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From: Nandor Han <nandor.han@ge.com>
To: gregkh@linuxfoundation.org, davem@davemloft.net,
	geert@linux-m68k.org, mchehab@kernel.org, daniel.vetter@ffwll.ch,
	linus.walleij@linaro.org, gnurou@gmail.com, robh+dt@kernel.org,
	mark.rutland@arm.com, linux-gpio@vger.kernel.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Nandor Han <nandor.han@ge.com>
Subject: [PATCH v2 0/4] XRA1403,gpio - add XRA1403 gpio expander driver
Date: Thu, 13 Apr 2017 13:27:47 +0300	[thread overview]
Message-ID: <cover.1492077070.git.nandor.han@ge.com> (raw)

The patchset will add a driver to support basic functionality for
XRA1403 device. Features supported:
        - get/set GPIO direction (input, output)
        - get/set GPIO level (low, high)

Documentation: A gpio-xra1403.txt file was added to document the DTS
	bindings related to driver.

Testing:

1.1 XRA1403 connected to iMX53 MCU
1.2 Use the GPIO tools provided by kernel from tools/gpio dir

2.1 `lsgpio`

root@csmon ppd:~# lsgpio
GPIO chip: gpiochip8, "xra1403", 16 GPIO lines
        line  0: unnamed unused [output]
        line  1: unnamed unused [output]
        line  2: unnamed unused [output]
        line  3: unnamed unused [output]
        line  4: unnamed unused [output]
        line  5: unnamed unused
        line  6: unnamed unused
        line  7: unnamed unused [output]
        line  8: unnamed unused [output]
        line  9: unnamed unused
        line 10: unnamed unused [output]
        line 11: unnamed unused
        line 12: unnamed unused
        line 13: unnamed unused
        line 14: unnamed unused
        line 15: unnamed unused [output]
GPIO chip: gpiochip7, "xra1403", 16 GPIO lines
        line  0: unnamed unused
        line  1: unnamed unused
        line  2: unnamed unused
        line  3: unnamed unused
        line  4: unnamed unused
        line  5: unnamed unused
        line  6: unnamed unused
        line  7: unnamed unused
        line  8: unnamed unused
        line  9: unnamed unused
        line 10: unnamed unused
        line 11: unnamed unused
        line 12: unnamed unused
        line 13: unnamed unused
        line 14: unnamed unused
        line 15: unnamed unused

3.1 `gpio-hammer`

root@csmon ppd:~# gpio-hammer -n gpiochip8 -o0 -o1 -o2 -o3
Hammer lines [0, 1, 2, 3] on gpiochip8, initial states: [0, 0, 0, 0]
[\] [0: 0, 1: 0, 2: 0, 3: 0]
...
[\] [0: 1, 1: 1, 2: 1, 3: 1]

When using `gpio-hammer` I also attached an oscilloscope to one of the pins and I was
able to monitor and validate the GPIO status.

Nandor Han (4):
  dt-bindings: gpio - add exar to vendor prefixes list
  gpio - Add EXAR XRA1403 SPI GPIO expander driver
  doc,dts - add XRA1403 DTS binding documentation
  Add XRA1403 support to MAINTAINERS file

 .../devicetree/bindings/gpio/gpio-xra1403.txt      |  46 ++++
 .../devicetree/bindings/vendor-prefixes.txt        |   1 +
 MAINTAINERS                                        |   8 +
 drivers/gpio/Kconfig                               |   5 +
 drivers/gpio/Makefile                              |   1 +
 drivers/gpio/gpio-xra1403.c                        | 236 +++++++++++++++++++++
 6 files changed, 297 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/gpio-xra1403.txt
 create mode 100644 drivers/gpio/gpio-xra1403.c

-- 
2.10.1

             reply	other threads:[~2017-04-13 10:28 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-13 10:27 Nandor Han [this message]
2017-04-13 10:27 ` [PATCH v2 1/4] dt-bindings: gpio - add exar to vendor prefixes list Nandor Han
2017-04-19 21:48   ` Rob Herring
2017-04-24 13:19   ` Linus Walleij
2017-04-13 10:27 ` [PATCH v2 2/4] gpio - Add EXAR XRA1403 SPI GPIO expander driver Nandor Han
2017-04-13 16:22   ` kbuild test robot
2017-04-24 13:47   ` Linus Walleij
2017-04-24 13:53     ` Han, Nandor (GE Healthcare)
2017-04-25  7:07     ` Benjamin Henrion
2017-04-25  7:15       ` Geert Uytterhoeven
2017-04-26 17:50         ` Andy Shevchenko
2017-04-26 14:42       ` Linus Walleij
2017-04-13 10:27 ` [PATCH v2 3/4] doc,dts - add XRA1403 DTS binding documentation Nandor Han
2017-04-19 21:55   ` Rob Herring
2017-04-24 13:49   ` Linus Walleij
2017-04-13 10:27 ` [PATCH v2 4/4] Add XRA1403 support to MAINTAINERS file Nandor Han

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