linux-kernel - Re: [PATCH v2 1/3] dt-bindings: power: supply: Add Acer Aspire 1 EC

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Date: Thu, 14 Dec 2023 16:02:10 -0600
From: Rob Herring <robh@...nel.org>
To: Nikita Travkin <nikita@...n.ru>
Cc: Sebastian Reichel <sre@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, cros-qcom-dts-watchers@...omium.org, Andy Gross <agross@...nel.org>, Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, linux-pm@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 1/3] dt-bindings: power: supply: Add Acer Aspire 1 EC

On Tue, Dec 12, 2023 at 05:49:09PM +0500, Nikita Travkin wrote:
> Add binding for the EC found in the Acer Aspire 1 laptop.
> 
> Signed-off-by: Nikita Travkin <nikita@...n.ru>
> ---
>  .../bindings/power/supply/acer,aspire1-ec.yaml     | 67 ++++++++++++++++++++++
>  1 file changed, 67 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/power/supply/acer,aspire1-ec.yaml b/Documentation/devicetree/bindings/power/supply/acer,aspire1-ec.yaml
> new file mode 100644
> index 000000000000..1fbf1272a00f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/supply/acer,aspire1-ec.yaml
> @@ -0,0 +1,67 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/power/supply/acer,aspire1-ec.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Acer Aspire 1 Embedded Controller
> +
> +maintainers:
> +  - Nikita Travkin <nikita@...n.ru>
> +
> +description:
> +  The Acer Aspire 1 laptop uses an embedded controller to control battery
> +  and charging as well as to provide a set of misc features such as the
> +  laptop lid status and HPD events for the USB Type-C DP alt mode.
> +
> +properties:
> +  compatible:
> +    const: acer,aspire1-ec
> +
> +  reg:
> +    const: 0x76
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  acer,media-keys-on-top:
> +    description: Configure the keyboard layout to use media features of
> +      the fn row when the fn key is not pressed. The firmware may choose
> +      to add this property when user selects the fn mode in the firmware
> +      setup utility.
> +    type: boolean

Besides the naming, this isn't really a property of the EC, but really 
part of the keyboard layout. It seems you just stuck it here because 
this is part of the specific device.

It is also hardly a feature unique to this device. I'm typing this from 
a device with the exact same thing (M1 Macbook Pro). Actually, all 3 
laptops I have in front of me have the same thing. The other 2 have 
a Fnlock (Fn+ESC) though.  On the M1, it's just a module param which I 
set as persistent. Though I now wonder if the Fnlock could be 
implemented on it too. Being able to switch whenever I want would be 
nice. That would probably have to be in Linux where as these other 
laptops probably implement this in their EC/firmware?

What I'm getting at is controlling changing this in firmware is not a 
great experience and this should all be common.

Rob