summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/clock/mvebu-core-clock.txt
blob: d8f5c490f893236528182d5f434895e1e7f729f0 (plain)
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
* Core Clock bindings for Marvell MVEBU SoCs

Marvell MVEBU SoCs usually allow to determine core clock frequencies by
reading the Sample-At-Reset (SAR) register. The core clock consumer should
specify the desired clock by having the clock ID in its "clocks" phandle cell.

The following is a list of provided IDs and clock names on Armada 370/XP:
 0 = tclk    (Internal Bus clock)
 1 = cpuclk  (CPU clock)
 2 = nbclk   (L2 Cache clock)
 3 = hclk    (DRAM control clock)
 4 = dramclk (DDR clock)

The following is a list of provided IDs and clock names on Armada 375:
 0 = tclk    (Internal Bus clock)
 1 = cpuclk  (CPU clock)
 2 = l2clk   (L2 Cache clock)
 3 = ddrclk  (DDR clock)

The following is a list of provided IDs and clock names on Armada 380/385:
 0 = tclk    (Internal Bus clock)
 1 = cpuclk  (CPU clock)
 2 = l2clk   (L2 Cache clock)
 3 = ddrclk  (DDR clock)

The following is a list of provided IDs and clock names on Armada 39x:
 0 = tclk    (Internal Bus clock)
 1 = cpuclk  (CPU clock)
 2 = nbclk   (Coherent Fabric clock)
 3 = hclk    (SDRAM Controller Internal Clock)
 4 = dclk    (SDRAM Interface Clock)
 5 = refclk  (Reference Clock)

The following is a list of provided IDs and clock names on 98dx3236:
 0 = tclk    (Internal Bus clock)
 1 = cpuclk  (CPU clock)
 2 = ddrclk   (DDR clock)
 3 = mpll    (MPLL Clock)

The following is a list of provided IDs and clock names on Kirkwood and Dove:
 0 = tclk   (Internal Bus clock)
 1 = cpuclk (CPU0 clock)
 2 = l2clk  (L2 Cache clock derived from CPU0 clock)
 3 = ddrclk (DDR controller clock derived from CPU0 clock)

The following is a list of provided IDs and clock names on Orion5x:
 0 = tclk   (Internal Bus clock)
 1 = cpuclk (CPU0 clock)
 2 = ddrclk (DDR controller clock derived from CPU0 clock)

Required properties:
- compatible : shall be one of the following:
	"marvell,armada-370-core-clock" - For Armada 370 SoC core clocks
	"marvell,armada-375-core-clock" - For Armada 375 SoC core clocks
	"marvell,armada-380-core-clock" - For Armada 380/385 SoC core clocks
	"marvell,armada-390-core-clock" - For Armada 39x SoC core clocks
	"marvell,armada-xp-core-clock" - For Armada XP SoC core clocks
	"marvell,mv98dx3236-core-clock" - For 98dx3236 family SoC core clocks
	"marvell,dove-core-clock" - for Dove SoC core clocks
	"marvell,kirkwood-core-clock" - for Kirkwood SoC (except mv88f6180)
	"marvell,mv88f6180-core-clock" - for Kirkwood MV88f6180 SoC
	"marvell,mv98dx1135-core-clock" - for Kirkwood 98dx1135 SoC
	"marvell,mv88f5181-core-clock" - for Orion MV88F5181 SoC
	"marvell,mv88f5182-core-clock" - for Orion MV88F5182 SoC
	"marvell,mv88f5281-core-clock" - for Orion MV88F5281 SoC
	"marvell,mv88f6183-core-clock" - for Orion MV88F6183 SoC
- reg : shall be the register address of the Sample-At-Reset (SAR) register
- #clock-cells : from common clock binding; shall be set to 1

Optional properties:
- clock-output-names : from common clock binding; allows overwrite default clock
	output names ("tclk", "cpuclk", "l2clk", "ddrclk")

Example:

core_clk: core-clocks@d0214 {
	compatible = "marvell,dove-core-clock";
	reg = <0xd0214 0x4>;
	#clock-cells = <1>;
};

spi0: spi@10600 {
	compatible = "marvell,orion-spi";
	/* ... */
	/* get tclk from core clock provider */
	clocks = <&core_clk 0>;
};