The WENR feature (set a magic value to enable RTC registers read-write)
first appeared on the JZ4760; the JZ4780 came much later.

Since it would be dangerous to specify a newer SoC's compatible string as
the fallback of an older SoC's compatible string, we add support for the
"ingenic,jz4760-rtc" compatible string in the driver.

This will permit to support the JZ4770 by having:
compatible = "ingenic,jz4770-rtc", "ingenic,jz4760-rtc";

Instead of doing:
compatible = "ingenic,jz4770-rtc", "ingenic,jz4780-rtc";
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20200311182318.22154-1-paul@crapouillou.netSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

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.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Clear alarm register when alarm is not enabled otherwise the consumer
may still start alarm timer if it find the alarm register is not zero.
Signed-off-by: hankecai <hankecai@vivo.com>
Link: https://lore.kernel.org/r/APoAZgAaCEiRpKG6PlzreaqE.1.1584791417367.Hmail.hankecai@vivo.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

The definitons in the dt-binding's gpio header only contains some
constants to be used in device trees. It is not relevant for rtc-omap
(as the gpio API hides the details) and in fact unused so it can just be
dropped.
Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Link: https://lore.kernel.org/r/20200321203737.29850-1-uwe@kleine-koenig.orgSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Since the commit 7723f4c5 ("driver core: platform: Add an error message
to platform_get_irq*()") platform_get_irq() started issuing an error message.
Thus, there is no need to have the same in the driver.
Signed-off-by: Keyur Patel <iamkeyur96@gmail.com>
Link: https://lore.kernel.org/r/20200321180838.12729-1-iamkeyur96@gmail.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

I have hit the following build error:
armv7a-hardfloat-linux-gnueabi-ld: drivers/rtc/rtc-max8907.o: in function `max8907_rtc_probe':
rtc-max8907.c:(.text+0x400): undefined reference to `regmap_irq_get_virq'

max8907 should select REGMAP_IRQ

Fixes: 94c01ab6 ("rtc: add MAX8907 RTC driver")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Link: https://lore.kernel.org/r/1584545209-20433-1-git-send-email-clabbe@baylibre.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

This patch enables ACPI support in Rtc Flex timer driver.
Signed-off-by: Peng Ma <peng.ma@nxp.com>
Link: https://lore.kernel.org/r/20200318025354.6447-1-peng.ma@nxp.com
Link: https://lore.kernel.org/r/20200323072956.38263-1-peng.ma@nxp.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Use devm_add_action_or_reset() for calls to clk_disable_unprepare(),
which can simplify the error handling, and .remove callback can be dropped.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Link: https://lore.kernel.org/r/1584349785-27042-1-git-send-email-Anson.Huang@nxp.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

The FLAG register is at a different location to the other supported RTCs
so this requires an extra case in the existing switch statement.
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Link: https://lore.kernel.org/r/20200207031812.14424-2-chris.packham@alliedtelesis.co.nzSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Fix this build error when PM_SLEEP is not selected:

drivers/rtc/rtc-mt2712.c:412:10: error: ‘mt2712_pm_ops’ undeclared here (not in a function); did you mean ‘mt2712_rtc_ops’?
  412 |   .pm = &mt2712_pm_ops,
      |          ^~~~~~~~~~~~~

Link: https://lore.kernel.org/r/20200317143421.9551-1-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

There is no users of the rtc platform data left, remove its support.

Link: https://lore.kernel.org/r/20200316102537.180398-1-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Call the 64bit versions of rtc_tm time conversion.

Link: https://lore.kernel.org/r/20200311223956.51352-6-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

The RTC core always passes a valid alarm time there is no need to modify
it.

Link: https://lore.kernel.org/r/20200311223956.51352-5-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

The 88pm860x RTC is a 32bit read only seconds counter with a 32bit offset.

Link: https://lore.kernel.org/r/20200311223956.51352-4-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

pdata->sync is not defined by any platform, stop calling it.

Link: https://lore.kernel.org/r/20200311223956.51352-3-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

It doesn't make sense to set the RTC to a default value at probe time. Let
the core handle invalid date and time.

Link: https://lore.kernel.org/r/20200311223956.51352-2-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

The RTC IRQ is requested before the struct rtc_device is allocated,
this may lead to a NULL pointer dereference in the IRQ handler.

To fix this issue, allocating the rtc_device struct before requesting
the RTC IRQ using devm_rtc_allocate_device, and use rtc_register_device
to register the RTC device.

Also remove the unnecessary error message as the core already prints the
info.

Link: https://lore.kernel.org/r/20200311223956.51352-1-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Use devm_add_action_or_reset() for calls to clk_disable_unprepare(),
which can simplify the error handling.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Link: https://lore.kernel.org/r/1584109849-21402-1-git-send-email-Anson.Huang@nxp.com
Link: https://lore.kernel.org/r/1584233264-26025-1-git-send-email-Anson.Huang@nxp.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

This patch add MT2712 RTC related files to MAINTAINERS file.
Signed-off-by: Ran Bi <ran.bi@mediatek.com>
Link: https://lore.kernel.org/r/20200226051303.22560-5-ran.bi@mediatek.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

This add support for the MediaTek MT2712 RTC. It was SoC based RTC, but
had different architecture compared with MT7622 RTC.
Signed-off-by: Ran Bi <ran.bi@mediatek.com>
Link: https://lore.kernel.org/r/20200226051303.22560-3-ran.bi@mediatek.com
Link: https://lore.kernel.org/r/20200316104701.209293-2-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Document the binding for MT2712 RTC implemented by rtc-mt2712.
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Ran Bi <ran.bi@mediatek.com>
Link: https://lore.kernel.org/r/20200226051303.22560-2-ran.bi@mediatek.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

With the IOC3 MFD driver it's no longer necessary to special case SGI-IP27.
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Link: https://lore.kernel.org/r/20200309123514.15543-1-tsbogend@alpha.franken.deSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Some boards, like OrangePi PC2 (H5), OrangePi Plus 2E (H3) and Tanix TX6
(H6) don't have external 32kHz oscillator. Till H6, it didn't really
matter if external oscillator was enabled because HW detected error and
fall back to internal one. H6 has same functionality but it's the first
SoC which have "auto switch bypass" bit documented and always enabled in
driver. This prevents RTC to work correctly if external crystal is not
present on board. There are other side effects - all peripherals which
depends on this clock also don't work (HDMI CEC for example).

Make clocks property optional. If it is present, select external
oscillator. If not, stay on internal.
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Acked-by: Maxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/r/20200308135849.106333-2-jernej.skrabec@siol.netSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Call the 64bit versions of rtc_tm time conversion.

Link: https://lore.kernel.org/r/20200306010240.40056-2-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

This RTC is a 32bit seconds counter.

Link: https://lore.kernel.org/r/20200306010240.40056-1-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Call the 64bit versions of rtc_tm time conversion.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20200306010101.39517-1-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Call the 64bit versions of rtc_tm time conversion to allow extending
support after 2106 and properly supporting the STv2 range.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20200306005809.38530-3-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

The PL031 and ST v1 RTC are 32bit seconds counters. STv2 is a BCD RTC
apparently going from 0000 to 9999, hopefully handling the leap days
properly until then.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20200306005809.38530-2-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

The core will never pass an invalid alarm to .set_alarm, it is not
necessary to check for its validity.
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20200306005809.38530-1-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Allow building building the driver with COMPILE_TEST.

Link: https://lore.kernel.org/r/20200306131629.18837-1-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Call the 64bit versions of rtc_tm time conversion.

Link: https://lore.kernel.org/r/20200306074404.58909-4-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

The datasheet states that 4052 is the maximum value for year. However, the
mpc5121 read_time and set_time function abuse the target time register
instead of using the broken down time so it is limited to 2106.

Link: https://lore.kernel.org/r/20200306074404.58909-3-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

This simplifies the path for the rtc_ops selection.

Link: https://lore.kernel.org/r/20200306074404.58909-2-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Use devm managed function to simplify probe and remove.

Link: https://lore.kernel.org/r/20200306074404.58909-1-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

rtc_time64_to_tm never generates an invalid rtc_tm, stop validating it.

Link: https://lore.kernel.org/r/20200306073758.58050-4-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Call the 64bit versions of rtc_tm time conversion.

Link: https://lore.kernel.org/r/20200306073758.58050-3-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

The pm8xxx are 32bit seconds counter.

Link: https://lore.kernel.org/r/20200306073758.58050-2-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

This allows further improvement of the driver. Also remove the unnecessary
error string as the core will already display error messages.

Link: https://lore.kernel.org/r/20200306073758.58050-1-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Call the 64bit version of rtc_tm to time conversion.

Link: https://lore.kernel.org/r/20200306073459.57197-2-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

The ds1305 is a BCD rtc valid from 2000 to 2099.

Link: https://lore.kernel.org/r/20200306073459.57197-1-alexandre.belloni@bootlin.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>