1Texas Instruments clkctrl clock binding 2 3Texas Instruments SoCs can have a clkctrl clock controller for each 4interconnect target module. The clkctrl clock controller manages functional 5and interface clocks for each module. Each clkctrl controller can also 6gate one or more optional functional clocks for a module, and can have one 7or more clock muxes. There is a clkctrl clock controller typically for each 8interconnect target module on omap4 and later variants. 9 10The clock consumers can specify the index of the clkctrl clock using 11the hardware offset from the clkctrl instance register space. The optional 12clocks can be specified by clkctrl hardware offset and the index of the 13optional clock. 14 15For more information, please see the Linux clock framework binding at 16Documentation/devicetree/bindings/clock/clock-bindings.txt. 17 18Required properties : 19- compatible : shall be "ti,clkctrl" or a clock domain specific name: 20 "ti,clkctrl-l4-cfg" 21 "ti,clkctrl-l4-per" 22 "ti,clkctrl-l4-secure" 23 "ti,clkctrl-l4-wkup" 24- clock-output-names : from common clock binding 25- #clock-cells : shall contain 2 with the first entry being the instance 26 offset from the clock domain base and the second being the 27 clock index 28- reg : clock registers 29 30Example: Clock controller node on omap 4430: 31 32&cm2 { 33 l4per: cm@1400 { 34 cm_l4per@0 { 35 cm_l4per_clkctrl: clock@20 { 36 compatible = "ti,clkctrl"; 37 clock-output-names = "l4_per"; 38 reg = <0x20 0x1b0>; 39 #clock-cells = <2>; 40 }; 41 }; 42 }; 43}; 44 45Example: Preprocessor helper macros in dt-bindings/clock/ti-clkctrl.h 46 47#define OMAP4_CLKCTRL_OFFSET 0x20 48#define OMAP4_CLKCTRL_INDEX(offset) ((offset) - OMAP4_CLKCTRL_OFFSET) 49#define MODULEMODE_HWCTRL 1 50#define MODULEMODE_SWCTRL 2 51 52#define OMAP4_GPTIMER10_CLKTRL OMAP4_CLKCTRL_INDEX(0x28) 53#define OMAP4_GPTIMER11_CLKTRL OMAP4_CLKCTRL_INDEX(0x30) 54#define OMAP4_GPTIMER2_CLKTRL OMAP4_CLKCTRL_INDEX(0x38) 55... 56#define OMAP4_GPIO2_CLKCTRL OMAP_CLKCTRL_INDEX(0x60) 57 58Example: Clock consumer node for GPIO2: 59 60&gpio2 { 61 clocks = <&cm_l4per_clkctrl OMAP4_GPIO2_CLKCTRL 0 62 &cm_l4per_clkctrl OMAP4_GPIO2_CLKCTRL 8>; 63}; 64