From mboxrd@z Thu Jan  1 00:00:00 1970
From: Denis CIOCCA <denis.ciocca@st.com>
Subject: Re: need help to configure IRQ on gpio 139 pandaboard using device
 tree
Date: Thu, 12 Dec 2013 16:05:54 +0100
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To: Nishanth Menon <nm@ti.com>
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> why is mcspi1 your interrupt parent when you did a padconf for GPIO?
> you want GPIO136, so you need the right gpio block as the interrupt
> parent and map interrupts in the correct map.
> see [1] for an example (omap2).
Oh my god! Now I've understand how device tree works...I'm sorry 
Nishanth but the dt it's new for me...ok I'm using gpio5 and now it works!

+interrupt-parent = <&gpio5>;
+       interrupts = <8 IRQ_TYPE_LEVEL_HIGH>; /* gpio line 136 */

Thank you very much for your patience...;)

BR,
Denis