1 * Nuvoton NPCM7XX Clock Controller
2
3 Nuvoton Poleg BMC NPCM7XX contains an integrat
4 generates and supplies clocks to all modules w
5
6 External clocks:
7
8 There are six fixed clocks that are generated
9 a known fixed value that cannot be changed. cl
10 clk_sysbypck are inputs to the clock controlle
11 clk_rg1refck, clk_rg2refck and clk_xin are ext
12 network. They are set on the device tree, but
13 network devices use them directly.
14 Example can be found below.
15
16 All available clocks are defined as preprocess
17 dt-bindings/clock/nuvoton,npcm7xx-clock.h
18 and can be reused as DT sources.
19
20 Required Properties of clock controller:
21
22 - compatible: "nuvoton,npcm750-clk" :
23 Poleg BMC NPCM750
24
25 - reg: physical base address of the cl
26 memory mapped region.
27
28 - #clock-cells: should be 1.
29
30 Example: Clock controller node:
31
32 clk: clock-controller@f0801000 {
33 compatible = "nuvoton,npcm750-
34 #clock-cells = <1>;
35 reg = <0xf0801000 0x1000>;
36 clock-names = "refclk", "sysby
37 clocks = <&clk_refclk>, <&clk_
38 };
39
40 Example: Required external clocks for network:
41
42 /* external reference clock */
43 clk_refclk: clk-refclk {
44 compatible = "fixed-clock";
45 #clock-cells = <0>;
46 clock-frequency = <25000000>;
47 clock-output-names = "refclk";
48 };
49
50 /* external reference clock for cpu. f
51 clk_sysbypck: clk-sysbypck {
52 compatible = "fixed-clock";
53 #clock-cells = <0>;
54 clock-frequency = <800000000>;
55 clock-output-names = "sysbypck
56 };
57
58 /* external reference clock for MC. fl
59 clk_mcbypck: clk-mcbypck {
60 compatible = "fixed-clock";
61 #clock-cells = <0>;
62 clock-frequency = <800000000>;
63 clock-output-names = "mcbypck"
64 };
65
66 /* external clock signal rg1refck, su
67 clk_rg1refck: clk-rg1refck {
68 compatible = "fixed-clock";
69 #clock-cells = <0>;
70 clock-frequency = <125000000>;
71 clock-output-names = "clk_rg1r
72 };
73
74 /* external clock signal rg2refck, su
75 clk_rg2refck: clk-rg2refck {
76 compatible = "fixed-clock";
77 #clock-cells = <0>;
78 clock-frequency = <125000000>;
79 clock-output-names = "clk_rg2r
80 };
81
82 clk_xin: clk-xin {
83 compatible = "fixed-clock";
84 #clock-cells = <0>;
85 clock-frequency = <50000000>;
86 clock-output-names = "clk_xin"
87 };
88
89
90 Example: GMAC controller node that consumes tw
91 clock controller and a fixed clock from DT (cl
92
93 ethernet0: ethernet@f0802000 {
94 compatible = "snps,dwmac";
95 reg = <0xf0802000 0x2000>;
96 interrupts = <0 14 4>;
97 interrupt-names = "macirq";
98 clocks = <&clk_rg1refck>, <&c
99 clock-names = "stmmaceth", "cl
100 };
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