linux-kernel - Re: [V3,3/7] ARM: dts: Add gpio-button entries for Arndale board

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Date:	Tue, 17 Sep 2013 16:13:46 +0530
From:	MJ embd <mj.embd@...il.com>
To:	linaro-kernel <linaro-kernel@...ts.linaro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	Tushar Behera <tushar.behera@...aro.org>,
	Sachin Kamat <sachin.kamat@...aro.org>
Subject: Re: [V3,3/7] ARM: dts: Add gpio-button entries for Arndale board

PS:Adding linux kernel for a larger forum comments

Hi Linaro,

I am trying to attach interrupt handlers to the push buttons on the
arndale board.
Your patch adds in dts information on the push buttons

menu {
+                       label = "SW-TACT2";
+                       gpios = <&gpx1 4 1>;
+                       linux,code = <139>;
+                       gpio-key,wakeup;
+               };

I assume that <139> is the GPU number in base 10. Is this correct ?
Also what is the significance of gpx1 and 4 1 ?

As per my understanding if 139 the GPIO number then it should be
mapped to a GPIO register where the state Input/ouput/Interrupt has to
be set.

I am not able to find that register in the
"Exynos_5_Dual_User_Manaul_Public_REV100-0", All I could find a set of
GPXXXX registers but no mapping between <139> and those registers.

Can anyone explain the steps, on how to associate the push button to INT (IRQ)

Thanks in Advance..
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