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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/Documentation/devicetree/bindings/hwmon/aspeed,g6-pwm-tach.yaml
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

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# Copyright (C) 2023 Aspeed, Inc.

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%YAML 1.2

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---

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$id: http://devicetree.org/schemas/hwmon/aspeed,g6-pwm-tach.yaml#

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

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title: ASPEED G6 PWM and Fan Tach controller

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maintainers:

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  - Billy Tsai <billy_tsai@aspeedtech.com>

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description: |

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  The ASPEED PWM controller can support up to 16 PWM outputs.

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  The ASPEED Fan Tacho controller can support up to 16 fan tach input.

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  They are independent hardware blocks, which are different from the

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  previous version of the ASPEED chip.

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properties:

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  compatible:

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    oneOf:

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      - items:

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          - const: aspeed,ast2700-pwm-tach

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          - const: aspeed,ast2600-pwm-tach

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      - const: aspeed,ast2600-pwm-tach

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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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  resets:

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    maxItems: 1

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  "#pwm-cells":

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    const: 3

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patternProperties:

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  "^fan-[0-9]+$":

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    $ref: fan-common.yaml#

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    unevaluatedProperties: false

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    required:

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      - tach-ch

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required:

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  - reg

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  - clocks

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  - resets

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  - "#pwm-cells"

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  - compatible

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additionalProperties: false

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examples:

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  - |

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

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    pwm_tach: pwm-tach-controller@1e610000 {

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      compatible = "aspeed,ast2600-pwm-tach";

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      reg = <0x1e610000 0x100>;

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      clocks = <&syscon ASPEED_CLK_AHB>;

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      resets = <&syscon ASPEED_RESET_PWM>;

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      #pwm-cells = <3>;

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      fan-0 {

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        tach-ch = /bits/ 8 <0x0>;

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        pwms = <&pwm_tach 0 40000 0>;

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      };

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      fan-1 {

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        tach-ch = /bits/ 8 <0x1 0x2>;

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        pwms = <&pwm_tach 1 40000 0>;

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      };

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    };

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