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@xxxxxxxxxxxxxx>
---
drivers/net/phy/nxp-tja11xx.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/net/phy/nxp-tja11xx.c b/drivers/net/phy/nxp-tja11xx.c
index afd7afa1f498..9944cc501806 100644
--- a/drivers/net/phy/nxp-tja11xx.c
+++ b/drivers/net/phy/nxp-tja11xx.c
@@ -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;
--
2.30.2
