ADRF6780

ADRF6780 5.9 GHz to 23.6 GHz, Wideband, Microwave Upconverter Linux Driver.

Supported Devices

Evaluation Boards

Description

This is a Linux industrial I/O (Linux Industrial I/O Subsystem) subsystem driver, targeting serial interface Microwave converters. The industrial I/O subsystem provides a unified framework for drivers for many different types of converters and sensors using a number of different physical interfaces (i2c, spi, etc). See Linux Industrial I/O Subsystem for more information.

Source Code

Status

Source

Mainlined?

git

WIP

Files

Function

File

driver

drivers/iio/frequency/adrf6780.c

Documentation

Documentation/ABI/testing/sysfs-bus-iio

Unlike PCI or USB devices, SPI devices are not enumerated at the hardware level. Instead, the software must know which devices are connected on each SPI bus segment, and what slave selects these devices are using. For this reason, the kernel code must instantiate SPI devices explicitly. The most common method is to declare the SPI devices by bus number.

This method is appropriate when the SPI bus is a system bus, as in many embedded systems, wherein each SPI bus has a number which is known in advance. It is thus possible to pre-declare the SPI devices that inhabit this bus. This is done with an array of struct spi_board_info, which is registered by calling spi_register_board_info().

For more information see: Overview of Linux kernel SPI support

properties

compatible:

  • enum:

  • adi,adrf6780

reg:

  • maxItems: 1

spi-max-frequency:

  • minimum: 1000000

clocks:

  • description: Definition of the external clock (see clock/clock-bindings.txt)

  • minItems: 1

clock-names:

  • description: Must be lo_in

  • maxItems: 1

clock-output-names:

  • maxItems: 1

adi,parity-en:

  • description: Enable Parity for Write execution.

  • type: boolean

adi,vga-buff-en:

  • description: VGA Buffer Enable.

  • type: boolean

adi,det-en:

  • description: Detector Enable.

  • type: boolean

adi,lo-buff-en:

  • description: LO Buffer Enable.

  • type: boolean

adi,if-mode-en:

  • description: IF Mode Enable.

  • type: boolean

adi,iq-mode-en:

  • description: IQ Mode Enable.

  • type: boolean

adi,lo-x2-en:

  • description: LO x2 Enable.

  • type: boolean

adi,lo-ppf-en:

  • description: LO x1 Enable.

  • type: boolean

adi,lo-en:

  • description: LO Enable.

  • type: boolean

adi,uc-bias-en:

  • description: UC Bias Enable.

  • type: boolean

adi,lo-sideband:

  • description: Switch to the Other LO Sideband.

  • type: boolean

adi,vdet-out-en:

  • description: VDET Output Select Enable.

  • type: boolean

‘#address-cells’:

  • const: 1

‘#size-cells’:

  • const: 0

‘#clock-cells’:

  • const: 0

required:

  • compatible

  • reg

  • clocks

  • clock-names

Example

spi {
      spi {
      #address-cells = <1>;
      #size-cells = <0>;
      adrf6780@0{
        compatible = "adi,adrf6780";
        reg = <0>;
        spi-max-frequency = <1000000>;
        clocks = <&adrf6780_lo>;
        clock-names = "lo_in";
        adi,parity-en;
      };
    };

Adding Linux driver support

Configure kernel with make menuconfig (alternatively use make xconfig or make qconfig)

Note

The ADRF6780 Driver depends on CONFIG_SPI

Linux Kernel Configuration
    Device Drivers  --->
        <*>     Industrial I/O support --->
            --- Industrial I/O support
                Frequency  --->
                    <*> Analog Devices ADRF6780 Microwave Upconverter

Hardware configuration

Each and every IIO device, typically a hardware chip, has a device folder under /sys/bus/iio/devices/iio:deviceX. Where X is the IIO index of the device. Under every of these directory folders reside a set of files, depending on the characteristics and features of the hardware device in question. These files are consistently generalized and documented in the IIO ABI documentation. In order to determine which IIO deviceX corresponds to which hardware device, the user can read the name file /sys/bus/iio/devices/iio:deviceX/name. In case the sequence in which the iio device drivers are loaded/registered is constant, the numbering is constant and may be known in advance.

root:/> cd /sys/bus/iio/devices/
root:/sys/bus/iio/devices> ls
iio:device0
root:/sys/bus/iio/devices> iio:device0

root:/> ls -l
-r--r--r-- 1 root root 4096 May  6 12:20 dev
-r--r--r-- 1 root root 4096 May  6 12:20 name
-rw-r--r-- 1 root root 4096 May  6 13:01 out_voltage0_raw
-rw-r--r-- 1 root root 4096 May  6 13:01 out_voltage0_scale
-rw-r--r-- 1 root root 4096 May  6 13:01 out_altvoltage0_i_phase
-rw-r--r-- 1 root root 4096 May  6 13:01 out_altvoltage0_q_phase
lrwxrwxrwx 1 root root    0 May  6 12:20 subsystem -> ../../../../../../../../bus/iio
-rw-r--r-- 1 root root 4096 May  6 12:20 uevent

Show device name

root:/> cd /sys/bus/iio/devices/iio\:device0/
root:/> cat name
adrf6780

Set ChannelY Raw value

/sys/bus/iio/devices/iio:deviceX/out_voltageY_raw

ADC raw value. If shared across all channels, <type>_offset is used.

root:/> cat out_voltage0_raw
0

Set ChannelY Scale value

/sys/bus/iio/devices/iio:deviceX/out_voltageY_scale

RDAC Linearize. If shared across all channels, <type>_offset is used.

root:/> cat out_voltage0_scale
0

root:/> echo 1 > out_voltage0_scale
root:/> cat out_voltage0_scale
1

Set ChannelY Phase value

/sys/bus/iio/devices/iio:deviceX/out_altvoltageY_Z_phase

Phase value. If shared across all channels, <type>_phase is used.

root:/> cat out_altvoltage0_i_phase
0

root:/> echo 1 > out_altvoltage0_i_phase
root:/> cat out_altvoltage0_phase
1

More Information