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authorKim, Milo <Milo.Kim@ti.com>2012-10-04 17:13:45 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-06 03:05:01 +0900
commit92589c986b3360ce15d239fd5113a856412a0b3f (patch)
tree8d15272df2c445c6ccbb7b1cd79847cf89b8d94d /Documentation/rtc.txt
parent5fa44f86910ca9ee477cbd944c18f9349cdca30d (diff)
downloadlinux-linaro-stable-92589c986b3360ce15d239fd5113a856412a0b3f.tar.gz
rtc-proc: permit the /proc/driver/rtc device to use other devices
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 <milo.kim@ti.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/rtc.txt')
-rw-r--r--Documentation/rtc.txt5
1 files changed, 3 insertions, 2 deletions
diff --git a/Documentation/rtc.txt b/Documentation/rtc.txt
index 250160469d83..32aa4002de4a 100644
--- a/Documentation/rtc.txt
+++ b/Documentation/rtc.txt
@@ -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