linux-kernel - Re: [PATCH 1/3] dt-bindings: platform: Add Lenovo Thinkpad T14s EC

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Message-ID: <aec3629c-27a0-49d9-9fcf-5922b0f9035f@kernel.org>
Date: Mon, 1 Sep 2025 11:28:24 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Sebastian Reichel <sre@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Hans de Goede <hansg@...nel.org>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>,
 Mark Pearson <mpearson-lenovo@...ebb.ca>
Cc: "Derek J. Clark" <derekjohn.clark@...il.com>,
 Henrique de Moraes Holschuh <hmh@....eng.br>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
 linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: platform: Add Lenovo Thinkpad T14s EC

On 31/08/2025 23:28, Sebastian Reichel wrote:
> Add binding for the EC found in the Thinkpad T14s Gen6 Snapdragon,
> which is based on the Qualcomm X1 Elite. Some of the system LEDs
> and extra keys are only accessible via the EC.
> 
> Signed-off-by: Sebastian Reichel <sre@...nel.org>
> ---
>  .../bindings/platform/lenovo,thinkpad-t14s-ec.yaml | 49 ++++++++++++++++++++++

Please place it in embedded-controller. I moved there all ECs.

>  1 file changed, 49 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/platform/lenovo,thinkpad-t14s-ec.yaml b/Documentation/devicetree/bindings/platform/lenovo,thinkpad-t14s-ec.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..bab20df2d9ede9a3cb0359944b26b3d18ff7d9b8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/platform/lenovo,thinkpad-t14s-ec.yaml
> @@ -0,0 +1,49 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/platform/lenovo,thinkpad-t14s-ec.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Lenovo Thinkpad T14s Embedded Controller.

Drop full stop, titles never have them.

> +
> +maintainers:
> +  - Sebastian Reichel <sre@...nel.org>
> +
> +description:
> +  The Qualcomm Snapdragon-based Lenovo Thinkpad T14s has an Embedded Controller
> +  (EC) which handles things such as keyboard backlight, LEDs or non-standard keys.

Please wrap at 80.

> +  This binding describes the interface, on an I2C bus, to this EC.

Drop, or just describe the hardware, not binding.

> +
> +properties:
> +  compatible:
> +    const: lenovo,thinkpad-t14s-ec
> +
> +  reg:
> +    const: 0x28
> +
> +  interrupts:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +additionalProperties: false
> +
> +examples:
> +  - |+
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    i2c1 {

i2c

> +        clock-frequency = <400000>;

Drop

> +
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        embedded-controller@28 {
> +            compatible = "lenovo,thinkpad-t14s-ec";
> +            reg = <0x28>;
> +            interrupts-extended = <&tlmm 66 IRQ_TYPE_LEVEL_LOW>;
> +        };
> +    };
> +...
> 

Best regards,
Krzysztof