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-rw-r--r--Documentation/devicetree/bindings/rng/timeriomem_rng.txt7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/rng/timeriomem_rng.txt b/Documentation/devicetree/bindings/rng/timeriomem_rng.txt
index 6616d15866a3..214940093b55 100644
--- a/Documentation/devicetree/bindings/rng/timeriomem_rng.txt
+++ b/Documentation/devicetree/bindings/rng/timeriomem_rng.txt
@@ -5,6 +5,13 @@ Required properties:
- reg : base address to sample from
- period : wait time in microseconds to use between samples
+Optional properties:
+- quality : estimated number of bits of true entropy per 1024 bits read from the
+ rng. Defaults to zero which causes the kernel's default quality to
+ be used instead. Note that the default quality is usually zero
+ which disables using this rng to automatically fill the kernel's
+ entropy pool.
+
N.B. currently 'reg' must be four bytes wide and aligned
Example: