dt-bindings: Add devicetree bindings

Add snapshot of device tree bindings from keystone common kernel, branch
"android-mainline-keystone-qcom-release" at c4c12103f9c0 ("Snap for 9228065
from e32903b9a63bb558df8b803b076619c53c16baad to
android-mainline-keystone-qcom-release").

Change-Id: I7682079615cbd9f29340a5c1f2a1d84ec441a1f1
Signed-off-by: Melody Olvera <quic_molvera@quicinc.com>

bindings/display/simple-framebuffer.yaml

@@ -0,0 +1,197 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/simple-framebuffer.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Simple Framebuffer
+
+maintainers:
+  - Hans de Goede <hdegoede@redhat.com>
+
+description: |+
+  A simple frame-buffer describes a frame-buffer setup by firmware or
+  the bootloader, with the assumption that the display hardware has
+  already been set up to scan out from the memory pointed to by the
+  reg property.
+
+  Since simplefb nodes represent runtime information they must be
+  sub-nodes of the chosen node (*). Simplefb nodes must be named
+  framebuffer@<address>.
+
+  If the devicetree contains nodes for the display hardware used by a
+  simplefb, then the simplefb node must contain a property called
+  display, which contains a phandle pointing to the primary display
+  hw node, so that the OS knows which simplefb to disable when handing
+  over control to a driver for the real hardware. The bindings for the
+  hw nodes must specify which node is considered the primary node.
+
+  It is advised to add display# aliases to help the OS determine how
+  to number things. If display# aliases are used, then if the simplefb
+  node contains a display property then the /aliases/display# path
+  must point to the display hw node the display property points to,
+  otherwise it must point directly to the simplefb node.
+
+  If a simplefb node represents the preferred console for user
+  interaction, then the chosen node stdout-path property should point
+  to it, or to the primary display hw node, as with display#
+  aliases. If display aliases are used then it should be set to the
+  alias instead.
+
+  It is advised that devicetree files contain pre-filled, disabled
+  framebuffer nodes, so that the firmware only needs to update the
+  mode information and enable them. This way if e.g. later on support
+  for more display clocks get added, the simplefb nodes will already
+  contain this info and the firmware does not need to be updated.
+
+  If pre-filled framebuffer nodes are used, the firmware may need
+  extra information to find the right node. In that case an extra
+  platform specific compatible and platform specific properties should
+  be used and documented.
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - apple,simple-framebuffer
+              - allwinner,simple-framebuffer
+              - amlogic,simple-framebuffer
+          - const: simple-framebuffer
+      - const: simple-framebuffer
+
+  reg:
+    description: Location and size of the framebuffer memory
+
+  clocks:
+    description: List of clocks used by the framebuffer.
+
+  power-domains:
+    description: List of power domains used by the framebuffer.
+
+  width:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Width of the framebuffer in pixels
+
+  height:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Height of the framebuffer in pixels
+
+  stride:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Number of bytes of a line in the framebuffer
+
+  format:
+    description: >
+      Format of the framebuffer:
+        * `a1r5g5b5` - 16-bit pixels, d[15]=a, d[14:10]=r, d[9:5]=g, d[4:0]=b
+        * `a2r10g10b10` - 32-bit pixels, d[31:30]=a, d[29:20]=r, d[19:10]=g, d[9:0]=b
+        * `a8b8g8r8` - 32-bit pixels, d[31:24]=a, d[23:16]=b, d[15:8]=g, d[7:0]=r
+        * `a8r8g8b8` - 32-bit pixels, d[31:24]=a, d[23:16]=r, d[15:8]=g, d[7:0]=b
+        * `r5g6b5` - 16-bit pixels, d[15:11]=r, d[10:5]=g, d[4:0]=b
+        * `r5g5b5a1` - 16-bit pixels, d[15:11]=r, d[10:6]=g, d[5:1]=b d[1:0]=a
+        * `r8g8b8` - 24-bit pixels, d[23:16]=r, d[15:8]=g, d[7:0]=b
+        * `x1r5g5b5` - 16-bit pixels, d[14:10]=r, d[9:5]=g, d[4:0]=b
+        * `x2r10g10b10` - 32-bit pixels, d[29:20]=r, d[19:10]=g, d[9:0]=b
+        * `x8r8g8b8` - 32-bit pixels, d[23:16]=r, d[15:8]=g, d[7:0]=b
+    enum:
+      - a1r5g5b5
+      - a2r10g10b10
+      - a8b8g8r8
+      - a8r8g8b8
+      - r5g6b5
+      - r5g5b5a1
+      - r8g8b8
+      - x1r5g5b5
+      - x2r10g10b10
+      - x8r8g8b8
+
+  display:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: Primary display hardware node
+
+  allwinner,pipeline:
+    description: Pipeline used by the framebuffer on Allwinner SoCs
+    enum:
+      - de_be0-lcd0
+      - de_be0-lcd0-hdmi
+      - de_be0-lcd0-tve0
+      - de_be1-lcd0
+      - de_be1-lcd1-hdmi
+      - de_fe0-de_be0-lcd0
+      - de_fe0-de_be0-lcd0-hdmi
+      - de_fe0-de_be0-lcd0-tve0
+      - mixer0-lcd0
+      - mixer0-lcd0-hdmi
+      - mixer1-lcd1-hdmi
+      - mixer1-lcd1-tve
+
+  amlogic,pipeline:
+    description: Pipeline used by the framebuffer on Amlogic SoCs
+    enum:
+      - vpu-cvbs
+      - vpu-hdmi
+
+patternProperties:
+  "^[a-zA-Z0-9-]+-supply$":
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Regulators used by the framebuffer. These should be named
+      according to the names in the device design.
+
+required:
+  # The binding requires also reg, width, height, stride and format,
+  # but usually they will be filled by the bootloader.
+  - compatible
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: allwinner,simple-framebuffer
+
+    then:
+      required:
+        - allwinner,pipeline
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: amlogic,simple-framebuffer
+
+    then:
+      required:
+        - amlogic,pipeline
+
+
+additionalProperties: false
+
+examples:
+  - |
+    / {
+        compatible = "foo";
+        model = "foo";
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        chosen {
+            #address-cells = <1>;
+            #size-cells = <1>;
+            framebuffer0: framebuffer@1d385000 {
+                compatible = "allwinner,simple-framebuffer", "simple-framebuffer";
+                allwinner,pipeline = "de_be0-lcd0";
+                reg = <0x1d385000 3840000>;
+                width = <1600>;
+                height = <1200>;
+                stride = <3200>;
+                format = "r5g6b5";
+                clocks = <&ahb_gates 36>, <&ahb_gates 43>, <&ahb_gates 44>;
+                lcd-supply = <&reg_dc1sw>;
+                display = <&lcdc0>;
+            };
+        };
+    };
+
+...