Re: [PATCH] gpio: Add driver for MEN 16Z127 GPIO controller
From: Linus Walleij
Date: Fri Oct 16 2015 - 15:51:49 EST
On Thu, Oct 8, 2015 at 6:55 PM, Andreas Werner <andy@xxxxxxxxxxxxx> wrote:
> The register is currently impelemented as a read/write register
> which means the pin mode is configurable by software to
> Push Pull or Open Drain.
OK then you can set it in accordance to what clients request.
> There is also the possiblity (normal way) that the HW (FPGA) configures
> each pin to the correct mode.
>
> Is there actually a way to set an output mode from userland or by the gpio API?
As per <linux/gpio/machine.h> you can specify per-line if it should be
open drain using GPIO_OPEN_DRAIN, this will push through to the
gpio descriptor and those lines with this flag set will be handled specially.
We have merged device tree bindings for OD/OS but not code to
handle these, but I might have some code from Laurent Pinchart cooking
for the DT in-kernel backend too.
> I did not find anything about that.
git grep OPEN_DRAIN
Yours,
Linus Walleij
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