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* Merge tag 'rtc-6.6' of ↵Linus Torvalds2023-09-0750-548/+1219
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux Pull RTC updates from Alexandre Belloni: "Subsystem: - Add a way for drivers to tell the core the supported alarm range is smaller than the date range. This is not used yet but will be useful for the alarmtimers in the next release. - fix Wvoid-pointer-to-enum-cast warnings - remove redundant of_match_ptr() - stop warning for invalid alarms when the alarm is disabled Drivers: - isl12022: allow setting the trip level for battery level detection - pcf2127: add support for PCF2131 and multiple timestamps - stm32: time precision improvement, many fixes - twl: NVRAM support" * tag 'rtc-6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (73 commits) dt-bindings: rtc: ds3231: Remove text binding rtc: wm8350: remove unnecessary messages rtc: twl: remove unnecessary messages rtc: sun6i: remove unnecessary message rtc: stop warning for invalid alarms when the alarm is disabled rtc: twl: add NVRAM support rtc: pcf85363: Allow to wake up system without IRQ rtc: m48t86: add DT support for m48t86 dt-bindings: rtc: Add ST M48T86 rtc: pcf2127: remove useless check rtc: rzn1: Report maximum alarm limit to rtc core rtc: ds1305: Report maximum alarm limit to rtc core rtc: tps6586x: Report maximum alarm limit to rtc core rtc: cmos: Report supported alarm limit to rtc infrastructure rtc: cros-ec: Detect and report supported alarm window size rtc: Add support for limited alarm timer offsets rtc: isl1208: Fix incorrect logic in isl1208_set_xtoscb() MAINTAINERS: remove obsolete pattern in RTC SUBSYSTEM section rtc: tps65910: Remove redundant dev_warn() and do not check for 0 return after calling platform_get_irq() rtc: omap: Do not check for 0 return after calling platform_get_irq() ...
| * rtc: wm8350: remove unnecessary messagesAlexandre Belloni2023-09-061-7/+2
| | | | | | | | | | | | | | | | | | The RTC core already prints a message when the RTC is registered and when registering fails, it is not necessary to have more in the driver. Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com> Link: https://lore.kernel.org/r/20230827221643.544259-3-alexandre.belloni@bootlin.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: twl: remove unnecessary messagesAlexandre Belloni2023-09-061-5/+1
| | | | | | | | | | | | | | | | The RTC core already prints a message when the RTC is registered and when registering fails, it is not necessary to have more in the driver. Link: https://lore.kernel.org/r/20230827221643.544259-2-alexandre.belloni@bootlin.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: sun6i: remove unnecessary messageAlexandre Belloni2023-09-061-2/+0
| | | | | | | | | | | | | | | | | | The core already print a message once the rtc is successfully registered, it is not necessary to print an other one. Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com> Link: https://lore.kernel.org/r/20230827221643.544259-1-alexandre.belloni@bootlin.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: stop warning for invalid alarms when the alarm is disabledAlexandre Belloni2023-09-061-1/+1
| | | | | | | | | | | | | | | | | | | | | | When the alarm is not enabled, it may never have been set and so we can't expect it to be valid. This will prevent the apparition of boot messages like this one: rtc rtc0: invalid alarm value: 2023-7-8 45:85:85 Link: https://lore.kernel.org/r/20230827221532.543353-1-alexandre.belloni@bootlin.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: twl: add NVRAM supportLadislav Michl2023-08-281-0/+37
| | | | | | | | | | | | | | | | | | Export SRAM using nvmem. Signed-off-by: Ladislav Michl <ladis@linux-mips.org> Reviewed-by: Tony Lindgren <tony@atomide.com> Link: https://lore.kernel.org/r/ZDf7qZTiml0ijD2g@lenoch Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: pcf85363: Allow to wake up system without IRQMike Looijmans2023-08-281-9/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | When wakeup-source is set in the devicetree, set up the device for using the output as interrupt instead of clock. This is similar to how other RTC devices handle this. This allows the clock chip to turn on the board when wired to do so in hardware. Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl> Link: https://lore.kernel.org/r/20230821072013.7072-1-mike.looijmans@topic.nl Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: m48t86: add DT support for m48t86Nikita Shubin2023-08-281-0/+8
| | | | | | | | | | | | | | | | | | | | | | Add OF ID match table. Acked-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/lkml/20230601054549.10843-12-nikita.shubin@maquefel.me/ Signed-off-by: Nikita Shubin <nikita.shubin@maquefel.me> Link: https://lore.kernel.org/r/20230823-m48t86_device_tree-v2-2-21ff275f949d@maquefel.me Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: pcf2127: remove useless checkAlexandre Belloni2023-08-271-9/+0
