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| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2015-04-16 12:45:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-17 09:03:59 -0400 |
| commit | 7f48b21bdfede2c06e966258317a3bb4be3e4f25 (patch) | |
| tree | 97bbc064215190a72387d0607afadc92cc39c76c /Documentation | |
| parent | b0c57b5941c4a42698d845ada6a76feeba2d1be9 (diff) | |
| download | linux-7f48b21bdfede2c06e966258317a3bb4be3e4f25.tar.bz2 | |
rtc: stmp3xxx: use optional crystal in low power states
The rtc's status register allows to determine if a 32k crystal is
connected to keep the rtc running in low power states provided the
corresponding fuse bits were blown correctly during production. (In case
they were not, the right frequency can be stated in the device tree.) If
there is no such crystal available force the 24 MHz XTAL clock to keep
running to retain the right date and time. Otherwise use the crystal to
save some power.
It would be nice to only switch to the crystal when the XTAL clock is
about to be disabled and keep the crystal off when unneeded because XTAL
is always on while the chip is powered on. But as sudden power loss isn't
detectable this is not save.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
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')
| -rw-r--r-- | Documentation/devicetree/bindings/rtc/stmp3xxx-rtc.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/rtc/stmp3xxx-rtc.txt b/Documentation/devicetree/bindings/rtc/stmp3xxx-rtc.txt index b800070fe6e9..fa6a94226669 100644 --- a/Documentation/devicetree/bindings/rtc/stmp3xxx-rtc.txt +++ b/Documentation/devicetree/bindings/rtc/stmp3xxx-rtc.txt @@ -7,6 +7,11 @@ Required properties: region. - interrupts: rtc alarm interrupt +Optional properties: +- stmp,crystal-freq: override crystal frequency as determined from fuse bits. + Only <32000> and <32768> are possible for the hardware. Use <0> for + "no crystal". + Example: rtc@80056000 { |