Document the MDSS hardware found on the Qualcomm SA8775P platform.

Signed-off-by: Mahadevan <redacted>
---

[v2]
- Use fake DISPCC nodes to avoid clock dependencies in dt-bindings. [Dmitry]
- Update bindings by fixing dt_binding_check tool errors (update includes in example),
  adding proper spacing and indentation in binding example, dropping unused labels,
  dropping status disable, adding reset node. [Dmitry, Rob, Krzysztof]

---
 .../display/msm/qcom,sa8775p-mdss.yaml        | 239 ++++++++++++++++++
 1 file changed, 239 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/msm/qcom,sa8775p-mdss.yaml

diff --git a/Documentation/devicetree/bindings/display/msm/qcom,sa8775p-mdss.yaml b/Documentation/devicetree/bindings/display/msm/qcom,sa8775p-mdss.yaml
new file mode 100644
index 000000000000..e610b66ffa9f
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/msm/qcom,sa8775p-mdss.yaml

@@ -0,0 +1,239 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/msm/qcom,sa8775p-mdss.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Technologies, Inc. SA87755P Display MDSS
+
+maintainers:
+  - Mahadevan <quic_mahap@quicinc.com>
+
+description:
+  SA8775P MSM Mobile Display Subsystem(MDSS), which encapsulates sub-blocks like
+  DPU display controller, DP interfaces and EDP etc.
+
+$ref: /schemas/display/msm/mdss-common.yaml#
+
+properties:
+  compatible:
+    const: qcom,sa8775p-mdss
+
+  clocks:
+    items:
+      - description: Display AHB
+      - description: Display hf AXI
+      - description: Display core
+
+  iommus:
+    maxItems: 1
+
+  interconnects:
+    maxItems: 3
+
+  interconnect-names:
+    maxItems: 3
+
+patternProperties:
+  "^display-controller@[0-9a-f]+$":
+    type: object
+    properties:
+      compatible:
+        const: qcom,sa8775p-dpu
+
+  "^displayport-controller@[0-9a-f]+$":
+    type: object
+    properties:
+      compatible:
+        items:
+          - const: qcom,sa8775p-dp
+
+required:
+  - compatible
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interconnect/qcom,icc.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/qcom,sa8775p-gcc.h>
+    #include <dt-bindings/interconnect/qcom,sa8775p-rpmh.h>
+    #include <dt-bindings/power/qcom,rpmhpd.h>
+    #include <dt-bindings/power/qcom-rpmpd.h>
+
+    display-subsystem@ae00000 {
+        compatible = "qcom,sa8775p-mdss";
+        reg = <0 0x0ae00000 0 0x1000>;