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

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Date: Tue, 30 Jan 2024 09:18:31 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Dimitri Fedrau <dima.fedrau@...il.com>
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

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.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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