ARM HDLCD
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This is a display controller found on several development platforms produced
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by ARM Ltd and in more modern of its' Fast Models. The HDLCD is an RGB
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streamer that reads the data from a framebuffer and sends it to a single
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digital encoder (DVI or HDMI).
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Required properties:
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- compatible: "arm,hdlcd"
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- reg: Physical base address and length of the controller's registers.
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- interrupts: One interrupt used by the display controller to notify the
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interrupt controller when any of the interrupt sources programmed in
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the interrupt mask register have activated.
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- clocks: A list of phandle + clock-specifier pairs, one for each
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entry in 'clock-names'.
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- clock-names: A list of clock names. For HDLCD it should contain:
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- "pxlclk" for the clock feeding the output PLL of the controller.
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Required sub-nodes:
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- port: The HDLCD connection to an encoder chip. The connection is modeled
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using the OF graph bindings specified in
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Documentation/devicetree/bindings/graph.txt.
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Optional properties:
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- memory-region: phandle to a node describing memory (see
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Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt) to be
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used for the framebuffer; if not present, the framebuffer may be located
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anywhere in memory.
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Example:
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/ {
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...
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hdlcd@2b000000 {
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compatible = "arm,hdlcd";
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reg = <0 0x2b000000 0 0x1000>;
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interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&oscclk5>;
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clock-names = "pxlclk";
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port {
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hdlcd_output: endpoint@0 {
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remote-endpoint = <&hdmi_enc_input>;
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};
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};
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};
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/* HDMI encoder on I2C bus */
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i2c@7ffa0000 {
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....
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hdmi-transmitter@70 {
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compatible = ".....";
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reg = <0x70>;
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port@0 {
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hdmi_enc_input: endpoint {
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remote-endpoint = <&hdlcd_output>;
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};
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hdmi_enc_output: endpoint {
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remote-endpoint = <&hdmi_1_port>;
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};
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};
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};
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};
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hdmi1: connector@1 {
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compatible = "hdmi-connector";
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type = "a";
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port {
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hdmi_1_port: endpoint {
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remote-endpoint = <&hdmi_enc_output>;
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};
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};
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};
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...
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};
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