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Date: Tue, 17 Feb 2009 11:14:51 -0600
From: Scott Wood <scottwood@freescale.com>
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To: Vijay Nikam <vijay.t.nikam@gmail.com>
Subject: Re: Regarding irq_of_parse_and_map
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Vijay Nikam wrote:
> I added the gpio node as follows to mpc8313erdb.dts;
> 
> gpio@c00 {
> 	linux,phandle = <c00>;

Don't specify this explicitly.  Please base new development off of the 
device tree that is in upstream Linux, not the very old tree in your BSP.

> 	device_type = "gpio";

No device_type.

> The only thing I need to know what should I write at 'compatible' tag
> ? ? ? the compatible tag format is "manufacturer,model" the
> manufacturer is 'fsl' i.e. I think freescale but the model, as it is
> the model number where I can find this model ? ? ? Please let me know
> ... thanks ...

compatible = "fsl,mpc8313-gpio", "fsl,mpc8349-gpio";

> Also I would like to ask if the above device node is written according
> to bindings ... I think it should be right as I referred
> 'bootingwithout-of.txt' ... but please correct me if I am worng ? ? ?

See also Documentation/powerpc/dts-bindings/fsl/8xxx_gpio.txt.

Also note that current Linux has a driver in 
arch/powerpc/sysdev/mpc8xxx_gpio.c.

-Scott