• Linus Torvalds's avatar
    Merge tag 'gpio-v4.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio · 114b5f8f
    Linus Torvalds authored
    Pull GPIO updates from Linus Walleij:
     "This is the bulk of GPIO changes for the v4.20 series:
      Core changes:
       - A patch series from Hans Verkuil to make it possible to
         enable/disable IRQs on a GPIO line at runtime and drive GPIO lines
         as output without having to put/get them from scratch.
         The irqchip callbacks have been improved so that they can use only
         the fastpatch callbacks to enable/disable irqs like any normal
         irqchip, especially the gpiod_lock_as_irq() has been improved to be
         callable in fastpath context.
         A bunch of rework had to be done to achieve this but it is a big
         win since I never liked to restrict this to slowpath. The only call
         requireing slowpath was try_module_get() and this is kept at the
         .request_resources() slowpath callback. In the GPIO CEC driver this
         is a big win sine a single line is used for both outgoing and
         incoming traffic, and this needs to use IRQs for incoming traffic
         while actively driving the line for outgoing traffic.
       - Janusz Krzysztofik improved the GPIO array API to pass a "cookie"
         (struct gpio_array) and a bitmap for setting or getting multiple
         GPIO lines at once.
         This improvement orginated in a specific need to speed up an OMAP1
         driver and has led to a much better API and real performance gains
         when the state of the array can be used to bypass a lot of checks
         and code when we want things to go really fast.
         The previous code would minimize the number of calls down to the
         driver callbacks assuming the CPU speed was orders of magnitude
         faster than the I/O latency, but this assumption was wrong on
         several platforms: what we needed to do was to profile and improve
         the speed on the hot path of the array functions and this change is
         now completed.
       - Clean out the painful and hard to grasp BNF experiments from the
         device tree bindings. Future approaches are looking into using JSON
         schema for this purpose. (Rob Herring is floating a patch series.)
      New drivers:
       - The RCAR driver now supports r8a774a1 (RZ/G2M).
       - Synopsys GPIO via CREGs driver.
      Major improvements:
       - Modernization of the EP93xx driver to use irqdomain and other
         contemporary concepts.
       - The ingenic driver has been merged into the Ingenic pin control
         driver and removed from the GPIO subsystem.
       - Debounce support in the ftgpio010 driver"
    * tag 'gpio-v4.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (116 commits)
      gpio: Clarify kerneldoc on gpiochip_set_chained_irqchip()
      gpio: Remove unused 'irqchip' argument to gpiochip_set_cascaded_irqchip()
      gpio: Drop parent irq assignment during cascade setup
      mmc: pwrseq_simple: Fix incorrect handling of GPIO bitmap
      gpio: fix SNPS_CREG kconfig dependency warning
      gpiolib: Initialize gdev field before is used
      gpio: fix kernel-doc after devres.c file rename
      gpio: fix doc string for devm_gpiochip_add_data() to not talk about irq_chip
      gpio: syscon: Fix possible NULL ptr usage
      gpiolib: Show correct direction from the beginning
      pinctrl: msm: Use init_valid_mask exported function
      gpiolib: Add init_valid_mask exported function
      GPIO: add single-register GPIO via CREG driver
      dt-bindings: Document the Synopsys GPIO via CREG bindings
      gpio: mockup: use device properties instead of platform_data
      gpio: Slightly more helpful debugfs
      gpio: omap: Remove set but not used variable 'dev'
      gpio: omap: drop omap_gpio_list
      Accept partial 'gpio-line-names' property.
      gpio: omap: get rid of the conditional PM runtime calls
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