path: root/Documentation/hwmon/lm63
diff options
authorJean Delvare <>2012-01-16 22:51:46 +0100
committerJean Delvare <khali@endymion.delvare>2012-01-16 22:51:46 +0100
commit409c0b5bdf7d80e61380ce6b226b98405576d7cc (patch)
treec9c3f4d9ad0d74203599db8d77768a2676b22812 /Documentation/hwmon/lm63
parentf496b2d4f181fa5fcdf24016b11caaa33eb12477 (diff)
hwmon: (lm63) LM64 has a dedicated pin for tachometer
On the LM64, the tachometer function has a dedicated pin and fan speed monitoring is always enabled. Signed-off-by: Jean Delvare <> Acked-by: Guenter Roeck <>
Diffstat (limited to 'Documentation/hwmon/lm63')
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/hwmon/lm63 b/Documentation/hwmon/lm63
index 8202825cd095..df3e1ae42f39 100644
--- a/Documentation/hwmon/lm63
+++ b/Documentation/hwmon/lm63
@@ -54,7 +54,10 @@ value for measuring the speed of the fan. It can measure fan speeds down to
Note that the pin used for fan monitoring is shared with an alert out
function. Depending on how the board designer wanted to use the chip, fan
speed monitoring will or will not be possible. The proper chip configuration
-is left to the BIOS, and the driver will blindly trust it.
+is left to the BIOS, and the driver will blindly trust it. Only the original
+LM63 suffers from this limitation, the LM64 and LM96163 have separate pins
+for fan monitoring and alert out. On the LM64, monitoring is always enabled;
+on the LM96163 it can be disabled.
A PWM output can be used to control the speed of the fan. The LM63 has two
PWM modes: manual and automatic. Automatic mode is not fully implemented yet