From 4d4e5ce8648561b964699afb2df5e7268a84599b Mon Sep 17 00:00:00 2001 From: Alessandro Zummo Date: Mon, 17 Oct 2005 23:04:42 +0200 Subject: [PATCH] i2c: New Xicor X1205 RTC driver New driver for the Xicor X1205 RTC chip. Signed-off-by: Alessandro Zummo Signed-off-by: Jean Delvare Signed-off-by: Greg Kroah-Hartman --- Documentation/i2c/chips/x1205 | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 Documentation/i2c/chips/x1205 (limited to 'Documentation') diff --git a/Documentation/i2c/chips/x1205 b/Documentation/i2c/chips/x1205 new file mode 100644 index 0000000..09407c9 --- /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 , + Alessandro Zummo + +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 -- cgit v1.1