linux-kernel - Re: [PATCH 1/2] dt-bindings: rtc: add properties to set battery-related functions

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Date:   Tue, 8 Aug 2023 12:21:24 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Hugo Villeneuve <hugo@...ovil.com>
Cc:     a.zummo@...ertech.it, alexandre.belloni@...tlin.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, linux-rtc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        bruno.thomsen@...il.com, Hugo Villeneuve <hvilleneuve@...onoff.com>
Subject: Re: [PATCH 1/2] dt-bindings: rtc: add properties to set
 battery-related functions

Hey Hugo,

On Wed, Aug 02, 2023 at 03:11:52PM -0400, Hugo Villeneuve wrote:
> From: Hugo Villeneuve <hvilleneuve@...onoff.com>
> 
> These properties can be defined in the board's device tree to set the
> default power-on values for battery-related functions.
> 
> Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>
> ---
>  .../devicetree/bindings/rtc/rtc.yaml          | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/rtc/rtc.yaml b/Documentation/devicetree/bindings/rtc/rtc.yaml
> index efb66df82782..0217d229e3fa 100644
> --- a/Documentation/devicetree/bindings/rtc/rtc.yaml
> +++ b/Documentation/devicetree/bindings/rtc/rtc.yaml
> @@ -26,6 +26,25 @@ properties:
>        0: not chargeable
>        1: chargeable
>  
> +  battery-low-detect:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [0, 1]
> +    description: |
> +      For RTC devices supporting a backup battery/supercap, this flag can be
> +      used to configure the battery low detection reporting function:
> +      0: disabled
> +      1: enabled
> +
> +  battery-switch-over:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [0, 1]
> +    description: |
> +      For RTC devices supporting a backup battery/supercap, this flag can be
> +      used to configure the battery switch over when the main voltage source is
> +      turned off:
> +      0: disabled
> +      1: enabled

Why are these implemented as enums? This seems to fall into the category
of using DT to determine software policy - why's it not sufficient to
have boolean properties that indicate hardware support and let the software
decide what to do with them?

Thanks,
Conor.

> +
>    quartz-load-femtofarads:
>      description:
>        The capacitive load of the quartz(x-tal), expressed in femto
> -- 
> 2.30.2
> 

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