Hi, this small series adds a generic gpio-based brownout detection driver to inform the userspace that something went wrong. Additional there is a optional support to release devices from their drivers, because there are board power designs which cut of external devices supply immediately and keep the host (SoC) alive for a few seconds to switch into a safe state. Due to the hard power cut some external devices throw interrupts and depending of the amount of external devices these interrupts will flood the host. The driver unloads all specified devices from their drivers so the interrupts are ignored. At the moment only spi and i2c devices are supported. I've tested the driver on a customer arm based board, but other testers are welcome. Maybe there are problems unloading device drivers which have a incorrect .remove() or devm_alloc() order. Then these drivers must be fixed. Regards, Marco Marco Felsch (3): spi: switch to SPDX license identifier spi: make OF helper available for others Input: add generic gpio brownout driver .../bindings/input/gpio-brownout.txt | 36 ++++ drivers/input/misc/Kconfig | 12 ++ drivers/input/misc/Makefile | 1 + drivers/input/misc/gpio-brownout.c | 166 ++++++++++++++++++ drivers/spi/spi.c | 18 +- include/linux/spi/spi.h | 30 ++-- 6 files changed, 239 insertions(+), 24 deletions(-) create mode 100644 Documentation/devicetree/bindings/input/gpio-brownout.txt create mode 100644 drivers/input/misc/gpio-brownout.c -- 2.19.0
