Hi Laurent,

On Mon, Nov 14, 2016 at 2:41 PM, Laurent Pinchart
<laurent.pinch...@ideasonboard.com> wrote:
> On Monday 14 Nov 2016 14:35:26 Geert Uytterhoeven wrote:
>> The main reason I haven't sent out a similar series yet is because the GPIOs
>> used for the 3 push buttons are shared with the 3 user LEDs. For each of
>> them, you have to choose at DT time if you want to use them as buttons or
>> as LEDs.
>>
>> On ULCB, the same issue is present. For those, we settled on 1 key and 2
>> LEDs...
>>
>> Looking forward to more comments...
>
> In theory the GPIOs could be shared by the gpio-keys and LED drivers in open-
> drain mode. I'm not sure the GPIO subsystem supports that though.

Been there, done that, cfr. "[RFD] Sharing GPIOs for input (buttons) and
output (LEDs)". The result wasn't pretty...

Gr{oetje,eeting}s,

                        Geert

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

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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