mirror of
https://github.com/torvalds/linux.git
synced 2024-12-20 01:52:13 +00:00
6e33a125df
Document support for AD7606 Analog to Digital Converter. Signed-off-by: Stefan Popa <stefan.popa@analog.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
66 lines
2.6 KiB
Plaintext
66 lines
2.6 KiB
Plaintext
Analog Devices AD7606 Simultaneous Sampling ADC
|
|
|
|
Required properties for the AD7606:
|
|
|
|
- compatible: Must be one of
|
|
* "adi,ad7605-4"
|
|
* "adi,ad7606-8"
|
|
* "adi,ad7606-6"
|
|
* "adi,ad7606-4"
|
|
- reg: SPI chip select number for the device
|
|
- spi-max-frequency: Max SPI frequency to use
|
|
see: Documentation/devicetree/bindings/spi/spi-bus.txt
|
|
- spi-cpha: See Documentation/devicetree/bindings/spi/spi-bus.txt
|
|
- avcc-supply: phandle to the Avcc power supply
|
|
- interrupts: IRQ line for the ADC
|
|
see: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
|
|
- adi,conversion-start-gpios: must be the device tree identifier of the CONVST pin.
|
|
This logic input is used to initiate conversions on the analog
|
|
input channels. As the line is active high, it should be marked
|
|
GPIO_ACTIVE_HIGH.
|
|
|
|
Optional properties:
|
|
|
|
- reset-gpios: must be the device tree identifier of the RESET pin. If specified,
|
|
it will be asserted during driver probe. As the line is active high,
|
|
it should be marked GPIO_ACTIVE_HIGH.
|
|
- standby-gpios: must be the device tree identifier of the STBY pin. This pin is used
|
|
to place the AD7606 into one of two power-down modes, Standby mode or
|
|
Shutdown mode. As the line is active low, it should be marked
|
|
GPIO_ACTIVE_LOW.
|
|
- adi,first-data-gpios: must be the device tree identifier of the FRSTDATA pin.
|
|
The FRSTDATA output indicates when the first channel, V1, is
|
|
being read back on either the parallel, byte or serial interface.
|
|
As the line is active high, it should be marked GPIO_ACTIVE_HIGH.
|
|
- adi,range-gpios: must be the device tree identifier of the RANGE pin. The polarity on
|
|
this pin determines the input range of the analog input channels. If
|
|
this pin is tied to a logic high, the analog input range is ±10V for
|
|
all channels. If this pin is tied to a logic low, the analog input range
|
|
is ±5V for all channels. As the line is active high, it should be marked
|
|
GPIO_ACTIVE_HIGH.
|
|
- adi,oversampling-ratio-gpios: must be the device tree identifier of the over-sampling
|
|
mode pins. As the line is active high, it should be marked
|
|
GPIO_ACTIVE_HIGH.
|
|
|
|
Example:
|
|
|
|
adc@0 {
|
|
compatible = "adi,ad7606-8";
|
|
reg = <0>;
|
|
spi-max-frequency = <1000000>;
|
|
spi-cpol;
|
|
|
|
avcc-supply = <&adc_vref>;
|
|
|
|
interrupts = <25 IRQ_TYPE_EDGE_FALLING>;
|
|
interrupt-parent = <&gpio>;
|
|
|
|
adi,conversion-start-gpios = <&gpio 17 GPIO_ACTIVE_HIGH>;
|
|
reset-gpios = <&gpio 27 GPIO_ACTIVE_HIGH>;
|
|
adi,first-data-gpios = <&gpio 22 GPIO_ACTIVE_HIGH>;
|
|
adi,oversampling-ratio-gpios = <&gpio 18 GPIO_ACTIVE_HIGH
|
|
&gpio 23 GPIO_ACTIVE_HIGH
|
|
&gpio 26 GPIO_ACTIVE_HIGH>;
|
|
standby-gpios = <&gpio 24 GPIO_ACTIVE_LOW>;
|
|
};
|