linux-kernel - Re: [RFC PATCH] gpio: add GPIO hogging mechanism

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Message-ID: <CACRpkdYq11_fSWMzb+CCgWzjeUq2TeSja7h0UrbxB2_-yPYG9w@mail.gmail.com>
Date:	Wed, 8 Jan 2014 10:45:18 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	boris brezillon <b.brezillon@...rkiz.com>
Cc:	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Landley <rob@...dley.net>,
	Alexandre Courbot <gnurou@...il.com>,
	Jiri Prchal <jiri.prchal@...ignal.cz>,
	Ben Gamari <bgamari.foss@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Pekon Gupta <pekon@...com>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>
Subject: Re: [RFC PATCH] gpio: add GPIO hogging mechanism

On Mon, Dec 30, 2013 at 10:48 AM, boris brezillon
<b.brezillon@...rkiz.com> wrote:
> On 19/12/2013 19:22, Felipe Balbi wrote:

>> that's quite a weird argument from Linus W, considering you _do_ have a
>> discrete mux on the board.
>
>> We have quite a few of such "crazy" scenarios here at TI and we were
>> going to send a pinctrl-gpio driver.

Hm I'm all in the blue as to what a "pinctrl-gpio driver" is ... I'm
confused :-)

>> If that's not acceptable, then I
>> suppose there is no way to boot from NAND on a board where NAND signals
>> go through a discrete mux where the select signal is a GPIO pin.

One problem I have is that I still don't really understand if this is a pin
mux, i.e. changing the connection to a certain device onto some actual
*PIN* or just some other mux muxing some certain line from one silicon
block to another.

> Linus, tell me if I'm wrong, but I think, the pinctrl-gpio is the right way
> to solve
> the at91rm9200ek board use case.

I don't know, because I don't know exactly what you mean by
"pinctrl-gpio".

Yours,
Linus Walleij
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