On Sat, 8 Oct 2016, Rob Herring wrote:
> On Wed, Sep 28, 2016 at 01:21:51PM -0500, Alan Tull wrote:
> > Add bindings document for the Altera Freeze Bridge. A Freeze
> > Bridge is used to gate traffic to/from a region of a FPGA
> > such that that region can be reprogrammed. The Freeze Bridge
> > exist in FPGA fabric that is not currently being reconfigured.
> >
> > Signed-off-by: Alan Tull <atull@xxxxxxxxxxxxxxxxxxxxx>
> > Signed-off-by: Matthew Gerlach <mgerlach@xxxxxxxxxxxxxxxxxxxxx>
> > ---
> > v19: Added in v19 of patchset, uses fpga image info struct
> > ---
> > .../bindings/fpga/altera-freeze-bridge.txt | 23 ++++++++++++++++++++++
> > 1 file changed, 23 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/fpga/altera-freeze-bridge.txt
> >
> > diff --git a/Documentation/devicetree/bindings/fpga/altera-freeze-bridge.txt b/Documentation/devicetree/bindings/fpga/altera-freeze-bridge.txt
> > new file mode 100644
> > index 0000000..97ecc11
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/fpga/altera-freeze-bridge.txt
> > @@ -0,0 +1,23 @@
> > +Altera Freeze Bridge Controller Driver
> > +
> > +The Altera Freeze Bridge Controller manages one or more freeze bridges.
> > +The controller can freeze/disable the bridges which prevents signal
> > +changes from passing through the bridge. The controller can also
> > +unfreeze/enable the bridges which allows traffic to pass through the
> > +bridge normally.
> > +
> > +Required properties:
> > +- compatible : Should contain "altr,freeze-bridge-controller"
>
> Only one version of the h/w?
The h/w has a version register. Currently the driver reads
the reg and exits if rev != 2. Future version support can be
keyed off this register.
>
> > +- regs : base address and size for freeze bridge module
> > +
> > +Optional properties:
> > +- bridge-enable : 0 if driver should disable bridge at startup
> > + 1 if driver should enable bridge at startup
> > + Default is to leave bridge in current state.
> > +
> > +Example:
> > + freeze_controller@100000450 {
>
> Underscore...
Yes.
>
> > + compatible = "altr,freeze-bridge-controller";
> > + regs = <0x1000 0x10>;
> > + bridge-enable = <0>;
> > + };
> > --
> > 2.9.3
> >
> > --
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