FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/iio/adc/at91_adc.txt

     * AT91's Analog to Digital Converter (ADC)
     
     Required properties:
       - compatible: Should be "atmel,<chip>-adc"
         <chip> can be "at91sam9260", "at91sam9g45" or "at91sam9x5"
       - reg: Should contain ADC registers location and length
       - interrupts: Should contain the IRQ line for the ADC
       - clock-names: tuple listing input clock names.
             Required elements: "adc_clk", "adc_op_clk".
      - clocks: phandles to input clocks.
      - atmel,adc-channels-used: Bitmask of the channels muxed and enabled for this
        device
      - atmel,adc-startup-time: Startup Time of the ADC in microseconds as
        defined in the datasheet
      - atmel,adc-vref: Reference voltage in millivolts for the conversions
      - atmel,adc-res: List of resolutions in bits supported by the ADC. List size
                       must be two at least.
      - atmel,adc-res-names: Contains one identifier string for each resolution
                             in atmel,adc-res property. "lowres" and "highres"
                             identifiers are required.
    
    Optional properties:
      - atmel,adc-use-external-triggers: Boolean to enable the external triggers
      - atmel,adc-use-res: String corresponding to an identifier from
                           atmel,adc-res-names property. If not specified, the highest
                           resolution will be used.
      - atmel,adc-sleep-mode: Boolean to enable sleep mode when no conversion
      - atmel,adc-sample-hold-time: Sample and Hold Time in microseconds
      - atmel,adc-ts-wires: Number of touchscreen wires. Should be 4 or 5. If this
                            value is set, then the adc driver will enable touchscreen
                            support.
        NOTE: when adc touchscreen is enabled, the adc hardware trigger will be
              disabled. Since touchscreen will occupy the trigger register.
      - atmel,adc-ts-pressure-threshold: a pressure threshold for touchscreen. It
                                         makes touch detection more precise.
    
    Optional trigger Nodes:
      - Required properties:
        * trigger-name: Name of the trigger exposed to the user
        * trigger-value: Value to put in the Trigger register
          to activate this trigger
      - Optional properties:
        * trigger-external: Is the trigger an external trigger?
    
    Examples:
    adc0: adc@fffb0000 {
            #address-cells = <1>;
            #size-cells = <0>;
            compatible = "atmel,at91sam9260-adc";
            reg = <0xfffb0000 0x100>;
            interrupts = <20 IRQ_TYPE_LEVEL_HIGH 0>;
            clocks = <&adc_clk>, <&adc_op_clk>;
            clock-names = "adc_clk", "adc_op_clk";
            atmel,adc-channels-used = <0xff>;
            atmel,adc-startup-time = <40>;
            atmel,adc-use-external-triggers;
            atmel,adc-vref = <3300>;
            atmel,adc-res = <8 10>;
            atmel,adc-res-names = "lowres", "highres";
            atmel,adc-use-res = "lowres";
    
            trigger0 {
                    trigger-name = "external-rising";
                    trigger-value = <0x1>;
                    trigger-external;
            };
            trigger1 {
                    trigger-name = "external-falling";
                    trigger-value = <0x2>;
                    trigger-external;
            };
    
            trigger2 {
                    trigger-name = "external-any";
                    trigger-value = <0x3>;
                    trigger-external;
            };
    
            trigger3 {
                    trigger-name = "continuous";
                    trigger-value = <0x6>;
            };
    };

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