Hi Rafał,
On Mon, Dec 8, 2014 at 3:27 PM, Rafał Miłecki <[email protected]> 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 <[email protected]>
> ---
> .../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 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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