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authorJean Delvare <khali@linux-fr.org>2007-10-13 17:56:31 -0400
committerJean Delvare <khali@hyperion.delvare>2007-10-13 17:56:31 -0400
commit553515e5c54dbf3340cd6773aaf0acb53291d6ad (patch)
tree604b27ffd6452b925c4f2433e55fec60f755e44b /Documentation/i2c
parent95a7f10eadcd88cfd6640e44c7b8cf9ac1afafe7 (diff)
i2c/pcf8574: No arbitrary initialization
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 <khali@linux-fr.org> Acked-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'Documentation/i2c')
-rw-r--r--Documentation/i2c/chips/pcf85748
1 files changed, 3 insertions, 5 deletions
diff --git a/Documentation/i2c/chips/pcf8574 b/Documentation/i2c/chips/pcf8574
index 2752c8ce3167..5c1ad1376b62 100644
--- a/Documentation/i2c/chips/pcf8574
+++ b/Documentation/i2c/chips/pcf8574
@@ -62,8 +62,6 @@ if the corresponding output is set as 1, otherwise the current output
62value, that is to say 0. 62value, that is to say 0.
63 63
64The write file is read/write. Writing a value outputs it on the I/O 64The write file is read/write. Writing a value outputs it on the I/O
65port. Reading returns the last written value. 65port. Reading returns the last written value. As it is not possible
66 66to read this value from the chip, you need to write at least once to
67On module initialization the chip is configured as eight inputs (all 67this file before you can read back from it.
68outputs to 1), so you can connect any circuit to the PCF8574(A) without
69being afraid of short-circuit.