The current implementation of rtc_time64_to_tm() contains unnecessary
loops, branches and look-up tables. The new one uses an arithmetic-based
algorithm appeared in [1] and is approximately 4.3 times faster (YMMV).
The drawback is that the new code isn't intuitive and contains many 'magic
numbers' (not unusual for this type of algorithm). However, [1] justifies
all those numbers and, given this function's history, the code is unlikely
to need much maintenance, if any at all.
Add a KUnit test case that checks every day in a 160,000 years interval
starting on 1970-01-01 against the expected result. Add a new config
RTC_LIB_KUNIT_TEST symbol to give the option to run this test suite.
[1] Neri, Schneider, "Euclidean Affine Functions and Applications to
Calendar Algorithms". https://arxiv.org/abs/2102.06959
Signed-off-by: Cassio Neri <cassio.neri@gmail.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210624201343.85441-1-cassio.neri@gmail.com
With this driver, mainline Linux can keep its time and date in sync with
the vendor kernel.
Advanced functionality like alarm and automatic power-on is not yet
supported.
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Intel Moorestown and Medfield are quite old Intel Atom based
32-bit platforms, which were in limited use in some Android phones,
tablets and consumer electronics more than eight years ago.
There are no bugs or problems ever reported outside from Intel
for breaking any of that platforms for years. It seems no real
users exists who run more or less fresh kernel on it. The commit
05f4434bc1 ("ASoC: Intel: remove mfld_machine") also in align
with this theory.
Due to above and to reduce a burden of supporting outdated drivers
we remove the support of outdated platforms completely.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
The unicore32 port is removed from the kernel.
There is no point to keep stale RTC driver for this architecture.
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Pull mfd updates from Lee Jones:
"New Drivers:
- Add support for IQS620A/621/622/624/625 Azoteq IQS62X Sensors
New Device Support:
- Add support for ADC, IRQ, Regulator, RTC and WDT to Ricoh RN5T618 PMIC
- Add support for Comet Lake to Intel LPSS
New Functionality:
- Add support for Charger Detection to Spreadtrum SC27xx PMICs
- Add support for Interrupt Polarity to Dialog Semi DA9062/61 PMIC
- Add ACPI enumeration support to Diolan DLN2 USB Adaptor
Fix-ups:
- Device Tree; iqs62x, rn5t618, cros_ec_dev, stm32-lptimer, rohm,bd71837, rohm,bd71847
- I2C registration; rn5t618
- Kconfig; MFD_CPCAP, AB8500_CORE, MFD_WM8994, MFD_WM97xx, MFD_STPMIC1
- Use flexible-array members; omap-usb-tll, qcom-pm8xxx
- Remove unnecessary casts; omap-usb-host, omap-usb-tll
- Power (suspend/resume/poweroff) enhancements; rk808
- Improve error/sanity checking; dln2
- Use snprintf(); aat2870-core
Bug Fixes:
- Fix PCI IDs in intel-lpss-pci"
* tag 'mfd-next-5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd: (33 commits)
mfd: intel-lpss: Fix Intel Elkhart Lake LPSS I2C input clock
mfd: aat2870: Use scnprintf() for avoiding potential buffer overflow
mfd: dln2: Allow to be enumerated via ACPI
mfd: da9062: Add support for interrupt polarity defined in device tree
dt-bindings: bd718x7: Yamlify and add BD71850
mfd: dln2: Fix sanity checking for endpoints
mfd: intel-lpss: Add Intel Comet Lake PCH-V PCI IDs
mfd: sc27xx: Add USB charger type detection support
dt-bindings: mfd: Document STM32 low power timer bindings
mfd: rk808: Convert RK805 to shutdown/suspend hooks
mfd: rk808: Reduce shutdown duplication
mfd: rk808: Stop using syscore ops
mfd: rk808: Ensure suspend/resume hooks always work
mfd: rk808: Always use poweroff when requested
mfd: omap: Remove useless cast for driver.name
mfd: Kconfig: Fix some misspelling of the word functionality
mfd: pm8xxx: Replace zero-length array with flexible-array member
mfd: omap-usb-tll: Replace zero-length array with flexible-array member
mfd: cpcap: Fix compile if MFD_CORE is not selected
mfd: cros_ec: Check DT node for usbpd-notify add
...
