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path: root/drivers/rtc
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2025-10-05rtc: optee: fix error code in probe()Dan Carpenter1-0/+1
Return an error code if kthread_create() fails. Currently the code returns success. Fixes: 6266aea864fa ("rtc: optee: add alarm related rtc ops to optee rtc driver") Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> Link: https://lore.kernel.org/r/21f1a18008f1bbc8f70d0bd5c05b72fbf5fc9c7d.1758182509.git.dan.carpenter@linaro.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-10-01Merge branches 'ib-mfd-char-crypto-6.18', 'ib-mfd-gpio-6.18', ↵Lee Jones4-13/+308
'ib-mfd-gpio-hwmon-i2c-can-rtc-watchdog-6.18', 'ib-mfd-gpio-input-pinctrl-pwm-6.18', 'ib-mfd-input-6.18', 'ib-mfd-input-rtc-6.18' and 'ib-mfd-power-regulator-6.18' into ibs-for-mfd-merged
2025-09-16rtc: spacemit: support the SpacemiT P1 RTCAlex Elder3-0/+178
Add support for the RTC found in the SpacemiT P1 PMIC. Initially only setting and reading the time are supported. The PMIC is implemented as a multi-function device. This RTC is probed based on this driver being named in a MFD cell in the simple MFD I2C driver. Signed-off-by: Alex Elder <elder@riscstar.com> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20250825172057.163883-5-elder@riscstar.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-09-16rtc: optee: add alarm related rtc ops to optee rtc driverClément Le Goffic1-21/+413
Add read_alarm and set_alarm ops from the rtc framework. The support of an alarm is handled by a kernel thread waiting in OP-TEE for an asynchronous notification that comes in the interrupt handler of the alarm interruption on OP-TEE secure world. Once the notification arrives, the kernel thread previously suspended is rescheduled (this is handled by the OP-TEE kernel driver) and comes back with the alarm information to the kernel. A second session is therefore needed to enable/disable/cancel a waiting alarm event as the kernel thread stopped in OP-TEE takes a form of mutex on the session and so no one can use this session in parallel. Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com> Link: https://lore.kernel.org/r/20250715-upstream-optee-rtc-v1-3-e0fdf8aae545@foss.st.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-09-16rtc: optee: remove unnecessary memory operationsClément Le Goffic1-17/+12
Remove memcpy by using directly the shared memory. Remove memset be initialize variable to 0 on stack. Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com> Link: https://lore.kernel.org/r/20250715-upstream-optee-rtc-v1-2-e0fdf8aae545@foss.st.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-09-16rtc: optee: fix memory leak on driver removalClément Le Goffic1-0/+1
Fix a memory leak in case of driver removal. Free the shared memory used for arguments exchanges between kernel and OP-TEE RTC PTA. Fixes: 81c2f059ab90 ("rtc: optee: add RTC driver for OP-TEE RTC PTA") Signed-off-by: Clément Le Goffic <clement.legoffic@foss.st.com> Link: https://lore.kernel.org/r/20250715-upstream-optee-rtc-v1-1-e0fdf8aae545@foss.st.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-09-16rtc: x1205: Fix Xicor X1205 vendor prefixRob Herring (Arm)1-1/+1
The vendor for the X1205 RTC is not Xircom, but Xicor which was acquired by Intersil. Since the I2C subsystem drops the vendor prefix for driver matching, the vendor prefix hasn't mattered. Fixes: 6875404fdb44 ("rtc: x1205: Add DT probing support") Signed-off-by: Rob Herring (Arm) <robh@kernel.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20250821215703.869628-2-robh@kernel.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-09-16rtc: remove unneeded 'fast_io' parameter in regmap_configWolfram Sang1-1/+0
When using MMIO with regmap, fast_io is implied. No need to set it again. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org> Link: https://lore.kernel.org/r/20250813161517.4746-18-wsa+renesas@sang-engineering.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-09-16rtc: efi: Remove wakeup functionalityArd Biesheuvel1-74/+2
The EFI rtc driver is used by non-x86 architectures only, and exposes the get/set wakeup time functionality provided by the underlying platform. This is usually broken on most platforms, and not widely used to begin with [if at all], so let's just remove it. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Tested-by: Feng Tang <feng.tang@linux.alibaba.com> Link: https://lore.kernel.org/r/20250714060843.4029171-6-ardb+git@google.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-09-16rtc: pcf2127: clear minute/second interruptJosua Mayer1-1/+3
