Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/shaggy...

[sfrench/cifs-2.6.git] / Documentation / hwmon / it87

diff --git a/Documentation/hwmon/it87 b/Documentation/hwmon/it87
index e783fd62e3085a5abb7a965d83fa3b462d990e8d..c0528d6f9aceb9e8066533f3821315d1a4c55679 100644 (file)
--- a/Documentation/hwmon/it87
+++ b/Documentation/hwmon/it87
@@ -9,8 +9,7 @@ Supported chips:
                http://www.ite.com.tw/
   * IT8712F
     Prefix: 'it8712'
-    Addresses scanned: I2C 0x2d
-                       from Super I/O config space (8 I/O ports)
+    Addresses scanned: from Super I/O config space (8 I/O ports)
     Datasheet: Publicly available at the ITE website
                http://www.ite.com.tw/
   * IT8716F
@@ -53,6 +52,18 @@ Module Parameters
   misconfigured by BIOS - PWM values would be inverted. This option tries
   to fix this. Please contact your BIOS manufacturer and ask him for fix.
 
+
+Hardware Interfaces
+-------------------
+
+All the chips suported by this driver are LPC Super-I/O chips, accessed
+through the LPC bus (ISA-like I/O ports). The IT8712F additionally has an
+SMBus interface to the hardware monitoring functions. This driver no
+longer supports this interface though, as it is slower and less reliable
+than the ISA access, and was only available on a small number of
+motherboard models.
+
+
 Description
 -----------
 
@@ -124,6 +135,16 @@ Give 0 for unused sensor. Any other value is invalid. To configure this at
 startup, consult lm_sensors's /etc/sensors.conf. (2 = thermistor;
 3 = thermal diode)
 
+
+Fan speed control
+-----------------
+
 The fan speed control features are limited to manual PWM mode. Automatic
 "Smart Guardian" mode control handling is not implemented. However
 if you want to go for "manual mode" just write 1 to pwmN_enable.
+
+If you are only able to control the fan speed with very small PWM values,
+try lowering the PWM base frequency (pwm1_freq). Depending on the fan,
+it may give you a somewhat greater control range. The same frequency is
+used to drive all fan outputs, which is why pwm2_freq and pwm3_freq are
+read-only.