linux-kernel - Re: [PATCH net-next 04/12] net: pse-pd: tps23881: Add support for power limit and measurement features

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Message-ID: <ZwYOboTdMppaZVmX@pengutronix.de>
Date: Wed, 9 Oct 2024 07:02:38 +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>,
	Jonathan Corbet <corbet@....net>,
	Donald Hunter <donald.hunter@...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
Subject: Re: [PATCH net-next 04/12] net: pse-pd: tps23881: Add support for
 power limit and measurement features

On Wed, Oct 02, 2024 at 06:28:00PM +0200, Kory Maincent wrote:
> From: Kory Maincent (Dent Project) <kory.maincent@...tlin.com>
> 
> Expand PSE callbacks to support the newly introduced
> pi_get/set_current_limit() and pi_get_voltage() functions. These callbacks
> allow for power limit configuration in the TPS23881 controller.
> 
> Additionally, the patch includes the detected class, the current power
> delivered and the power limit ranges in the status returned, providing more
> comprehensive PoE status reporting.
> 
> Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>

> +static int tps23881_pi_get_class(struct tps23881_priv *priv, int id)
> +{
....
> +	if (chan < 4)
> +		class = ret >> 4;
> +	else
> +		class = ret >> 12;

....
> +tps23881_pi_set_2p_pw_limit(struct tps23881_priv *priv, u8 chan, u8 pol)
> +{
....
> +	reg = TPS23881_REG_2PAIR_POL1 + (chan % 4);
> +	ret = i2c_smbus_read_word_data(client, reg);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (chan < 4)
> +		val = (ret & 0xff00) | pol;
> +	else
> +		val = (ret & 0xff) | (pol << 8);

This is a common pattern in this driver, we read and write two registers
in one run and then calculate bit offset for the channel, can you please
move it in to separate function. This can be done in a separate patch if
you like.

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

Thank you!
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