linux-kernel - Re: [PATCH v9 2/3] dt-bindings: hwmon: Support Aspeed g6 PWM TACH Control

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Message-ID: <20231002152819.GB1747496-robh@kernel.org>
Date:   Mon, 2 Oct 2023 10:28:19 -0500
From:   Rob Herring <robh@...nel.org>
To:     Billy Tsai <billy_tsai@...eedtech.com>
Cc:     jdelvare@...e.com, linux@...ck-us.net,
        krzysztof.kozlowski+dt@...aro.org, joel@....id.au, andrew@...id.au,
        corbet@....net, thierry.reding@...il.com,
        u.kleine-koenig@...gutronix.de, p.zabel@...gutronix.de,
        naresh.solanki@...ements.com, linux-hwmon@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-pwm@...r.kernel.org,
        BMC-SW@...eedtech.com, patrick@...cx.xyz
Subject: Re: [PATCH v9 2/3] dt-bindings: hwmon: Support Aspeed g6 PWM TACH
 Control

On Mon, Sep 18, 2023 at 02:41:10PM +0800, Billy Tsai wrote:
> Document the compatible for aspeed,ast2600-pwm-tach device, which can
> support up to 16 PWM outputs and 16 fan tach input.
> 
> Signed-off-by: Billy Tsai <billy_tsai@...eedtech.com>
> ---
>  .../bindings/hwmon/aspeed,g6-pwm-tach.yaml    | 69 +++++++++++++++++++
>  1 file changed, 69 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/hwmon/aspeed,g6-pwm-tach.yaml
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/aspeed,g6-pwm-tach.yaml b/Documentation/devicetree/bindings/hwmon/aspeed,g6-pwm-tach.yaml
> new file mode 100644
> index 000000000000..5a679f4ad2fa
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/aspeed,g6-pwm-tach.yaml
> @@ -0,0 +1,69 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2023 Aspeed, Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/hwmon/aspeed,g6-pwm-tach.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ASPEED G6 PWM and Fan Tach controller device driver

This is binding for the h/w, not a 'device driver'.

> +
> +maintainers:
> +  - Billy Tsai <billy_tsai@...eedtech.com>
> +
> +description: |
> +  The ASPEED PWM controller can support up to 16 PWM outputs.
> +  The ASPEED Fan Tacho controller can support up to 16 fan tach input.
> +  They are independent hardware blocks, which are different from the
> +  previous version of the ASPEED chip.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - aspeed,ast2600-pwm-tach
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  resets:
> +    maxItems: 1
> +
> +  "#pwm-cells":
> +    const: 3
> +
> +patternProperties:
> +  "^fan-[0-9a-f]+$":

foo-<index> naming is decimal, not hex. (unit-addresses are hex)

But if 0 and 1 correspond to something in the h/w, then you should 
probably be using 'reg' instead (which means a unit-address too).

> +    $ref: fan-common.yaml#
> +    unevaluatedProperties: false
> +    required:
> +      - tach-ch
> +
> +required:
> +  - reg
> +  - clocks
> +  - resets
> +  - "#pwm-cells"
> +  - compatible
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/aspeed-clock.h>
> +    pwm_tach: pwm-tach-controller@...10000 {
> +      compatible = "aspeed,ast2600-pwm-tach";
> +      reg = <0x1e610000 0x100>;
> +      clocks = <&syscon ASPEED_CLK_AHB>;
> +      resets = <&syscon ASPEED_RESET_PWM>;
> +      #pwm-cells = <3>;
> +
> +      fan-0 {
> +        tach-ch = /bits/ 8 <0x0>;

What about the PWM connection?

> +      };
> +
> +      fan-1 {
> +        tach-ch = /bits/ 8 <0x1 0x2>;
> +      };
> +    };
> -- 
> 2.25.1
>