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Diffstat (limited to 'Documentation/i2c/chips')
-rw-r--r-- | Documentation/i2c/chips/x1205 | 38 |
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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 | |||
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1 | Kernel driver x1205 | ||
2 | =================== | ||
3 | |||
4 | Supported chips: | ||
5 | * Xicor X1205 RTC | ||
6 | Prefix: 'x1205' | ||
7 | Addresses scanned: none | ||
8 | Datasheet: http://www.intersil.com/cda/deviceinfo/0,1477,X1205,00.html | ||
9 | |||
10 | Authors: | ||
11 | Karen Spearel <kas11@tampabay.rr.com>, | ||
12 | Alessandro Zummo <a.zummo@towertech.it> | ||
13 | |||
14 | Description | ||
15 | ----------- | ||
16 | |||
17 | This module aims to provide complete access to the Xicor X1205 RTC. | ||
18 | Recently Xicor has merged with Intersil, but the chip is | ||
19 | still sold under the Xicor brand. | ||
20 | |||
21 | This chip is located at address 0x6f and uses a 2-byte register addressing. | ||
22 | Two bytes need to be written to read a single register, while most | ||
23 | other chips just require one and take the second one as the data | ||
24 | to be written. To prevent corrupting unknown chips, the user must | ||
25 | explicitely set the probe parameter. | ||
26 | |||
27 | example: | ||
28 | |||
29 | modprobe x1205 probe=0,0x6f | ||
30 | |||
31 | The module supports one more option, hctosys, which is used to set the | ||
32 | software clock from the x1205. On systems where the x1205 is the | ||
33 | only hardware rtc, this parameter could be used to achieve a correct | ||
34 | date/time earlier in the system boot sequence. | ||
35 | |||
36 | example: | ||
37 | |||
38 | modprobe x1205 probe=0,0x6f hctosys=1 | ||