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net: phy: nxp-tja11xx: log critical health state 

TJA1102 provides interrupt notification for the critical health states
like overtemperature and undervoltage.

The overtemperature bit is set if package temperature is beyond 155C°.
This functionality was tested by heating the package up to 200C°

The undervoltage bit is set if supply voltage drops beyond some critical
threshold. Currently not tested.

In a typical use case, both of this events should be logged and stored
(or send to some remote system) for further investigations.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Oleksij Rempel 2021-08-11 08:37:12 +02:00 committed by David S. Miller
parent 445af0d259
commit e0ba60509d
1 changed files with 11 additions and 2 deletions
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13
drivers/net/phy/nxp-tja11xx.c
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@ -47,12 +47,14 @@
#define MII_INTSRC_LINK_FAIL BIT(10)
#define MII_INTSRC_LINK_UP BIT(9)
#define MII_INTSRC_MASK (MII_INTSRC_LINK_FAIL | MII_INTSRC_LINK_UP)
#define MII_INTSRC_TEMP_ERR BIT(1)
#define MII_INTSRC_UV_ERR BIT(3)
#define MII_INTSRC_TEMP_ERR BIT(1)
#define MII_INTEN 22
#define MII_INTEN_LINK_FAIL BIT(10)
#define MII_INTEN_LINK_UP BIT(9)
#define MII_INTEN_UV_ERR BIT(3)
#define MII_INTEN_TEMP_ERR BIT(1)
#define MII_COMMSTAT 23
#define MII_COMMSTAT_LINK_UP BIT(15)
@ -607,7 +609,8 @@ static int tja11xx_config_intr(struct phy_device *phydev)
if (err)
return err;
value = MII_INTEN_LINK_FAIL | MII_INTEN_LINK_UP;
value = MII_INTEN_LINK_FAIL | MII_INTEN_LINK_UP |
MII_INTEN_UV_ERR | MII_INTEN_TEMP_ERR;
err = phy_write(phydev, MII_INTEN, value);
} else {
err = phy_write(phydev, MII_INTEN, value);
@ -622,6 +625,7 @@ static int tja11xx_config_intr(struct phy_device *phydev)
static irqreturn_t tja11xx_handle_interrupt(struct phy_device *phydev)
{
struct device *dev = &phydev->mdio.dev;
int irq_status;
irq_status = phy_read(phydev, MII_INTSRC);
@ -630,6 +634,11 @@ static irqreturn_t tja11xx_handle_interrupt(struct phy_device *phydev)
return IRQ_NONE;
}
if (irq_status & MII_INTSRC_TEMP_ERR)
dev_warn(dev, "Overtemperature error detected (temp > 155C°).\n");
if (irq_status & MII_INTSRC_UV_ERR)
dev_warn(dev, "Undervoltage error detected.\n");
if (!(irq_status & MII_INTSRC_MASK))
return IRQ_NONE;