| | | | | | | | | | | | | | | | This check is only useful when introducing support for a new RTC in the driver. Cut down the number of strings in th driver. Link: https://lore.kernel.org/r/20230827214649.537095-1-alexandre.belloni@bootlin.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: rzn1: Report maximum alarm limit to rtc coreGuenter Roeck2023-08-271-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | RZN1 only supports alarms up to one week in the future. Report the limit to the RTC core and use the reported limit to validate the requested alarm time when setting it. Cc: Brian Norris <briannorris@chromium.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/r/20230817225537.4053865-8-linux@roeck-us.net Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: ds1305: Report maximum alarm limit to rtc coreGuenter Roeck2023-08-271-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | DS1305 only supports alarms up to 24 hours in the future. Report the limit to the RTC core, and use the reported limit to validate the requested alarm time when setting it. If the alarm is too large when trying to set an alarm, return -ERANGE instead of -EDOM to align with error codes returned by other rtc drivers. Cc: Brian Norris <briannorris@chromium.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20230817225537.4053865-7-linux@roeck-us.net Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: tps6586x: Report maximum alarm limit to rtc coreGuenter Roeck2023-08-271-0/+1
| | | | | | | | | | | | | | | | | | | | tps6586x only supports alarms up to 16,383 seconds in the future. Report the limit to the RTC core. Cc: Brian Norris <briannorris@chromium.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20230817225537.4053865-6-linux@roeck-us.net Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: cmos: Report supported alarm limit to rtc infrastructureGuenter Roeck2023-08-271-0/+11
| | | | | | | | | | | | | | | | | | | | The alarm window supported by the cmos RTC depends on the chip and its configuration. Report the limit to the RTC core. Cc: Brian Norris <briannorris@chromium.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20230817225537.4053865-5-linux@roeck-us.net Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: cros-ec: Detect and report supported alarm window sizeGuenter Roeck2023-08-271-15/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The RTC on some older Chromebooks can only handle alarms less than 24 hours in the future. The only way to find out is to try to set an alarm further in the future. If that fails, assume that the RTC connected to the EC can only handle less than 24 hours of alarm window, and report that value to the RTC core. After that change, it is no longer necessary to limit the alarm time when setting it. Report any excessive alarms to the caller instead. Cc: Brian Norris <briannorris@chromium.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20230817225537.4053865-4-linux@roeck-us.net Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: isl1208: Fix incorrect logic in isl1208_set_xtoscb()Biju Das2023-08-271-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The XTOSCB bit is not bit 0, but xtosb_val is either 0 or 1. If it is 1, test will never succeed. Fix this issue by using double negation. While at it, remove unnecessary blank line from probe(). Reported-by: Pavel Machek <pavel@denx.de> Closes: https://lore.kernel.org/all/ZN4BgzG2xmzOzdFZ@duo.ucw.cz/ Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> Reviewed-by: Pavel Machek <pavel@denx.de> Link: https://lore.kernel.org/r/20230817161038.407960-1-biju.das.jz@bp.renesas.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: tps65910: Remove redundant dev_warn() and do not check for 0 return ↵Ruan Jinjie2023-08-171-5/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | after calling platform_get_irq() It is not possible for platform_get_irq() to return 0. Use the return value from platform_get_irq(). And there is no need to call the dev_warn() function directly to print a custom message when handling an error from platform_get_irq() function as it is going to display an appropriate error message in case of a failure. Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com> Link: https://lore.kernel.org/r/20230803080713.4061782-3-ruanjinjie@huawei.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: omap: Do not check for 0 return after calling platform_get_irq()Ruan Jinjie2023-08-171-4/+4
| | | | | | | | | | | | | | | | | | It is not possible for platform_get_irq() to return 0. Use the return value from platform_get_irq(). Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com> Link: https://lore.kernel.org/r/20230803080713.4061782-2-ruanjinjie@huawei.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: da9063: Mark the alarm IRQ as a wake IRQSamuel Holland2023-08-171-0/+7
| | | | | | | | | | | | | | | | | | | | | | This keeps the IRQ enabled during system suspend, if the RTC's wakeup source is enabled. Since the IRQ is not required to wake from shutdown, continue to add the wakeup source even if registering the wakeirq fails. See commit 029d3a6f2f3c ("rtc: da9063: add as wakeup source"). Signed-off-by: Samuel Holland <samuel.holland@sifive.com> Link: https://lore.kernel.org/r/20230717190937.1301509-1-samuel.holland@sifive.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: pcf2127: remove unused function argumentHugo Villeneuve2023-08-171-6/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | Fixes the following W=1 kernel build warning(s): drivers/rtc/rtc-pcf2127.c: In function ‘pcf2127_probe’: drivers/rtc/rtc-pcf2127.c:635:32: warning: unused parameter ‘name’ [-Wunused-parameter] 635 | int alarm_irq, const char *name, bool is_pcf2127) | ~~~~~~~~~~~~^~~~ Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com> Link: https://lore.kernel.org/r/20230801190432.3340545-1-hugo@hugovil.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: pcf2127: add error checking when disabling POR0Hugo Villeneuve2023-08-171-1/+3
| | | | | | | | | | | | | | | | | | | | | | If PCF2127 device is absent from the I2C bus, or if there is a communication problem, disabling POR0 may fail silently and we still continue with probing the device. In that case, abort probe operation. Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com> Link: https://lore.kernel.org/r/20230728171211.3016019-1-hugo@hugovil.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: pcf2127: fix error code in pcf2127_enable_ts()Dan Carpenter2023-08-171-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | This error path accidentally returns success. Return -EINVAL instead. Fixes: 420cc9e850db ("rtc: pcf2127: add support for multiple TS functions") Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> Reviewed-by: Bruno Thomsen <bruno.thomsen@gmail.com> Reviewed-by: Hugo Villeneuve <hugo@hugovil.com> Reviewed-by: Hugo Villeneuve <hvilleneuve@dimonoff.com> Link: https://lore.kernel.org/r/55b9c84b-9d21-444f-b91a-cf9316b65833@moroto.mountain Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: ds2404: Convert to GPIO descriptorsLinus Walleij2023-08-171-100/+69
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This converts the DS2404 to use GPIO descriptors instead of hard-coded global GPIO numbers. The platform data can be deleted because there are no in-tree users and it only contained GPIO numbers which are now passed using descriptor tables (or device tree or ACPI). The driver was rewritten to use a state container for the device driver state (struct ds2404 *chip) and pass that around instead of using a global singleton storage for the GPIO handles. When declaring GPIO descriptor tables or other hardware descriptions for the RTC driver, implementers should take care to flag the RESET line as active low, such as by using the GPIOD_ACTIVE_LOW flag in the descriptor table. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20230807-descriptors-rtc-v1-1-ce0f9187576e@linaro.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: stm32: Use NOIRQ_SYSTEM_SLEEP_PM_OPS()Nathan Chancellor2023-08-171-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | After the switch to SET_NOIRQ_SYSTEM_SLEEP_PM_OPS() and a subsequent fix, stm32_rtc_{suspend,resume}() are unused when CONFIG_PM_SLEEP is not set because SET_NOIRQ_SYSTEM_SLEEP_PM_OPS() is a no-op in that configuration: drivers/rtc/rtc-stm32.c:904:12: error: 'stm32_rtc_resume' defined but not used [-Werror=unused-function] 904 | static int stm32_rtc_resume(struct device *dev) | ^~~~~~~~~~~~~~~~ drivers/rtc/rtc-stm32.c:894:12: error: 'stm32_rtc_suspend' defined but not used [-Werror=unused-function] 894 | static int stm32_rtc_suspend(struct device *dev) | ^~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors The non-"SET_" version of this macro, NOIRQ_SYSTEM_SLEEP_PM_OPS(), is designed to handle this situation by only assigning the callbacks when CONFIG_PM_SLEEP is set while allowing the functions to appear used to the compiler. Switch to that macro to resolve the warnings. There is no functional change with this, as SET_NOIRQ_SYSTEM_SLEEP_PM_OPS() is defined using NOIRQ_SYSTEM_SLEEP_PM_OPS() when CONFIG_PM_SLEEP is set. Signed-off-by: Nathan Chancellor <nathan@kernel.org> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/20230815-rtc-stm32-unused-pm-funcs-v1-1-82eb8e02d903@kernel.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: rs5c372: fix Wvoid-pointer-to-enum-cast warningKrzysztof Kozlowski2023-08-161-2/+1