Pull RTC updates from Alexandre Belloni:
"More cleanup this cycle, with the final goal of removing the
rtc_time_to_tm and rtc_tm_to_time wrappers. All the drivers that have
been modified for this now are ready for the end of times (whether it
happens in 2033, 2038, 2106, 2127 or even 4052). There is also a
single new driver and the usual fixes and features.
Summary:
Subsystem:
- The rtc_time_to_tm and rtc_tm_to_time wrappers have finally been
removed and only the 64bit version remain.
- hctosys now works with drivers compiled as modules
New driver:
- MediaTek MT2712 SoC based RTC
Drivers:
- set range for 88pm860x, au1xxx, cpcap, da9052, davinci, ds1305,
ds1374, mcp5121, pl030, pl031, pm8xxx, puv3, sa1100, sirfsoc,
starfire, sun6i
- ds1307: DS1388 oscillator failure detection and watchdog support
- jz4740: JZ4760 support
- pcf85063: clock out pin support
- sun6i: external 32k oscillator is now optional, the range is now
handled by the core, providing a solution for 2034"
* tag 'rtc-5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (87 commits)
rtc: ds1307: check for failed memory allocation on wdt
rtc: class: remove redundant assignment to variable err
rtc: remove rtc_time_to_tm and rtc_tm_to_time
rtc: sun6i: let the core handle rtc range
rtc: sun6i: switch to rtc_time64_to_tm/rtc_tm_to_time64
rtc: ds1307: add support for watchdog timer on ds1388
rtc: da9052: switch to rtc_time64_to_tm/rtc_tm_to_time64
rtc: da9052: set range
rtc: da9052: convert to devm_rtc_allocate_device
rtc: imx-sc: Align imx sc msg structs to 4
rtc: fsl-ftm-alarm: report alarm to core
rtc: pcf85063: Add pcf85063 clkout control to common clock framework
rtc: make definitions in include/uapi/linux/rtc.h actually useful for user space
rtc: class: avoid unnecessary lookup in hctosys
dt-bindings: rtc: Convert and update jz4740-rtc doc to YAML
rtc: jz4740: Rename vendor-specific DT properties
rtc: jz4740: Add support for JZ4760 SoC
rtc: class: support hctosys from modular RTC drivers
rtc: pm8xxx: clear alarm register when alarm is not enabled
rtc: omap: drop unused dt-bindings header
...
Add an RTC driver for the RTC device on Ricoh MFD RC5T619,
which is implemented as a variant of RN5T618.
rtc-range output:
Testing 2000-02-28 23:59:59.
OK
Testing 2038-01-19 03:14:07.
OK
Testing 2069-12-31 23:59:59.
OK
Testing 2099-12-31 23:59:59.
KO RTC_RD_TIME returned 22 (line 138)
Testing 2100-02-28 23:59:59.
KO RTC_SET_TIME returned 34 (line 122)
Testing 2106-02-07 06:28:15.
KO RTC_SET_TIME returned 34 (line 122)
Testing 2262-04-11 23:47:16.
KO RTC_SET_TIME returned 34 (line 122)
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Due to distribution constraints it may not be possible to statically
compile the required RTC driver into the kernel.
Expand RTC_HCTOSYS support to cover all RTC devices (statically compiled
or not) by checking at the end of RTC device registration whether the
time should be synced.
Signed-off-by: Steve Muckle <smuckle@google.com>
Link: https://lore.kernel.org/r/20191106194625.116692-1-smuckle@google.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Drop the separate driver that registers the EFI rtc on all EFI
systems that have runtime services available, and instead, move
the registration into the core EFI code, and make it conditional
on whether the actual time related services are available.
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
The Amlogic Meson GX SoCs uses a special register to store the
time in seconds to wakeup after a system suspend.
In order to be able to reuse the RTC wakealarm feature, this
driver implements a fake RTC device which uses the system time
to deduce a suspend delay.
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
[khilman: rebase to v5.3-rc, rework and modernization]
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Link: https://lore.kernel.org/r/20190812232850.8016-3-khilman@kernel.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Support RTC block in ROHM bd70528 power management IC. Support
getting and setting the time and date as well as arming an alarm
which can also be used to wake the PMIC from standby state.
HW supports wake interrupt only for the next 24 hours (sec, minute
and hour information only) so we limit also the alarm interrupt to
this 24 hours for the sake of consistency.
Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Read and writes the time to the non-battery backed RTC in the ASPEED BMC
system on chip families.
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
