linux-kernel - Re: [PATCH v6 3/6] dt-bindings: mfd: ahc1ec0.yaml: Add Advantech embedded controller

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Message-ID: <20210205212133.GA3759495@robh.at.kernel.org>
Date:   Fri, 5 Feb 2021 15:21:33 -0600
From:   Rob Herring <robh@...nel.org>
To:     Campion Kang <campion.kang@...antech.com.tw>
Cc:     Lee Jones <lee.jones@...aro.org>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-hwmon@...r.kernel.org, linux-watchdog@...r.kernel.org,
        AceLan Kao <chia-lin.kao@...onical.com>
Subject: Re: [PATCH v6 3/6] dt-bindings: mfd: ahc1ec0.yaml: Add Advantech
 embedded controller - AHC1EC0

On Mon, Jan 18, 2021 at 08:37:46PM +0800, Campion Kang wrote:
> Add DT binding schema for Advantech embedded controller AHC1EC0.
> 
> Changed since V5:
> 	- rename dt-bindings/mfd/ahc1ec0.h to dt-bindings/mfd/ahc1ec0-dt.h
> 	that found errors by bot 'make dt_binding_check'
> 
> Signed-off-by: Campion Kang <campion.kang@...antech.com.tw>
> ---
>  .../devicetree/bindings/mfd/ahc1ec0.yaml      | 69 +++++++++++++++++++
>  1 file changed, 69 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/ahc1ec0.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mfd/ahc1ec0.yaml b/Documentation/devicetree/bindings/mfd/ahc1ec0.yaml
> new file mode 100644
> index 000000000000..40af14bb9c0a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/ahc1ec0.yaml
> @@ -0,0 +1,69 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mfd/ahc1ec0.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Advantech Embedded Controller (AHC1EC0)
> +
> +maintainers:
> +  - Campion Kang <campion.kang@...antech.com.tw>
> +
> +description: |
> +  AHC1EC0 is one of the embedded controllers used by Advantech to provide several
> +  functions such as watchdog, hwmon, brightness, etc. Advantech related applications
> +  can control the whole system via these functions.
> +
> +properties:
> +  compatible:
> +    const: advantech,ahc1ec0
> +
> +  advantech,sub-dev-nb:
> +    description:
> +      The number of sub-devices specified in the platform.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    maxItems: 1

You don't need this, just count the length of the next property:

> +
> +  advantech,sub-dev:
> +    description:
> +      A list of the sub-devices supported in the platform. Defines for the
> +      appropriate values can found in dt-bindings/mfd/ahc1ec0-dt.h.
> +    $ref: "/schemas/types.yaml#/definitions/uint32-array"
> +    minItems: 1
> +    maxItems: 6

But as I said before, this binding is odd. It doesn't look like how we 
do any other MFD. Either we have child nodes or they are implicit.

> +
> +  advantech,hwmon-profile:
> +    description:
> +      The number of sub-devices specified in the platform. Defines for the
> +      hwmon profiles can found in dt-bindings/mfd/ahc1ec0-dt.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - advantech,sub-dev-nb
> +  - advantech,sub-dev
> +
> +if:
> +  properties:
> +    advantech,sub-dev:
> +      contains:
> +        const: 0x3
> +then:
> +  required:
> +    - advantech,hwmon-profile
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/mfd/ahc1ec0-dt.h>
> +    ahc1ec0 {
> +        compatible = "advantech,ahc1ec0";
> +
> +        advantech,sub-dev-nb = <2>;
> +        advantech,sub-dev = <AHC1EC0_SUBDEV_HWMON
> +                             AHC1EC0_SUBDEV_WDT>;
> +
> +        advantech,hwmon-profile = <AHC1EC0_HWMON_PRO_UNO2271G>;
> +    };
> -- 
> 2.17.1
>