xref: /OK3568_Linux_fs/kernel/Documentation/devicetree/bindings/clock/fixed-mmio-clock.txt (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593SmuzhiyunBinding for simple memory mapped io fixed-rate clock sources.
2*4882a593SmuzhiyunThe driver reads a clock frequency value from a single 32-bit memory mapped
3*4882a593SmuzhiyunI/O register and registers it as a fixed rate clock.
4*4882a593Smuzhiyun
5*4882a593SmuzhiyunIt was designed for test systems, like FPGA, not for complete, finished SoCs.
6*4882a593Smuzhiyun
7*4882a593SmuzhiyunThis binding uses the common clock binding[1].
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
10*4882a593Smuzhiyun
11*4882a593SmuzhiyunRequired properties:
12*4882a593Smuzhiyun- compatible : shall be "fixed-mmio-clock".
13*4882a593Smuzhiyun- #clock-cells : from common clock binding; shall be set to 0.
14*4882a593Smuzhiyun- reg : Address and length of the clock value register set.
15*4882a593Smuzhiyun
16*4882a593SmuzhiyunOptional properties:
17*4882a593Smuzhiyun- clock-output-names : From common clock binding.
18*4882a593Smuzhiyun
19*4882a593SmuzhiyunExample:
20*4882a593Smuzhiyunsysclock: sysclock@fd020004 {
21*4882a593Smuzhiyun	#clock-cells = <0>;
22*4882a593Smuzhiyun	compatible = "fixed-mmio-clock";
23*4882a593Smuzhiyun	reg = <0xfd020004 0x4>;
24*4882a593Smuzhiyun};
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