xref: /freebsd/sys/contrib/device-tree/Bindings/rng/timeriomem_rng.txt (revision 924226fba12cc9a228c73b956e1b7fa24c60b055)
1HWRNG support for the timeriomem_rng driver
2
3Required properties:
4- compatible : "timeriomem_rng"
5- reg : base address to sample from
6- period : wait time in microseconds to use between samples
7
8Optional properties:
9- quality : estimated number of bits of true entropy per 1024 bits read from the
10            rng.  Defaults to zero which causes the kernel's default quality to
11            be used instead.  Note that the default quality is usually zero
12            which disables using this rng to automatically fill the kernel's
13            entropy pool.
14
15N.B. currently 'reg' must be at least four bytes wide and 32-bit aligned
16
17Example:
18
19hwrng@44 {
20	#address-cells = <1>;
21	#size-cells = <1>;
22	compatible = "timeriomem_rng";
23	reg = <0x44 0x04>;
24	period = <1000000>;
25};
26