linux-kernel - Re: [PATCH net-next v5 4/7] net: pse-pd: Add new power limit get and set c33 features

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Date: Fri, 28 Jun 2024 10:53:35 +0200
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Kory Maincent <kory.maincent@...tlin.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Donald Hunter <donald.hunter@...il.com>,
	Jonathan Corbet <corbet@....net>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Dent Project <dentproject@...uxfoundation.org>,
	kernel@...gutronix.de, linux-doc@...r.kernel.org,
	Sai Krishna <saikrishnag@...vell.com>
Subject: Re: [PATCH net-next v5 4/7] net: pse-pd: Add new power limit get and
 set c33 features

On Fri, Jun 28, 2024 at 10:31:57AM +0200, Kory Maincent wrote:
> From: Kory Maincent (Dent Project) <kory.maincent@...tlin.com>
> 
> This patch add a way to get and set the power limit of a PSE PI.
> For that it uses regulator API callbacks wrapper like get_voltage() and
> get/set_current_limit() as power is simply V * I.
> We used mW unit as defined by the IEEE 802.3-2022 standards.
> 
> set_current_limit() uses the voltage return by get_voltage() and the
> desired power limit to calculate the current limit. get_voltage() callback
> is then mandatory to set the power limit.
> 
> get_current_limit() callback is by default looking at a driver callback
> and fallback to extracting the current limit from _pse_ethtool_get_status()
> if the driver does not set its callback. We prefer let the user the choice
> because ethtool_get_status return much more information than the current
> limit.
> 
> expand pse status with c33_pw_limit_ranges to return the ranges available
> to configure the power limit.
> 
> Reviewed-by: Sai Krishna <saikrishnag@...vell.com>
> Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>

Acked-by: Oleksij Rempel <o.rempel@...gutronix.de>

Thank you!

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