linux-kernel - [PATCH v1 1/6] dt-bindings: display: add Unisoc's drm master bindings

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Message-Id: <1607352626-26088-2-git-send-email-kevin3.tang@gmail.com>
Date:   Mon,  7 Dec 2020 22:50:21 +0800
From:   Kevin Tang <kevin3.tang@...il.com>
To:     maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        sean@...rly.run, airlied@...ux.ie, daniel@...ll.ch,
        robh+dt@...nel.org, mark.rutland@....com, kevin3.tang@...il.com
Cc:     orsonzhai@...il.com, zhang.lyra@...il.com,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org
Subject: [PATCH v1 1/6] dt-bindings: display: add Unisoc's drm master bindings

From: Kevin Tang <kevin.tang@...soc.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

Unisoc's display pipeline have several components as below
description, multi display controllers and corresponding physical interfaces.
For different display scenarios, dpu0 and dpu1 maybe binding to
different encoder.

E.g:
  dpu0 and dpu1 both binding to DSI for dual mipi-dsi display;
  dpu0 binding to DSI for primary display, and dpu1 binding to DP for external display;

Cc: Orson Zhai <orsonzhai@...il.com>
Cc: Chunyan Zhang <zhang.lyra@...il.com>
Signed-off-by: Kevin Tang <kevin.tang@...soc.com>
---
 .../display/sprd/sprd,display-subsystem.yaml       | 64 ++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/sprd/sprd,display-subsystem.yaml

diff --git a/Documentation/devicetree/bindings/display/sprd/sprd,display-subsystem.yaml b/Documentation/devicetree/bindings/display/sprd/sprd,display-subsystem.yaml
new file mode 100644
index 0000000..3d107e9
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/sprd/sprd,display-subsystem.yaml
@@ -0,0 +1,64 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/sprd/sprd,display-subsystem.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Unisoc DRM master device
+
+maintainers:
+  - Kevin Tang <kevin.tang@...soc.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.
+
+  Unisoc's display pipeline have several components as below description,
+  multi display controllers and corresponding physical interfaces.
+  For different display scenarios, dpu0 and dpu1 maybe binding to different
+  encoder.
+
+  E.g:
+  dpu0 and dpu1 both binding to DSI for dual mipi-dsi display;
+  dpu0 binding to DSI for primary display, and dpu1 binding to DP for external display;
+
+          +-----------------------------------------+
+          |                                         |
+          |                            +---------+  |
+  +----+  |   +----+    +---------+    |DPHY/CPHY|  |   +------+
+  |    +----->+dpu0+--->+MIPI|DSI +--->+Combo    +----->+Panel0|
+  |AXI |  |   +----+    +---------+    +---------+  |   +------+
+  |    |  |                  ^                      |
+  |    |  |                  |                      |
+  |    |  |      +-----------+                      |
+  |    |  |      |                                  |
+  |APB |  |   +--+-+    +-----------+    +---+      |   +------+
+  |    +----->+dpu1+--->+DisplayPort+--->+PHY+--------->+Panel1|
+  |    |  |   +----+    +-----------+    +---+      |   +------+
+  +----+  |                                         |
+          +-----------------------------------------+
+
+properties:
+  compatible:
+    const: sprd,display-subsystem
+
+  ports:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description:
+      Should contain a list of phandles pointing to display interface port
+      of DPU devices.
+
+required:
+  - compatible
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    display-subsystem {
+        compatible = "sprd,display-subsystem";
+        ports = <&dpu_out>;
+    };
+
-- 
2.7.4