linux-kernel - Re: [PATCH v8 0/3] gpio: add DT support for memory-mapped GPIOs

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Message-ID: <CAHp75VdrbagU496qLjoUWMb7pWS3VyM4PDYwmyZFw52RgPs9=g@mail.gmail.com>
Date:	Sun, 8 May 2016 16:19:34 +0300
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Christian Lamparter <chunkeey@...glemail.com>
Cc:	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	devicetree <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
	Álvaro Fernández Rojas <noltari@...il.com>,
	Kumar Gala <galak@...eaurora.org>,
	Alexander Shiyan <shc_work@...l.ru>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v8 0/3] gpio: add DT support for memory-mapped GPIOs

On Sun, May 8, 2016 at 4:08 PM, Christian Lamparter
<chunkeey@...glemail.com> wrote:
> This patch series adds device tree support for generic memory-mapped GPIOs.
> The GPIO library already allows drivers and architecture support code to
> reuse generic code for managing 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). His generic approach patch allowed
> me to easily get the GPIO (and the connected LEDs, buttons, gpiohogs)
> up and running. Even thought, Mr. Fernandez initially developed it
> for his work on the brcm63xx [2].
>
> The third patch (which can be applied at a later time) moves gpio-clps711x,
> gpio-ge, gpio-moxart and gpio-ts4800 into gpio-mmio.c. The old driver files
> and makefile entries have been removed. The Kconfig entries for these
> drivers are kept for compatibility reasons.
>
> And finally, the most important stat about the series:
>         >>> 336 insertions(+), 380 deletions(-) <<<
>         It still removes more lines than it adds!
>
> Thanks!
>
> [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>
>

FWIW:
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>


> changelog:
>
> v7 -> v8:
>         - removed ngpio property parser and most flags parsers
>         - converted clps711x to switch case for GPIO
>         - retained original Kconfig syms which now select GPIO_GENERIC_PLATFORM
>
> v6 -> v7:
>         - finally made a PATCH series (based on linux-gpio devel branch)
>         - added Rob Herring's ACK to the dt bindings
>         - cc'd clps711x, gpio-ge, moxart and ts4800 authors for driver
>           changes.
>
> v5 -> v6:
>         - rewrote bindings and driver patch to fit the wd,mbl-gpio
>         - unified parser code for gpio-ge, gpio-moxart and gpio-ts4800
>         - fixed gpio chip's base being overwritten with bogus "0"
>         - fixed compat driver crash when reload gpio-generic.ko module
>         - dropped already applied patches from the series
>         - rebased code on linus' devel tree
>         - moved dt bindings patch to the top of the series
>
> v4 -> v5:
>         - reverted rename of gpio-mmio.c back to gpio-generic.c
>         - fixed Andy Shevchenko's comments
>         - consolidated changes from clps711x, gpio-ge, gpio-moxart and
>           gpio-ts4800 into one patch.
>
> v3 -> v4:
>         - renamed gpio-generic.c to gpio-mmio.c
>         - changed compat. string to "linux,gpio-mmio"
>         - integrated Cirrus clps711x driver
>         - integrated GE FGPA gpio-ge driver
>         - integrated MOXA ART GPIO driver
>         - integrated TS4800 gpio driver
>         - reshuffled patches, reworded commits, fixed spelling errors, etc.
>
> Christian Lamparter (2):
>   gpio: dt-bindings: add wd,mbl-gpio bindings
>   gpio: move clps711x, moxart, ts4800 and gpio-ge into gpio-mmio
>
> Álvaro Fernández Rojas (1):
>   gpio: mmio: add DT support for memory-mapped GPIOs
>
>  .../devicetree/bindings/gpio/wd,mbl-gpio.txt       |  38 +++
>  drivers/gpio/Kconfig                               |  16 +-
>  drivers/gpio/Makefile                              |   4 -
>  drivers/gpio/gpio-clps711x.c                       |  91 -------
>  drivers/gpio/gpio-ge.c                             | 114 --------
>  drivers/gpio/gpio-mmio.c                           | 288 ++++++++++++++++++++-
>  drivers/gpio/gpio-moxart.c                         |  84 ------
>  drivers/gpio/gpio-ts4800.c                         |  81 ------
>  8 files changed, 336 insertions(+), 380 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/gpio/wd,mbl-gpio.txt
>  delete mode 100644 drivers/gpio/gpio-clps711x.c
>  delete mode 100644 drivers/gpio/gpio-ge.c
>  delete mode 100644 drivers/gpio/gpio-moxart.c
>  delete mode 100644 drivers/gpio/gpio-ts4800.c
>
> --
> 2.8.1
>



-- 
With Best Regards,
Andy Shevchenko