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

From: Dimitri Fedrau <[email-masked]>
Date: Thu, 1 Feb 2024 17:14:35 +0100

Am Thu, Feb 01, 2024 at 05:34:05AM -0800 schrieb Guenter Roeck:
> On 1/31/24 23:11, Dimitri Fedrau wrote:
> > Am Wed, Jan 31, 2024 at 04:17:06PM +0100 schrieb Andrew Lunn:
> > > > +static int mv88q2xxx_hwmon_probe(struct phy_device *phydev)
> > > > +{
> > > > +	struct device *dev = &phydev->mdio.dev;
> > > > +	struct device *hwmon;
> > > > +	char *hwmon_name;
> > > > +	int ret;
> > > > +
> > > > +	/* Enable temperature sensor interrupt */
> > > > +	ret = phy_set_bits_mmd(phydev, MDIO_MMD_PCS,
> > > > +			       MDIO_MMD_PCS_MV_TEMP_SENSOR1,
> > > > +			       MDIO_MMD_PCS_MV_TEMP_SENSOR1_INT_EN);
> > > 
> > > You enable an interrupt, but i don't see any changes to the interrupt
> > > handler to handle any interrupts which are generated?
> > > 
> > Hi Andrew,
> > 
> > you are right. Have to remove these lines. Besides enabling the interrupt
> > in MDIO_MMD_PCS_MV_TEMP_SENSOR1, there are two further register writes
> > necessary to make the interrupt propagate. I didn't want it to propagate.
> > Anyway it's wrong. I couldn't find a good solution to use the temperature
> > interrupt. Will have a look into this, and probably figuring out how to
> > do so. But it won't be part of this patch series.
> > 
> 
> From hwmon perspective, the expected use of such an interrupt would be
> to call hwmon_notify_event() with the affected limit attribute as argument.
> This would notify the thermal subsystem if the sensor is registered with it
> (your patch doesn't set the necessary flag when registering the driver,
> so this would not happen), it will send a notification to the sysfs
> attribute, and generate a udev event.
>
Thanks, noted it down. Didn't know about the notification to the thermal
subsystem and the generated udev event. :)

Dimitri