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i2c/pcf8574: No arbitrary initialization

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Do not initialize the PCF8574 with an arbitrary value. Users will have
to write the initial value to sysfs themselves.

Signed-off-by: Jean Delvare <[email protected]>
Acked-by: Aurelien Jarno <[email protected]>
This commit is contained in:
Jean Delvare 2007-10-13 23:56:31 +02:00 • committed by Jean Delvare
commit 553515e5c5
2 changed files with 10 additions and 12 deletions
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8
Documentation/i2c/chips/pcf8574
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@ -62,8 +62,6 @@ if the corresponding output is set as 1, otherwise the current output
value, that is to say 0.
The write file is read/write. Writing a value outputs it on the I/O
port. Reading returns the last written value.
On module initialization the chip is configured as eight inputs (all
outputs to 1), so you can connect any circuit to the PCF8574(A) without
being afraid of short-circuit.
port. Reading returns the last written value. As it is not possible
to read this value from the chip, you need to write at least once to
this file before you can read back from it.