1 * Clock Block on Freescale QorIQ Platforms
3 Freescale qoriq chips take primary clocking input from the external
4 SYSCLK signal. The SYSCLK input (frequency) is multiplied using
5 multiple phase locked loops (PLL) to create a variety of frequencies
6 which can then be passed to a variety of internal logic, including
7 cores and peripheral IP blocks.
8 Please refer to the Reference Manual for details.
10 All references to "1.0" and "2.0" refer to the QorIQ chassis version to
11 which the chip complies.
13 Chassis Version Example Chips
14 --------------- -------------
15 1.0 p4080, p5020, p5040
16 2.0 t4240, b4860, t1040
18 1. Clock Block Binding
21 - compatible: Should contain a specific clock block compatible string
22 and a single chassis clock compatible string.
23 Clock block strings include, but not limited to, one of the:
24 * "fsl,p2041-clockgen"
25 * "fsl,p3041-clockgen"
26 * "fsl,p4080-clockgen"
27 * "fsl,p5020-clockgen"
28 * "fsl,p5040-clockgen"
29 * "fsl,t4240-clockgen"
30 * "fsl,b4420-clockgen"
31 * "fsl,b4860-clockgen"
32 * "fsl,ls1021a-clockgen"
33 Chassis clock strings include:
34 * "fsl,qoriq-clockgen-1.0": for chassis 1.0 clocks
35 * "fsl,qoriq-clockgen-2.0": for chassis 2.0 clocks
36 - reg: Describes the address of the device's resources within the
37 address space defined by its parent bus, and resource zero
38 represents the clock register set
39 - clock-frequency: Input system clock frequency
41 Recommended properties:
42 - ranges: Allows valid translation between child's address space and
43 parent's. Must be present if the device has sub-nodes.
44 - #address-cells: Specifies the number of cells used to represent
45 physical base addresses. Must be present if the device has
46 sub-nodes and set to 1 if present
47 - #size-cells: Specifies the number of cells used to represent
48 the size of an address. Must be present if the device has
49 sub-nodes and set to 1 if present
51 2. Clock Provider/Consumer Binding
53 Most of the bindings are from the common clock binding[1].
54 [1] Documentation/devicetree/bindings/clock/clock-bindings.txt
57 - compatible : Should include one of the following:
58 * "fsl,qoriq-core-pll-1.0" for core PLL clocks (v1.0)
59 * "fsl,qoriq-core-pll-2.0" for core PLL clocks (v2.0)
60 * "fsl,qoriq-core-mux-1.0" for core mux clocks (v1.0)
61 * "fsl,qoriq-core-mux-2.0" for core mux clocks (v2.0)
62 * "fsl,qoriq-sysclk-1.0": for input system clock (v1.0).
63 It takes parent's clock-frequency as its clock.
64 * "fsl,qoriq-sysclk-2.0": for input system clock (v2.0).
65 It takes parent's clock-frequency as its clock.
66 * "fsl,qoriq-platform-pll-1.0" for the platform PLL clock (v1.0)
67 * "fsl,qoriq-platform-pll-2.0" for the platform PLL clock (v2.0)
68 - #clock-cells: From common clock binding. The number of cells in a
69 clock-specifier. Should be <0> for "fsl,qoriq-sysclk-[1,2].0"
70 clocks, or <1> for "fsl,qoriq-core-pll-[1,2].0" clocks.
71 For "fsl,qoriq-core-pll-[1,2].0" clocks, the single
72 clock-specifier cell may take the following values:
73 * 0 - equal to the PLL frequency
74 * 1 - equal to the PLL frequency divided by 2
75 * 2 - equal to the PLL frequency divided by 4
77 Recommended properties:
78 - clocks: Should be the phandle of input parent clock
79 - clock-names: From common clock binding, indicates the clock name
80 - clock-output-names: From common clock binding, indicates the names of
82 - reg: Should be the offset and length of clock block base address.
83 The length should be 4.
85 Example for clock block and clock provider:
87 clockgen: global-utilities@e1000 {
88 compatible = "fsl,p5020-clockgen", "fsl,qoriq-clockgen-1.0";
89 ranges = <0x0 0xe1000 0x1000>;
90 clock-frequency = <133333333>;
91 reg = <0xe1000 0x1000>;
97 compatible = "fsl,qoriq-sysclk-1.0";
98 clock-output-names = "sysclk";
104 compatible = "fsl,qoriq-core-pll-1.0";
106 clock-output-names = "pll0", "pll0-div2";
112 compatible = "fsl,qoriq-core-pll-1.0";
114 clock-output-names = "pll1", "pll1-div2";
120 compatible = "fsl,qoriq-core-mux-1.0";
121 clocks = <&pll0 0>, <&pll0 1>, <&pll1 0>, <&pll1 1>;
122 clock-names = "pll0", "pll0-div2", "pll1", "pll1-div2";
123 clock-output-names = "cmux0";
129 compatible = "fsl,qoriq-core-mux-1.0";
130 clocks = <&pll0 0>, <&pll0 1>, <&pll1 0>, <&pll1 1>;
131 clock-names = "pll0", "pll0-div2", "pll1", "pll1-div2";
132 clock-output-names = "cmux1";
135 platform-pll: platform-pll@c00 {
138 compatible = "fsl,qoriq-platform-pll-1.0";
140 clock-output-names = "platform-pll", "platform-pll-div2";
145 Example for clock consumer:
148 cpu0: PowerPC,e5500@0 {