linux-kernel - Re: [PATCH 2/3] dt-bindings: m41t80: add xtal load capacitance

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Message-ID: <a3414477-eb9b-83ee-ab11-b2b629b6d23b@linaro.org>
Date:   Tue, 20 Dec 2022 11:52:02 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Dennis Lambe Jr <dennis@...rkcharge.io>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rtc@...r.kernel.org, Alexander Bigga <ab@...able.de>
Subject: Re: [PATCH 2/3] dt-bindings: m41t80: add xtal load capacitance

On 19/12/2022 20:09, Dennis Lambe Jr wrote:
> The ST m41t82 and m41t83 support programmable load capacitance from 3.5
> pF to 17.4 pF. The hardware defaults to 12.5 pF.
> 
> The accuracy of the xtal can be calibrated precisely by adjusting the
> load capacicance.
> 
> Add default, minimum, and maximum for the standard rtc property
> quartz-load-femtofarads on compatible devices.
> 
> Signed-off-by: Dennis Lambe Jr <dennis@...rkcharge.io>
> ---
>  .../devicetree/bindings/rtc/st,m41t80.yaml     | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/rtc/st,m41t80.yaml b/Documentation/devicetree/bindings/rtc/st,m41t80.yaml
> index fc9c6da6483f..6b72580dc031 100644
> --- a/Documentation/devicetree/bindings/rtc/st,m41t80.yaml
> +++ b/Documentation/devicetree/bindings/rtc/st,m41t80.yaml
> @@ -33,6 +33,11 @@ properties:
>    "#clock-cells":
>      const: 1
>  
> +  quartz-load-femtofarads:
> +    default: 12500
> +    minimum: 3500
> +    maximum: 17375
> +
>    clock-output-names:
>      maxItems: 1
>      description: From common clock binding to override the default output clock name.
> @@ -44,8 +49,21 @@ properties:
>        clock-frequency:
>          const: 32768
>  
> +  wakeup-source: true

Why do you need it here? It's already accepted in rtc.yaml. Adding it is
not explained in commit msg.

> +
>  allOf:


Best regards,
Krzysztof