1* NXP LPC1850 CREG clocks 2 3The NXP LPC18xx/43xx CREG (Configuration Registers) block contains 4control registers for two low speed clocks. One of the clocks is a 532 kHz oscillator driver with power up/down and clock gating. Next 6is a fixed divider that creates a 1 kHz clock from the 32 kHz osc. 7 8These clocks are used by the RTC and the Event Router peripherials. 9The 32 kHz can also be routed to other peripherials to enable low 10power modes. 11 12This binding uses the common clock binding: 13 Documentation/devicetree/bindings/clock/clock-bindings.txt 14 15Required properties: 16- compatible: 17 Should be "nxp,lpc1850-creg-clk" 18- #clock-cells: 19 Shall have value <1>. 20- clocks: 21 Shall contain a phandle to the fixed 32 kHz crystal. 22 23The creg-clk node must be a child of the creg syscon node. 24 25The following clocks are available from the clock node. 26 27Clock ID Name 28 0 1 kHz clock 29 1 32 kHz Oscillator 30 31Example: 32soc { 33 creg: syscon@40043000 { 34 compatible = "nxp,lpc1850-creg", "syscon", "simple-mfd"; 35 reg = <0x40043000 0x1000>; 36 37 creg_clk: clock-controller { 38 compatible = "nxp,lpc1850-creg-clk"; 39 clocks = <&xtal32>; 40 #clock-cells = <1>; 41 }; 42 43 ... 44 }; 45 46 rtc: rtc@40046000 { 47 ... 48 clocks = <&creg_clk 0>, <&ccu1 CLK_CPU_BUS>; 49 clock-names = "rtc", "reg"; 50 ... 51 }; 52}; 53