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

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Message-ID: <13f254ed-68b7-438e-91a8-9d75c9e9f2a7@kernel.org>
Date: Wed, 14 Aug 2024 08:16:22 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Konrad Dybcio <konradybcio@...il.com>,
 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 13/08/2024 16:27, Konrad Dybcio wrote:
> On 11.08.2024 4:28 PM, Krzysztof Kozlowski wrote:
>> 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 |
> 
> Apparently it's necessary because I have a :
>>
>>> +  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.
> 
>                  ^ here
> 
> Should I e.g. s/:/-/, or keep the |?

Keep |

> 
>>> +
>>> +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.
> 
> I suppose I should just include:
> 
> https://lore.kernel.org/linux-serial/20240811-dt-bindings-serial-peripheral-props-v1-0-1dba258b7492@linaro.org/

You could, but then your patchset will depend on mine, so instead I
propose just "current-speed: true" and later (next release) we will add
$ref to serial-peripheral-props.

Best regards,
Krzysztof