PCF2127 can generate interrupt every full second or minute configured from control and status register 1, bits MI (1) and SI (0). On interrupt control register 2 bit MSF (7) is set and must be cleared to continue normal operation. While the driver never enables this interrupt on its own, users or firmware may do so - e.g. as an easy way to test the interrupt. Add preprocessor definition for MSF bit and include it in the irq bitmask to ensure minute and second interrupts are cleared when fired. This fixes an issue where the rtc enters a test mode and becomes unresponsive after a second interrupt has fired and is not cleared in time. In this state register writes to control registers have no effect and the interrupt line is kept asserted [1]: [1] userspace commands to put rtc into unresponsive state: $ i2cget -f -y 2 0x51 0x00 0x04 $ i2cset -f -y 2 0x51 0x00 0x05 # set bit 0 SI $ i2cget -f -y 2 0x51 0x00 0x84 # bit 8 EXT_TEST set $ i2cset -f -y 2 0x51 0x00 0x05 # try overwrite control register $ i2cget -f -y 2 0x51 0x00 0x84 # no change Signed-off-by: Josua Mayer <josua@solid-run.com> Reviewed-by: Bruno Thomsen <bruno.thomsen@gmail.com> Link: https://lore.kernel.org/r/20250825-rtc-irq-v1-1-0133319406a7@solid-run.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-09-16rtc: s3c: Drop support for S3C2410Krzysztof Kozlowski2-50/+2
Samsung S3C24xx family of SoCs was removed the Linux kernel in the commit 61b7f8920b17 ("ARM: s3c: remove all s3c24xx support"), in January 2023. There are no in-kernel users of remaining S3C24xx compatibles. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20250830130024.142815-5-krzysztof.kozlowski@linaro.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-09-16rtc: s3c: Drop unused definesKrzysztof Kozlowski1-16/+0
Drop defines for S3C2416 and S3C2443 SoCs which are not used anywhere. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20250830130024.142815-4-krzysztof.kozlowski@linaro.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-09-16rtc: Add Nuvoton NCT6694 RTC supportMing Yu3-0/+308
This driver supports RTC functionality for NCT6694 MFD device based on USB interface. Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: Ming Yu <a0282524688@gmail.com> Link: https://lore.kernel.org/r/20250912091952.1169369-8-a0282524688@gmail.com Signed-off-by: Lee Jones <lee@kernel.org>
2025-09-11mfd: input: rtc: mc13783: Remove deprecated mc13xxx_irq_ack()Alexander Kurz1-13/+0
mc13xxx_irq_ack() got deprecated and became dead code with commit 10f9edaeaa30 ("mfd: mc13xxx: Use regmap irq framework for interrupts"). It should be safe to remove it now. Signed-off-by: Alexander Kurz <akurz@blala.de> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Acked-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> # for input Link: https://lore.kernel.org/r/20250811064358.1659-1-akurz@blala.de Signed-off-by: Lee Jones <lee@kernel.org>
2025-08-04Merge tag 'rtc-6.17' of ↵Linus Torvalds17-195/+367
git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux Pull RTC updates from Alexandre Belloni: "Support for a new RTC in an existing driver and all the drivers exposing clocks using the common clock framework have been converted to determine_rate(). Summary: Subsystem: - Convert drivers exposing a clock from round_rate() to determine_rate() Drivers: - ds1307: oscillator stop flag handling for ds1341 - pcf85063: add support for RV8063" * tag 'rtc-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (34 commits) rtc: ds1685: Update Joshua Kinard's email address. rtc: rv3032: convert from round_rate() to determine_rate() rtc: rv3028: convert from round_rate() to determine_rate() rtc: pcf8563: convert from round_rate() to determine_rate() rtc: pcf85063: convert from round_rate() to determine_rate() rtc: nct3018y: convert from round_rate() to determine_rate() rtc: max31335: convert from round_rate() to determine_rate() rtc: m41t80: convert from round_rate() to determine_rate() rtc: hym8563: convert from round_rate() to determine_rate() rtc: ds1307: convert from round_rate() to determine_rate() rtc: rv3028: fix incorrect maximum clock rate handling rtc: pcf8563: fix incorrect maximum clock rate handling rtc: pcf85063: fix incorrect maximum clock rate handling rtc: nct3018y: fix incorrect maximum clock rate handling rtc: hym8563: fix incorrect maximum clock rate handling rtc: ds1307: fix incorrect maximum clock rate handling rtc: pcf85063: scope pcf85063_config structures rtc: Optimize calculations in rtc_time64_to_tm() dt-bindings: rtc: amlogic,a4-rtc: Add compatible string for C3 rtc: ds1307: handle oscillator stop flag (OSF) for ds1341 ...
