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| author | Jean Delvare <khali@linux-fr.org> | 2010-10-28 20:31:50 +0200 |
|---|---|---|
| committer | Jean Delvare <khali@endymion.delvare> | 2010-10-28 20:31:50 +0200 |
| commit | f6c61cff8bcb58b8dfb645d4243a049908c02024 (patch) | |
| tree | bff2919dcf335f38cb36bdbd27fd5c5870e4b0e9 /Documentation/hwmon/lm85 | |
| parent | c36364dbf38382ef6be2fb99a3ce361a679c0ecb (diff) | |
| download | lwn-f6c61cff8bcb58b8dfb645d4243a049908c02024.tar.gz lwn-f6c61cff8bcb58b8dfb645d4243a049908c02024.zip | |
hwmon: (lm85) Add support for ADT7468 high-frequency PWM mode
The ADT7468 supports a high-frequency PWM output mode where all PWM
outputs are driven by a 22.5 kHz clock. Add support for this mode, and
document it, as it may surprise the user that setting one PWM output
frequency also affects the other PWM outputs.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Darrick J. Wong <djwong@us.ibm.com>
Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
Diffstat (limited to 'Documentation/hwmon/lm85')
| -rw-r--r-- | Documentation/hwmon/lm85 | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/hwmon/lm85 b/Documentation/hwmon/lm85 index 83cd5bb1ac79..239258a63c81 100644 --- a/Documentation/hwmon/lm85 +++ b/Documentation/hwmon/lm85 @@ -101,6 +101,13 @@ Devices has confirmed this "bug". The ADT7463 is reported to work as described in the documentation. The current lm85 driver does not show the offset register. +The ADT7468 has a high-frequency PWM mode, where all PWM outputs are +driven by a 22.5 kHz clock. This is a global mode, not per-PWM output, +which means that setting any PWM frequency above 11.3 kHz will switch +all 3 PWM outputs to a 22.5 kHz frequency. Conversely, setting any PWM +frequency below 11.3 kHz will switch all 3 PWM outputs to a frequency +between 10 and 100 Hz, which can then be tuned separately. + See the vendor datasheets for more information. There is application note from National (AN-1260) with some additional information about the LM85. The Analog Devices datasheet is very detailed and describes a procedure for |