Initial support for ROHM BD9576MUF and BD9573MUF PMICs. These PMICs are primarily intended to be used to power the R-Car family processors. BD9576MUF includes some additional safety features the BD9573MUF does not have. This initial version of drivers provides temperature, over voltage and under voltage warnings is IRQ information is passed via DT. This patch series includes MFD and watchdog drivers. Regulator part was already applied but this series brings the over-/undervoltage and temperature error notifications which consumer drivers can utilize. WDG supports - Enabling and pinging the watchdog - configuring watchog timeout / window from device-tree BD9576MUF and BD9573MUF are designed to keep the IRQ line low for whole duration of error condition. Yet the IRQ must be acked before line is pulled low. This means that handling the IRQ as edge triggered IRQ will introduce the classic race of new IRQ occurring while one is handled. (New status bit being set just after status was read but before it was acked. That will cause the new IRQ to not be acked which leaves the IRQ line low. With edge triggered IRQs this means that no more edges will be seen.) In order to prevent the processor from staying in IRQ handling loop we only handle the main status register with regmap IRQ irq-controller (main status bits can be masked) but leave the sub-status bits (some of which can't be masked) to be handled by the IRQ handlers. When regulator driver handler is run, it will 'increase the depth' of IRQ disabling (causing main status bit to stay masked when handler exits) and arms a 1sec delayed_work to do unmasking. I am open to suggestions as how to handle this more elegantly. Please note that the BD9573 does not offer 'warning' interrupts and will only generate IRQ when it is entering into emergency state and shutting down the power from the SOC. This far the IRQ logic has only received a limited amount of testing. I managed to get the OVD/UVD condition by probing break-out board manually. This however usually did lead the PMIC to go to emergency state so there may be corner cases not covered by my tests. Basic IRQ limiting seems to be working though. Please note that not all of the boards are expected to be utilizing the warning IRQs. Thus populating the IRQ information from DT is optional. Changelog v7: - Added interrupt handling - Added notifications and error_flag getter to regulators Changelog v6: - Fixed watchdog timeout Changelog v5: - rebased on top of v5.10-rc2 - few styling fixes in MFD as suggested by Lee Changelog v4: - rebased on top of 5.10-rc1 - Fix typo (repeated word maximum) from the DT binding doc Changelog v3: - use only one binding to specify watchdog time-out window. Changelog v2: - dropped already applied regulator part - dt_bindings: Fix case for regulator-names in the example - watchdod: unify probe error check and revise includes --- Matti Vaittinen (6): dt_bindings: mfd: Add ROHM BD9576MUF and BD9573MUF PMICs mfd: Support ROHM BD9576MUF and BD9573MUF mfd: bd9576: Add IRQ support wdt: Support wdt on ROHM BD9576MUF and BD9573MUF MAINTAINERS: Add ROHM BD9576MUF and BD9573MUF drivers regulator: bd9576: Support error reporting .../bindings/mfd/rohm,bd9576-pmic.yaml | 123 ++++ MAINTAINERS | 4 + drivers/mfd/Kconfig | 11 + drivers/mfd/Makefile | 1 + drivers/mfd/rohm-bd9576.c | 186 ++++++ drivers/regulator/bd9576-regulator.c | 534 ++++++++++++++---- drivers/watchdog/Kconfig | 13 + drivers/watchdog/Makefile | 1 + drivers/watchdog/bd9576_wdt.c | 291 ++++++++++ include/linux/mfd/rohm-bd957x.h | 121 ++++ include/linux/mfd/rohm-generic.h | 2 + 11 files changed, 1165 insertions(+), 122 deletions(-) create mode 100644 Documentation/devicetree/bindings/mfd/rohm,bd9576-pmic.yaml create mode 100644 drivers/mfd/rohm-bd9576.c create mode 100644 drivers/watchdog/bd9576_wdt.c create mode 100644 include/linux/mfd/rohm-bd957x.h base-commit: 7c53f6b671f4aba70ff15e1b05148b10d58c2837 -- 2.25.4 -- Matti Vaittinen, Linux device drivers ROHM Semiconductors, Finland SWDC Kiviharjunlenkki 1E 90220 OULU FINLAND ~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~ Simon says - in Latin please. ~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~ Thanks to Simon Glass for the translation =]