| | | | | | | | | | | | | | | | | | | | | | 'type' is an enum, thus cast of pointer on 64-bit compile test with W=1 causes: rtc-rs5c372.c:829:19: error: cast to smaller integer type 'enum rtc_type' from 'const void *' [-Werror,-Wvoid-pointer-to-enum-cast] Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20230810103902.151145-4-krzysztof.kozlowski@linaro.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: jz4740: fix Wvoid-pointer-to-enum-cast warningKrzysztof Kozlowski2023-08-161-1/+1
| | | | | | | | | | | | | | | | | | | | | | 'type' is an enum, thus cast of pointer on 64-bit compile test with W=1 causes: rtc-jz4740.c:352:14: error: cast to smaller integer type 'enum jz4740_rtc_type' from 'const void *' [-Werror,-Wvoid-pointer-to-enum-cast] Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20230810103902.151145-3-krzysztof.kozlowski@linaro.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: rv8803: fix Wvoid-pointer-to-enum-cast warningKrzysztof Kozlowski2023-08-161-2/+1
| | | | | | | | | | | | | | | | | | | | | | 'type' is an enum, thus cast of pointer on 64-bit compile test with W=1 causes: rtc-rv8803.c:648:18: error: cast to smaller integer type 'enum rv8803_type' from 'const void *' [-Werror,-Wvoid-pointer-to-enum-cast] Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20230810103902.151145-2-krzysztof.kozlowski@linaro.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: ds1307: fix Wvoid-pointer-to-enum-cast warningKrzysztof Kozlowski2023-08-161-1/+1
| | | | | | | | | | | | | | | | | | | | | | 'type' is an enum, thus cast of pointer on 64-bit compile test with W=1 causes: rtc-ds1307.c:1747:18: error: cast to smaller integer type 'enum ds_type' from 'const void *' [-Werror,-Wvoid-pointer-to-enum-cast] Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20230810103902.151145-1-krzysztof.kozlowski@linaro.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: isl12022: implement support for the #clock-cells DT propertyRasmus Villemoes2023-08-161-0/+44
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If device tree implies that the chip's IRQ/F_OUT pin is used as a clock, expose that in the driver. For now, pretend it is a fixed-rate (32kHz) clock; if other use cases appear the driver can be updated to provide its own clk_ops etc. When the clock output is not used on a given board, one can prolong the battery life by ensuring that the FOx bits are 0. For the hardware I'm currently working on, the RTC draws 1.2uA with the FOx bits at their default 0001 value, dropping to 0.88uA when those bits are cleared. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Link: https://lore.kernel.org/r/20230615105826.411953-9-linux@rasmusvillemoes.dk Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: isl12022: trigger battery level detection during probeRasmus Villemoes2023-08-161-0/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Since the meaning of the SR_LBAT85 and SR_LBAT75 bits are different in battery backup mode, they may very well be set after power on, and stay set for up to a minute (i.e. until the battery detection in VDD mode happens when the seconds counter hits 59). This would mean that userspace doing a ioctl(RTC_VL_READ) early on could get a false positive. The battery level detection can also be triggered by explicitly writing a 1 to the TSE bit in the BETA register. Do that once during boot. Empirically, this does not immediately update the bits in the status register (i.e., an immediate read of SR after this write can still show stale values), but the update is done after a few milliseconds, so certainly before the RTC device gets registered and userspace has a chance of doing the ioctl() on this device. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Link: https://lore.kernel.org/r/20230615105826.411953-7-linux@rasmusvillemoes.dk Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: isl12022: implement RTC_VL_READ ioctlRasmus Villemoes2023-08-161-0/+27
| | | | | | | | | | | | | | | | | | | | Hook up support for reading the values of the SR_LBAT85 and SR_LBAT75 bits. Translate the former to "battery low", and the latter to "battery empty or not-present". Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Link: https://lore.kernel.org/r/20230615105826.411953-6-linux@rasmusvillemoes.dk Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: isl12022: add support for trip level DT bindingRasmus Villemoes2023-08-161-0/+39
