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hwmon: (lm85) Add support for ADT7468 high-frequency PWM mode

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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 <[email protected]>
Cc: Darrick J. Wong <[email protected]>
Acked-by: Guenter Roeck <[email protected]>
This commit is contained in:
Jean Delvare 2010-10-28 20:31:50 +02:00 • committed by Jean Delvare
commit f6c61cff8b
2 changed files with 35 additions and 7 deletions
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7
Documentation/hwmon/lm85
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@ -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