@linaro.org>
Cc: Chunyan Zhang <zhang.lyra@gmail.com>
Signed-off-by: Kevin Tang <kevin.tang@unisoc.com>
---
 .../devicetree/bindings/display/sprd/drm.yaml      | 38 ++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/sprd/drm.yaml

diff --git a/Documentation/devicetree/bindings/display/sprd/drm.yaml b/Documentation/devicetree/bindings/display/sprd/drm.yaml
new file mode 100644
index 0000000..1614ca6
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/sprd/drm.yaml
@@ -0,0 +1,38 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/sprd/drm.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Unisoc DRM master device
+
+maintainers:
+  - David Airlie <airlied@linux.ie>
+  - Daniel Vetter <daniel@ffwll.ch>
+  - Rob Herring <robh+dt@kernel.org>
+  - Mark Rutland <mark.rutland@arm.com>
+
+description: |
+  The Unisoc DRM master device is a virtual device needed to list all
+  DPU devices or other display interface nodes that comprise the
+  graphics subsystem.
+
+properties:
+  compatible:
+    const: sprd,display-subsystem
+
+  ports:
+    description:
+      Should contain a list of phandles pointing to display interface port
+      of DPU devices.
+
+required:
+  - compatible
+  - ports
+
+examples:
+  - |
+    display-subsystem {
+        compatible = "sprd,display-subsystem";
+        ports = <&dpu_out>;
+    };
\ No newline at end of file
-- 
2.7.4