| | | | | | | | | | | | | | | | | | | | Implement support for using the values given in the isil,battery-trip-levels-microvolt property to set appropriate values in the VB85TP/VB75TP bits in the PWR_VBAT register. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Link: https://lore.kernel.org/r/20230615105826.411953-5-linux@rasmusvillemoes.dk Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: isl12022: remove wrong warning for low battery levelRasmus Villemoes2023-08-161-6/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There are multiple problems with this warning. First of all, it triggers way too often, in fact nearly on every boot, because the SR_LBAT85/SR_LBAT75 bits have another meaning when in battery backup mode. Quoting from the data sheet: LOW BATTERY INDICATOR 85% BIT (LBAT85) In Normal Mode (VDD), this bit indicates when the battery level has dropped below the pre-selected trip levels. [...] The LBAT85 detection happens automatically once every minute when seconds register reaches 59. In Battery Mode (VBAT), this bit indicates the device has entered into battery mode by polling once every 10 minutes. The LBAT85 detection happens automatically once when the minute register reaches x9h or x0h minutes. Similar wording applies to the LBAT75 bit. This means that if the device is powered off for more than 10 minutes, the LBAT85 bit is guaranteed to be set. Upon power-on, unless we're close enough to the end of a minute and/or the boot is slow enough that the second register passes 59, the LBAT85 bit is still set when the kernel (or early userspace) reads the RTC to set the system's wallclock time. Another minor problem is with the bit logic. If the 75% level is reached, logically we're also below 85%, so both bits would most likely be set. So even if the battery is below 75%, the warning would still say "voltage dropped below 85%". A third problem is that the driver and current DT binding offer no way to indicate the nominal battery level and/or settings of the Battery Level Monitor Trip Bits. Since the default value of the VB85TP[2:0] and VB75TP[2:0] bits are 000, this means the actual setting of the LBAT85/LBAT75 bits in VDD mode doesn't happen until the battery is below 2.125V/1.875V, which for a standard 3V battery is way too late. A fourth problem is emitting this warning from ->read_time: util-linux' hwclock will, in the absence of support for getting an interrupt when the seconds counter is updated, issue ioctl(RTC_RD_TIME) in a busy-loop until it sees a change in the seconds field. In that case, if the battery low bits are set (either genuinely, more than a minute after boot, due to the battery actually being low, or as above, bogusly shortly after boot), the kernel log is swamped with hundreds of identical warnings. Subsequent patches will add such bindings and driver support, and also proper support for RTC_VL_READ. For now, remove the broken warning. Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Link: https://lore.kernel.org/r/20230615105826.411953-2-linux@rasmusvillemoes.dk Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: remove redundant of_match_ptr()Zhu Wang2023-08-105-7/+5
| | | | | | | | | | | | | | | | | | | | Signed-off-by: Zhu Wang <wangzhu9@huawei.com> Link: https://lore.kernel.org/r/20230808115213.154377-2-wangzhu9@huawei.com Link: https://lore.kernel.org/r/20230808115213.154377-3-wangzhu9@huawei.com Link: https://lore.kernel.org/r/20230808115213.154377-4-wangzhu9@huawei.com Link: https://lore.kernel.org/r/20230808115213.154377-5-wangzhu9@huawei.com Link: https://lore.kernel.org/r/20230808115213.154377-6-wangzhu9@huawei.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: sunplus: Clean up redundant dev_err_probe()Chen Jiahao2023-08-101-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Referring to platform_get_irq()'s definition, the return value has already been checked if ret < 0, and printed via dev_err_probe(). Calling dev_err_probe() one more time outside platform_get_irq() is obviously redundant. Removing dev_err_probe() outside platform_get_irq() to clean up above problem. Signed-off-by: Chen Jiahao <chenjiahao16@huawei.com> Link: https://lore.kernel.org/r/20230802093650.976352-1-chenjiahao16@huawei.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: stm32: remove incorrect #ifdef checkArnd Bergmann2023-08-101-2/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | After a previous commit changed the driver over to SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(), the suspend/resume functions must no longer be hidden behind an #ifdef: In file included from include/linux/clk.h:13, from drivers/rtc/rtc-stm32.c:8: drivers/rtc/rtc-stm32.c:927:39: error: 'stm32_rtc_suspend' undeclared here (not in a function); did you mean 'stm32_rtc_probe'? 927 | SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(stm32_rtc_suspend, stm32_rtc_resume) | ^~~~~~~~~~~~~~~~~ include/linux/kernel.h:58:44: note: in definition of macro 'PTR_IF' 58 | #define PTR_IF(cond, ptr) ((cond) ? (ptr) : NULL) | ^~~ include/linux/pm.h:329:26: note: in expansion of macro 'pm_sleep_ptr' 329 | .suspend_noirq = pm_sleep_ptr(suspend_fn), \ | ^~~~~~~~~~~~ Fixes: fb9a7e5360dc8 ("rtc: stm32: change PM callbacks to "_noirq()"") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Valentin Caron <valentin.caron@foss.st.com> Link: https://lore.kernel.org/r/20230801105932.3738430-1-arnd@kernel.