This adds all (according to the data sheet) missing register and bit
definitions.
It also fixes the definition of the trickle charger bit masks.
Signed-off-by: NMichael Buesch <m@bues.ch>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

The C2 suffix does not appear in the latest datasheet, so add
a device ID without it.
Signed-off-by: NMichael Buesch <m@bues.ch>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

The C2 suffix does not appear anymore in the latest device and
data sheet versions.
Signed-off-by: NMichael Buesch <m@bues.ch>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

There are several arch-specific RTC drivers that can be successfully
compiled on other platforms. Add a COMPILE_TEST dependency for those.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: NGeert Uytterhoeven <geert@linux-m68k.org>

There are four architectures using this driver, but since we can
build it with COMPILE_TEST, we should try dealing with the absence
of the asm/rtc.h header file, to avoid getting a build error:

drivers/rtc/rtc-generic.c:12:21: fatal error: asm/rtc.h: No such file or directory

This creates an alternative use of the driver, allowing architectures
to pass a set of rtc_class_ops in platform data. We can convert the
four architectures to use this and then remove the original
code.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

The time and date register of the pcf8223 are undefined after a power
reset. Properly handle the OS bit and return -EINVAL when that bit is set.

It is properly removed when setting the time.

This solves an issue where the time and date may be valid for
rtc_valid_tm() but is not the current time.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

No members of struct pcf85063 are used anymore, remove the whole structure.
Reviewed-by: NJuergen Borleis <jbe@pengutronix.de>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Since the driver is mainlined there is no use for a separate version
number.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Always show there is an I2C section, like the other sections.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

We call spin_lock_irqrestore with "flags" set to zero instead of to the
value from spin_lock_irqsave().

Fixes: aaaf5fbf ('rtc: add driver for DS1685 family of real time clocks')
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Use macro REGMAP_IRQ_REG from regmap.h to initialise the
regmap irq table for max77686 to have better coding style
and improve readability.
Signed-off-by: NLaxman Dewangan <ldewangan@nvidia.com>
Reviewed-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Maxim Semiconductor's PMIC MAX77686 has RTC IP which is
reused in the MAX77620/MAX20024 PMICs.

Add support for these devices in MAX77686 RTC driver. This
device does not have RTC alarm pending status outside of
RTC IP. The RTC IP is having separate I2C address for its
register access.
Signed-off-by: NLaxman Dewangan <ldewangan@nvidia.com>
Reviewed-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

The driver uses the MODULE_ALIAS() macro to export a platform module alias
to allow the module to be autoloaded if the device is registered using the
legacy platform registration mechanism but the driver is always used by OF
only machines so the alias is not needed and should just be removed.
Suggested-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NJavier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

pcf85063_get_datetime() tries to handle a century bit but that bit is not
documented and the final value is never used anywhere else in the kernel.
Reviewed-by: NJuergen Borleis <jbe@pengutronix.de>
Tested-by: NUlrich Ölmann <u.oelmann@pengutronix.de>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

drivers/rtc/rtc-vr41xx.c:229: warning: ‘vr41xx_rtc_alarm_irq_enable’ defined but not used

Apparently the conversion to alarm_irq_enable forgot to wire up the
callback.

Fixes: 16380c15 ("RTC: Convert rtc drivers to use the alarm_irq_enable method")
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

The Kconfig option for rv3029 is not mentioning any part number, explicitly
show rv3029.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

as3722 RTC IRQ is nested threaded and wired to the as3722 inerrupt
controller. So, this flag is not required for nested irqs anymore,
since commit 3c646f2c ("genirq: Don't suspend nested_thread irqs
over system suspend") was merged.

Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Nishanth Menon <nm@ti.com>
Cc: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: NGrygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

tps80031 RTC IRQ is nested threaded and wired to the tps80031
inerrupt controller. So, this flag is not required for nested irqs
anymore, since commit 3c646f2c ("genirq: Don't suspend
nested_thread irqs over system suspend") was merged.

Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Nishanth Menon <nm@ti.com>
Signed-off-by: NGrygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

tps65910 RTC IRQ is nested threaded and wired to the tps65910 inerrupt
controller. So, this flag is not required for nested irqs anymore,
since commit 3c646f2c ("genirq: Don't suspend nested_thread irqs
over system suspend") was merged.

Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Nishanth Menon <nm@ti.com>
Cc: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: NGrygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

tps6586x RTC IRQ is nested threaded and wired to the tps6586x inerrupt
controller. So, this flag is not required for nested irqs anymore,
since commit 3c646f2c ("genirq: Don't suspend nested_thread irqs
over system suspend") was merged.

Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Nishanth Menon <nm@ti.com>
Cc: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: NGrygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Palams RTC IRQ is nested threaded and wired to the Palmas inerrupt
controller. So, this flag is not required for nested irqs anymore,
since commit 3c646f2c ("genirq: Don't suspend nested_thread irqs
over system suspend") was merged.

Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Nishanth Menon <nm@ti.com>
Signed-off-by: NGrygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

The RTC entries are mostly grouped by vendor. Move the few outliers in
place.
Also, change the one occurrence of 'nxp' to 'NXP' to make all NXP
entries consistent.
Signed-off-by: NSoren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

This driver adds support for the PIC32 real time clock and calendar
peripheral:
	- reading and setting time
	- alarms provided by dedicated IRQ
Signed-off-by: NJoshua Henderson <joshua.henderson@microchip.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Document the devicetree bindings for the real time clock found
on Microchip PIC32 class devices.
Signed-off-by: NJoshua Henderson <joshua.henderson@microchip.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

The alarm for rx8025 only has a minute accuracy, so unsupport UIE mode.

pcf8563 and hym8563 also have a minute accuracy and unsupport it.
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

The alarm for rx8025 only has a minute accuracy, so round up to nearest
minute when setting alarm.  Without doing this, rtctest blocks one day
after setting alarm to 5 seconds later.

pcf8563 and hym8563 also have similar handling.
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

The ctrl1 register is accessed by alarm operations.  But it is updated
in threaded interrupt handler without acquiring rtc->ops_lock.
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

When IRQ line for this chips is connected, devm_request_threaded_irq()
refuses to register irq handler with the following message.

genirq: Threaded irq requested with handler=NULL and !ONESHOT for irq
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Few functions were marked inline even though they were relatively large
and sometimes used in multiple places. De-inline them to let the
compiler decide whether optimization makes sense. This fixes inline_hunt
report:
drivers/rtc/rtc-s5m.c: Deinline s5m8767_rtc_set_alarm_reg, save 704 bytes
drivers/rtc/rtc-s5m.c: Deinline s5m8767_wait_for_udr_update, save 192 bytes
Reported-by: NDenys Vlasenko <vda.linux@googlemail.com>
Cc: Denys Vlasenko <vda.linux@googlemail.com>
Signed-off-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: NJavier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

The Makefile/Kconfig currently controlling compilation of this code is:

obj-$(CONFIG_RTC_CLASS)         += rtc-core.o
rtc-core-y                      := class.o interface.o

drivers/rtc/Kconfig:menuconfig RTC_CLASS
drivers/rtc/Kconfig:    bool "Real Time Clock"

...meaning that it currently is not being built as a module by anyone.

Lets remove the modular code that is essentially orphaned, so that
when reading the code there is no doubt it is builtin-only.

We don't replace module.h with init.h since the file does need
to know what a struct module is.

We also delete the MODULE_LICENSE tag etc. since all that information
is already contained at the top of the file in the comments.
Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

When setting a new time/date the RTC's clock must be stopped first, in
order to write the time/date registers in an atomic manner.
So, this change stops the clock first and then writes the time/date
registers and the clock control register (to re-enable the clock) in one
turn.
Signed-off-by: NJuergen Borleis <jbe@pengutronix.de>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Check if the RTC signals an invalid time/date (due to a battery power loss
for example). In this case ignore the time/date until it is really set again.
Signed-off-by: NJuergen Borleis <jbe@pengutronix.de>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

By using i2c_smbus_read_i2c_block_data() the code is now much simpler.

While at it: when reading the RTC's seconds register, all time/date registers
are frozen until the RTC's year register is read. So it is important to read
all time/date registers in one turn to not lose a second event. Make it more
clear why the read must happen in this way.
Signed-off-by: NJuergen Borleis <jbe@pengutronix.de>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

pcf2123 has an offset register, which can be used to make minor
adjustments to the clock rate to compensate for temperature or
a crystal that is not exactly right.
Signed-off-by: NJoshua Clayton <stillcompiling@gmail.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

clock offset may be set and read in decimal parts per billion
attribute is /sys/class/rtc/rtcN/offset
The attribute is only visible for rtcs that have set_offset implemented.
Signed-off-by: NJoshua Clayton <stillcompiling@gmail.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

A number of rtc devices, such as the NXP pcf2123 include a facility
to adjust the clock in order to compensate for temperature or a
crystal, capacitor, etc, that results in the rtc clock not running
at exactly 32.768 kHz.

Data sheets I have seen refer to this as a clock offset, and measure it
in parts per million, however they often reference ppm to 2 digits of
precision, which makes integer ppm less than ideal.

We use parts per billion, which more than covers the precision needed
and works nicely within 32 bits
Signed-off-by: NJoshua Clayton <stillcompiling@gmail.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Fix a scheduling while atomic issue caused by rv8803_set_time()
holding a spinlock during the call to i2c_smbus_read_byte_data().
Signed-off-by: NOleksij Rempel <fixed-term.Oleksij.Rempel@de.bosch.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Document Alphascale asm9260 RTC bindings
Signed-off-by: NOleksij Rempel <linux@rempel-privat.de>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

Add support for RTC controller found on Alphascale asm9260
SoC.
Signed-off-by: NOleksij Rempel <linux@rempel-privat.de>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>

DS3231 has programmable square-wave output signal.
This enables to use this feature as a clock provider of
common clock framework.
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Reviewed-by: NMichael Turquette <mturquette@baylibre.com>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>