• Linus Torvalds's avatar
    Merge tag 'gpio-v4.15-1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio · 6aa2f944
    Linus Torvalds authored
    Pull GPIO updates from Linus Walleij:
     "This is the bulk of GPIO changes for the v4.15 kernel cycle:
    
      Core:
    
       - Fix the semantics of raw GPIO to actually be raw. No inversion
         semantics as before, but also no open draining, and allow the raw
         operations to affect lines used for interrupts as the caller
         supposedly knows what they are doing if they are getting the big
         hammer.
    
       - Rewrote the __inner_function() notation calls to names that make
         more sense. I just find this kind of code disturbing.
    
       - Drop the .irq_base() field from the gpiochip since now all IRQs are
         mapped dynamically. This is nice.
    
       - Support for .get_multiple() in the core driver API. This allows us
         to read several GPIO lines with a single register read. This has
         high value for some usecases: it can be used to create
         oscilloscopes and signal analyzers and other things that rely on
         reading several lines at exactly the same instant. Also a generally
         nice optimization. This uses the new assign_bit() macro from the
         bitops lib that was ACKed by Andrew Morton and is implemented for
         two drivers, one of them being the generic MMIO driver so everyone
         using that will be able to benefit from this.
    
       - Do not allow requests of Open Drain and Open Source setting of a
         GPIO line simultaneously. If the hardware actually supports
         enabling both at the same time the electrical result would be
         disastrous.
    
       - A new interrupt chip core helper. This will be helpful to deal with
         "banked" GPIOs, which means GPIO controllers with several logical
         blocks of GPIO inside them. This is several gpiochips per device in
         the device model, in contrast to the case when there is a 1-to-1
         relationship between a device and a gpiochip.
    
      New drivers:
    
       - Maxim MAX3191x industrial serializer, a very interesting piece of
         professional I/O hardware.
    
       - Uniphier GPIO driver. This is the GPIO block from the recent
         Socionext (ex Fujitsu and Panasonic) platform.
    
       - Tegra 186 driver. This is based on the new banked GPIO
         infrastructure.
    
      Other improvements:
    
       - Some documentation improvements.
    
       - Wakeup support for the DesignWare DWAPB GPIO controller.
    
       - Reset line support on the DesignWare DWAPB GPIO controller.
    
       - Several non-critical bug fixes and improvements for the Broadcom
         BRCMSTB driver.
    
       - Misc non-critical bug fixes like exotic errorpaths, removal of dead
         code etc.
    
       - Explicit comments on fall-through switch() statements"
    
    * tag 'gpio-v4.15-1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (65 commits)
      gpio: tegra186: Remove tegra186_gpio_lock_class
      gpio: rcar: Add r8a77995 (R-Car D3) support
      pinctrl: bcm2835: Fix some merge fallout
      gpio: Fix undefined lock_dep_class
      gpio: Automatically add lockdep keys
      gpio: Introduce struct gpio_irq_chip.first
      gpio: Disambiguate struct gpio_irq_chip.nested
      gpio: Add Tegra186 support
      gpio: Export gpiochip_irq_{map,unmap}()
      gpio: Implement tighter IRQ chip integration
      gpio: Move lock_key into struct gpio_irq_chip
      gpio: Move irq_valid_mask into struct gpio_irq_chip
      gpio: Move irq_nested into struct gpio_irq_chip
      gpio: Move irq_chained_parent to struct gpio_irq_chip
      gpio: Move irq_default_type to struct gpio_irq_chip
      gpio: Move irq_handler to struct gpio_irq_chip
      gpio: Move irqdomain into struct gpio_irq_chip
      gpio: Move irqchip into struct gpio_irq_chip
      gpio: Introduce struct gpio_irq_chip
      pinctrl: armada-37xx: remove unused variable
      ...
    6aa2f944
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