linux-kernel - Re: [PATCH v5 net-next 08/13] net: phy: marvell-88q2xxx: add support for temperature sensor

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Message-ID: <20240131115211.GA111590@debian>
Date: Wed, 31 Jan 2024 12:52:11 +0100
From: Dimitri Fedrau <dima.fedrau@...il.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Jean Delvare <jdelvare@...e.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Stefan Eichenberger <eichest@...il.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org
Subject: Re: [PATCH v5 net-next 08/13] net: phy: marvell-88q2xxx: add support
 for temperature sensor

Am Tue, Jan 30, 2024 at 09:18:31AM +0000 schrieb Russell King (Oracle):
> On Mon, Jan 22, 2024 at 10:28:41PM +0100, Dimitri Fedrau wrote:
> 
> 	int tmp;
> 
> > +	switch (attr) {
> > +	case hwmon_temp_input:
> > +		ret = phy_read_mmd(phydev, MDIO_MMD_PCS,
> > +				   MDIO_MMD_PCS_MV_TEMP_SENSOR3);
> > +		if (ret < 0)
> > +			return ret;
> > +
> > +		*val = ((ret & MDIO_MMD_PCS_MV_TEMP_SENSOR3_MASK) - 75) * 1000;
> 
> 		tmp = FIELD_GET(MDIO_MMD_PCS_MV_TEMP_SENSOR3_MASK, ret);
> 		*val = (tmp - 75) * 1000;
> 
> > +		return 0;
> > +	case hwmon_temp_max:
> > +		ret = phy_read_mmd(phydev, MDIO_MMD_PCS,
> > +				   MDIO_MMD_PCS_MV_TEMP_SENSOR3);
> > +		if (ret < 0)
> > +			return ret;
> > +
> > +		*val = (((ret & MDIO_MMD_PCS_MV_TEMP_SENSOR3_INT_THRESH_MASK) >>
> > +			MDIO_MMD_PCS_MV_TEMP_SENSOR3_INT_THRESH_SHIFT) - 75) *
> > +			1000;
> 
> 		tmp = FIELD_GET(MDIO_MMD_PCS_MV_TEMP_SENSOR3_INT_THRESH_MASK,
> 				ret);
> 		*val = (tmp - 75) * 1000;
> 
> > +		return 0;
> > +	case hwmon_temp_alarm:
> > +		ret = phy_read_mmd(phydev, MDIO_MMD_PCS,
> > +				   MDIO_MMD_PCS_MV_TEMP_SENSOR1);
> > +		if (ret < 0)
> > +			return ret;
> > +
> > +		*val = !!(ret & MDIO_MMD_PCS_MV_TEMP_SENSOR1_RAW_INT);
> > +		return 0;
> > +	default:
> > +		return -EOPNOTSUPP;
> > +	}
> > +}
> > +
> > +static int mv88q2xxx_hwmon_write(struct device *dev,
> > +				 enum hwmon_sensor_types type, u32 attr,
> > +				 int channel, long val)
> > +{
> > +	struct phy_device *phydev = dev_get_drvdata(dev);
> > +
> > +	switch (attr) {
> > +	case hwmon_temp_max:
> > +		if (val < -75000 || val > 180000)
> > +			return -EINVAL;
> > +
> > +		val = ((val / 1000) + 75) <<
> > +		       MDIO_MMD_PCS_MV_TEMP_SENSOR3_INT_THRESH_SHIFT;
> 
> 		val = (val / 1000) + 75;
> 		val = FIELD_PREP(MDIO_MMD_PCS_MV_TEMP_SENSOR3_INT_THRESH_MASK,
> 				 val);
> 
> ... and therefore no need for the _SHIFT constants.
>
Will fix it.
> -- 
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!