47be16b668
at91 adc offers the choice between two resolutions: low and high. The low and high resolution values depends on adc IP version, as many IP properties have been exposed through device tree, these settings have also been added to the dt bindings. Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
77 lines
2.5 KiB
Plaintext
77 lines
2.5 KiB
Plaintext
* AT91's Analog to Digital Converter (ADC)
|
|
|
|
Required properties:
|
|
- compatible: Should be "atmel,at91sam9260-adc"
|
|
- reg: Should contain ADC registers location and length
|
|
- interrupts: Should contain the IRQ line for the ADC
|
|
- atmel,adc-channel-base: Offset of the first channel data register
|
|
- atmel,adc-channels-used: Bitmask of the channels muxed and enable for this
|
|
device
|
|
- atmel,adc-drdy-mask: Mask of the DRDY interruption in the ADC
|
|
- atmel,adc-num-channels: Number of channels available in the ADC
|
|
- atmel,adc-startup-time: Startup Time of the ADC in microseconds as
|
|
defined in the datasheet
|
|
- atmel,adc-status-register: Offset of the Interrupt Status Register
|
|
- atmel,adc-trigger-register: Offset of the Trigger Register
|
|
- atmel,adc-vref: Reference voltage in millivolts for the conversions
|
|
- atmel,adc-res: List of resolution 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: Boolean to enable of 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.
|
|
|
|
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 {
|
|
compatible = "atmel,at91sam9260-adc";
|
|
reg = <0xfffb0000 0x100>;
|
|
interrupts = <20 4>;
|
|
atmel,adc-channel-base = <0x30>;
|
|
atmel,adc-channels-used = <0xff>;
|
|
atmel,adc-drdy-mask = <0x10000>;
|
|
atmel,adc-num-channels = <8>;
|
|
atmel,adc-startup-time = <40>;
|
|
atmel,adc-status-register = <0x1c>;
|
|
atmel,adc-trigger-register = <0x08>;
|
|
atmel,adc-use-external;
|
|
atmel,adc-vref = <3300>;
|
|
atmel,adc-res = <8 10>;
|
|
atmel,adc-res-names = "lowres", "highres";
|
|
atmel,adc-use-res = "lowres";
|
|
|
|
trigger@0 {
|
|
trigger-name = "external-rising";
|
|
trigger-value = <0x1>;
|
|
trigger-external;
|
|
};
|
|
trigger@1 {
|
|
trigger-name = "external-falling";
|
|
trigger-value = <0x2>;
|
|
trigger-external;
|
|
};
|
|
|
|
trigger@2 {
|
|
trigger-name = "external-any";
|
|
trigger-value = <0x3>;
|
|
trigger-external;
|
|
};
|
|
|
|
trigger@3 {
|
|
trigger-name = "continuous";
|
|
trigger-value = <0x6>;
|
|
};
|
|
};
|