linux-kernel - Re: [RFC 0/3] Adding support for NI Ettus Research USRP E3XX pinconf

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Date:	Tue, 17 Nov 2015 11:55:37 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Moritz Fischer <moritz.fischer@...us.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Paweł Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [RFC 0/3] Adding support for NI Ettus Research USRP E3XX pinconf

On Fri, Nov 6, 2015 at 12:41 AM, Moritz Fischer
<moritz.fischer@...us.com> wrote:

> I'm planning to use this pinctrl driver to set pins to either
> input (do nothing, default), or output with a value of (1 or 0).
>
> Can I use the 'output-low', 'output-high' bindings to achieve this,
> or am I supposed to implement a gpio controller to do this kind of stuff?

I'm pretty sure you should implement a GPIO chip for this.
output-low and output-high are for things like lines going to
a RAM memory that need to be set up as part of a pin control
state.

> I'm not sure if I'm using the pinctrl framework correctly to achieve this,
> any suggestions on how to change a pin from output to input, as the bindings
> documentation explicitly states 'input-enable' does *not* affect output.

Look at pin controllers also implementing GPIO chips.

Yours,
Linus Walleij
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