linux-kernel - Re: [PATCH 1/5] dt-binding: trivial-devices: add arduino spi mcu interface

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Message-ID: <cf1e86c7-a7fa-48e7-b672-7ce575b17315@kernel.org>
Date: Fri, 7 Nov 2025 08:10:54 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Riccardo Mereu <r.mereu.kernel@...uino.cc>, andersson@...nel.org,
 konradybcio@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, broonie@...nel.org
Cc: linux@...ck-us.net, Jonathan.Cameron@...wei.com, wenswang@...h.net,
 naresh.solanki@...ements.com, michal.simek@....com, nuno.sa@...log.com,
 chou.cosmo@...il.com, grantpeltier93@...il.com, eajames@...ux.ibm.com,
 farouk.bouabid@...rry.de, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-spi@...r.kernel.org, mm.facchin@...uino.cc,
 Riccardo Mereu <r.mereu@...uino.cc>
Subject: Re: [PATCH 1/5] dt-binding: trivial-devices: add arduino spi mcu
 interface

On 06/11/2025 16:31, Riccardo Mereu wrote:
> Add spidev item in order to describe in Arduino boards one of the
> interfaces between microprocessor and microcontroller.
> 
> Signed-off-by: Riccardo Mereu <r.mereu@...uino.cc>
> ---
>  Documentation/devicetree/bindings/trivial-devices.yaml | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/trivial-devices.yaml b/Documentation/devicetree/bindings/trivial-devices.yaml
> index 2eff6f274302..c44fff4ce2e2 100644
> --- a/Documentation/devicetree/bindings/trivial-devices.yaml
> +++ b/Documentation/devicetree/bindings/trivial-devices.yaml
> @@ -59,6 +59,8 @@ properties:
>            - adi,lt7182s
>              # AMS iAQ-Core VOC Sensor
>            - ams,iaq-core
> +            # Arduino microcontroller interface over SPI, e.g. on UnoQ board
> +          - arduino,mcu

MCU is so broad it can cover everything, so for sure this is not a
trivial device. It also can be connected over serial, which would not be
covered here. Or can have additional GPIOs connected or supplies - also
not covered here.

Best regards,
Krzysztof