Re: dec behavior question

[Kumar Gala <galak-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>]

On Oct 25, 2011, at 7:18 AM, Yoder Stuart-B08248 wrote:

> 
> 
>> -----Original Message-----
>> From: devicetree-discuss-bounces+stuart.yoder=freescale.com-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org
>> [mailto:devicetree-discuss-bounces+stuart.yoder=freescale.com-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org] On Behalf Of
>> David Gibson
>> Sent: Monday, October 24, 2011 6:15 PM
>> To: Kumar Gala
>> Cc: devicetree-discuss
>> Subject: Re: dec behavior question
>> 
>> On Mon, Oct 24, 2011 at 09:01:49AM -0500, Kumar Gala wrote:
>>> If I have something like:
>>> 
>>> ---------------------------------------
>>> spi.dtsi:
>>> 
>>> &spi0 {
>>>        #address-cells = <1>;
>>>        #size-cells = <0>;
>>>        compatible = "fsl,mpc8536-espi";
>>>        reg = <0x7000 0x1000>;
>>>        interrupts = <59 0x2 0 0>;
>>> };
>>> ---------------------------------------
>>> 
>>> foo.dts:
>>> 
>>> spi0: spi@f00bar {
>>> 	compatible = "FOOBAR";
>>> };
>>> 
>>> /include/ "spi.dtsi"
>>> 
>>> ---------------------------------------
>>> 
>>> What do you expect the resulting dtb to look like w/regards to the
>>> compatible node?
>> 
>> It's always last tree wins.  So it will end up with compatible = "FOOBAR".
> 
> If last wins, then it would be the included file
> (compatible = "fsl,mpc8536-espi"), no?
> 
> Stuart

I don't believe so because the include of spi.dtsi doesn't actually instantiate a node.  This is a little different than use of 'include' for merging of nodes.

- k