netdev - Re: [PATCH net v3 2/2] net: phy: marvell10g: hwmon support for 2110

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Message-ID: <20200423133936.GS25745@shell.armlinux.org.uk>
Date:   Thu, 23 Apr 2020 14:39:36 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Baruch Siach <baruch@...s.co.il>
Cc:     netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH net v3 2/2] net: phy: marvell10g: hwmon support for 2110

On Thu, Apr 23, 2020 at 08:08:02AM +0300, Baruch Siach wrote:
> Read the temperature sensor register from the correct location for the
> 88E2110 PHY. There is no enable/disable bit, so leave
> mv3310_hwmon_config() for 88X3310 only.
> 
> Signed-off-by: Baruch Siach <baruch@...s.co.il>
> ---
> v3: Split temperature register read routine per variant (Andrew Lunn)
> 
> v2: Fix indentation (Andrew Lunn)
> ---
>  drivers/net/phy/marvell10g.c | 25 +++++++++++++++++++++++--
>  1 file changed, 23 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/phy/marvell10g.c b/drivers/net/phy/marvell10g.c
> index 69530a84450f..e14b9c2e5efe 100644
> --- a/drivers/net/phy/marvell10g.c
> +++ b/drivers/net/phy/marvell10g.c
> @@ -66,6 +66,8 @@ enum {
>  	MV_PCS_CSSR1_SPD2_2500	= 0x0004,
>  	MV_PCS_CSSR1_SPD2_10000	= 0x0000,
>  
> +	MV_PCS_TEMP		= 0x8042,

Please add a comment mentioning that this is for the 88E2110, and
it would probably be a good idea to document the MV_V2_TEMP definition
as 88X3310 specific as well.

> +
>  	/* These registers appear at 0x800X and 0xa00X - the 0xa00X control
>  	 * registers appear to set themselves to the 0x800X when AN is
>  	 * restarted, but status registers appear readable from either.
> @@ -104,6 +106,24 @@ static umode_t mv3310_hwmon_is_visible(const void *data,
>  	return 0;
>  }
>  
> +static int mv3310_hwmon_read_temp_reg(struct phy_device *phydev)
> +{
> +	return phy_read_mmd(phydev, MDIO_MMD_VEND2, MV_V2_TEMP);
> +}
> +
> +static int mv2110_hwmon_read_temp_reg(struct phy_device *phydev)
> +{
> +	return phy_read_mmd(phydev, MDIO_MMD_PCS, MV_PCS_TEMP);
> +}
> +
> +static int mv10g_hwmon_read_temp_reg(struct phy_device *phydev)
> +{
> +	if (phydev->drv->phy_id == MARVELL_PHY_ID_88X3310)
> +		return mv3310_hwmon_read_temp_reg(phydev);
> +	else /* MARVELL_PHY_ID_88E2110 */
> +		return mv2110_hwmon_read_temp_reg(phydev);
> +}
> +
>  static int mv3310_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
>  			     u32 attr, int channel, long *value)
>  {
> @@ -116,7 +136,7 @@ static int mv3310_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
>  	}
>  
>  	if (type == hwmon_temp && attr == hwmon_temp_input) {
> -		temp = phy_read_mmd(phydev, MDIO_MMD_VEND2, MV_V2_TEMP);
> +		temp = mv10g_hwmon_read_temp_reg(phydev);
>  		if (temp < 0)
>  			return temp;
>  
> @@ -196,7 +216,8 @@ static int mv3310_hwmon_probe(struct phy_device *phydev)
>  	struct mv3310_priv *priv = dev_get_drvdata(&phydev->mdio.dev);
>  	int i, j, ret;
>  
> -	if (phydev->drv->phy_id != MARVELL_PHY_ID_88X3310)
> +	if (phydev->drv->phy_id != MARVELL_PHY_ID_88X3310 &&
> +	    phydev->drv->phy_id != MARVELL_PHY_ID_88E2110)
>  		return 0;

Doesn't that mean this condition can be removed, as this can only be
reached when one of those conditions is true?

>  
>  	priv->hwmon_name = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);
> -- 
> 2.26.1
> 
> 

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