linux-kernel - Re: [PATCH v4 3/5] regulator: dt-bindings: Allow system-critical marking for fixed-regulator

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Date:   Fri, 27 Oct 2023 16:24:40 -0500
From:   Rob Herring <robh@...nel.org>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v4 3/5] regulator: dt-bindings: Allow system-critical
 marking for fixed-regulator

On Thu, Oct 26, 2023 at 04:48:22PM +0200, Oleksij Rempel wrote:
> In certain projects, the main system regulator, composed of simple
> components including an under-voltage detector and capacitors, can be
> aptly described as a fixed regulator in the device tree. To cater to
> such use cases, this patch extends the fixed regulator binding to
> support the 'system-critical-regulator' property. This property
> signifies that the fixed-regulator is vital for system stability.

There is no programming interface for fixed-regulators, so how do you 
know an under/over voltage condition?

> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  .../devicetree/bindings/regulator/fixed-regulator.yaml          | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/regulator/fixed-regulator.yaml b/Documentation/devicetree/bindings/regulator/fixed-regulator.yaml
> index ce7751b9129c..9ff9abf2691a 100644
> --- a/Documentation/devicetree/bindings/regulator/fixed-regulator.yaml
> +++ b/Documentation/devicetree/bindings/regulator/fixed-regulator.yaml
> @@ -105,6 +105,8 @@ properties:
>      description:
>        Interrupt signaling a critical under-voltage event.
>  
> +  system-critical-regulator: true
> +
>  required:
>    - compatible
>    - regulator-name
> -- 
> 2.39.2
>