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Re: [PATCH linux v1 0/4] Seven segment display support

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Hello,

On Tue, 13 Dec 2016 23:55:00 -0800, Jaghathiswari Rankappagounder
Natarajan wrote:

> Documentation for the binding which provides an interface for adding clock,
> data and clear signal GPIO lines to control seven segment display.
> 
> The platform device driver provides an API for displaying on two 7-segment
> displays, and implements the required bit-banging. The hardware assumed is
> 74HC164 wired to two 7-segment displays.
> 
> The character device driver implements the user-space API for letting a user
> write to two 7-segment displays including any conversion methods necessary
> to map the user input to two 7-segment displays.
> 
> Adding clock, data and clear signal GPIO lines in the devicetree to control
> seven segment display on zaius platform.
> 
> The platform driver matches on the device tree node; the platform driver also
> initializes the character device.
> 
> Tested that the seven segment display works properly by writing to the
> character device file on a EVB AST2500 board which also has 74HC164 wired
> to two 7-segment displays.

FWIW, I proposed a driver for seven segment displays back in 2013:

   http://lists.infradead.org/pipermail/linux-arm-kernel/2013-January/139986.html

And the feedback from Greg KH was: we don't need a driver for that, do
it from userspace. See:

   http://lists.infradead.org/pipermail/linux-arm-kernel/2013-January/139992.html

So: good luck :-)

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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[PATCH linux v1 0/4] Seven segment display support Jaghathiswari Rankappagounder Natarajan <jaghu@google.com> - 2016-12-14 09:00 +0100
  [PATCH linux v1 4/4] arm: dts: Add dt-binding to support seven segment display on zaius Jaghathiswari Rankappagounder Natarajan <jaghu@google.com> - 2016-12-14 09:00 +0100
    Re: [PATCH linux v1 4/4] arm: dts: Add dt-binding to support seven segment display on zaius Arnd Bergmann <arnd@arndb.de> - 2016-12-14 10:00 +0100
      Re: [PATCH linux v1 4/4] arm: dts: Add dt-binding to support seven segment display on zaius Arnd Bergmann <arnd@arndb.de> - 2016-12-14 10:10 +0100
        Re: [PATCH linux v1 4/4] arm: dts: Add dt-binding to support seven  segment display on zaius Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-12-14 12:10 +0100
          Re: [PATCH linux v1 4/4] arm: dts: Add dt-binding to support seven  segment display on zaius Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-12-14 12:50 +0100
            Re: [PATCH linux v1 4/4] arm: dts: Add dt-binding to support seven  segment display on zaius Linus Walleij <linus.walleij@linaro.org> - 2016-12-16 00:10 +0100
    Re: [PATCH linux v1 4/4] arm: dts: Add dt-binding to support seven  segment display on zaius Joel Stanley <joel@jms.id.au> - 2016-12-14 10:10 +0100
  [PATCH linux v1 2/4] drivers: misc: Character device driver for seven segment display Jaghathiswari Rankappagounder Natarajan <jaghu@google.com> - 2016-12-14 09:00 +0100
    Re: [PATCH linux v1 2/4] drivers: misc: Character device driver for  seven segment display Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-12-14 13:40 +0100
  [PATCH linux v1 3/4] drivers: misc: Platform driver for seven segment display support Jaghathiswari Rankappagounder Natarajan <jaghu@google.com> - 2016-12-14 09:00 +0100
  [PATCH linux v1 1/4] Documentation: dt-bindings: Document bindings for seven segment display support Jaghathiswari Rankappagounder Natarajan <jaghu@google.com> - 2016-12-14 09:00 +0100
  Re: [PATCH linux v1 0/4] Seven segment display support Thomas Petazzoni <thomas.petazzoni@free-electrons.com> - 2016-12-14 13:50 +0100
    Re: [PATCH linux v1 0/4] Seven segment display support Greg KH <gregkh@linuxfoundation.org> - 2016-12-14 14:00 +0100
      Re: [PATCH linux v1 0/4] Seven segment display support Neil Armstrong <narmstrong@baylibre.com> - 2016-12-14 14:20 +0100
        Re: [PATCH linux v1 0/4] Seven segment display support Arnd Bergmann <arnd@arndb.de> - 2016-12-14 15:20 +0100
          Re: [PATCH linux v1 0/4] Seven segment display support David Daney <ddaney.cavm@gmail.com> - 2016-12-14 22:20 +0100
        Re: [PATCH linux v1 0/4] Seven segment display support Greg KH <gregkh@linuxfoundation.org> - 2016-12-14 18:00 +0100

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