Re: [PATCH] gpio: sn54hc595: new driver for GPIO shift registers chipsets

[Geert Uytterhoeven <geert@linux-m68k.org>]

Hi Rafał,

On Mon, Dec 8, 2014 at 3:27 PM, Rafał Miłecki <zajec5@gmail.com> wrote:
> SN54HC595 and SN74HC595 are devices based on shift registers controlled
> with 5 input signals (serial-in) and providing 8 outputs (parallel-out).
>
> They are present on some Broadcom home router boards where manufacturer
> needed few extra GPIOs.
>
> This driver simply uses specified GPIOs to control shift registers and
> registers another GPIO chip. So you can call it a GPIO extender.
>
> Due to the hardware design only output direction is supported. Reading
> values is handled using tiny internal cache.
>
> Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
> ---
>  .../devicetree/bindings/gpio/gpio-sn54hc595.txt    |  35 ++++
>  drivers/gpio/Kconfig                               |  11 ++
>  drivers/gpio/Makefile                              |   1 +
>  drivers/gpio/gpio-sn54hc595.c                      | 219 +++++++++++++++++++++

The '595 is already handled by drivers/gpio/gpio-74x164.c.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

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when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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