linux-stable.git/drivers/rtc/Kconfig, branch v5.16.2

Merge tag 'rtc-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux

2021-11-12T19:44:31+00:00

Pull RTC updates from Alexandre Belloni:
 "This includes new ioctls to get and set parameters and in particular
  the backup switch mode that is needed for some RTCs to actually enable
  the backup voltage (and have a useful RTC).

  The same interface can also be used to get the actual features
  supported by the RTC so userspace has a better way than trying and
  failing.

  Summary:

  Subsystem:
   - Add new ioctl to get and set extra RTC parameters, this includes
     backup switch mode
   - Expose available features to userspace, in particular, when alarmas
     have a resolution of one minute instead of a second.
   - Let the core handle those alarms with a minute resolution

  New driver:
   - MSTAR MSC313 RTC

  Drivers:
   - Add SPI ID table where necessary
   - Add BSM support for rv3028, rv3032 and pcf8523
   - s3c: set RTC range
   - rx8025: set range, implement .set_offset and .read_offset"

* tag 'rtc-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (50 commits)
  rtc: rx8025: use .set_offset/.read_offset
  rtc: rx8025: use rtc_add_group
  rtc: rx8025: clear RTC_FEATURE_ALARM when alarm are not supported
  rtc: rx8025: set range
  rtc: rx8025: let the core handle the alarm resolution
  rtc: rx8025: switch to devm_rtc_allocate_device
  rtc: ab8500: let the core handle the alarm resolution
  rtc: ab-eoz9: support UIE when available
  rtc: ab-eoz9: use RTC_FEATURE_UPDATE_INTERRUPT
  rtc: rv3032: let the core handle the alarm resolution
  rtc: s35390a: let the core handle the alarm resolution
  rtc: handle alarms with a minute resolution
  rtc: pcf85063: silence cppcheck warning
  rtc: rv8803: fix writing back ctrl in flag register
  rtc: s3c: Add time range
  rtc: s3c: Extract read/write IO into separate functions
  rtc: s3c: Remove usage of devm_rtc_device_register()
  rtc: tps80031: Remove driver
  rtc: sun6i: Allow probing without an early clock provider
  rtc: pcf8523: add BSM support
  ...

rtc: tps80031: Remove driver

2021-10-23T21:52:48+00:00

Driver was upstreamed in 2013 and never got a user, remove it.

Signed-off-by: Dmitry Osipenko 
Signed-off-by: Alexandre Belloni 
Link: https://lore.kernel.org/r/20211021192258.21968-2-digetx@gmail.com

rtc: pcf8523: switch to regmap

2021-10-18T15:38:05+00:00

Use regmap to access the RTC registers, this is a huge reduction in code
lines and generated code. Values on ARMv7:

   text	   data	    bss	    dec	    hex
   5180	    132	      0	   5312	   14c0	before
   3900	    132	      0	   4032	    fc0	after

Signed-off-by: Alexandre Belloni 
Link: https://lore.kernel.org/r/20211018153651.82069-1-alexandre.belloni@bootlin.com

rtc: s3c: remove HAVE_S3C_RTC in favor of direct dependencies

2021-10-17T17:15:12+00:00

The config HAVE_S3C_RTC is not really needed since we can simply just
add the dependencies directly to RTC_DRV_S3C. Also, one less config to
keep track of!

Signed-off-by: Will McVicker 
Acked-by: Alexandre Belloni 
Link: https://lore.kernel.org/r/20211013212256.3425889-1-willmcvicker@google.com
Signed-off-by: Krzysztof Kozlowski

rtc: Add support for the MSTAR MSC313 RTC

2021-09-25T22:17:25+00:00

This adds support for the RTC block on the Mstar MSC313e SoCs and newer.

Signed-off-by: Daniel Palmer 
Co-developed-by: Romain Perier 
Signed-off-by: Romain Perier 
Reviewed-by: Nobuhiro Iwamatsu 
Signed-off-by: Alexandre Belloni 
Link: https://lore.kernel.org/r/20210823171613.18941-3-romain.perier@gmail.com

rtc: rx8010: select REGMAP_I2C

2021-09-09T08:18:40+00:00

The rtc-rx8010 uses the I2C regmap but doesn't select it in Kconfig so
depending on the configuration the build may fail. Fix it.

Signed-off-by: Yu-Tung Chang 
Signed-off-by: Alexandre Belloni 
Link: https://lore.kernel.org/r/20210830052532.40356-1-mtwget@gmail.com

rtc: move RTC_LIB_KUNIT_TEST to proper location

2021-08-10T21:22:20+00:00

Move RTC_LIB_KUNIT_TEST under RTC_LIB so it is clear in the menu this is
part of the RTC subsystem.

Signed-off-by: Alexandre Belloni 
Link: https://lore.kernel.org/r/20210810212008.631359-2-alexandre.belloni@bootlin.com

rtc: Improve performance of rtc_time64_to_tm(). Add tests.

2021-08-09T22:09:21+00:00

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 
Reported-by: kernel test robot 
Signed-off-by: Alexandre Belloni 
Link: https://lore.kernel.org/r/20210624201343.85441-1-cassio.neri@gmail.com

rtc: bd70528: Drop BD70528 support

2021-06-20T20:24:52+00:00

The only known BD70528 use-cases are such that the PMIC is controlled
from separate MCU which is not running Linux. I am not aware of
any Linux driver users. Furthermore, it seems there is no demand for
this IC. Let's ease the maintenance burden and drop the driver. We can
always add it back if there is sudden need for it.

Signed-off-by: Matti Vaittinen 
Signed-off-by: Alexandre Belloni 
Link: https://lore.kernel.org/r/20210527105819.GA3111334@localhost.localdomain

rtc: bd70528: fix BD71815 watchdog dependency

2021-05-24T22:25:30+00:00

The added Kconfig dependency is slightly incorrect, which can
lead to a link failure when the watchdog is a loadable module:

arm-linux-gnueabi-ld: drivers/rtc/rtc-bd70528.o: in function `bd70528_set_rtc_based_timers':
rtc-bd70528.c:(.text+0x6cc): undefined reference to `bd70528_wdt_set'
arm-linux-gnueabi-ld: drivers/rtc/rtc-bd70528.o: in function `bd70528_set_time':
rtc-bd70528.c:(.text+0xaa0): undefined reference to `bd70528_wdt_lock'
arm-linux-gnueabi-ld: rtc-bd70528.c:(.text+0xab8): undefined reference to `bd70528_wdt_unlock'
arm-linux-gnueabi-ld: drivers/rtc/rtc-bd70528.o: in function `bd70528_alm_enable':
rtc-bd70528.c:(.text+0xfc0): undefined reference to `bd70528_wdt_lock'
arm-linux-gnueabi-ld: rtc-bd70528.c:(.text+0x1030): undefined reference to `bd70528_wdt_unlock'

The problem is that it allows to be built-in if MFD_ROHM_BD71828
is built-in, even when the watchdog is a loadable module.

Rework this so that having the watchdog as a loadable module always
forces the rtc to be a module as well instead of built-in,
regardless of bd71828.

Fixes: c56dc069f268 ("rtc: bd70528: Support RTC on ROHM BD71815")
Signed-off-by: Arnd Bergmann 
Reviewed-by: Guenter Roeck 
Reviewed-by: Matti Vaittinen 
Acked-by: Randy Dunlap  # build-tested
Signed-off-by: Alexandre Belloni 
Link: https://lore.kernel.org/r/20210422151545.2403356-1-arnd@kernel.org