Hi Lee,
On Wed, 17 Sep 2014 09:34:05 -0700
Lee Jones <lee.jones@xxxxxxxxxx> wrote:
> On Thu, 11 Sep 2014, Boris BREZILLON wrote:
>
> > The GPBR block provides a set of battery-backed registers that can be used
> > to save data which need to be kept when the system is powered down and
> > VDD-core is maintained by an external battery.
> >
> > A typical usage is the RTT block (when used as an RTC) which needs one of
> > those registers to save the current time.
> >
> > Signed-off-by: Boris BREZILLON <boris.brezillon@xxxxxxxxxxxxxxxxxx>
> > ---
> > Documentation/devicetree/bindings/mfd/atmel,gpbr.txt | 15 +++++++++++++++
> > 1 file changed, 15 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/mfd/atmel,gpbr.txt
> >
> > diff --git a/Documentation/devicetree/bindings/mfd/atmel,gpbr.txt b/Documentation/devicetree/bindings/mfd/atmel,gpbr.txt
> > new file mode 100644
> > index 0000000..a285695
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mfd/atmel,gpbr.txt
> > @@ -0,0 +1,15 @@
> > +* Device tree bindings for Atmel GPBR (General Purpose Backup Registers)
> > +
> > +The GPBR are a set of battery-backed registers.
> > +
> > +Required properties:
> > +- compatible: "atmel,at91sam9260-gpbr", "syscon"
> > +- reg: contains offset/length value of the GPBR memory
> > + region.
> > +
> > +Example:
> > +
> > +gpbr: gpbr@fffffd50 {
>
> Is something referencing this node via phandle? If not, please remove
> the label.
Yes, the rtt device is referencing it in its atmel,rtt-rtc-time-reg
property (see patch 8 of this series).
Best Regards,
Boris
--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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