xref: /kernel/linux/linux-6.6/Documentation/devicetree/bindings/iio/adc/aspeed,ast2600-adc.yaml

# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/iio/adc/aspeed,ast2600-adc.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

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

maintainers:
  - Billy Tsai <billy_tsai@aspeedtech.com>

description: |
  • 10-bits resolution for 16 voltage channels.
  • The device split into two individual engine and each contains 8 voltage
  channels.
  • Channel scanning can be non-continuous.
  • Programmable ADC clock frequency.
  • Programmable upper and lower threshold for each channels.
  • Interrupt when larger or less than threshold for each channels.
  • Support hysteresis for each channels.
  • Built-in a compensating method.
  • Built-in a register to trim internal reference voltage.
  • Internal or External reference voltage.
  • Support 2 Internal reference voltage 1.2v or 2.5v.
  • Integrate dividing circuit for battery sensing.

properties:
  compatible:
    enum:
      - aspeed,ast2600-adc0
      - aspeed,ast2600-adc1
    description:
      Their trimming data, which is used to calibrate internal reference volage,
      locates in different address of OTP.

  reg:
    maxItems: 1

  clocks:
    maxItems: 1
    description:
      Input clock used to derive the sample clock. Expected to be the
      SoC's APB clock.

  resets:
    maxItems: 1

  "#io-channel-cells":
    const: 1

  vref-supply:
    description:
      The external regulator supply ADC reference voltage.

  aspeed,int-vref-microvolt:
    enum: [1200000, 2500000]
    description:
      ADC internal reference voltage in microvolts.

  aspeed,battery-sensing:
    type: boolean
    description:
      Inform the driver that last channel will be used to sensor battery.

required:
  - compatible
  - reg
  - clocks
  - resets
  - "#io-channel-cells"

additionalProperties: false

examples:
  - |
    #include <dt-bindings/clock/ast2600-clock.h>
    adc0: adc@1e6e9000 {
        compatible = "aspeed,ast2600-adc0";
        reg = <0x1e6e9000 0x100>;
        clocks = <&syscon ASPEED_CLK_APB2>;
        resets = <&syscon ASPEED_RESET_ADC>;
        #io-channel-cells = <1>;
        aspeed,int-vref-microvolt = <2500000>;
    };
    adc1: adc@1e6e9100 {
        compatible = "aspeed,ast2600-adc1";
        reg = <0x1e6e9100 0x100>;
        clocks = <&syscon ASPEED_CLK_APB2>;
        resets = <&syscon ASPEED_RESET_ADC>;
        #io-channel-cells = <1>;
        aspeed,int-vref-microvolt = <2500000>;
    };
...