2025-08-03rtc: ds1685: Update Joshua Kinard's email address.Joshua Kinard1-2/+2
I am switching my address to a personal domain, so need to update the driver's files and the entry in MAINTAINERS. Signed-off-by: Joshua Kinard <kumba@gentoo.org> Link: https://lore.kernel.org/r/20250721170051.32407-1-kumba@gentoo.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-08-03rtc: rv3032: convert from round_rate() to determine_rate()Brian Masney1-8/+13
The round_rate() clk ops is deprecated, so migrate this driver from round_rate() to determine_rate() using the Coccinelle semantic patch on the cover letter of this series. Signed-off-by: Brian Masney <bmasney@redhat.com> Link: https://lore.kernel.org/r/20250710-rtc-clk-round-rate-v1-15-33140bb2278e@redhat.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-08-03rtc: rv3028: convert from round_rate() to determine_rate()Brian Masney1-6/+11
The round_rate() clk ops is deprecated, so migrate this driver from round_rate() to determine_rate() using the Coccinelle semantic patch on the cover letter of this series. Signed-off-by: Brian Masney <bmasney@redhat.com> Link: https://lore.kernel.org/r/20250710-rtc-clk-round-rate-v1-14-33140bb2278e@redhat.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-08-03rtc: pcf8563: convert from round_rate() to determine_rate()Brian Masney1-6/+11
The round_rate() clk ops is deprecated, so migrate this driver from round_rate() to determine_rate() using the Coccinelle semantic patch on the cover letter of this series. Signed-off-by: Brian Masney <bmasney@redhat.com> Link: https://lore.kernel.org/r/20250710-rtc-clk-round-rate-v1-13-33140bb2278e@redhat.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-08-03rtc: pcf85063: convert from round_rate() to determine_rate()Brian Masney1-6/+11
The round_rate() clk ops is deprecated, so migrate this driver from round_rate() to determine_rate() using the Coccinelle semantic patch on the cover letter of this series. Signed-off-by: Brian Masney <bmasney@redhat.com> Link: https://lore.kernel.org/r/20250710-rtc-clk-round-rate-v1-12-33140bb2278e@redhat.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-08-03rtc: nct3018y: convert from round_rate() to determine_rate()Brian Masney1-6/+11
The round_rate() clk ops is deprecated, so migrate this driver from round_rate() to determine_rate() using the Coccinelle semantic patch on the cover letter of this series. Signed-off-by: Brian Masney <bmasney@redhat.com> Link: https://lore.kernel.org/r/20250710-rtc-clk-round-rate-v1-11-33140bb2278e@redhat.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-08-03rtc: max31335: convert from round_rate() to determine_rate()Brian Masney1-5/+7
The round_rate() clk ops is deprecated, so migrate this driver from round_rate() to determine_rate() using the Coccinelle semantic patch on the cover letter of this series. Signed-off-by: Brian Masney <bmasney@redhat.com> Link: https://lore.kernel.org/r/20250710-rtc-clk-round-rate-v1-10-33140bb2278e@redhat.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-08-03rtc: m41t80: convert from round_rate() to determine_rate()Brian Masney1-10/+11
The round_rate() clk ops is deprecated, so migrate this driver from round_rate() to determine_rate() using the Coccinelle semantic patch on the cover letter of this series. Signed-off-by: Brian Masney <bmasney@redhat.com> Link: https://lore.kernel.org/r/20250710-rtc-clk-round-rate-v1-9-33140bb2278e@redhat.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-08-03rtc: hym8563: convert from round_rate() to determine_rate()Brian Masney1-6/+11
The round_rate() clk ops is deprecated, so migrate this driver from round_rate() to determine_rate() using the Coccinelle semantic patch on the cover letter of this series. Signed-off-by: Brian Masney <bmasney@redhat.com> Link: https://lore.kernel.org/r/20250710-rtc-clk-round-rate-v1-8-33140bb2278e@redhat.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-08-03rtc: ds1307: convert from round_rate() to determine_rate()Brian Masney1-6/+11
The round_rate() clk ops is deprecated, so migrate this driver from round_rate() to determine_rate() using the Coccinelle semantic patch on the cover letter of this series. Signed-off-by: Brian Masney <bmasney@redhat.com> Link: https://lore.kernel.org/r/20250710-rtc-clk-round-rate-v1-7-33140bb2278e@redhat.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-08-03rtc: rv3028: fix incorrect maximum clock rate handlingBrian Masney1-1/+1
When rv3028_clkout_round_rate() is called with a requested rate higher than the highest supported rate, it currently returns 0, which disables the clock. According to the clk API, round_rate() should instead return the highest supported rate. Update the function to return the maximum supported rate in this case. Fixes: f583c341a515f ("rtc: rv3028: add clkout support") Signed-off-by: Brian Masney <bmasney@redhat.com> Link: https://lore.kernel.org/r/20250710-rtc-clk-round-rate-v1-6-33140bb2278e@redhat.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-08-03rtc: pcf8563: fix incorrect maximum clock rate handlingBrian Masney1-1/+1
When pcf8563_clkout_round_rate() is called with a requested rate higher than the highest supported rate, it currently returns 0, which disables the clock. According to the clk API, round_rate() should instead return the highest supported rate. Update the function to return the maximum supported rate in this case. Fixes: a39a6405d5f94 ("rtc: pcf8563: add CLKOUT to common clock framework") Signed-off-by: Brian Masney <bmasney@redhat.com> Link: https://lore.kernel.org/r/20250710-rtc-clk-round-rate-v1-5-33140bb2278e@redhat.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-08-03rtc: pcf85063: fix incorrect maximum clock rate handlingBrian Masney1-1/+1
When pcf85063_clkout_round_rate() is called with a requested rate higher than the highest supported rate, it currently returns 0, which disables the clock. According to the clk API, round_rate() should instead return the highest supported rate. Update the function to return the maximum supported rate in this case. Fixes: 8c229ab6048b7 ("rtc: pcf85063: Add pcf85063 clkout control to common clock framework") Signed-off-by: Brian Masney <bmasney@redhat.com> Link: https://lore.kernel.org/r/20250710-rtc-clk-round-rate-v1-4-33140bb2278e@redhat.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-08-03rtc: nct3018y: fix incorrect maximum clock rate handlingBrian Masney1-1/+1
When nct3018y_clkout_round_rate() is called with a requested rate higher than the highest supported rate, it currently returns 0, which disables the clock. According to the clk API, round_rate() should instead return the highest supported rate. Update the function to return the maximum supported rate in this case. Fixes: 5adbaed16cc63 ("rtc: Add NCT3018Y real time clock driver") Signed-off-by: Brian Masney <bmasney@redhat.com> Link: https://lore.kernel.org/r/20250710-rtc-clk-round-rate-v1-3-33140bb2278e@redhat.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-08-03rtc: hym8563: fix incorrect maximum clock rate handlingBrian Masney1-1/+1
When hym8563_clkout_round_rate() is called with a requested rate higher than the highest supported rate, it currently returns 0, which disables the clock. According to the clk API, round_rate() should instead return the highest supported rate. Update the function to return the maximum supported rate in this case. Fixes: dcaf038493525 ("rtc: add hym8563 rtc-driver") Signed-off-by: Brian Masney <bmasney@redhat.com> Link: https://lore.kernel.org/r/20250710-rtc-clk-round-rate-v1-2-33140bb2278e@redhat.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-08-03rtc: ds1307: fix incorrect maximum clock rate handlingBrian Masney1-1/+1
When ds3231_clk_sqw_round_rate() is called with a requested rate higher than the highest supported rate, it currently returns 0, which disables the clock. According to the clk API, round_rate() should instead return the highest supported rate. Update the function to return the maximum supported rate in this case. Fixes: 6c6ff145b3346 ("rtc: ds1307: add clock provider support for DS3231") Signed-off-by: Brian Masney <bmasney@redhat.com> Link: https://lore.kernel.org/r/20250710-rtc-clk-round-rate-v1-1-33140bb2278e@redhat.