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
18 1. Clock Block Binding
21 - compatible: Should contain a chip-specific clock block compatible
22 string and (if applicable) may contain a chassis-version clock
25 Chip-specific strings are of the form "fsl,<chip>-clockgen", such as:
26 * "fsl,p2041-clockgen"
27 * "fsl,p3041-clockgen"
28 * "fsl,p4080-clockgen"
29 * "fsl,p5020-clockgen"
30 * "fsl,p5040-clockgen"
31 * "fsl,t4240-clockgen"
32 * "fsl,b4420-clockgen"
33 * "fsl,b4860-clockgen"
34 * "fsl,ls1012a-clockgen"
35 * "fsl,ls1021a-clockgen"
36 * "fsl,ls1043a-clockgen"
37 * "fsl,ls1046a-clockgen"
38 * "fsl,ls1088a-clockgen"
39 * "fsl,ls2080a-clockgen"
40 Chassis-version clock strings include:
41 * "fsl,qoriq-clockgen-1.0": for chassis 1.0 clocks
42 * "fsl,qoriq-clockgen-2.0": for chassis 2.0 clocks
43 - reg: Describes the address of the device's resources within the
44 address space defined by its parent bus, and resource zero
45 represents the clock register set
48 - ranges: Allows valid translation between child's address space and
49 parent's. Must be present if the device has sub-nodes.
50 - #address-cells: Specifies the number of cells used to represent
51 physical base addresses. Must be present if the device has
52 sub-nodes and set to 1 if present
53 - #size-cells: Specifies the number of cells used to represent
54 the size of an address. Must be present if the device has
55 sub-nodes and set to 1 if present
56 - clock-frequency: Input system clock frequency (SYSCLK)
57 - clocks: If clock-frequency is not specified, sysclk may be provided
58 as an input clock. Either clock-frequency or clocks must be
60 A second input clock, called "coreclk", may be provided if
61 core PLLs are based on a different input clock from the
63 - clock-names: Required if a coreclk is present. Valid names are
64 "sysclk" and "coreclk".
68 The clockgen node should act as a clock provider, though in older device
69 trees the children of the clockgen node are the clock providers.
71 When the clockgen node is a clock provider, #clock-cells = <2>.
72 The first cell of the clock specifier is the clock type, and the
73 second cell is the clock index for the specified type.
77 1 cmux index (n in CLKCnCSR)
78 2 hwaccel index (n in CLKCGnHWACSR)
79 3 fman 0 for fm1, 1 for fm2
80 4 platform pll 0=pll, 1=pll/2, 2=pll/3, 3=pll/4
85 clockgen: global-utilities@e1000 {
86 compatible = "fsl,p5020-clockgen", "fsl,qoriq-clockgen-1.0";
87 clock-frequency = <133333333>;
88 reg = <0xe1000 0x1000>;
94 clocks = <&clockgen 3 0>;
100 NOTE: These nodes are deprecated. Kernels should continue to support
101 device trees with these nodes, but new device trees should not use them.
103 Most of the bindings are from the common clock binding[1].
104 [1] Documentation/devicetree/bindings/clock/clock-bindings.txt
107 - compatible : Should include one of the following:
108 * "fsl,qoriq-core-pll-1.0" for core PLL clocks (v1.0)
109 * "fsl,qoriq-core-pll-2.0" for core PLL clocks (v2.0)
110 * "fsl,qoriq-core-mux-1.0" for core mux clocks (v1.0)
111 * "fsl,qoriq-core-mux-2.0" for core mux clocks (v2.0)
112 * "fsl,qoriq-sysclk-1.0": for input system clock (v1.0).
113 It takes parent's clock-frequency as its clock.
114 * "fsl,qoriq-sysclk-2.0": for input system clock (v2.0).
115 It takes parent's clock-frequency as its clock.
116 * "fsl,qoriq-platform-pll-1.0" for the platform PLL clock (v1.0)
117 * "fsl,qoriq-platform-pll-2.0" for the platform PLL clock (v2.0)
118 - #clock-cells: From common clock binding. The number of cells in a
119 clock-specifier. Should be <0> for "fsl,qoriq-sysclk-[1,2].0"
120 clocks, or <1> for "fsl,qoriq-core-pll-[1,2].0" clocks.
121 For "fsl,qoriq-core-pll-[1,2].0" clocks, the single
122 clock-specifier cell may take the following values:
123 * 0 - equal to the PLL frequency
124 * 1 - equal to the PLL frequency divided by 2
125 * 2 - equal to the PLL frequency divided by 4
127 Recommended properties:
128 - clocks: Should be the phandle of input parent clock
129 - clock-names: From common clock binding, indicates the clock name
130 - clock-output-names: From common clock binding, indicates the names of
132 - reg: Should be the offset and length of clock block base address.
133 The length should be 4.
137 clockgen: global-utilities@e1000 {
138 compatible = "fsl,p5020-clockgen", "fsl,qoriq-clockgen-1.0";
139 ranges = <0x0 0xe1000 0x1000>;
140 clock-frequency = <133333333>;
141 reg = <0xe1000 0x1000>;
142 #address-cells = <1>;
147 compatible = "fsl,qoriq-sysclk-1.0";
148 clock-output-names = "sysclk";
154 compatible = "fsl,qoriq-core-pll-1.0";
156 clock-output-names = "pll0", "pll0-div2";
162 compatible = "fsl,qoriq-core-pll-1.0";
164 clock-output-names = "pll1", "pll1-div2";
170 compatible = "fsl,qoriq-core-mux-1.0";
171 clocks = <&pll0 0>, <&pll0 1>, <&pll1 0>, <&pll1 1>;
172 clock-names = "pll0", "pll0-div2", "pll1", "pll1-div2";
173 clock-output-names = "cmux0";
179 compatible = "fsl,qoriq-core-mux-1.0";
180 clocks = <&pll0 0>, <&pll0 1>, <&pll1 0>, <&pll1 1>;
181 clock-names = "pll0", "pll0-div2", "pll1", "pll1-div2";
182 clock-output-names = "cmux1";
185 platform-pll: platform-pll@c00 {
188 compatible = "fsl,qoriq-platform-pll-1.0";
190 clock-output-names = "platform-pll", "platform-pll-div2";
195 Example for legacy clock consumer:
198 cpu0: PowerPC,e5500@0 {