[PATCH v2 2/2] powerpc/mpic: add global timer support

[Wang Dongsheng-B40534]

> -----Original Message-----
> From: Wood Scott-B07421
> Sent: Tuesday, August 14, 2012 1:37 AM
> To: Wang Dongsheng-B40534
> Cc: Wood Scott-B07421; benh at kernel.crashing.org; paulus at samba.org;
> linuxppc-dev at lists.ozlabs.org; Gala Kumar-B11780; Li Yang-R58472
> Subject: Re: [PATCH v2 2/2] powerpc/mpic: add global timer support
> 
> On 08/13/2012 01:18 AM, Wang Dongsheng-B40534 wrote:
> >>> +	p = of_get_property(np, "available-ranges", &len);
> >>> +	if (p && len % (2 * sizeof(u32)) != 0) {
> >>> +		pr_err("%s: malformed fsl,available-ranges property.\n",
> >>> +				np->full_name);
> >>> +		return -EINVAL;
> >>> +	}
> >>
> >> You need to support fsl,available-ranges since that's in an accepted
> >> binding and people could have partitioned setups already using it.
> >>
> > [Wang Dongsheng] FSL chip or OPEN-PIC specification(Only a group) in
> > each group only four timer. This is unified. So i use a generic name.
> > I think there is not compatible with existing mpic timer nodes.
> 
> We need to be compatible with existing trees, so you'd need to check for
> both -- but I think any further discussion of the details is premature
> until we decide whether this is worthwhile to begin with (both the
> support of non-FSL timers, and the creation of a new device tree binding
> which will not be implemented by many of the machines that have non-FSL
> openpic because they run real Open Firmware).
> 
[Wang Dongsheng] 
	p = of_get_property(np, "available-ranges", &len);
	if (!p)
		p = of_get_property(np, "fsl,available-ranges", &len);
	
	this code be compatible with existing trees.
	
> -Scott