path: root/Documentation/i2c
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authorAlessandro Zummo <alessandro.zummo@towertech.it>2005-10-17 23:04:42 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2005-10-28 14:02:12 -0700
commit4d4e5ce8648561b964699afb2df5e7268a84599b (patch)
tree95d88cfc63db1e14cba71074a6108ed9a4b16737 /Documentation/i2c
parentddec748f328af6b67e4d0ce0248a8e9f36751827 (diff)
[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')
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
+ Karen Spearel <kas11@tampabay.rr.com>,
+ Alessandro Zummo <a.zummo@towertech.it>
+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.
+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.
+modprobe x1205 probe=0,0x6f hctosys=1