linux-kernel - Re: [PATCH RFC net-next v2 11/18] regulator: Add support for power budget description

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Message-ID: <578d2348-9a17-410e-b7c8-772c0d82c10f@sirena.org.uk>
Date: Wed, 30 Oct 2024 17:03:06 +0000
From: Mark Brown <broonie@...nel.org>
To: Kory Maincent <kory.maincent@...tlin.com>
Cc: Andrew Lunn <andrew@...n.ch>, Oleksij Rempel <o.rempel@...gutronix.de>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Jonathan Corbet <corbet@....net>,
	Donald Hunter <donald.hunter@...il.com>,
	Rob Herring <robh@...nel.org>, Andrew Lunn <andrew+netdev@...n.ch>,
	Simon Horman <horms@...nel.org>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Liam Girdwood <lgirdwood@...il.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	linux-doc@...r.kernel.org, Kyle Swenson <kyle.swenson@....tech>,
	Dent Project <dentproject@...uxfoundation.org>,
	kernel@...gutronix.de,
	Maxime Chevallier <maxime.chevallier@...tlin.com>
Subject: Re: [PATCH RFC net-next v2 11/18] regulator: Add support for power
 budget description

On Wed, Oct 30, 2024 at 05:53:13PM +0100, Kory Maincent wrote:

> +/**
> + * regulator_get_power_budget - get regulator total power budget
> + * @regulator: regulator source
> + *
> + * Return: Power budget of the regulator in mW.
> + */
> +int regulator_get_power_budget(struct regulator *regulator)
> +{
> +	return regulator->rdev->constraints->pw_budget;
> +}

This is going to go badly with multiple consumers...

> +static inline int regulator_get_power_budget(struct regulator *regulator)
> +{
> +	return 0;
> +}

We should probably default to INT_MAX here and in the case where we do
have support, that way consumers will fail gracefully when no budget is
specified.

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