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rtc-proc: permit the /proc/driver/rtc device to use other devices

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To get time information via /proc/driver/rtc, only the first device (rtc0)
is used.  If the rtcN (eg.  rtc1 or rtc2) is used for the system clock,
there is no way to get information of rtcN via /proc/driver/rtc.  With
this patch, the time data can be retrieved from the system clock RTC.

If the RTC_HCTOSYS_DEVICE is not defined, then rtc0 is used by default.

Signed-off-by: Milo(Woogyom) Kim <[email protected]>
Cc: Alessandro Zummo <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Kim, Milo 2012-10-04 17:13:45 -07:00 • committed by Linus Torvalds
commit 92589c986b
3 changed files with 31 additions and 8 deletions
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5
Documentation/rtc.txt
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@ -119,8 +119,9 @@ three different userspace interfaces:
* /sys/class/rtc/rtcN ... sysfs attributes support readonly
access to some RTC attributes.
* /proc/driver/rtc ... the first RTC (rtc0) may expose itself
using a procfs interface. More information is (currently) shown
* /proc/driver/rtc ... the system clock RTC may expose itself
using a procfs interface. If there is no RTC for the system clock,
rtc0 is used by default. More information is (currently) shown
here than through sysfs.
The RTC Class framework supports a wide variety of RTCs, ranging from those