Documentation/devicetree/bindings/display/arm,hdlcd.txt

   1 ARM HDLCD
   2
   3 This is a display controller found on several development platforms produced
   4 by ARM Ltd and in more modern of its' Fast Models. The HDLCD is an RGB
   5 streamer that reads the data from a framebuffer and sends it to a single
   6 digital encoder (DVI or HDMI).
   7
   8 Required properties:
   9   - compatible: "arm,hdlcd"
  10   - reg: Physical base address and length of the controller's registers.
  11   - interrupts: One interrupt used by the display controller to notify the
  12     interrupt controller when any of the interrupt sources programmed in
  13     the interrupt mask register have activated.
  14   - clocks: A list of phandle + clock-specifier pairs, one for each
  15     entry in 'clock-names'.
  16   - clock-names: A list of clock names. For HDLCD it should contain:
  17       - "pxlclk" for the clock feeding the output PLL of the controller.
  18
  19 Required sub-nodes:
  20   - port: The HDLCD connection to an encoder chip. The connection is modeled
  21     using the OF graph bindings specified in
  22     Documentation/devicetree/bindings/graph.txt.
  23
  24 Optional properties:
  25   - memory-region: phandle to a node describing memory (see
  26     Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt) to be
  27     used for the framebuffer; if not present, the framebuffer may be located
  28     anywhere in memory.
  29
  30
  31 Example:
  32
  33 / {
  34         ...
  35
  36         hdlcd@2b000000 {
  37                 compatible = "arm,hdlcd";
  38                 reg = <0 0x2b000000 0 0x1000>;
  39                 interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
  40                 clocks = <&oscclk5>;
  41                 clock-names = "pxlclk";
  42                 port {
  43                         hdlcd_output: endpoint@0 {
  44                                 remote-endpoint = <&hdmi_enc_input>;
  45                         };
  46                 };
  47         };
  48
  49         /* HDMI encoder on I2C bus */
  50         i2c@7ffa0000 {
  51                 ....
  52                 hdmi-transmitter@70 {
  53                         compatible = ".....";
  54                         reg = <0x70>;
  55                         port@0 {
  56                                 hdmi_enc_input: endpoint {
  57                                         remote-endpoint = <&hdlcd_output>;
  58                                 };
  59
  60                                 hdmi_enc_output: endpoint {
  61                                         remote-endpoint = <&hdmi_1_port>;
  62                                 };
  63                         };
  64                 };
  65
  66         };
  67
  68         hdmi1: connector@1 {
  69                 compatible = "hdmi-connector";
  70                 type = "a";
  71                 port {
  72                         hdmi_1_port: endpoint {
  73                                 remote-endpoint = <&hdmi_enc_output>;
  74                         };
  75                 };
  76         };
  77
  78         ...
  79 };