From: J.Lambrecht@televic.com (Jürgen Lambrecht)
To: kernelnewbies@lists.kernelnewbies.org
Subject: linux gpio
Date: Tue, 29 Mar 2011 10:06:58 +0200 [thread overview]
Message-ID: <4D919322.9060003@televic.com> (raw)
Hello,
I am new to linux (coming from eCos).
My backlight driver does not start up because the reset gpio pin is not
correct specified.
How does gpio work in Linux?
I have 2 platforms that use the same backlight driver, under arm, for freescale imx: imx31_3ds and imx27_3ds.
I don't think that matters, I just need to understand the linux gpio.
The imx31 platform gives the number 88 as gpio number to the backlight
driver.
That number comes out of 'iomux-mx3.h'.
In 'iomux-mx27.h' the GPIO's are specified in an other way, the
"hardware" way, specifying bank and port. I think Linux GPIO needs a
sort of general gpio number.
But how do I calculate that number out of the datasheet?
In the imx31 datasheet, I cannot find that number 88 (or the other
numbers in 'iomux-mx3.h').
Kind regards,
J?rgen
--
J?rgen Lambrecht
R&D Associate
Tel: +32 (0)51 303045 Fax: +32 (0)51 310670
http://www.televic-rail.com
Televic Rail NV - Leo Bekaertlaan 1 - 8870 Izegem - Belgium
Company number 0825.539.581 - RPR Kortrijk
next reply other threads:[~2011-03-29 8:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-29 8:06 Jürgen Lambrecht [this message]
2011-04-03 7:36 ` linux gpio Jim Cromie
2011-04-04 11:44 ` Jürgen Lambrecht
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