xref: /linux/Documentation/devicetree/bindings/iio/adc/aspeed,ast2600-adc.yaml (revision fd7d598270724cc787982ea48bbe17ad383a8b7f) 
1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/iio/adc/aspeed,ast2600-adc.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: ADC that forms part of an ASPEED server management processor.
8
9maintainers:
10  - Billy Tsai <billy_tsai@aspeedtech.com>
11
12description: |
13  • 10-bits resolution for 16 voltage channels.
14  • The device split into two individual engine and each contains 8 voltage
15  channels.
16  • Channel scanning can be non-continuous.
17  • Programmable ADC clock frequency.
18  • Programmable upper and lower threshold for each channels.
19  • Interrupt when larger or less than threshold for each channels.
20  • Support hysteresis for each channels.
21  • Built-in a compensating method.
22  • Built-in a register to trim internal reference voltage.
23  • Internal or External reference voltage.
24  • Support 2 Internal reference voltage 1.2v or 2.5v.
25  • Integrate dividing circuit for battery sensing.
26
27properties:
28  compatible:
29    enum:
30      - aspeed,ast2600-adc0
31      - aspeed,ast2600-adc1
32    description:
33      Their trimming data, which is used to calibrate internal reference volage,
34      locates in different address of OTP.
35
36  reg:
37    maxItems: 1
38
39  clocks:
40    maxItems: 1
41    description:
42      Input clock used to derive the sample clock. Expected to be the
43      SoC's APB clock.
44
45  resets:
46    maxItems: 1
47
48  "#io-channel-cells":
49    const: 1
50
51  vref-supply:
52    description:
53      The external regulator supply ADC reference voltage.
54
55  aspeed,int-vref-microvolt:
56    enum: [1200000, 2500000]
57    description:
58      ADC internal reference voltage in microvolts.
59
60  aspeed,battery-sensing:
61    type: boolean
62    description:
63      Inform the driver that last channel will be used to sensor battery.
64
65required:
66  - compatible
67  - reg
68  - clocks
69  - resets
70  - "#io-channel-cells"
71
72additionalProperties: false
73
74examples:
75  - |
76    #include <dt-bindings/clock/ast2600-clock.h>
77    adc0: adc@1e6e9000 {
78        compatible = "aspeed,ast2600-adc0";
79        reg = <0x1e6e9000 0x100>;
80        clocks = <&syscon ASPEED_CLK_APB2>;
81        resets = <&syscon ASPEED_RESET_ADC>;
82        #io-channel-cells = <1>;
83        aspeed,int-vref-microvolt = <2500000>;
84    };
85    adc1: adc@1e6e9100 {
86        compatible = "aspeed,ast2600-adc1";
87        reg = <0x1e6e9100 0x100>;
88        clocks = <&syscon ASPEED_CLK_APB2>;
89        resets = <&syscon ASPEED_RESET_ADC>;
90        #io-channel-cells = <1>;
91        aspeed,int-vref-microvolt = <2500000>;
92    };
93...
94