[RFC v4 0/2] gpio: add DT support for basic memory-mapped GPIOs

[Christian Lamparter <chunkeey-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>]

This patch series adds device tree support for basic memory-mapped GPIOs.
The GPIO library already allows drivers and architecture support code to
reuse generic code for manageing a GPIO chip. Currently, a developer has
to create a platform device "basic-mmio-gpio" and attach a bgpio_pdata
platform data structure to make use of it. However, for architectures
which rely on the device tree to enumerate devices, creating custom
platform devices is another extra step that can be avoided by having
direct support via a device tree binding.

I initially came across this patch [0] from Álvaro Fernández Rojas,
while looking for an easy way to add support for the GPIO of my
WD MyBook Live [1] (APM82181 - ppc464). This generic approach patch
allowed me to easily get the GPIO (and the connected LEDs,
buttons, gpiohogs, etc.) up and running. Even tought, Mr. Fernandez
initially developed it for his work on the brcm63xx [2].

[0] <https://patchwork.ozlabs.org/patch/422121/>
[1] <https://github.com/chunkeey/MBL-openwrt>
[2] <https://wiki.openwrt.org/doc/hardware/soc/soc.broadcom.bcm63xx>

---
Note: Since it was such a long time ago, I had issues with getting
all the replies from lkml.org (the side simply browned-out some
replies and comments to the original, v2 and v3 series. So please
if you have already had a comment on the previous patch that wasn't
implemented in this RFC, let me know.

Thanks! (Please keep me in the CC)
---

Christian Lamparter (1):
  gpio: generic: fix GPIO_GENERIC_PLATFORM is set to module case

Álvaro Fernández Rojas (2):
  gpio: dt-bindings: add basic-mmio-gpio bindings
  gpio: generic: add DT support for basic memory-mapped GPIOs

 .../devicetree/bindings/gpio/basic-mmio-gpio.txt   | 73 ++++++++++++++++++++++
 drivers/gpio/gpio-generic.c                        | 72 ++++++++++++++++++++-
 2 files changed, 142 insertions(+), 3 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/gpio/basic-mmio-gpio.txt

-- 
2.8.1

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