Documentation/devicetree/bindings/arm/atmel-adc.txt

   1 * AT91's Analog to Digital Converter (ADC)
   2
   3 Required properties:
   4   - compatible: Should be "atmel,at91sam9260-adc"
   5   - reg: Should contain ADC registers location and length
   6   - interrupts: Should contain the IRQ line for the ADC
   7   - atmel,adc-channel-base: Offset of the first channel data register
   8   - atmel,adc-channels-used: Bitmask of the channels muxed and enable for this
   9     device
  10   - atmel,adc-drdy-mask: Mask of the DRDY interruption in the ADC
  11   - atmel,adc-num-channels: Number of channels available in the ADC
  12   - atmel,adc-startup-time: Startup Time of the ADC in microseconds as
  13     defined in the datasheet
  14   - atmel,adc-status-register: Offset of the Interrupt Status Register
  15   - atmel,adc-trigger-register: Offset of the Trigger Register
  16   - atmel,adc-vref: Reference voltage in millivolts for the conversions
  17
  18 Optional properties:
  19   - atmel,adc-use-external: Boolean to enable of external triggers
  20
  21 Optional trigger Nodes:
  22   - Required properties:
  23     * trigger-name: Name of the trigger exposed to the user
  24     * trigger-value: Value to put in the Trigger register
  25       to activate this trigger
  26   - Optional properties:
  27     * trigger-external: Is the trigger an external trigger?
  28
  29 Examples:
  30 adc0: adc@fffb0000 {
  31         compatible = "atmel,at91sam9260-adc";
  32         reg = <0xfffb0000 0x100>;
  33         interrupts = <20 4>;
  34         atmel,adc-channel-base = <0x30>;
  35         atmel,adc-channels-used = <0xff>;
  36         atmel,adc-drdy-mask = <0x10000>;
  37         atmel,adc-num-channels = <8>;
  38         atmel,adc-startup-time = <40>;
  39         atmel,adc-status-register = <0x1c>;
  40         atmel,adc-trigger-register = <0x08>;
  41         atmel,adc-use-external;
  42         atmel,adc-vref = <3300>;
  43
  44         trigger@0 {
  45                 trigger-name = "external-rising";
  46                 trigger-value = <0x1>;
  47                 trigger-external;
  48         };
  49         trigger@1 {
  50                 trigger-name = "external-falling";
  51                 trigger-value = <0x2>;
  52                 trigger-external;
  53         };
  54
  55         trigger@2 {
  56                 trigger-name = "external-any";
  57                 trigger-value = <0x3>;
  58                 trigger-external;
  59         };
  60
  61         trigger@3 {
  62                 trigger-name = "continuous";
  63                 trigger-value = <0x6>;
  64         };
  65 };