linux-kernel - Re: [PATCH 1/2] dt-bindings: misc: rohm,bm92txx: Add BM92Txx support

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Date:   Thu, 24 Aug 2023 18:16:44 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>
Cc:     azkali <a.ffcc7@...il.com>, Adam Jiang <chaoj@...dia.com>,
        CTCaer <ctcaer@...il.com>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Derek Kiernan <derek.kiernan@....com>,
        Dragan Cvetic <dragan.cvetic@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: misc: rohm,bm92txx: Add BM92Txx support

On 24/08/2023 17:30, Emmanuel Gil Peyrot wrote:
> The BM92T36 is used in the Nintendo Switch as its USB-C Power Delivery
> controller.
> 
> Signed-off-by: Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>
> ---
>  .../bindings/misc/rohm,bm92txx.yaml           | 67 +++++++++++++++++++
>  MAINTAINERS                                   |  5 ++
>  2 files changed, 72 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/misc/rohm,bm92txx.yaml

That's not misc device but usb, so please put it in usb.

> 
> diff --git a/Documentation/devicetree/bindings/misc/rohm,bm92txx.yaml b/Documentation/devicetree/bindings/misc/rohm,bm92txx.yaml
> new file mode 100644
> index 000000000000..0322a7f096f0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/misc/rohm,bm92txx.yaml
> @@ -0,0 +1,67 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright (C) 2023 Emmanuel Gil Peyrot
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/misc/rohm,bm92txx.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: BM92Txx USB-C Power Delivery Controller
> +
> +maintainers:
> +  - Emmanuel Gil Peyrot <linkmauve@...kmauve.fr>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - rohm,bm92t10
> +      - rohm,bm92t20
> +      - rohm,bm92t30
> +      - rohm,bm92t36
> +      - rohm,bm92t50

Your driver suggests they are fully compatible.

> +
> +  reg:
> +    maxItems: 1
> +
> +  rohm,dp-signal-toggle-on-resume:
> +    type: boolean
> +    description: |
> +      Do a toggle on resume instead of disable in suspend and enable in resume,
> +      because this also disables the LED effects.

That's OS policy, not suitable for DT. Drop the property.

> +
> +  rohm,led-static-on-suspend:
> +    type: boolean
> +    description: Dim or breathing dock LED.

Ditto

> +
> +  rohm,dock-power-limit-disable:
> +    type: boolean
> +    description: Disable the power limit in dock mode.

Your description copies property name, so it is not much useful. Why
this is board-configurable?

> +
> +  rohm,dp-alerts-enable:
> +    type: boolean
> +    description: Enable DisplayPort alerts.

Same questions.

> +
> +  rohm,pd-5v-current-limit-ma:
> +    $ref: /schemas/types.yaml#/definitions/uint32

Use common property units.

> +    default: 2000
> +    description: Current limit in mA when voltage is 5V.
> +

You miss connector, so binding is incomplete. All these properties look
duplicating connector properties.


> +  rohm,pd-9v-current-limit-ma:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    default: 2000
> +    description: Current limit in mA when voltage is 9V.
> +
> +  rohm,pd-12v-current-limit-ma:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    default: 1500
> +    description: Current limit in mA when voltage is 12V.
> +
> +  rohm,pd-15v-current-limit-ma:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    default: 1200
> +    description: Current limit in mA when voltage is 15V.
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false

Missing example. You must have and it must be complete.

Best regards,
Krzysztof