tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1* Amlogic GXBB Clock and Reset Unit
2
3The Amlogic GXBB clock controller generates and supplies clock to various
4controllers within the SoC.
5
6Required Properties:
7
8- compatible: should be:
9 "amlogic,gxbb-clkc" for GXBB SoC,
10 "amlogic,gxl-clkc" for GXL and GXM SoC,
11 "amlogic,axg-clkc" for AXG SoC.
12 "amlogic,g12a-clkc" for G12A SoC.
13 "amlogic,g12b-clkc" for G12B SoC.
14- clocks : list of clock phandle, one for each entry clock-names.
15- clock-names : should contain the following:
16 * "xtal": the platform xtal
17
18- #clock-cells: should be 1.
19
20Each clock is assigned an identifier and client nodes can use this identifier
21to specify the clock which they consume. All available clocks are defined as
22preprocessor macros in the dt-bindings/clock/gxbb-clkc.h header and can be
23used in device tree sources.
24
25Parent node should have the following properties :
26- compatible: "syscon", "simple-mfd, and "amlogic,meson-gx-hhi-sysctrl" or
27 "amlogic,meson-axg-hhi-sysctrl"
28- reg: base address and size of the HHI system control register space.
29
30Example: Clock controller node:
31
32sysctrl: system-controller@0 {
33 compatible = "amlogic,meson-gx-hhi-sysctrl", "syscon", "simple-mfd";
34 reg = <0 0 0 0x400>;
35
36 clkc: clock-controller {
37 #clock-cells = <1>;
38 compatible = "amlogic,gxbb-clkc";
39 clocks = <&xtal>;
40 clock-names = "xtal";
41 };
42};
43
44Example: UART controller node that consumes the clock generated by the clock
45 controller:
46
47 uart_AO: serial@c81004c0 {
48 compatible = "amlogic,meson-uart";
49 reg = <0xc81004c0 0x14>;
50 interrupts = <0 90 1>;
51 clocks = <&clkc CLKID_CLK81>;
52 };