tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1Allwinner Clock Control Unit Binding
2------------------------------------
3
4Required properties :
5- compatible: must contain one of the following compatibles:
6 - "allwinner,sun6i-a31-ccu"
7 - "allwinner,sun8i-a23-ccu"
8 - "allwinner,sun8i-a33-ccu"
9 - "allwinner,sun8i-a83t-ccu"
10 - "allwinner,sun8i-a83t-r-ccu"
11 - "allwinner,sun8i-h3-ccu"
12 - "allwinner,sun8i-h3-r-ccu"
13 - "allwinner,sun8i-v3s-ccu"
14 - "allwinner,sun9i-a80-ccu"
15 - "allwinner,sun50i-a64-ccu"
16 - "allwinner,sun50i-a64-r-ccu"
17 - "allwinner,sun50i-h5-ccu"
18
19- reg: Must contain the registers base address and length
20- clocks: phandle to the oscillators feeding the CCU. Two are needed:
21 - "hosc": the high frequency oscillator (usually at 24MHz)
22 - "losc": the low frequency oscillator (usually at 32kHz)
23 On the A83T, this is the internal 16MHz oscillator divided by 512
24- clock-names: Must contain the clock names described just above
25- #clock-cells : must contain 1
26- #reset-cells : must contain 1
27
28For the PRCM CCUs on A83T/H3/A64, two more clocks are needed:
29- "pll-periph": the SoC's peripheral PLL from the main CCU
30- "iosc": the SoC's internal frequency oscillator
31
32Example for generic CCU:
33ccu: clock@01c20000 {
34 compatible = "allwinner,sun8i-h3-ccu";
35 reg = <0x01c20000 0x400>;
36 clocks = <&osc24M>, <&osc32k>;
37 clock-names = "hosc", "losc";
38 #clock-cells = <1>;
39 #reset-cells = <1>;
40};
41
42Example for PRCM CCU:
43r_ccu: clock@01f01400 {
44 compatible = "allwinner,sun50i-a64-r-ccu";
45 reg = <0x01f01400 0x100>;
46 clocks = <&osc24M>, <&osc32k>, <&iosc>, <&ccu CLK_PLL_PERIPH0>;
47 clock-names = "hosc", "losc", "iosc", "pll-periph";
48 #clock-cells = <1>;
49 #reset-cells = <1>;
50};