dt-bindings: display: amlogic, meson-vpu: convert to yaml

Now that we have the DT validation in place, let's convert the device tree
bindings for the Amlogic Display Controller over to YAML schemas.

The original example has a leftover "dmc" memory cell, that has been
removed in the yaml rewrite.

The port connection table has been dropped in favor of a description
of each port.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190808085522.21950-3-narmstrong@baylibre.com

1 files changed, 137 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/display/amlogic,meson-vpu.yaml b/Documentation/devicetree/bindings/display/amlogic,meson-vpu.yaml
new file mode 100644
index 000000000000..d1205a6697a0
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/amlogic,meson-vpu.yaml
@@ -0,0 +1,137 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2019 BayLibre, SAS
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/display/amlogic,meson-vpu.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Amlogic Meson Display Controller
+
+maintainers:
+  - Neil Armstrong <narmstrong@baylibre.com>
+
+description: |
+  The Amlogic Meson Display controller is composed of several components
+  that are going to be documented below
+
+  DMC|---------------VPU (Video Processing Unit)----------------|------HHI------|
+     | vd1   _______     _____________    _________________     |               |
+  D  |-------|      |----|            |   |                |    |   HDMI PLL    |
+  D  | vd2   | VIU  |    | Video Post |   | Video Encoders |<---|-----VCLK      |
+  R  |-------|      |----| Processing |   |                |    |               |
+     | osd2  |      |    |            |---| Enci ----------|----|-----VDAC------|
+  R  |-------| CSC  |----| Scalers    |   | Encp ----------|----|----HDMI-TX----|
+  A  | osd1  |      |    | Blenders   |   | Encl ----------|----|---------------|
+  M  |-------|______|----|____________|   |________________|    |               |
+  ___|__________________________________________________________|_______________|
+
+
+  VIU: Video Input Unit
+  ---------------------
+
+  The Video Input Unit is in charge of the pixel scanout from the DDR memory.
+  It fetches the frames addresses, stride and parameters from the "Canvas" memory.
+  This part is also in charge of the CSC (Colorspace Conversion).
+  It can handle 2 OSD Planes and 2 Video Planes.
+
+  VPP: Video Post Processing
+  --------------------------
+
+  The Video Post Processing is in charge of the scaling and blending of the
+  various planes into a single pixel stream.
+  There is a special "pre-blending" used by the video planes with a dedicated
+  scaler and a "post-blending" to merge with the OSD Planes.
+  The OSD planes also have a dedicated scaler for one of the OSD.
+
+  VENC: Video Encoders
+  --------------------
+
+  The VENC is composed of the multiple pixel encoders
+   - ENCI : Interlace Video encoder for CVBS and Interlace HDMI
+   - ENCP : Progressive Video Encoder for HDMI
+   - ENCL : LCD LVDS Encoder
+  The VENC Unit gets a Pixel Clocks (VCLK) from a dedicated HDMI PLL and clock
+  tree and provides the scanout clock to the VPP and VIU.
+  The ENCI is connected to a single VDAC for Composite Output.
+  The ENCI and ENCP are connected to an on-chip HDMI Transceiver.
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - amlogic,meson-gxbb-vpu # GXBB (S905)
+              - amlogic,meson-gxl-vpu # GXL (S905X, S905D)
+              - amlogic,meson-gxm-vpu # GXM (S912)
+          - const: amlogic,meson-gx-vpu
+      - enum:
+          - amlogic,meson-g12a-vpu # G12A (S905X2, S905Y2, S905D2)
+
+  reg:
+    maxItems: 2
+
+  reg-names:
+   items:
+     - const: vpu
+     - const: hhi
+
+  interrupts:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+    description: phandle to the associated power domain
+
+  port@0:
+    type: object
+    description:
+      A port node pointing to the CVBS VDAC port node.
+
+  port@1:
+    type: object
+    description:
+      A port node pointing to the HDMI-TX port node.
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - port@0
+  - port@1
+  - "#address-cells"
+  - "#size-cells"
+
+examples:
+  - |
+    vpu: vpu@d0100000 {
+        compatible = "amlogic,meson-gxbb-vpu", "amlogic,meson-gx-vpu";
+        reg = <0xd0100000 0x100000>, <0xc883c000 0x1000>;
+        reg-names = "vpu", "hhi";
+        interrupts = <3>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        /* CVBS VDAC output port */
+        port@0 {
+            reg = <0>;
+
+            cvbs_vdac_out: endpoint {
+                remote-endpoint = <&tv_connector_in>;
+            };
+        };
+
+        /* HDMI TX output port */
+        port@1 {
+            reg = <1>;
+
+            hdmi_tx_out: endpoint {
+                remote-endpoint = <&hdmi_tx_in>;
+            };
+        };
+    };