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Mark Brown 35c86bf66d rtc: Add support for RTCs on Wolfson WM831x devices 
The WM831x series of PMICs contain RTC functionality. The hardware
provides a 32 bit counter incrementing at 1Hz together with a per
tick interrupt and an alarm value. For simplicity the driver chooses
to define the epoch for the counter as the Unix epoch - if required
platform data can be used in future to customise this.

When powered on from a completely cold state the RTC reports that it
has not been configured - when this happens an error is returned
when attempting to read the RTC in order to avoid use of values we
know to be invalid.

The hardware also provides security features which mean that it can
ignore attempts to set the RTC time in certain circumstances, most
notably if the RTC is written to too often. These errors are detected
by verifying the written RTC value.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2009-09-17 09:47:13 +02:00
..
accessibility
acpi Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2009-09-16 07:49:54 -07:00
amba Merge branches 'arm', 'at91', 'bcmring', 'ep93xx', 'mach-types', 'misc' and 'w90x900' into devel 2009-09-12 12:01:34 +01:00
ata pata_rz1000: use printk_once 2009-09-11 02:33:59 -04:00
atm
auxdisplay
base Driver Core: devtmpfs - kernel-maintained tmpfs-based /dev 2009-09-15 09:50:49 -07:00
block Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6 2009-09-16 08:27:10 -07:00
bluetooth pcmcia: dtl1_cs: fix pcmcia_loop_config logic 2009-09-15 10:17:16 -07:00
cdrom
char Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6 2009-09-16 08:27:10 -07:00
clocksource
connector
cpufreq Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2009-09-15 09:39:44 -07:00
cpuidle
crypto
dca
dio
dma at_hdmac: Rework suspend_late()/resume_early() 2009-09-14 20:27:00 +02:00
edac EDAC, AMD: decode FR MCEs 2009-09-14 19:01:37 +02:00
eisa
firewire driver model: constify attribute groups 2009-09-15 09:50:47 -07:00
firmware driver model: constify attribute groups 2009-09-15 09:50:47 -07:00
gpio gpio: Add WM831X GPIO driver 2009-09-17 09:47:01 +02:00
gpu PCI/vgaarb: cleanup some warnings + cleanup some comments. 2009-09-09 13:29:41 -07:00
hid Merge branches 'upstream', 'upstream-fixes' and 'debugfs' into for-linus 2009-09-13 20:09:41 +02:00
hwmon hwmon: WM831x PMIC hardware monitoring driver 2009-09-17 09:47:02 +02:00
i2c
ide Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide-next-2.6 2009-09-15 10:01:16 -07:00
idle
ieee1394
ieee802154
infiniband driver model: constify attribute groups 2009-09-15 09:50:47 -07:00
input input: PCAP2 misc input driver 2009-09-17 09:47:12 +02:00
isdn
leds
lguest
macintosh Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2009-09-15 09:51:09 -07:00
mca
md Merge branch 'for-2.6.32' of git://git.kernel.dk/linux-2.6-block 2009-09-14 17:55:15 -07:00
media Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6 2009-09-15 09:22:18 -07:00
memstick
message Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2009-09-14 17:53:36 -07:00
mfd mfd: Hook WM831x into build system 2009-09-17 09:47:00 +02:00
misc hpilo: add poll f_op 2009-09-15 09:50:48 -07:00
mmc driver model: constify attribute groups 2009-09-15 09:50:47 -07:00
mtd Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6 2009-09-16 08:27:10 -07:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6 2009-09-16 08:27:10 -07:00
nubus
of
oprofile
parisc
parport
pci Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2009-09-16 07:49:54 -07:00
pcmcia Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/pcmcia-2.6 2009-09-16 08:11:23 -07:00
platform hp-wmi: Switch driver to dev_pm_ops 2009-09-14 20:26:59 +02:00
pnp
power
pps
ps3 powerpc/ps3: Workaround for flash memory I/O error 2009-09-11 11:28:00 +10:00
rapidio
regulator regulator: get pcap data from the parent device 2009-09-17 09:47:13 +02:00
rtc rtc: Add support for RTCs on Wolfson WM831x devices 2009-09-17 09:47:13 +02:00
s390 driver model: constify attribute groups 2009-09-15 09:50:47 -07:00
sbus
scsi driver model: constify attribute groups 2009-09-15 09:50:47 -07:00
serial Merge branch 'master' into devel 2009-09-12 12:04:37 +01:00
sh
sn
spi Merge branch 'master' into devel 2009-09-12 12:04:37 +01:00
ssb ssb: Implement SDIO host bus support 2009-09-09 11:19:00 -04:00
staging Staging: remove sxg driver 2009-09-15 12:02:35 -07:00
tc
telephony
thermal
uio uio: add generic driver for PCI 2.3 devices 2009-09-15 09:50:48 -07:00
usb debugfs: Modified default dir of debugfs for debugging UHCI. 2009-09-15 09:50:49 -07:00
uwb driver model: constify attribute groups 2009-09-15 09:50:47 -07:00
video Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2009-09-16 07:49:54 -07:00
virtio
vlynq
w1
watchdog
xen Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2009-09-15 09:39:44 -07:00
zorro
Kconfig
Makefile