[PATCH v4 6/7] dt-bindings: display: tegra: Document 8-bit CPU parallel interface

[Svyatoslav Ryhel <clamor95@gmail.com>]

Document 8-bit CPU parallel MIPI DBI Type B interface provided by
Tegra20/30 SoCs display controller.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---
 .../display/tegra/nvidia,tegra20-dbi.yaml     | 108 ++++++++++++++++++
 .../display/tegra/nvidia,tegra20-dc.yaml      |  15 +++
 2 files changed, 123 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-dbi.yaml

diff --git a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-dbi.yaml b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-dbi.yaml
new file mode 100644
index 0000000000000..6b4fd20c5817c
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-dbi.yaml
@@ -0,0 +1,108 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/tegra/nvidia,tegra20-dbi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Nvidia Tegra Display Controller based MIPI DBI Type B interface
+
+maintainers:
+  - Svyatoslav Ryhel <clamor95@gmail.com>
+
+description: The display controller in Tegra20/30 SoCs features an
+  8-bit SPI interface that closely resembles the MIPI DBI Type B
+  protocol and is referred to as '8-bit CPU'. Each display controller
+  provides two such interfaces, which can be used to send MIPI DCS
+  commands to initialize and control the panel while image data is
+  transmitted via 16/18/24-line RGB.
+
+properties:
+  nvidia,index:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Number of DBI interface used 0 - primary, 1 - secondary. If
+      property is not set, primary will be used.
+    enum: [ 0, 1 ]
+
+  panel:
+    type: object
+    description: Node of supported panel driven by the bridge.
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/$defs/port-base
+        unevaluatedProperties: false
+        description: Video port for RGB input.
+
+        properties:
+          endpoint:
+            $ref: /schemas/graph.yaml#/$defs/endpoint-base
+            unevaluatedProperties: false
+
+            properties:
+              bus-width:
+                enum: [ 16, 18, 24 ]
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Video port for DBI output (panel or connector).
+
+    required:
+      - port@0
+      - port@1
+
+required:
+  - panel
+  - ports
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    dbi {
+        nvidia,index = <0>;
+
+        panel {
+            compatible = "hit,tx10d07vm0baa";
+
+            reset-gpios = <&gpio 175 GPIO_ACTIVE_LOW>;
+
+            avci-supply = <&vcc_2v8_lcd>;
+            iovcc-supply = <&iovcc_1v8_lcd>;
+
+            backlight = <&backlight>;
+
+            port {
+                panel_input: endpoint {
+                    remote-endpoint = <&bridge_output>;
+                };
+            };
+        };
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port@0 {
+                reg = <0>;
+
+                bridge_input: endpoint {
+                    remote-endpoint = <&dpi_output>;
+                    bus-width = <24>;
+                };
+            };
+
+            port@1 {
+                reg = <1>;
+
+                bridge_output: endpoint {
+                    remote-endpoint = <&panel_input>;
+                };
+            };
+        };
+    };
diff --git a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-dc.yaml b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-dc.yaml
index 69be95afd5627..a014bf0dd508d 100644
--- a/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-dc.yaml
+++ b/Documentation/devicetree/bindings/display/tegra/nvidia,tegra20-dc.yaml
@@ -76,6 +76,9 @@ properties:
     $ref: /schemas/types.yaml#/definitions/phandle-array
     description: A list of phandles of outputs that this display controller can drive.
 
+  dbi:
+    $ref: /schemas/display/tegra/nvidia,tegra20-dbi.yaml#
+
   rgb:
     type: object
 
@@ -155,6 +158,18 @@ allOf:
             - const: wind
             - const: wint
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - nvidia,tegra114-dc
+              - nvidia,tegra124-dc
+              - nvidia,tegra210-dc
+    then:
+      properties:
+        dbi: false
+
 additionalProperties: false
 
 required:
-- 
2.53.0