Messages in this thread | | | Subject | Re: [PATCH] gpio: add support for ITE IT87xx Super I/O GPIO. | From | Diego Elio Pettenò <> | Date | Mon, 19 Mar 2012 17:01:16 +0100 |
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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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