<br><br><div class="gmail_quote">2010/8/11 Daniel Mack <span dir="ltr"><<a href="mailto:daniel@caiaq.de">daniel@caiaq.de</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
You dropped all recipients again and only replied to me.<br>
PLEASE DON'T DO THAT.<br>
Always keep all people in the loop, always.<br>
<div class="im"><br>
On Wed, Aug 11, 2010 at 01:50:43PM +0400, Yuri Ludkevich wrote:<br>
> 2010/8/11 Daniel Mack <<a href="mailto:daniel@caiaq.de">daniel@caiaq.de</a>><br>
</div><div class="im">> > According to my reverse engineering, this should be GPIO4_2.<br>
> ><br>
><br>
> Thanks a lot.<br>
><br>
> BTW: does /sys/class/gpio/export support GPIOX_2 pins?<br>
<br>
</div>Yes, they are aliases to the signals without the "_2" suffix. Quoting<br>
the PXA reference manual, chapter 5.3:<br>
<br>
GPIO<6_0>_2:<br>
<br>
General-Purpose IO Ports, second instantiation. The same signals as<br>
GPIO<6:0>, but they are given separate names because they are configured<br>
on separate multi-function pins. The recommended configuration is for<br>
both multi-function pin instantiations of these GPIOs not to be<br>
configured simultaneously for GPIO functionality. The preferred<br>
configuration for dual instantiation GPIO usage (that is, using both<br>
GPIO<6:0> and GPIO<6:0>_2 functions) is to configure one multi-function<br>
pin as a GPIO and the second multi-function pin instantiation for an<br>
alternate function other than a GPIO function. Configuring GPIO<6:0> to<br>
be present on two separate multi-function pins is not recommended.<br>
However, when GPIO<6:0> is configured as an output and both<br>
multi-function pin instantiations are programmed for GPIO function, the<br>
primary and secondary instantiation of the multi-function pins are both<br>
outputs from the common GGPIO<6:0> signal. However, when GPIO<6:0> is an<br>
input, the inputs from both multi-function pin instantiations are ORed<br>
together before the result is sent to the internal GPIO<6:0> input<br>
logic.<br>
<br>
<br>
HTH,<br>
<font color="#888888">Daniel<br>
<br>
</font></blockquote></div>Sorry about other recipients. <br><div class="gmail_quote"><div><br>Hmmm. I found with pxaregs tool what both GPIO4 and GPIO4_2 configured as GPIO. May be this cause irq autodetection to fail?<br>
<br></div></div><br><br>