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add bindings document for altera freeze bridge

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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@opensource.altera.com>
Signed-off-by: Matthew Gerlach <mgerlach@opensource.altera.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Alan Tull 2016-10-17 11:09:34 -05:00 committed by Rob Herring
parent 1adcbea420
commit 3c263bc7b7
1 changed files with 23 additions and 0 deletions
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Documentation/devicetree/bindings/fpga/altera-freeze-bridge.txt Normal file
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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"
- 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 {
compatible = "altr,freeze-bridge-controller";
regs = <0x1000 0x10>;
bridge-enable = <0>;
};