* Using gpiolib to power off my system
@ 2008-11-12 10:51 Juergen Beisert
0 siblings, 0 replies; only message in thread
From: Juergen Beisert @ 2008-11-12 10:51 UTC (permalink / raw)
To: linuxppc-dev
Hi list,
I want to use the gpiolib API in a routine that should poweroff the system=
=20
(MPC5200B). I register my poweroff routine in the define_machine() macro as:
[...]
=2Epower_off =3D my_power_off,
[...]
In this routine I'm using gpio_request(...), gpio_direction_output(...) and=
=20
gpio_set_value(...) ---- but nothing happens.
When I set the GPIOs in the hard way (ioremap() + playing with the register=
s)=20
the system switches off as expected.
How to get some useful debug output at this late system state (printk does =
not=20
work anymore)?
Regards,
Juergen
=2D-=20
Dipl.-Ing. Juergen Beisert | http://www.pengutronix.de
=A0Pengutronix - Linux Solutions for Science and Industry
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2008-11-12 10:51 Using gpiolib to power off my system Juergen Beisert
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