Re: [PATCH v2 1/2] fsl: Add binding for RCPM

[Scott Wood <scottwood@freescale.com>]

On Tue, 2015-09-15 at 21:15 -0500, Wang Dongsheng-B40534 wrote:
> Hi Scott,
> 
> > -----Original Message-----
> > From: Wood Scott-B07421
> > Sent: Wednesday, September 16, 2015 7:57 AM
> > To: Wang Dongsheng-B40534
> > Cc: devicetree@vger.kernel.org; linuxppc-dev@lists.ozlabs.org;
> > robh+dt@kernel.org; linux-arm-kernel@lists.infradead.org; Wang Huan-
> > B18965; Jin
> > Zhengxiong-R64188; Zhao Chenhui-B35336; Tang Yuantian-B29983
> > Subject: Re: [PATCH v2 1/2] fsl: Add binding for RCPM
> > 
> > On Tue, 2015-09-15 at 16:55 +0800, Dongsheng Wang wrote:
> > > +* Freescale RCPM Wakeup Source Device Tree Bindings
> > > +-------------------------------------------
> > > +Required rcpm-wakeup property should be added to a device node if the
> > > device
> > > +can be used as a wakeup source.
> > > +
> > > +  - rcpm-wakeup: The value of the property consists of 3 cells. The 
> > > first
> > > cell
> > > +     is a pointer to the rcpm node, the second cell is the bit mask 
> > > that
> > > +     should be set in IPPDEXPCR0, and the last cell is for IPPDEXPCR1.
> > > +     Note: If the platform has no IPPDEXPCR1 register, put a zero here.
> > 
> > What if a future platform has more than two of these registers?
> 
> Those registers are only used for wakeup device, we have a lot of available 
> bit
> for feature. For example, In LS1021a platform only 7bits has used in the 
> registers,
> and 57bits is reserved.

Still, it'd be better to for the rcpm node to advertise the number of cells 
it expects.

-Scott