linux-kernel - Re: [PATCH] gpio: add support for ITE IT87xx Super I/O GPIO.

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Date:	Mon, 19 Mar 2012 17:01:16 +0100
From:	Diego Elio Pettenò <flameeyes@...meeyes.eu>
To:	Guenter Roeck <guenter.roeck@...csson.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Denis Turischev <denis@...pulab.co.il>
Subject: Re: [PATCH] gpio: add support for ITE IT87xx Super I/O GPIO.

Il giorno dom, 18/03/2012 alle 17.54 -0700, Guenter Roeck ha scritto:
> On IT8721F (which is supposedly mostly compatible to IT8728F), only four of the 87 GPIO pins
> are GPIO-only (unless I miscounted ;). All others have at least two different functions.

On the IT8728F the 64 GPIO (11 to 87, they use an X-Y notation) are
divided in eight banks, and only the latest three banks are GPIO-only,
the others all have alternate functions.

> Not sure if it is a good idea to re-configure any of those pins. I would assume
> there is a reason if a given set of pins is configured as UART, for example.

That's true, on the other hand there are a few pins that should be
reused without other issues: for instance the LED ones. That's what I
was thinking of with an MFD SuperIO driver.

At any rate I'll look at the pinctrl subsystem since the gpio_request
function in the gpio driver is indeed changing the mapping like pinmux
should. And there I thought it would have been an easy driver to write
^^;;

-- 
Diego Elio Pettenò — Flameeyes
http://blog.flameeyes.eu/

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