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-08-02Merge tag 'pinctrl-v6.17-1' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl Pull pin control updates from Linus Walleij: "Nothing stands out, apart from maybe the interesting Eswin EIC7700, a RISC-V SoC I've never seen before. Core changes: - Open code PINCTRL_FUNCTION_DESC() instead of defining a complex macro only used in one place - Add pinmux_generic_add_pinfunction() helper and use this in a few drivers New drivers: - Amlogic S7, S7D and S6 pin control support - Eswin EIC7700 pin control support - Qualcomm PMIV0104, PM7550 and Milos pin control support Because of unhelpful numbering schemes, the Qualcomm driver now needs to start to rely on SoC codenames - STM32 HDP pin control support - Mediatek MT8189 pin control support Improvements: - Switch remaining pin control drivers over to the new GPIO set callback that provides a return value - Support RSVD (reserved) pins in the STM32 driver - Move many fixed assignments over to pinctrl_desc definitions - Handle multiple TLMM regions in the Qualcomm driver" * tag 'pinctrl-v6.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl: (105 commits) pinctrl: mediatek: Add pinctrl driver for mt8189 dt-bindings: pinctrl: mediatek: Add support for mt8189 pinctrl: aspeed-g6: Add PCIe RC PERST pin group pinctrl: ingenic: use pinmux_generic_add_pinfunction() pinctrl: keembay: use pinmux_generic_add_pinfunction() pinctrl: mediatek: moore: use pinmux_generic_add_pinfunction() pinctrl: airoha: use pinmux_generic_add_pinfunction() pinctrl: equilibrium: use pinmux_generic_add_pinfunction() pinctrl: provide pinmux_generic_add_pinfunction() pinctrl: pinmux: open-code PINCTRL_FUNCTION_DESC() pinctrl: ma35: use new GPIO line value setter callbacks MAINTAINERS: add Clément Le Goffic as STM32 HDP maintainer pinctrl: stm32: Introduce HDP driver dt-bindings: pinctrl: stm32: Introduce HDP pinctrl: qcom: Add Milos pinctrl driver dt-bindings: pinctrl: document the Milos Top Level Mode Multiplexer pinctrl: qcom: spmi: Add PM7550 dt-bindings: pinctrl: qcom,pmic-gpio: Add PM7550 support pinctrl: qcom: spmi: Add PMIV0104 dt-bindings: pinctrl: qcom,pmic-gpio: Add PMIV0104 support ...
2025-07-27rtc: pcf85063: scope pcf85063_config structuresAlexandre Belloni1-47/+47
Fix possible warning: >> drivers/rtc/rtc-pcf85063.c:566:37: warning: unused variable 'config_rv8063' [-Wunused-const-variable] 566 | static const struct pcf85063_config config_rv8063 = { | ^~~~~~~~~~~~~ Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202507241607.dmz2qrO5-lkp@intel.com/ Link: https://lore.kernel.org/r/20250724090420.917705-1-alexandre.belloni@bootlin.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-07-24rtc: Optimize calculations in rtc_time64_to_tm()Uwe Kleine-König1-21/+19
Recently (in commit 7df4cfef8b35 ("rtc: Make rtc_time64_to_tm() support dates before 1970")) the function rtc_time64_to_tm() was repaired for times before 1970. This introduced two if blocks. Cassio Neri pointed out that to be not neccessary and suggested an adaption that allows to drop the two branch points again. This is implemented here. Also adapt the reference to the theoretical paper to link to the final published article instead of the preprint on Cassio's request. Suggested-by: Cassio Neri <cassio.neri@gmail.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com> Link: https://lore.kernel.org/r/20250613142405.253420-2-u.kleine-koenig@baylibre.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-07-24rtc: ds1307: handle oscillator stop flag (OSF) for ds1341Meagan Lloyd1-0/+11
In using CONFIG_RTC_HCTOSYS, rtc_hctosys() will sync the RTC time to the kernel time as long as rtc_read_time() succeeds. In some power loss situations, our supercapacitor-backed DS1342 RTC comes up with either an unpredictable future time or the default 01/01/00 from the datasheet. The oscillator stop flag (OSF) is set in these scenarios due to the power loss and can be used to determine the validity of the RTC data. This change expands the oscillator stop flag (OSF) handling that has already been implemented for some chips to the ds1341 chip (DS1341 and DS1342 share a datasheet). This handling manages the validity of the RTC data in .read_time and .set_time based on the OSF. Signed-off-by: Meagan Lloyd <meaganlloyd@linux.microsoft.com> Reviewed-by: Tyler Hicks <code@tyhicks.com> Acked-by: Rodolfo Giometti <giometti@enneenne.com> Link: https://lore.kernel.org/r/1749665656-30108-3-git-send-email-meaganlloyd@linux.microsoft.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-07-24rtc: ds1307: remove clear of oscillator stop flag (OSF) in probeMeagan Lloyd1-3/+1
In using CONFIG_RTC_HCTOSYS, rtc_hctosys() will sync the RTC time to the kernel time as long as rtc_read_time() succeeds. In some power loss situations, our supercapacitor-backed DS1342 RTC comes up with either an unpredictable future time or the default 01/01/00 from the datasheet. The oscillator stop flag (OSF) is set in these scenarios due to the power loss and can be used to determine the validity of the RTC data. Some chip types in the ds1307 driver already have OSF handling to determine whether .read_time provides valid RTC data or returns -EINVAL. This change removes the clear of the OSF in .probe as the OSF needs to be preserved to expand the OSF handling to the ds1341 chip type (note that DS1341 and DS1342 share a datasheet). Signed-off-by: Meagan Lloyd <meaganlloyd@linux.microsoft.com> Reviewed-by: Tyler Hicks <code@tyhicks.com> Acked-by: Rodolfo Giometti <giometti@enneenne.com> Link: https://lore.kernel.org/r/1749665656-30108-2-git-send-email-meaganlloyd@linux.microsoft.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-07-23rtc: pcf85063: add support for RV8063Antoni Pokusinski2-10/+98
Microcrystal RV8063 is a real-time clock with SPI interface. Its functionality is very similar to the RV8263 rtc. Signed-off-by: Antoni Pokusinski <apokusinski01@gmail.com> Link: https://lore.kernel.org/r/20250413130755.159373-4-apokusinski01@gmail.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-07-23rtc: pcf85063: create pcf85063_i2c_probeAntoni Pokusinski1-27/+70
Move the i2c-specific code from pcf85063_probe to the newly created function. This is a preparation for introducing the support for RV8063 real-time clock with SPI interface. Signed-off-by: Antoni Pokusinski <apokusinski01@gmail.com> Link: https://lore.kernel.org/r/20250413130755.159373-3-apokusinski01@gmail.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-07-23rtc: s3c: Put 'const' just after 'static' keyword for dataKrzysztof Kozlowski1-4/+4
Convention is to define static data as 'static const ...', not 'static ... const' because of readability, even if the code is functionally equal. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20250707092200.48862-2-krzysztof.kozlowski@linaro.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-07-23rtc: m41t80: remove HT feature for m41t65Alexander Shiyan1-2/+2
The M41T65 device does not support the "Halt Update Bit" (HT) feature as per its datasheet. This aligns the driver with the actual hardware capabilities. Signed-off-by: Alexander Shiyan <eagle.alexander923@gmail.com> Link: https://lore.kernel.org/r/20250704091144.45389-1-eagle.alexander923@gmail.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-07-22rtc: sysfs: use __ATTRIBUTE_GROUPS()Andy Shevchenko1-5/+1
Embrace __ATTRIBUTE_GROUPS() to avoid boiler plate code. This should not introduce any functional changes. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20250702080108.2722905-1-andriy.shevchenko@linux.intel.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-07-22rtc: sysfs: Bail out earlier if no new groups providedAndy Shevchenko1-4/+8
When there is no new groups provided, no need to reallocate memory, copy the old ones and free them in order to do nothing. Do nothing instead. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20250702073224.2684097-1-andriy.shevchenko@linux.intel.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-07-22rtc: sysfs: Use sysfs_emit() to instead of s*printf()Andy Shevchenko1-25/+21
Follow the advice of the Documentation/filesystems/sysfs.rst that show() should only use sysfs_emit() or sysfs_emit_at() when formatting the value to be returned to user space. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20250702061534.2670729-1-andriy.shevchenko@linux.intel.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-07-22rtc: sh: Convert to DEFINE_SIMPLE_DEV_PM_OPS()Geert Uytterhoeven1-4/+4
Convert the Renesas SuperH On-Chip RTC driver from SIMPLE_DEV_PM_OPS() to DEFINE_SIMPLE_DEV_PM_OPS() and pm_sleep_ptr(). This lets us drop the __maybe_unused annotations from its suspend and resume callbacks, and reduces kernel size in case CONFIG_PM or CONFIG_PM_SLEEP is disabled. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lore.kernel.org/r/396d4a769b8d3c6fec43c65022cdfd8a6854524a.1752086758.git.geert+renesas@glider.be Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-07-22rtc: Rename lib_test to test_rtc_libGeert Uytterhoeven2-1/+1
