[RFC 00/10] irqchip: meson: add support for the gpio interrupt controller

[jbrunet@baylibre.com (Jerome Brunet)]

This patch series adds support for the GPIO interrupt controller found
on Amlogic's meson SoC families.

Unlike what the name suggests, this controller is not part of the SoC GPIO
subsystem. It's an indepedent controller which can watch almost all pad of
the SoC and generate and interrupt from it. Some pins, which are not part
of the public datasheet, don't seem to have this capability though.

Hardware wise, the controller is a 256 to 8 multiplexer. It can take up
to 256 input pads and route them to any of 8 GIC's interrupts. There is also
a filter block in the middle to select the appropriate edge or level.

The number of interrupt declared by the irqchip is lowered from 256 to the
actual number of signal routed to the controller on each SoC family. As we
have access to only 8 GIC?s interrupts, these are allocated when an
interrupt is requested from the controller, on a first come, first served
basis.

This series has been tested on Amlogic S905-P200 board with the front
panel power button. Directly passing an IRQ or using gpio_to_irq both work
with this driver.

This work is derived from the previous work of Carlo Caione [1].

http://lkml.kernel.org/r/1448987062-31225-1-git-send-email-carlo at caione.org

Note:
As the comment will explain, patch 10 is not strictly required but would
be an appreciated bonus.

Jerome Brunet (10):
  irqchip: meson: add support for gpio interrupt controller
  dt-bindings: interrupt-controller: add DT binding for meson GPIO
    interrupt controller
  pinctrl: meson: update pinctrl data with gpio irq base number
  pinctrl: meson: allow gpio to request irq
  dt-bindings: pinctrl: meson: update gpio dt-bindings
  ARM64: meson: enable MESON_IRQ_GPIO in Kconfig
  ARM: meson: enable MESON_IRQ_GPIO in Kconfig for meson8
  ARM64: dts: amlogic: enable gpio interrupt controller on gxbb
  ARM: dts: amlogic: enable gpio interrupt controller on meson8
  irqchip: meson: Add support for IRQ_TYPE_EDGE_BOTH

 .../amlogic,meson-gpio-intc.txt                    |  39 ++
 .../devicetree/bindings/pinctrl/meson,pinctrl.txt  |   4 +
 arch/arm/boot/dts/meson8.dtsi                      |  19 +
 arch/arm/boot/dts/meson8b.dtsi                     |  19 +
 arch/arm/mach-meson/Kconfig                        |   2 +
 arch/arm64/Kconfig.platforms                       |   1 +
 arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi        |  17 +
 drivers/irqchip/Kconfig                            |   9 +
 drivers/irqchip/Makefile                           |   1 +
 drivers/irqchip/irq-meson-gpio.c                   | 437 +++++++++++++++++++++
 drivers/pinctrl/Kconfig                            |   2 +
 drivers/pinctrl/meson/pinctrl-meson-gxbb.c         |  22 +-
 drivers/pinctrl/meson/pinctrl-meson.c              |  83 +++-
 drivers/pinctrl/meson/pinctrl-meson.h              |  16 +-
 drivers/pinctrl/meson/pinctrl-meson8.c             |  20 +-
 drivers/pinctrl/meson/pinctrl-meson8b.c            |  32 +-
 16 files changed, 686 insertions(+), 37 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/amlogic,meson-gpio-intc.txt
 create mode 100644 drivers/irqchip/irq-meson-gpio.c

-- 
2.7.4