Passing GPIO irq edge/level flags from devicetree to driver, how?

[shawn.guo@linaro.org (Shawn Guo)]

Hi Sascha,

Try to change the value of #interrupt-cells under gpio node from 1 to 2.

I forgot updating imx on this.

Regards,
Shawn

On Fri, Jul 06, 2012 at 09:54:34AM +0200, Sascha Hauer wrote:
> Hi All,
> 
> Several gpio binding documents like the one for mxs have the following
> in them:
> 
> - #interrupt-cells : Should be 2.  The first cell is the GPIO number.
>   The second cell bits[3:0] is used to specify trigger type and level flags:
>       1 = low-to-high edge triggered.
>       2 = high-to-low edge triggered.
>       4 = active high level-sensitive.
>       8 = active low level-sensitive.
> 
> Does anybody know where this information is evaluated and how this is
> passed to the driver?
> 
> I am working on i.MX (who would have guessed that) and I am trying to
> connect a I2C device with an interrupt source connected to the gpio
> interrupt controller. It works fine, only the irq level/edge flags
> get lost somewhere.
> 
> What I have is:
> 
> 	maxtouch at 4b {
> 		compatible = "mXT224";
> 		reg = <0x4b>;
> 		interrupt-parent = <&gpio7>;
> 		interrupts = <13 2>;
> 	};
> 
> Any idea how the maxtouch driver can use the 'high-to-low edge
> triggered' information?
> 
> BTW. the i.MX GPIO binding document does not claim to support the flags,
> but I assume it's just missing in the document, but there maybe also
> something missing in the driver to support this.
> 
> Sascha
> 
> -- 
> Pengutronix e.K.                           |                             |
> Industrial Linux Solutions                 | http://www.pengutronix.de/  |
> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |