1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 %YAML 1.2
3 ---
4 $id: http://devicetree.org/schemas/iio/amplifiers/adi,hmc425a.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6
7 title: Analog Devices HMC425A and similar Digital Step Attenuators
8
9 maintainers:
10 - Michael Hennerich <michael.hennerich@analog.com>
11
12 description: |
13 Digital Step Attenuator IIO devices with gpio interface.
14 Offer various frequency and attenuation ranges.
15 ADRF5750 2 dB LSB, 4-Bit, Silicon Digital Attenuator, 10 MHz to 60 GHz
16 https://www.analog.com/media/en/technical-documentation/data-sheets/adrf5740.pdf
17
18 HMC425A 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL POSITIVE CONTROL ATTENUATOR, 2.2 - 8.0 GHz
19 https://www.analog.com/media/en/technical-documentation/data-sheets/hmc425A.pdf
20
21 HMC540S 1 dB LSB Silicon MMIC 4-Bit Digital Positive Control Attenuator, 0.1 - 8 GHz
22 https://www.analog.com/media/en/technical-documentation/data-sheets/hmc540s.pdf
23
24 LTC6373 is a 3-Bit precision instrumentation amplifier with fully differential outputs
25 https://www.analog.com/media/en/technical-documentation/data-sheets/ltc6373.pdf
26
27 properties:
28 compatible:
29 enum:
30 - adi,adrf5740
31 - adi,hmc425a
32 - adi,hmc540s
33 - adi,ltc6373
34
35 vcc-supply: true
36
37 ctrl-gpios:
38 description:
39 Must contain an array of GPIO specifiers, referring to the GPIO pins
40 connected to the control pins.
41 ADRF5740 - 4 GPIO connected to D2-D5
42 HMC540S - 4 GPIO connected to V1-V4
43 HMC425A - 6 GPIO connected to V1-V6
44 LTC6373 - 3 GPIO connected to A0-A2
45 minItems: 1
46 maxItems: 6
47
48 allOf:
49 - if:
50 properties:
51 compatible:
52 contains:
53 const: adi,hmc425a
54 then:
55 properties:
56 ctrl-gpios:
57 minItems: 6
58 maxItems: 6
59 - if:
60 properties:
61 compatible:
62 contains:
63 anyOf:
64 - const: adi,adrf5740
65 - const: adi,hmc540s
66 then:
67 properties:
68 ctrl-gpios:
69 minItems: 4
70 maxItems: 4
71 - if:
72 properties:
73 compatible:
74 contains:
75 const: adi,ltc6373
76 then:
77 properties:
78 ctrl-gpios:
79 minItems: 3
80 maxItems: 3
81
82 required:
83 - compatible
84 - ctrl-gpios
85
86 additionalProperties: false
87
88 examples:
89 - |
90 #include <dt-bindings/gpio/gpio.h>
91 gpio_hmc425a: hmc425a {
92 compatible = "adi,hmc425a";
93 ctrl-gpios = <&gpio 40 GPIO_ACTIVE_HIGH>,
94 <&gpio 39 GPIO_ACTIVE_HIGH>,
95 <&gpio 38 GPIO_ACTIVE_HIGH>,
96 <&gpio 37 GPIO_ACTIVE_HIGH>,
97 <&gpio 36 GPIO_ACTIVE_HIGH>,
98 <&gpio 35 GPIO_ACTIVE_HIGH>;
99 vcc-supply = <&foo>;
100 };
101 ...
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