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