PXA 26x GPIO possible regression in kernel 3.3 and newer
Damian Czarnecki
dczarn at o2.pl
Fri Jul 27 11:10:51 EDT 2012
Hello. This is my first post here. I have a problem with GPIOs on my board (HTC
Blue Angel PDA) with kernel versions 3.3 and newer.
This board has PXA 263 CPU, which has 89 GPIOs
and ASIC3 chip with GPIOs 192-255.
The problem is that on kernel 3.3+ I can't access PXA GPIOs at all,
but the ASIC3 works.
Unfortunately, because of that I can't see whole kernel output or post dmesg
here,
because PXA GPIOs are needed for SD Card,USB and many more things.
But I caught a line "gpiochip_add: registered GPIOs 192 to 255 on device: asic3",
so it shows that ASIC3 really is detected and works.
Other errors are "gpio-keys failed to request gpio 0 error -22",
"tmio-mmc: probe of tmio-mmc failed with error -22".
With kernel 3.2 or older everything works. When requesting PXA GPIOs, it fails.
Reading GPIOs hangs the system. I hope that somebody can help me.
I know I haven't shown much info, but this is probably all I can get now.
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