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authorJean Delvare <khali@linux-fr.org>2010-10-28 20:31:50 +0200
committerJean Delvare <khali@endymion.delvare>2010-10-28 20:31:50 +0200
commit6dfee85397a47063291fe199eaf950bee7944454 (patch)
treea0938da1f748f16621238e047a93f052fbd9adb2 /Documentation
parent4275fcd65d3b4a504b7779e532c81a927afd28c0 (diff)
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hwmon: (pcf8591) Don't attempt to detect devices
The PCF8591 can't be detected, don't even try. There are plenty of other means to instantiate i2c devices these days. Signed-off-by: Jean Delvare <khali@linux-fr.org> Reviewed-by: Guenter Roeck <guenter.roeck@ericsson.com> Cc: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/hwmon/pcf859118
1 files changed, 8 insertions, 10 deletions
diff --git a/Documentation/hwmon/pcf8591 b/Documentation/hwmon/pcf8591
index e76a7892f68..ac020b3bb7b 100644
--- a/Documentation/hwmon/pcf8591
+++ b/Documentation/hwmon/pcf8591
@@ -4,7 +4,7 @@ Kernel driver pcf8591
Supported chips:
* Philips/NXP PCF8591
Prefix: 'pcf8591'
- Addresses scanned: I2C 0x48 - 0x4f
+ Addresses scanned: none
Datasheet: Publicly available at the NXP website
http://www.nxp.com/pip/PCF8591_6.html
@@ -58,18 +58,16 @@ Module parameters
Accessing PCF8591 via /sys interface
-------------------------------------
-! Be careful !
-The PCF8591 is plainly impossible to detect! Stupid chip.
-So every chip with address in the interval [0x48..0x4f] is
-detected as PCF8591. If you have other chips in this address
-range, the workaround is to load this module after the one
-for your others chips.
+The PCF8591 is plainly impossible to detect! Thus the driver won't even
+try. You have to explicitly instantiate the device at the relevant
+address (in the interval [0x48..0x4f]) either through platform data, or
+using the sysfs interface. See Documentation/i2c/instantiating-devices
+for details.
-On detection (i.e. insmod, modprobe et al.), directories are being
-created for each detected PCF8591:
+Directories are being created for each instantiated PCF8591:
/sys/bus/i2c/devices/<0>-<1>/
-where <0> is the bus the chip was detected on (e. g. i2c-0)
+where <0> is the bus the chip is connected to (e. g. i2c-0)
and <1> the chip address ([48..4f])
Inside these directories, there are such files: