1 ==============================================
2 Frequently asked questions about the sunxi clo
3 ==============================================
4
5 This document contains useful bits of informat
6 about the sunxi clock system, as well as accom
7
8 Q: Why is the main 24MHz oscillator gateable?
9 system?
10
11 A: The 24MHz oscillator allows gating to save
12 carelessly the system would stop functionin
13 steps, one can gate it and keep the system
14 simplified suspend example:
15
16 While the system is operational, you would
17
18 24MHz 32kHz
19 |
20 PLL1
21 \
22 \_ CPU Mux
23 |
24 [CPU]
25
26 When you are about to suspend, you switch t
27 oscillator::
28
29 24Mhz 32kHz
30 | |
31 PLL1 |
32 /
33 CPU Mux _/
34 |
35 [CPU]
36
37 Finally you can gate the main oscillator::
38
39 32kHz
40 |
41 |
42 /
43 CPU Mux _/
44 |
45 [CPU]
46
47 Q: Were can I learn more about the sunxi clock
48
49 A: The linux-sunxi wiki contains a page docume
50 you can find it at
51
52 http://linux-sunxi.org/A10/CCM
53
54 The authoritative source for information at
55 released by Allwinner, you can find it at
56
57 https://github.com/linux-sunxi/linux-s
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