linux-kernel - Re: [PATCH net-next v6 17/17] net: pse-pd: Add TI TPS23881 PSE controller driver

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Date: Fri, 29 Mar 2024 15:55:35 +0100
From: Kory Maincent <kory.maincent@...tlin.com>
To: Andrew Lunn <andrew@...n.ch>
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>, Luis Chamberlain
 <mcgrof@...nel.org>, Russ Weight <russ.weight@...ux.dev>, Greg
 Kroah-Hartman <gregkh@...uxfoundation.org>, "Rafael J. Wysocki"
 <rafael@...nel.org>, Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
 Oleksij Rempel <o.rempel@...gutronix.de>, Mark Brown <broonie@...nel.org>,
 Frank Rowand <frowand.list@...il.com>, Heiner Kallweit
 <hkallweit1@...il.com>, Russell King <linux@...linux.org.uk>, Thomas
 Petazzoni <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
 devicetree@...r.kernel.org, Dent Project <dentproject@...uxfoundation.org>
Subject: Re: [PATCH net-next v6 17/17] net: pse-pd: Add TI TPS23881 PSE
 controller driver

On Thu, 28 Mar 2024 17:17:43 +0100
Andrew Lunn <andrew@...n.ch> wrote:

> > +
> > +	/* Set operating mode */
> > +	ret = i2c_smbus_write_word_data(client, TPS23881_REG_OP_MODE,
> > 0xaaaa);  
> 
> Could you add some #defines here? This is semiauto i think?

Yes

> > +	/* Enable detection and classification */
> > +	val = 0;
> > +	for (i = 0; i < TPS23881_MAX_CHANS; i++) {
> > +		if (!port_matrix[i].exist)
> > +			continue;
> > +
> > +		val |= BIT(port_matrix[i].lgcl_chan[0]) |
> > +		       BIT(port_matrix[i].lgcl_chan[0] + 4);
> > +		if (port_matrix[i].is_4p)
> > +			val |= BIT(port_matrix[i].lgcl_chan[1]) |
> > +			       BIT(port_matrix[i].lgcl_chan[1] + 4);
> > +	}
> > +	ret = i2c_smbus_write_word_data(client, TPS23881_REG_DET_CLA_EN,
> > 0xffff);  
> 
> This looks odd. You calculate val, and then don't use it?

Oh indeed, you are right! Thanks for spotting the issue.

Regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com