1 * Rockchip PX30 Clock and Reset Unit
3 The PX30 clock controller generates and supplies clock to various
4 controllers within the SoC and also implements a reset controller for SoC
9 - compatible: PMU for CRU should be "rockchip,px30-pmu-cru"
10 - compatible: CRU should be "rockchip,px30-cru"
11 - reg: physical base address of the controller and length of memory mapped
13 - clocks: A list of phandle + clock-specifier pairs for the clocks listed
15 - clock-names: Should contain the following:
16 - "xin24m" for both PMUCRU and CRU
17 - "gpll" for CRU (sourced from PMUCRU)
18 - #clock-cells: should be 1.
19 - #reset-cells: should be 1.
23 - rockchip,grf: phandle to the syscon managing the "general register files"
24 If missing, pll rates are not changeable, due to the missing pll lock status.
26 Each clock is assigned an identifier and client nodes can use this identifier
27 to specify the clock which they consume. All available clocks are defined as
28 preprocessor macros in the dt-bindings/clock/px30-cru.h headers and can be
29 used in device tree sources. Similar macros exist for the reset sources in
34 There are several clocks that are generated outside the SoC. It is expected
35 that they are defined using standard clock bindings with following
37 - "xin24m" - crystal input - required,
38 - "xin32k" - rtc clock - optional,
39 - "i2sx_clkin" - external I2S clock - optional,
40 - "gmac_clkin" - external GMAC clock - optional
42 Example: Clock controller node:
44 pmucru: clock-controller@ff2bc000 {
45 compatible = "rockchip,px30-pmucru";
46 reg = <0x0 0xff2bc000 0x0 0x1000>;
51 cru: clock-controller@ff2b0000 {
52 compatible = "rockchip,px30-cru";
53 reg = <0x0 0xff2b0000 0x0 0x1000>;
54 rockchip,grf = <&grf>;
59 Example: UART controller node that consumes the clock generated by the clock
62 uart0: serial@ff030000 {
63 compatible = "rockchip,px30-uart", "snps,dw-apb-uart";
64 reg = <0x0 0xff030000 0x0 0x100>;
65 interrupts = <GIC_SPI 15 IRQ_TYPE_LEVEL_HIGH>;
66 clocks = <&pmucru SCLK_UART0_PMU>, <&pmucru PCLK_UART0_PMU>;
67 clock-names = "baudclk", "apb_pclk";