dt-bindings: display: Add Apple pre-DCP display controller

Add bindings for a secondary display controller present on certain
Apple laptops.

Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Neal Gompa <[e-mail]>
Signed-off-by: Sasha Finkelstein <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
Signed-off-by: Alyssa Rosenzweig <[e-mail]>

Documentation/devicetree/bindings/display/apple,h7-display-pipe-mipi.yaml

···
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/apple,h7-display-pipe-mipi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Apple pre-DCP display controller MIPI interface
+
+maintainers:
+  - Sasha Finkelstein <[e-mail]>
+
+description:
+  The MIPI controller part of the pre-DCP Apple display controller
+
+allOf:
+  - $ref: dsi-controller.yaml#
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - apple,t8112-display-pipe-mipi
+          - apple,t8103-display-pipe-mipi
+      - const: apple,h7-display-pipe-mipi
+
+  reg:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+
+    properties:
+      port@0:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Input port. Always connected to the primary controller
+
+      port@1:
+        $ref: /schemas/graph.yaml#/properties/port
+        description: Output MIPI DSI port to the panel
+
+    required:
+      - port@0
+      - port@1
+
+required:
+  - compatible
+  - reg
+  - ports
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    dsi@28200000 {
+        compatible = "apple,t8103-display-pipe-mipi", "apple,h7-display-pipe-mipi";
+        reg = <0x28200000 0xc000>;
+        power-domains = <&ps_dispdfr_mipi>;
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port@0 {
+                reg = <0>;
+
+                dfr_adp_out_mipi: endpoint {
+                    remote-endpoint = <&dfr_adp_out_mipi>;
+                };
+            };
+
+            port@1 {
+                reg = <1>;
+
+                dfr_panel_in: endpoint {
+                    remote-endpoint = <&dfr_mipi_out_panel>;
+                };
+            };
+        };
+    };
+...

Documentation/devicetree/bindings/display/apple,h7-display-pipe.yaml

···
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/apple,h7-display-pipe.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Apple pre-DCP display controller
+
+maintainers:
+  - Sasha Finkelstein <[e-mail]>
+
+description:
+  A secondary display controller used to drive the "touchbar" on
+  certain Apple laptops.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - apple,t8112-display-pipe
+          - apple,t8103-display-pipe
+      - const: apple,h7-display-pipe
+
+  reg:
+    items:
+      - description: Primary register block, controls planes and blending
+      - description:
+          Contains other configuration registers like interrupt
+          and FIFO control
+
+  reg-names:
+    items:
+      - const: be
+      - const: fe
+
+  power-domains:
+    description:
+      Phandles to pmgr entries that are needed for this controller to turn on.
+      Aside from that, their specific functions are unknown
+    maxItems: 2
+
+  interrupts:
+    items:
+      - description: Unknown function
+      - description: Primary interrupt. Vsync events are reported via it
+
+  interrupt-names:
+    items:
+      - const: be
+      - const: fe
+
+  iommus:
+    maxItems: 1
+
+  port:
+    $ref: /schemas/graph.yaml#/properties/port
+    description: Output port. Always connected to apple,h7-display-pipe-mipi
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/apple-aic.h>
+    display-pipe@28200000 {
+        compatible = "apple,t8103-display-pipe", "apple,h7-display-pipe";
+        reg = <0x28200000 0xc000>,
+              <0x28400000 0x4000>;
+        reg-names = "be", "fe";
+        power-domains = <&ps_dispdfr_fe>, <&ps_dispdfr_be>;
+        interrupt-parent = <&aic>;
+        interrupts = <AIC_IRQ 502 IRQ_TYPE_LEVEL_HIGH>,
+                     <AIC_IRQ 506 IRQ_TYPE_LEVEL_HIGH>;
+        interrupt-names = "be", "fe";
+        iommus = <&displaydfr_dart 0>;
+
+        port {
+            dfr_adp_out_mipi: endpoint {
+                remote-endpoint = <&dfr_mipi_in_adp>;
+            };
+        };
+    };
+...

Documentation/devicetree/bindings/display/panel/apple,summit.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/apple,summit.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Apple "Summit" display panel
+
+maintainers:
+  - Sasha Finkelstein <[e-mail]>
+
+description:
+  An OLED panel used as a touchbar on certain Apple laptops.
+  Contains a backlight device, which controls brightness of the panel itself.
+  The backlight common properties are included for this reason
+
+allOf:
+  - $ref: panel-common.yaml#
+  - $ref: /schemas/leds/backlight/common.yaml#
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - apple,j293-summit
+          - apple,j493-summit
+      - const: apple,summit
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - max-brightness
+  - port
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    dsi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        panel@0 {
+            compatible = "apple,j293-summit", "apple,summit";
+            reg = <0>;
+            max-brightness = <255>;
+
+            port {
+                endpoint {
+                    remote-endpoint = <&dfr_bridge_out>;
+                };
+            };
+        };
+    };
+...