linux-kernel - Re: [PATCH v2 1/3] dt-bindings: platform: Add bindings for Qcom's EC on IT8987

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Message-ID: <Z2WxzvKRVcOz5d2V@linaro.org>
Date: Fri, 20 Dec 2024 19:05:02 +0100
From: Stephan Gerhold <stephan.gerhold@...aro.org>
To: Maya Matuszczyk <maccraft123mc@...il.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] dt-bindings: platform: Add bindings for Qcom's EC
 on IT8987

On Thu, Dec 19, 2024 at 09:08:18PM +0100, Maya Matuszczyk wrote:
> This patch adds bindings for the EC firmware running on IT8987 present
> on most of X1E80100 devices
> 
> Signed-off-by: Maya Matuszczyk <maccraft123mc@...il.com>
> ---
>  .../bindings/platform/qcom,x1e-it8987-ec.yaml | 52 +++++++++++++++++++
>  1 file changed, 52 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/platform/qcom,x1e-it8987-ec.yaml
> 
> diff --git a/Documentation/devicetree/bindings/platform/qcom,x1e-it8987-ec.yaml b/Documentation/devicetree/bindings/platform/qcom,x1e-it8987-ec.yaml
> new file mode 100644
> index 000000000000..4a4f6eb63072
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/platform/qcom,x1e-it8987-ec.yaml
> @@ -0,0 +1,52 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/platform/qcom,x1e-it8987-ec.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Embedded Controller on IT8987 chip.
> +
> +maintainers:
> +  - Maya Matuszczyk <maccraft123mc@...il.com>
> +
> +description:
> +  Most x1e80100 laptops have an EC running on IT8987 MCU chip. The EC controls
> +  minor functions, like fans, power LED, and on some laptops it also handles
> +  keyboard hotkeys.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - const: qcom,x1e-it8987-ec

Given that ECs tend to be somewhat device-specific and many vendors
might have slightly customized the EC firmware(?), I think it would be
better to disallow using this generic compatible without a more specific
one. In other words, I would drop this line and just keep the case
below:

> +      - items:
> +        - const: lenovo,yoga-slim7x-ec
> +        - const: qcom,x1e-it8987-ec

People can add compatible entries for other devices as needed.

Thanks,
Stephan