linux-kernel - Re: [PATCH v2 2/3] dt-bindings: platform: Add Surface System Aggregator Module

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Message-ID: <1a6ebc27-95ca-4f56-9971-b2a8d03f270a@kernel.org>
Date: Sun, 11 Aug 2024 16:28:33 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Jiri Slaby <jirislaby@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, "Rafael J. Wysocki" <rafael@...nel.org>,
 Len Brown <lenb@...nel.org>, Maximilian Luz <luzmaximilian@...il.com>,
 Hans de Goede <hdegoede@...hat.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>,
 linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org, linux-acpi@...r.kernel.org,
 platform-driver-x86@...r.kernel.org, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <quic_kdybcio@...cinc.com>
Subject: Re: [PATCH v2 2/3] dt-bindings: platform: Add Surface System
 Aggregator Module

On 10/08/2024 03:28, Konrad Dybcio wrote:
> From: Konrad Dybcio <quic_kdybcio@...cinc.com>
> 
> Add bindings for the Surface System Aggregator Module (SAM/SSAM), the
> Microsoft Surface-standard Embedded Controller, used on both x86- and
> Qualcomm-based devices.
> 
> It provides a plethora of functions, depending on what's wired up to
> it. That includes but is not limited to: fan control, keyboard/touchpad
> support, thermal sensors, power control, special buttons, tablet mode.
> 
> Signed-off-by: Konrad Dybcio <quic_kdybcio@...cinc.com>
> ---
>  .../bindings/platform/microsoft,surface-sam.yaml   | 50 ++++++++++++++++++++++
>  1 file changed, 50 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/platform/microsoft,surface-sam.yaml b/Documentation/devicetree/bindings/platform/microsoft,surface-sam.yaml
> new file mode 100644
> index 000000000000..f613738aa31d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/platform/microsoft,surface-sam.yaml
> @@ -0,0 +1,50 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/platform/microsoft,surface-sam.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Surface System Aggregator Module (SAM, SSAM)
> +
> +maintainers:
> +  - Konrad Dybcio <konradybcio@...nel.org>
> +
> +description: |

No need for |

> +  Surface devices use a standardized embedded controller to let the
> +  operating system interface with various hardware functions. The
> +  specific functionalities are modeled as subdevices and matched on
> +  five levels: domain, category, target, instance and function.
> +
> +properties:
> +  compatible:
> +    const: microsoft,surface-sam
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  current-speed:
> +    description: The baudrate in bits per second of the device as it comes
> +      online, current active speed.
> +    $ref: /schemas/types.yaml#/definitions/uint32

This should be just "current-speed: true", because the type will be
brought by serial schema. We should however have some schema with
peripheral properties for serial devices. I'll come with something.

Best regards,
Krzysztof