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: isl12026: Drop "_new" from probe callback nameUwe Kleine-König2023-07-271-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The driver was introduced when .probe_new was the right probe callback to use for i2c drivers. Today .probe is the right one (again) and the driver was already switched in commit 31b0cecb4042 ("rtc: Switch i2c drivers back to use .probe()") but the name continued to include "_new" in its name. To prevent code readers wondering about what might be new here, drop that irritating part of the name. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20230725070429.383070-1-u.kleine-koenig@pengutronix.de Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: Explicitly include correct DT includesRob Herring2023-07-2730-38/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20230724205456.767430-1-robh@kernel.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: rv3028: Add support for "aux-voltage-chargeable" propertyAndrej Picej2023-07-271-19/+61
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Property "trickle-resistor-ohms" allows us to set trickle charger resistor. However there is no possibility to disable it afterwards. Add support for "aux-voltage-chargeable" property which can be used to enable/disable the trickle charger circuit explicitly. The default behavior of the code is kept as it is! Additionally, lets make sure we only update internal EEPROM in case of a change. This prevents wear due to excessive EEPROM writes on each probe. Signed-off-by: Andrej Picej <andrej.picej@norik.com> Link: https://lore.kernel.org/r/20230623081533.76334-1-andrej.picej@norik.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: bq4802: add sparc dependencyArnd Bergmann2023-07-271-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The added HAS_IOPORT dependency might not actually be necessary as Geert points out, but the driver is also only used on one architecture. Sparc is also a special case here since it converts port numbers into virtual addresses rather than having them mapped into a particular part of the __iomem address space, so the difference is actually not important here. Add a dependency on sparc, but allow compile-testing otherwise, to make this clearer without anyone having to spend much time modernizing the driver beyond that. Reported-by: Geert Uytterhoeven <geert+renesas@glider.be> Cc: David S. Miller <davem@davemloft.net> Link: https://lore.kernel.org/all/CAMuHMdWEx0F=fNei4Bz_JPkuvoaN-+zk08h0i8KnSi_VjO615g@mail.gmail.com/ Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lore.kernel.org/r/20230719192835.1025406-1-arnd@kernel.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: pcf85063: Drop enum pcf85063_type and split pcf85063_cfg[]Biju Das2023-07-271-45/+38
| | | | | | | | | | | | | | | | | | | | | | Drop enum pcf85063_type and split the array pcf85063_cfg[] as individual variables, and make lines shorter by referring to e.g. &pcf85063_cfg instead of &pcf85063_cfg[PCF85063]. Suggested-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> Link: https://lore.kernel.org/r/20230717124059.196244-3-biju.das.jz@bp.renesas.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: pcf85063: Simplify probe()Biju Das2023-07-271-18/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The pcf85063_ids[].driver_data could store a pointer to the config, like for DT-based matching, making I2C and DT-based matching more similar. After that, we can simplify the probe() by replacing of_device_get_ match_data() and i2c_match_id() by i2c_get_match_data() as we have similar I2C and DT-based matching table. Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lore.kernel.org/r/20230717124059.196244-2-biju.das.jz@bp.renesas.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: isl1208: Simplify probe()Biju Das2023-07-271-11/+3
| | | | | | | | | | | | | | | | | | | | | | Simplify the probe() by replacing of_device_get_match_data() and i2c_match_id() by i2c_get_match_data() as we have similar I2C and DT-based matching table. Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lore.kernel.org/r/20230710114747.106496-1-biju.das.jz@bp.renesas.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: stm32: fix unnecessary parenthesesValentin Caron2023-07-271-5/+4
| | | | | | | | | | | | | | | | | | | | Fix a few style issues reported by checkpatch.pl: - Unnecessary parentheses - Lines should not end with a '(' Signed-off-by: Valentin Caron <valentin.caron@foss.st.com> Link: https://lore.kernel.org/r/20230705174357.353616-8-valentin.caron@foss.st.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: stm32: fix issues of stm32_rtc_valid_alrm functionValentin Caron2023-07-271-28/+33
