| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 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 | |
| 7 | title: ADC that forms part of an ASPEED server management processor. |
| 8 | |
| 9 | maintainers: |
| 10 | - Billy Tsai <billy_tsai@aspeedtech.com> |
| 11 | |
| 12 | description: | |
| 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 | |
| 27 | properties: |
| 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 | |
| 65 | required: |
| 66 | - compatible |
| 67 | - reg |
| 68 | - clocks |
| 69 | - resets |
| 70 | - "#io-channel-cells" |
| 71 | |
| 72 | additionalProperties: false |
| 73 | |
| 74 | examples: |
| 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 | ... |