aboutsummaryrefslogtreecommitdiff
path: root/Documentation/i2c/chips/x1205
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/i2c/chips/x1205')
-rw-r--r--Documentation/i2c/chips/x120538
1 files changed, 38 insertions, 0 deletions
diff --git a/Documentation/i2c/chips/x1205 b/Documentation/i2c/chips/x1205
new file mode 100644
index 00000000000..09407c991fe
--- /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