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-rw-r--r--Documentation/hwmon/lm9012
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/hwmon/lm90 b/Documentation/hwmon/lm90
index 08106ad7089c..6a03dd4bcc94 100644
--- a/Documentation/hwmon/lm90
+++ b/Documentation/hwmon/lm90
@@ -173,6 +173,18 @@ The lm90 driver will not update its values more frequently than every
other second; reading them more often will do no harm, but will return
'old' values.
+SMBus Alert Support
+-------------------
+
+This driver has basic support for SMBus alert. When an alert is received,
+the status register is read and the faulty temperature channel is logged.
+
+The Analog Devices chips (ADM1032 and ADT7461) do not implement the SMBus
+alert protocol properly so additional care is needed: the ALERT output is
+disabled when an alert is received, and is re-enabled only when the alarm
+is gone. Otherwise the chip would block alerts from other chips in the bus
+as long as the alarm is active.
+
PEC Support
-----------
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