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author | Alessandro Zummo <alessandro.zummo@towertech.it> | 2005-10-17 23:04:42 +0200 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2005-10-28 14:02:12 -0700 |
commit | 4d4e5ce8648561b964699afb2df5e7268a84599b (patch) | |
tree | 95d88cfc63db1e14cba71074a6108ed9a4b16737 /Documentation/i2c | |
parent | ddec748f328af6b67e4d0ce0248a8e9f36751827 (diff) | |
download | lwn-4d4e5ce8648561b964699afb2df5e7268a84599b.tar.gz lwn-4d4e5ce8648561b964699afb2df5e7268a84599b.zip |
[PATCH] i2c: New Xicor X1205 RTC driver
New driver for the Xicor X1205 RTC chip.
Signed-off-by: Alessandro Zummo <alessandro.zummo@towertech.it>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation/i2c')
-rw-r--r-- | Documentation/i2c/chips/x1205 | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/Documentation/i2c/chips/x1205 b/Documentation/i2c/chips/x1205 new file mode 100644 index 000000000000..09407c991fe5 --- /dev/null +++ b/Documentation/i2c/chips/x1205 @@ -0,0 +1,38 @@ +Kernel driver x1205 +=================== + +Supported chips: + * Xicor X1205 RTC + Prefix: 'x1205' + Addresses scanned: none + Datasheet: http://www.intersil.com/cda/deviceinfo/0,1477,X1205,00.html + +Authors: + Karen Spearel <kas11@tampabay.rr.com>, + Alessandro Zummo <a.zummo@towertech.it> + +Description +----------- + +This module aims to provide complete access to the Xicor X1205 RTC. +Recently Xicor has merged with Intersil, but the chip is +still sold under the Xicor brand. + +This chip is located at address 0x6f and uses a 2-byte register addressing. +Two bytes need to be written to read a single register, while most +other chips just require one and take the second one as the data +to be written. To prevent corrupting unknown chips, the user must +explicitely set the probe parameter. + +example: + +modprobe x1205 probe=0,0x6f + +The module supports one more option, hctosys, which is used to set the +software clock from the x1205. On systems where the x1205 is the +only hardware rtc, this parameter could be used to achieve a correct +date/time earlier in the system boot sequence. + +example: + +modprobe x1205 probe=0,0x6f hctosys=1 |