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | stm32_rtc_valid_alrm function has some issues : - arithmetical operations are impossible on BCD values - "cur_mon + 1" can overflow - the use case with the next month, the same day/hour/minutes went wrong To solve that, we prefer to use timestamp comparison. e.g. : On 5 Dec. 2021, the alarm limit is 5 Jan. 2022 (+31 days) On 31 Jan 2021, the alarm limit is 28 Feb. 2022 (+28 days) Signed-off-by: Valentin Caron <valentin.caron@foss.st.com> Link: https://lore.kernel.org/r/20230705174357.353616-7-valentin.caron@foss.st.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: stm32: change PM callbacks to "_noirq()"Gabriel Fernandez2023-07-271-2/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The RTC driver stops the RTCAPB clock during suspend, but the irq handler from RTC is called before starting clock. Then we are blocked while accessing RTC registers. We changes PM callbacks to '_no_irq()' to disable irq during resume callback and so irq handler will be called after the enable of RTCAPB clock. Signed-off-by: Gabriel Fernandez <gabriel.fernandez@foss.st.com> Signed-off-by: Valentin Caron <valentin.caron@foss.st.com> Link: https://lore.kernel.org/r/20230705174357.353616-6-valentin.caron@foss.st.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: stm32: don't print an error on probe deferralValentin Caron2023-07-271-8/+6
| | | | | | | | | | | | | | | | | | | | Change stm32-rtc driver to not generate an error message when device probe operation is deferred for a clock. Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com> Signed-off-by: Valentin Caron <valentin.caron@foss.st.com> Link: https://lore.kernel.org/r/20230705174357.353616-5-valentin.caron@foss.st.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: stm32: improve rtc precisionChristophe Guibout2023-07-271-4/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The rtc is used to update the stgen counter on wake up from low power modes, so it needs to be as much accurate as possible. The maximization of asynchronous divider leads to a 4ms rtc precision clock. By decreasing pred_a to 0, it will have pred_s=32767 (when need_accuracy is true), so stgen clock becomes more accurate with 30us precision. Nevertheless this will leads to an increase of power consumption. Signed-off-by: Christophe Guibout <christophe.guibout@foss.st.com> Signed-off-by: Valentin Caron <valentin.caron@foss.st.com> Link: https://lore.kernel.org/r/20230705174357.353616-4-valentin.caron@foss.st.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: stm32: don't stop time counter if not neededAntonio Borneo2023-07-271-6/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | RTC counters are stopped when INIT bit in ISR register is set and start counting from the (eventual) new value when INIT is reset. In stm32_rtc_init(), called during probe, the INIT bit is set to program the prescaler and the 24h mode. This halts the RTC counter at each probe tentative causing the RTC time to loose from 0.3s to 0.8s at each kernel boot. If the RTC is battery powered, both prescaler value and 24h mode are kept during power cycle and there is no need to program them again. Check if the desired prescaler value and the 24h mode are already programmed, then skip reprogramming them to avoid halting the time counter. Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com> Signed-off-by: Valentin Caron <valentin.caron@foss.st.com> Link: https://lore.kernel.org/r/20230705174357.353616-3-valentin.caron@foss.st.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: stm32: use the proper register sequence to read date/timeAntonio Borneo2023-07-271-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Date and time are read from two separate RTC registers. To ensure consistency between the two registers, reading the time register locks the values in the shadow date register until the date register is read. Thus, the whole date/time read requires reading the time register first, followed by reading the date register. If the reads are done in reversed order, the shadow date register will remain locked until a future read operation. The future read will read the former date value that could be already invalid. Fix the read order of date/time registers in stm32_rtc_valid_alrm() Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com> Signed-off-by: Valentin Caron <valentin.caron@foss.st.com> Link: https://lore.kernel.org/r/20230705174357.353616-2-valentin.caron@foss.st.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| * rtc: pcf2127: add UIE support for PCF2131Hugo Villeneuve2023-07-271-2/+10
| | | | | | | | | | | | | | | | | | The PCF2127/29 do NOT support alarms with a 1 second resolution, but the PCF2131 does. Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com> Link: https://lore.kernel.org/r/20230622145800.2442116-17-hugo@hugovil.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
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