When compiling the RTC library functions test as a module, the module has the non-descriptive name "lib_test.ko". Fix this by renaming it to "test_rtc_lib.ko". Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Link: https://lore.kernel.org/r/47019d7f8ced12107b54a372fdf34b1b8f7b6183.1751355848.git.geert@linux-m68k.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-06-24rtc: pcf2127: add missing semicolon after statementHugo Villeneuve1-1/+1
Replace comma with semicolon at the end of the statement when setting config.max_register. Fixes: fd28ceb4603f ("rtc: pcf2127: add variant-specific configuration structure") Cc: stable@vger.kernel.org Cc: Elena Popa <elena.popa@nxp.com> Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com> Link: https://lore.kernel.org/r/20250529202923.1552560-1-hugo@hugovil.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-06-24rtc: pcf2127: fix SPI command byte for PCF2131Elena Popa1-0/+5
PCF2131 was not responding to read/write operations using SPI. PCF2131 has a different command byte definition, compared to PCF2127/29. Added the new command byte definition when PCF2131 is detected. Fixes: afc505bf9039 ("rtc: pcf2127: add support for PCF2131 RTC") Cc: stable@vger.kernel.org Signed-off-by: Elena Popa <elena.popa@nxp.com> Acked-by: Hugo Villeneuve <hvilleneuve@dimonoff.com> Link: https://lore.kernel.org/r/20250530104001.957977-1-elena.popa@nxp.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-06-24rtc: cmos: use spin_lock_irqsave in cmos_interruptMateusz Jończyk1-4/+6
cmos_interrupt() can be called in a non-interrupt context, such as in an ACPI event handler (which runs in an interrupt thread). Therefore, usage of spin_lock(&rtc_lock) is insecure. Use spin_lock_irqsave() / spin_unlock_irqrestore() instead. Before a misguided commit 6950d046eb6e ("rtc: cmos: Replace spin_lock_irqsave with spin_lock in hard IRQ") the cmos_interrupt() function used spin_lock_irqsave(). That commit changed it to spin_lock() and broke locking, which was partially fixed in commit 13be2efc390a ("rtc: cmos: Disable irq around direct invocation of cmos_interrupt()") That second commit did not take account of the ACPI fixed event handler pathway, however. It introduced local_irq_disable() workarounds in cmos_check_wkalrm(), which can cause problems on PREEMPT_RT kernels and are now unnecessary. Add an explicit comment so that this change will not be reverted by mistake. Cc: stable@vger.kernel.org Fixes: 6950d046eb6e ("rtc: cmos: Replace spin_lock_irqsave with spin_lock in hard IRQ") Signed-off-by: Mateusz Jończyk <mat.jonczyk@o2.pl> Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Tested-by: Chris Bainbridge <chris.bainbridge@gmail.com> Reported-by: Chris Bainbridge <chris.bainbridge@gmail.com> Closes: https://lore.kernel.org/all/aDtJ92foPUYmGheF@debian.local/ Link: https://lore.kernel.org/r/20250607210608.14835-1-mat.jonczyk@o2.pl Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-06-24rtc: s5m: replace open-coded read/modify/write registers with regmap helpersAndré Draszik1-21/+7
Instead of the open-coded read/modify/write sequence, we can simply use the regmap helpers regmap_set_bits() and regmap_update_bits() respectively. This makes the code easier to read, and avoids extra work in case the underlying bus supports updating bits via struct regmap_bus::reg_update_bits() directly (which is the case for S2MPG10 on gs101 where this driver communicates via ACPM). Signed-off-by: André Draszik <andre.draszik@linaro.org> Link: https://lore.kernel.org/r/20250409-s2mpg10-v4-31-d66d5f39b6bf@linaro.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2025-06-24rtc: s5m: replace regmap_update_bits with regmap_clear/set_bitsAndré Draszik1-6/+4
The regmap_clear_bits() and regmap_set_bits() helper macros state the intention a bit more obviously. Use those. Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Signed-off-by: André Draszik <andre.draszik@linaro.org> Link: https://lore.kernel.org/r/20250409-s2mpg10-v4-30-d66d5f39b6bf@linaro.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
generated by cgit v1.2.3 (git 2.39.0) at 2026-05-03 03:38:37 +0300