kernel/linux.git/drivers/rtc/rtc-stm32.c, branch v6.18.22

rtc: stm32: Constify static 'pinctrl_desc'

2025-06-18T11:26:37+00:00

The local static 'struct pinctrl_desc' is not modified, so can be made const for code safety. Signed-off-by: Krzysztof Kozlowski Acked-by: Alexandre Belloni Link: https://lore.kernel.org/20250611-pinctrl-const-desc-v2-17-b11c1d650384@linaro.org Signed-off-by: Linus Walleij

rtc: stm32: drop unused module alias

2025-05-24T21:58:24+00:00

The driver only support OF probe so drop the unused platform module alias. Fixes: 4e64350f42e2 ("rtc: add STM32 RTC driver") Signed-off-by: Johan Hovold Reviewed-by: Krzysztof Kozlowski Link: https://lore.kernel.org/r/20250423130318.31244-8-johan+linaro@kernel.org Signed-off-by: Alexandre Belloni

rtc: stm32: Use resource managed API to simplify code

2025-03-03T21:52:29+00:00

Use devm_pm_set_wake_irq and devm_device_init_wakeup to cleanup the error handling code and 'driver.remove()' hook. Reviewed-by: Antonio Borneo Signed-off-by: Peng Fan Link: https://lore.kernel.org/r/20250205-rtc-cleanup-v1-1-66165678e089@nxp.com Signed-off-by: Alexandre Belloni

rtc: stm32: Use syscon_regmap_lookup_by_phandle_args

2025-01-13T08:33:39+00:00

Use syscon_regmap_lookup_by_phandle_args() which is a wrapper over syscon_regmap_lookup_by_phandle() combined with getting the syscon argument. Except simpler code this annotates within one line that given phandle has arguments, so grepping for code would be easier. There is also no real benefit in printing errors on missing syscon argument, because this is done just too late: runtime check on static/build-time data. Dtschema and Devicetree bindings offer the static/build-time check for this already. Signed-off-by: Krzysztof Kozlowski Link: https://lore.kernel.org/r/20250111185405.183824-1-krzysztof.kozlowski@linaro.org Signed-off-by: Alexandre Belloni

rtc: Switch back to struct platform_driver::remove()

2024-11-10T21:58:28+00:00

After commit 0edb555a65d1 ("platform: Make platform_driver::remove() return void") .remove() is (again) the right callback to implement for platform drivers. Convert all platform drivers below drivers/rtc to use .remove(), with the eventual goal to drop struct platform_driver::remove_new(). As .remove() and .remove_new() have the same prototypes, conversion is done by just changing the structure member name in the driver initializer. Signed-off-by: Uwe Kleine-König Link: https://lore.kernel.org/r/20241007205803.444994-6-u.kleine-koenig@baylibre.com Signed-off-by: Alexandre Belloni

rtc: stm32: add alarm A out feature

2024-08-14T09:37:07+00:00

STM32 RTC can pulse some SOC pins when an RTC alarm expires. This patch adds this functionality for alarm A. The pulse can out on three pins RTC_OUT1, RTC_OUT2, RTC_OUT2_RMP (PC13, PB2, PI8 on stm32mp15) (PC13, PB2, PI1 on stm32mp13) (PC13, PF4/PF6, PI8 on stm32mp25). This patch only adds the functionality for devices which are using st,stm32mp1-rtc and st,stm32mp25-rtc compatible. Add "alarm-a" in pinmux functions. Signed-off-by: Valentin Caron Reviewed-by: Linus Walleij Link: https://lore.kernel.org/r/20240722160022.454226-5-valentin.caron@foss.st.com Signed-off-by: Alexandre Belloni

rtc: stm32: add Low Speed Clock Output (LSCO) support

2024-08-14T09:37:07+00:00

RTC is able to output on a pin the "LSE" internal clock. STM32 RTC is now registered as a clock provider. It provides rtc_lsco clock, that means RTC_LSCO is output on either RTC_OUT1 or RTC_OUT2_RMP, depending on pinmux DT property. The clock is marked as CLK_IGNORE_UNUSED and CLK_IS_CRITICAL because RTC_LSCO can be early required by devices needed it to init. Add LSCO in pinmux functions. Add "stm32_rtc_clean_outs" to disable LSCO. As RTC is part of "backup" power domain, it is not reset during shutdown or reboot. So force LSCO disable at probe. Co-developed-by: Amelie Delaunay Signed-off-by: Amelie Delaunay Signed-off-by: Valentin Caron Link: https://lore.kernel.org/r/20240722160022.454226-4-valentin.caron@foss.st.com Signed-off-by: Alexandre Belloni

rtc: stm32: add pinctrl and pinmux interfaces

2024-08-14T09:37:07+00:00

STM32 RTC is capable to handle 3 specific pins of the soc. "out1, out2 and out2_rmp". To handle this, we use pinctrl framework. There is a single pin per group. Signed-off-by: Valentin Caron Reviewed-by: Linus Walleij Link: https://lore.kernel.org/r/20240722160022.454226-3-valentin.caron@foss.st.com Signed-off-by: Alexandre Belloni

rtc: stm32: add new st,stm32mp25-rtc compatible and check RIF configuration

2024-07-10T15:15:33+00:00

Introduce new st,stm32mp25-rtc compatible. It is based on st,stm32mp1-rtc. Difference is that stm32mp25 soc implements a triple protection on RTC registers: - Secure bit based protection - Privileged context based protection - Compartment ID filtering based protection This driver will now check theses configurations before probing to avoid exceptions and fake reads on register. At this time, driver needs only to check two resources: INIT and ALARM_A. Other resources are not used. Resource isolation framework (RIF) is a comprehensive set of hardware blocks designed to enforce and manage isolation of STM32 hardware resources, like memory and peripherals. Link: https://www.st.com/resource/en/reference_manual/rm0457-stm32mp25xx-advanced-armbased-3264bit-mpus-stmicroelectronics.pdf#page=4081 Signed-off-by: Valentin Caron Link: https://lore.kernel.org/r/20240708153434.416287-3-valentin.caron@foss.st.com Signed-off-by: Alexandre Belloni

rtc: stm32: Use NOIRQ_SYSTEM_SLEEP_PM_OPS()

2023-08-16T22:53:00+00:00

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 Reviewed-by: Arnd Bergmann Link: https://lore.kernel.org/r/20230815-rtc-stm32-unused-pm-funcs-v1-1-82eb8e02d903@kernel.org Signed-off-by: Alexandre Belloni