Re: [PATCH] gpio: 74x164: add dt support for nxp's 74x594

[Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>]

On Tue, Mar 15, 2016 at 12:32 AM, Nicolas Saenz Julienne
<nicolassaenzj@xxxxxxxxx> wrote:
> The chip is also an 8 bit shift register which works out of the box as a GPO
> expander with this patch
>
> Signed-off-by: Nicolas Saenz Julienne <nicolassaenzj@xxxxxxxxx>
> ---
>  Documentation/devicetree/bindings/gpio/gpio-74x164.txt | 4 +++-
>  drivers/gpio/gpio-74x164.c                             | 1 +
>  2 files changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-74x164.txt b/Documentation/devicetree/bindings/gpio/gpio-74x164.txt
> index cc26080..ce1b223 100644
> --- a/Documentation/devicetree/bindings/gpio/gpio-74x164.txt
> +++ b/Documentation/devicetree/bindings/gpio/gpio-74x164.txt
> @@ -1,7 +1,9 @@
>  * Generic 8-bits shift register GPIO driver
>
>  Required properties:
> -- compatible : Should be "fairchild,74hc595"
> +- compatible: Should contain one of the following:
> +    "fairchild,74hc595"
> +    "nxp,74lvc594"

Why did you choose the "lvc" variant?

Ideally, you want to put the oldest "manuf,74x594" variant here.
I once read it was Motorola who invented the 7459x parts, to interface with
SPI.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

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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