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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/Documentation/devicetree/bindings/iio/adc/aspeed,ast2600-adc.yaml
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)

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%YAML 1.2

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---

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$id: http://devicetree.org/schemas/iio/adc/aspeed,ast2600-adc.yaml#

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$schema: http://devicetree.org/meta-schemas/core.yaml#

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title: ADC that forms part of an ASPEED server management processor.

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maintainers:

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  - Billy Tsai <billy_tsai@aspeedtech.com>

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description: |

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  • 10-bits resolution for 16 voltage channels.

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  • The device split into two individual engine and each contains 8 voltage

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  channels.

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  • Channel scanning can be non-continuous.

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  • Programmable ADC clock frequency.

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  • Programmable upper and lower threshold for each channels.

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  • Interrupt when larger or less than threshold for each channels.

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  • Support hysteresis for each channels.

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  • Built-in a compensating method.

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  • Built-in a register to trim internal reference voltage.

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  • Internal or External reference voltage.

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  • Support 2 Internal reference voltage 1.2v or 2.5v.

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  • Integrate dividing circuit for battery sensing.

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properties:

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  compatible:

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    enum:

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      - aspeed,ast2600-adc0

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      - aspeed,ast2600-adc1

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    description:

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      Their trimming data, which is used to calibrate internal reference volage,

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      locates in different address of OTP.

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  reg:

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    maxItems: 1

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  clocks:

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    maxItems: 1

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    description:

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      Input clock used to derive the sample clock. Expected to be the

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      SoC's APB clock.

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  resets:

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    maxItems: 1

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  "#io-channel-cells":

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    const: 1

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  vref-supply:

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    description:

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      The external regulator supply ADC reference voltage.

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  aspeed,int-vref-microvolt:

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    enum: [1200000, 2500000]

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    description:

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      ADC internal reference voltage in microvolts.

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  aspeed,battery-sensing:

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    type: boolean

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    description:

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      Inform the driver that last channel will be used to sensor battery.

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required:

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  - compatible

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  - reg

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  - clocks

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  - resets

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  - "#io-channel-cells"

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additionalProperties: false

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examples:

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  - |

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    #include <dt-bindings/clock/ast2600-clock.h>

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    adc0: adc@1e6e9000 {

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        compatible = "aspeed,ast2600-adc0";

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        reg = <0x1e6e9000 0x100>;

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        clocks = <&syscon ASPEED_CLK_APB2>;

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        resets = <&syscon ASPEED_RESET_ADC>;

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        #io-channel-cells = <1>;

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        aspeed,int-vref-microvolt = <2500000>;

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    };

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    adc1: adc@1e6e9100 {

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        compatible = "aspeed,ast2600-adc1";

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        reg = <0x1e6e9100 0x100>;

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        clocks = <&syscon ASPEED_CLK_APB2>;

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        resets = <&syscon ASPEED_RESET_ADC>;

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        #io-channel-cells = <1>;

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        aspeed,int-vref-microvolt = <2500000>;

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    };

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...

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