drm: sun4i: Add DT bindings documentation

The display pipeline of the Allwinner A10 is involving several loosely
coupled components.

Add a documentation for the bindings.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

diff --git a/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
new file mode 100644 (file)
index 0000000..df8f4ae
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+++ b/Documentation/devicetree/bindings/display/sunxi/sun4i-drm.txt
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+Allwinner A10 Display Pipeline
+==============================
+
+The Allwinner A10 Display pipeline is composed of several components
+that are going to be documented below:
+
+TV Encoder
+----------
+
+The TV Encoder supports the composite and VGA output. It is one end of
+the pipeline.
+
+Required properties:
+ - compatible: value should be "allwinner,sun4i-a10-tv-encoder".
+ - reg: base address and size of memory-mapped region
+ - clocks: the clocks driving the TV encoder
+ - resets: phandle to the reset controller driving the encoder
+
+- ports: A ports node with endpoint definitions as defined in
+  Documentation/devicetree/bindings/media/video-interfaces.txt. The
+  first port should be the input endpoint.
+
+TCON
+----
+
+The TCON acts as a timing controller for RGB, LVDS and TV interfaces.
+
+Required properties:
+ - compatible: value should be "allwinner,sun5i-a13-tcon".
+ - reg: base address and size of memory-mapped region
+ - interrupts: interrupt associated to this IP
+ - clocks: phandles to the clocks feeding the TCON. Three are needed:
+   - 'ahb': the interface clocks
+   - 'tcon-ch0': The clock driving the TCON channel 0
+   - 'tcon-ch1': The clock driving the TCON channel 1
+ - resets: phandles to the reset controllers driving the encoder
+   - "lcd": the reset line for the TCON channel 0
+
+ - clock-names: the clock names mentioned above
+ - reset-names: the reset names mentioned above
+ - clock-output-names: Name of the pixel clock created
+
+- ports: A ports node with endpoint definitions as defined in
+  Documentation/devicetree/bindings/media/video-interfaces.txt. The
+  first port should be the input endpoint, the second one the output
+
+  The output should have two endpoints. The first is the block
+  connected to the TCON channel 0 (usually a panel or a bridge), the
+  second the block connected to the TCON channel 1 (usually the TV
+  encoder)
+
+
+Display Engine Backend
+----------------------
+
+The display engine backend exposes layers and sprites to the
+system.
+
+Required properties:
+  - compatible: value must be one of:
+    * allwinner,sun5i-a13-display-backend
+  - reg: base address and size of the memory-mapped region.
+  - clocks: phandles to the clocks feeding the frontend and backend
+    * ahb: the backend interface clock
+    * mod: the backend module clock
+    * ram: the backend DRAM clock
+  - clock-names: the clock names mentioned above
+  - resets: phandles to the reset controllers driving the backend
+
+- ports: A ports node with endpoint definitions as defined in
+  Documentation/devicetree/bindings/media/video-interfaces.txt. The
+  first port should be the input endpoints, the second one the output
+
+Display Engine Frontend
+-----------------------
+
+The display engine frontend does formats conversion, scaling,
+deinterlacing and color space conversion.
+
+Required properties:
+  - compatible: value must be one of:
+    * allwinner,sun5i-a13-display-frontend
+  - reg: base address and size of the memory-mapped region.
+  - interrupts: interrupt associated to this IP
+  - clocks: phandles to the clocks feeding the frontend and backend
+    * ahb: the backend interface clock
+    * mod: the backend module clock
+    * ram: the backend DRAM clock
+  - clock-names: the clock names mentioned above
+  - resets: phandles to the reset controllers driving the backend
+
+- ports: A ports node with endpoint definitions as defined in
+  Documentation/devicetree/bindings/media/video-interfaces.txt. The
+  first port should be the input endpoints, the second one the outputs
+
+
+Display Engine Pipeline
+-----------------------
+
+The display engine pipeline (and its entry point, since it can be
+either directly the backend or the frontend) is represented as an
