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1Device Tree Clock bindings for arch-vt8500
2
3This binding uses the common clock binding[1].
4
5[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
6
7Required properties:
8- compatible : shall be one of the following:
9 "via,vt8500-pll-clock" - for a VT8500/WM8505 PLL clock
10 "wm,wm8650-pll-clock" - for a WM8650 PLL clock
11 "via,vt8500-device-clock" - for a VT/WM device clock
12
13Required properties for PLL clocks:
14- reg : shall be the control register offset from PMC base for the pll clock.
15- clocks : shall be the input parent clock phandle for the clock. This should
16 be the reference clock.
17- #clock-cells : from common clock binding; shall be set to 0.
18
19Required properties for device clocks:
20- clocks : shall be the input parent clock phandle for the clock. This should
21 be a pll output.
22- #clock-cells : from common clock binding; shall be set to 0.
23
24
25Device Clocks
26
27Device clocks are required to have one or both of the following sets of
28properties:
29
30
31Gated device clocks:
32
33Required properties:
34- enable-reg : shall be the register offset from PMC base for the enable
35 register.
36- enable-bit : shall be the bit within enable-reg to enable/disable the clock.
37
38
39Divisor device clocks:
40
41Required property:
42- divisor-reg : shall be the register offset from PMC base for the divisor
43 register.
44Optional property:
45- divisor-mask : shall be the mask for the divisor register. Defaults to 0x1f
46 if not specified.
47
48
49For example:
50
51ref25: ref25M {
52 #clock-cells = <0>;
53 compatible = "fixed-clock";
54 clock-frequency = <25000000>;
55};
56
57plla: plla {
58 #clock-cells = <0>;
59 compatible = "wm,wm8650-pll-clock";
60 clocks = <&ref25>;
61 reg = <0x200>;
62};
63
64sdhc: sdhc {
65 #clock-cells = <0>;
66 compatible = "via,vt8500-device-clock";
67 clocks = <&pllb>;
68 divisor-reg = <0x328>;
69 divisor-mask = <0x3f>;
70 enable-reg = <0x254>;
71 enable-bit = <18>;
72};