tjh.dev
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1Ingenic SoC CGU binding
2
3The CGU in an Ingenic SoC provides all the clocks generated on-chip. It
4typically includes a variety of PLLs, multiplexers, dividers & gates in order
5to provide many different clock signals derived from only 2 external source
6clocks.
7
8Required properties:
9- compatible : Should be one of:
10 * ingenic,jz4740-cgu
11 * ingenic,jz4725b-cgu
12 * ingenic,jz4770-cgu
13 * ingenic,jz4780-cgu
14- reg : The address & length of the CGU registers.
15- clocks : List of phandle & clock specifiers for clocks external to the CGU.
16 Two such external clocks should be specified - first the external crystal
17 "ext" and second the RTC clock source "rtc".
18- clock-names : List of name strings for the external clocks.
19- #clock-cells: Should be 1.
20 Clock consumers specify this argument to identify a clock. The valid values
21 may be found in <dt-bindings/clock/<soctype>-cgu.h>.
22
23Example SoC include file:
24
25/ {
26 cgu: jz4740-cgu {
27 compatible = "ingenic,jz4740-cgu";
28 reg = <0x10000000 0x100>;
29 #clock-cells = <1>;
30 };
31
32 uart0: serial@10030000 {
33 clocks = <&cgu JZ4740_CLK_UART0>;
34 };
35};
36
37Example board file:
38
39/ {
40 ext: clock@0 {
41 compatible = "fixed-clock";
42 #clock-cells = <0>;
43 clock-frequency = <12000000>;
44 };
45
46 rtc: clock@1 {
47 compatible = "fixed-clock";
48 #clock-cells = <0>;
49 clock-frequency = <32768>;
50 };
51
52 &cgu {
53 clocks = <&ext> <&rtc>;
54 clock-names: "ext", "rtc";
55 };
56};