+extra node.
+
+Required properties:
+  - compatible: value must be one of:
+    * allwinner,sun5i-a13-display-engine
+
+  - allwinner,pipelines: list of phandle to the display engine
+    frontends available.
+
+Example:
+
+panel: panel {
+       compatible = "olimex,lcd-olinuxino-43-ts";
+       #address-cells = <1>;
+       #size-cells = <0>;
+
+       port {
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               panel_input: endpoint {
+                       remote-endpoint = <&tcon0_out_panel>;
+               };
+       };
+};
+
+tve0: tv-encoder@01c0a000 {
+       compatible = "allwinner,sun4i-a10-tv-encoder";
+       reg = <0x01c0a000 0x1000>;
+       clocks = <&ahb_gates 34>;
+       resets = <&tcon_ch0_clk 0>;
+
+       port {
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               tve0_in_tcon0: endpoint@0 {
+                       reg = <0>;
+                       remote-endpoint = <&tcon0_out_tve0>;
+               };
+       };
+};
+
+tcon0: lcd-controller@1c0c000 {
+       compatible = "allwinner,sun5i-a13-tcon";
+       reg = <0x01c0c000 0x1000>;
+       interrupts = <44>;
+       resets = <&tcon_ch0_clk 1>;
+       reset-names = "lcd";
+       clocks = <&ahb_gates 36>,
+                <&tcon_ch0_clk>,
+                <&tcon_ch1_clk>;
+       clock-names = "ahb",
+                     "tcon-ch0",
+                     "tcon-ch1";
+       clock-output-names = "tcon-pixel-clock";
+
+       ports {
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               tcon0_in: port@0 {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+                       reg = <0>;
+
+                       tcon0_in_be0: endpoint@0 {
+                               reg = <0>;
+                               remote-endpoint = <&be0_out_tcon0>;
+                       };
+               };
+
+               tcon0_out: port@1 {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+                       reg = <1>;
+
+                       tcon0_out_panel: endpoint@0 {
+                               reg = <0>;
+                               remote-endpoint = <&panel_input>;
+                       };
+
+                       tcon0_out_tve0: endpoint@1 {
+                               reg = <1>;
+                               remote-endpoint = <&tve0_in_tcon0>;
+                       };
+               };
+       };
+};
+
+fe0: display-frontend@1e00000 {
+       compatible = "allwinner,sun5i-a13-display-frontend";
+       reg = <0x01e00000 0x20000>;
+       interrupts = <47>;
+       clocks = <&ahb_gates 46>, <&de_fe_clk>,
+                <&dram_gates 25>;
+       clock-names = "ahb", "mod",
+                     "ram";
+       resets = <&de_fe_clk>;
+
+       ports {
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               fe0_out: port@1 {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+                       reg = <1>;
+
+                       fe0_out_be0: endpoint {
+                               remote-endpoint = <&be0_in_fe0>;
+                       };
+               };
+       };
+};
+
+be0: display-backend@1e60000 {
+       compatible = "allwinner,sun5i-a13-display-backend";
+       reg = <0x01e60000 0x10000>;
+       clocks = <&ahb_gates 44>, <&de_be_clk>,
+                <&dram_gates 26>;
+       clock-names = "ahb", "mod",
+                     "ram";
+       resets = <&de_be_clk>;
+
+       ports {
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               be0_in: port@0 {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+                       reg = <0>;
+
+                       be0_in_fe0: endpoint@0 {
+                               reg = <0>;
+                               remote-endpoint = <&fe0_out_be0>;
+                       };
+               };
+
+               be0_out: port@1 {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+                       reg = <1>;
+
+                       be0_out_tcon0: endpoint@0 {
+                               reg = <0>;
+                               remote-endpoint = <&tcon0_in_be0>;
+                       };
+               };
+       };
+};
+
+display-engine {
+       compatible = "allwinner,sun5i-a13-display-engine";
+       allwinner,pipelines = <&fe0>;
+};