netdev - Re: [net-next] net: phy: marvell-88q2xxx: Enable temperature sensor for mv88q211x

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Message-ID: <20250316120214.GA360499@ragnatech.se>
Date: Sun, 16 Mar 2025 13:02:14 +0100
From: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
To: Heiner Kallweit <hkallweit1@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>, Russell King <linux@...linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Dimitri Fedrau <dima.fedrau@...il.com>, netdev@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org
Subject: Re: [net-next] net: phy: marvell-88q2xxx: Enable temperature sensor
 for mv88q211x

Hi Heiner,

Thanks for your feedback.

On 2025-03-16 12:47:55 +0100, Heiner Kallweit wrote:
> On 16.03.2025 12:20, Niklas Söderlund wrote:
> > The temperature sensor enabled for mv88q222x devices also functions for
> > mv88q211x based devices. Unify the two devices probe functions to enable
> > the sensors for all devices supported by this driver.
> > 
> > The same oddity as for mv88q222x devices exists, the PHY must be up for
> > a correct temperature reading to be reported.
> > 
> In this case, wouldn't it make sense to extend mv88q2xxx_hwmon_is_visible()
> and hide the temp_input attribute if PHY is down? 
> Whatever down here means in detail: Link down? In power-down mode?

These are good suggestions, this issue is being worked on [1]. I just 
wanted to highlight that this entablement behaves the same as the 
current models that support the temperature sensor and log how this was 
tested on mv88q211x.

1.  https://lore.kernel.org/all/20250220-marvell-88q2xxx-hwmon-enable-at-probe-v2-0-78b2838a62da@gmail.com/

> 
> >     # cat /sys/class/hwmon/hwmon9/temp1_input
> >     -75000
> > 
> >     # ifconfig end5 up
> > 
> >     # cat /sys/class/hwmon/hwmon9/temp1_input
> >     59000
> > 
> > Worth noting is that while the temperature register offsets and layout
> > are the same between mv88q211x and mv88q222x devices their names in the
> > datasheets are different. This change keeps the mv88q222x names for the
> > mv88q211x support.
> > 
> > Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@...natech.se>
> > ---
> >  drivers/net/phy/marvell-88q2xxx.c | 14 ++------------
> >  1 file changed, 2 insertions(+), 12 deletions(-)
> > 
> > diff --git a/drivers/net/phy/marvell-88q2xxx.c b/drivers/net/phy/marvell-88q2xxx.c
> > index 15c0f8adc2f5..cdd40b613ce8 100644
> > --- a/drivers/net/phy/marvell-88q2xxx.c
> > +++ b/drivers/net/phy/marvell-88q2xxx.c
> > @@ -834,6 +834,7 @@ static int mv88q2xxx_leds_probe(struct phy_device *phydev)
> >  static int mv88q2xxx_probe(struct phy_device *phydev)
> >  {
> >  	struct mv88q2xxx_priv *priv;
> > +	int ret;
> >  
> >  	priv = devm_kzalloc(&phydev->mdio.dev, sizeof(*priv), GFP_KERNEL);
> >  	if (!priv)
> > @@ -841,17 +842,6 @@ static int mv88q2xxx_probe(struct phy_device *phydev)
> >  
> >  	phydev->priv = priv;
> >  
> > -	return 0;
> > -}
> > -
> > -static int mv88q222x_probe(struct phy_device *phydev)
> > -{
> > -	int ret;
> > -
> > -	ret = mv88q2xxx_probe(phydev);
> > -	if (ret)
> > -		return ret;
> > -
> >  	ret = mv88q2xxx_leds_probe(phydev);
> >  	if (ret)
> >  		return ret;
> > @@ -1124,7 +1114,7 @@ static struct phy_driver mv88q2xxx_driver[] = {
> >  		.phy_id_mask		= MARVELL_PHY_ID_MASK,
> >  		.name			= "mv88q2220",
> >  		.flags			= PHY_POLL_CABLE_TEST,
> > -		.probe			= mv88q222x_probe,
> > +		.probe			= mv88q2xxx_probe,
> >  		.get_features		= mv88q2xxx_get_features,
> >  		.config_aneg		= mv88q2xxx_config_aneg,
> >  		.aneg_done		= genphy_c45_aneg_done,
> 

-- 
Kind Regards,
Niklas Söderlund