1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
* Clock Block on Freescale CoreNet Platforms
Freescale CoreNet chips take primary clocking input from the external
SYSCLK signal. The SYSCLK input (frequency) is multiplied using
multiple phase locked loops (PLL) to create a variety of frequencies
which can then be passed to a variety of internal logic, including
cores and peripheral IP blocks.
Please refer to the Reference Manual for details.
1. Clock Block Binding
Required properties:
- compatible: Should contain a specific clock block compatible string
and a single chassis clock compatible string.
Clock block strings include, but not limited to, one of the:
* "fsl,p2041-clockgen"
* "fsl,p3041-clockgen"
* "fsl,p4080-clockgen"
* "fsl,p5020-clockgen"
* "fsl,p5040-clockgen"
* "fsl,t4240-clockgen"
* "fsl,b4420-clockgen"
* "fsl,b4860-clockgen"
Chassis clock strings include:
* "fsl,qoriq-clockgen-1.0": for chassis 1.0 clocks
* "fsl,qoriq-clockgen-2.0": for chassis 2.0 clocks
- reg: Describes the address of the device's resources within the
address space defined by its parent bus, and resource zero
represents the clock register set
- clock-frequency: Input system clock frequency
Recommended properties:
- ranges: Allows valid translation between child's address space and
parent's. Must be present if the device has sub-nodes.
- #address-cells: Specifies the number of cells used to represent
physical base addresses. Must be present if the device has
sub-nodes and set to 1 if present
- #size-cells: Specifies the number of cells used to represent
the size of an address. Must be present if the device has
sub-nodes and set to 1 if present
2. Clock Provider/Consumer Binding
Most of the bindings are from the common clock binding[1].
[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
Required properties:
- compatible : Should include one of the following:
* "fsl,qoriq-core-pll-1.0" for core PLL clocks (v1.0)
* "fsl,qoriq-core-pll-2.0" for core PLL clocks (v2.0)
* "fsl,qoriq-core-mux-1.0" for core mux clocks (v1.0)
* "fsl,qoriq-core-mux-2.0" for core mux clocks (v2.0)
* "fsl,qoriq-sysclk-1.0": for input system clock (v1.0).
It takes parent's clock-frequency as its clock.
* "fsl,qoriq-sysclk-2.0": for input system clock (v2.0).
It takes parent's clock-frequency as its clock.
- #clock-cells: From common clock binding. The number of cells in a
clock-specifier. Should be <0> for "fsl,qoriq-sysclk-[1,2].0"
clocks, or <1> for "fsl,qoriq-core-pll-[1,2].0" clocks.
For "fsl,qoriq-core-pll-[1,2].0" clocks, the single
clock-specifier cell may take the following values:
* 0 - equal to the PLL frequency
* 1 - equal to the PLL frequency divided by 2
* 2 - equal to the PLL frequency divided by 4
Recommended properties:
- clocks: Should be the phandle of input parent clock
- clock-names: From common clock binding, indicates the clock name
- clock-output-names: From common clock binding, indicates the names of
output clocks
- reg: Should be the offset and length of clock block base address.
The length should be 4.
Example for clock block and clock provider:
/ {
clockgen: global-utilities@e1000 {
compatible = "fsl,p5020-clockgen", "fsl,qoriq-clockgen-1.0";
ranges = <0x0 0xe1000 0x1000>;
clock-frequency = <133333333>;
reg = <0xe1000 0x1000>;
#address-cells = <1>;
#size-cells = <1>;
sysclk: sysclk {
#clock-cells = <0>;
compatible = "fsl,qoriq-sysclk-1.0";
clock-output-names = "sysclk";
}
pll0: pll0@800 {
#clock-cells = <1>;
reg = <0x800 0x4>;
compatible = "fsl,qoriq-core-pll-1.0";
clocks = <&sysclk>;
clock-output-names = "pll0", "pll0-div2";
};
pll1: pll1@820 {
#clock-cells = <1>;
reg = <0x820 0x4>;
compatible = "fsl,qoriq-core-pll-1.0";
clocks = <&sysclk>;
clock-output-names = "pll1", "pll1-div2";
};
mux0: mux0@0 {
#clock-cells = <0>;
reg = <0x0 0x4>;
compatible = "fsl,qoriq-core-mux-1.0";
clocks = <&pll0 0>, <&pll0 1>, <&pll1 0>, <&pll1 1>;
clock-names = "pll0", "pll0-div2", "pll1", "pll1-div2";
clock-output-names = "cmux0";
};
mux1: mux1@20 {
#clock-cells = <0>;
reg = <0x20 0x4>;
compatible = "fsl,qoriq-core-mux-1.0";
clocks = <&pll0 0>, <&pll0 1>, <&pll1 0>, <&pll1 1>;
clock-names = "pll0", "pll0-div2", "pll1", "pll1-div2";
clock-output-names = "cmux1";
};
};
}
Example for clock consumer:
/ {
cpu0: PowerPC,e5500@0 {
...
clocks = <&mux0>;
...
};
}
|
