GPIO driver for Maxim MAX31910, MAX31911, MAX31912, MAX31913, MAX31953 and MAX31963 industrial serializer, a daisy-chainable chip to make 8 digital 24V inputs available via SPI. Supports CRC checksums to guard against electromagnetic interference, as well as undervoltage and overtemperature detection. The chip is used by the "Revolution Pi" family of open source PLCs based on the Raspberry Pi (https://revolution.kunbus.com/). In a typical SCADA system, all input signals are read periodically, say, every 5 or 10 ms, and stored in a so-called "process image". To make this perform well with serializers, add a ->get_multiple callback to struct gpio_chip, add corresponding consumer functions and wire it up with linehandle_ioctl(). Thanks, Lukas Lukas Wunner (4): bitops: Introduce assign_bit() gpio: Introduce ->get_multiple callback dt-bindings: gpio: max3191x: Document new driver gpio: Add driver for Maxim MAX3191x industrial serializer .../devicetree/bindings/gpio/gpio-max3191x.txt | 37 ++ drivers/gpio/Kconfig | 10 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-max3191x.c | 482 +++++++++++++++++++++ drivers/gpio/gpiolib.c | 181 +++++++- drivers/gpio/gpiolib.h | 4 + drivers/md/dm-mpath.c | 8 - include/linux/bitops.h | 24 + include/linux/gpio/consumer.h | 44 ++ include/linux/gpio/driver.h | 5 + 10 files changed, 777 insertions(+), 19 deletions(-) create mode 100644 Documentation/devicetree/bindings/gpio/gpio-max3191x.txt create mode 100644 drivers/gpio/gpio-max3191x.c -- 2.11.0 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
