1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-C 1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 %YAML 1.2 2 %YAML 1.2
3 --- 3 ---
4 $id: http://devicetree.org/schemas/iio/resolve 4 $id: http://devicetree.org/schemas/iio/resolver/adi,ad2s90.yaml#
5 $schema: http://devicetree.org/meta-schemas/co 5 $schema: http://devicetree.org/meta-schemas/core.yaml#
6 6
7 title: Analog Devices AD2S90 Resolver-to-Digit 7 title: Analog Devices AD2S90 Resolver-to-Digital Converter
8 8
9 maintainers: 9 maintainers:
10 - Matheus Tavares <matheus.bernardino@usp.br> 10 - Matheus Tavares <matheus.bernardino@usp.br>
11 11
12 description: | 12 description: |
13 Datasheet: https://www.analog.com/en/product 13 Datasheet: https://www.analog.com/en/products/ad2s90.html
14 14
15 properties: 15 properties:
16 compatible: 16 compatible:
17 const: adi,ad2s90 17 const: adi,ad2s90
18 18
19 reg: 19 reg:
20 maxItems: 1 20 maxItems: 1
21 21
22 spi-max-frequency: 22 spi-max-frequency:
23 maximum: 830000 23 maximum: 830000
24 description: | 24 description: |
25 Chip's max frequency, as specified in it 25 Chip's max frequency, as specified in its datasheet, is 2Mhz. But a 600ns
26 delay is expected between the applicatio 26 delay is expected between the application of a logic LO to CS and the
27 application of SCLK, as also specified. 27 application of SCLK, as also specified. And since the delay is not
28 implemented in the spi code, to satisfy 28 implemented in the spi code, to satisfy it, SCLK's period should be at
29 most 2 * 600ns, so the max frequency sho 29 most 2 * 600ns, so the max frequency should be 1 / (2 * 6e-7), which gives
30 roughly 830000Hz. 30 roughly 830000Hz.
31 31
32 spi-cpol: true 32 spi-cpol: true
33 33
34 spi-cpha: true 34 spi-cpha: true
35 35
36 required: 36 required:
37 - compatible 37 - compatible
38 - reg 38 - reg
39 39
40 dependencies: 40 dependencies:
41 spi-cpol: [ spi-cpha ] 41 spi-cpol: [ spi-cpha ]
42 spi-cpha: [ spi-cpol ] 42 spi-cpha: [ spi-cpol ]
43 43
44 allOf: 44 allOf:
45 - $ref: /schemas/spi/spi-peripheral-props.ya 45 - $ref: /schemas/spi/spi-peripheral-props.yaml#
46 46
47 unevaluatedProperties: false 47 unevaluatedProperties: false
48 48
49 examples: 49 examples:
50 - | 50 - |
51 spi { 51 spi {
52 #address-cells = <1>; 52 #address-cells = <1>;
53 #size-cells = <0>; 53 #size-cells = <0>;
54 54
55 resolver@0 { 55 resolver@0 {
56 compatible = "adi,ad2s90"; 56 compatible = "adi,ad2s90";
57 reg = <0>; 57 reg = <0>;
58 spi-max-frequency = <830000>; 58 spi-max-frequency = <830000>;
59 spi-cpol; 59 spi-cpol;
60 spi-cpha; 60 spi-cpha;
61 }; 61 };
62 }; 62 };
63 ... 63 ...
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