linux-kernel - Re: [PATCH v4 4/5] regulator: dt-bindings: Add 'regulator-uv-less-critical-window-ms' property

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Message-ID: <169844197767.3399644.2264278989526622921.robh@kernel.org>
Date:   Fri, 27 Oct 2023 16:26:18 -0500
From:   Rob Herring <robh@...nel.org>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Rob Herring <robh+dt@...nel.org>, kernel@...gutronix.de,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, Conor Dooley <conor+dt@...nel.org>,
        linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>
Subject: Re: [PATCH v4 4/5] regulator: dt-bindings: Add
 'regulator-uv-less-critical-window-ms' property


On Thu, 26 Oct 2023 16:48:23 +0200, Oleksij Rempel wrote:
> Introduces a new devicetree property to specifies the time window (in
> milliseconds) following a critical under-voltage (UV) event during which
> less critical actions can be safely carried out by the system.
> 
> Less Critical Actions:
> - Logging the under-voltage event for later analysis.
> - Saving less critical data that may be useful for diagnosing issues or
>   for audit purposes.
> 
> More Critical Actions (post the less critical window):
> - Initiating procedures to properly shutdown hardware to prevent damage.
> 
> The 'regulator-uv-less-critical-window-ms' property is crucial for
> conveying board-specific hardware characteristics, not for enforcing a
> certain policy. The time window represented by this property is derived
> from the physical attributes of the hardware like the capacity of
> on-board capacitors, the power consumption of the components, and the
> time needed to safely shut down hardware to prevent damage. These
> attributes can significantly vary between different boards, making it a
> board-specific property rather than a policy directive.
> 
> By providing a precise representation of the time available for less
> critical actions post an under-voltage event, this property enables the
> kernel to make informed decisions on action prioritization, ensuring
> that essential preventative measures are taken to avoid hardware damage
> while also allowing for data capture and analysis.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  .../devicetree/bindings/regulator/regulator.yaml          | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 

Acked-by: Rob Herring <robh@...nel.org>