1TI SOC based PWM Subsystem 2 3Required properties: 4- compatible: Must be "ti,<soc>-pwmss". 5 for am33xx - compatible = "ti,am33xx-pwmss"; 6 for am4372 - compatible = "ti,am4372-pwmss","ti,am33xx-pwmss"; 7 for dra746 - compatible = "ti,dra746-pwmss", "ti,am33xx-pwmss" 8 9- reg: physical base address and size of the registers map. 10- address-cells: Specify the number of u32 entries needed in child nodes. 11 Should set to 1. 12- size-cells: specify number of u32 entries needed to specify child nodes size 13 in reg property. Should set to 1. 14- ranges: describes the address mapping of a memory-mapped bus. Should set to 15 physical address map of child's base address, physical address within 16 parent's address space and length of the address map. For am33xx, 17 3 set of child register maps present, ECAP register space, EQEP 18 register space, EHRPWM register space. 19 20Also child nodes should also populated under PWMSS DT node. 21 22Example: 23epwmss0: epwmss@48300000 { /* PWMSS for am33xx */ 24 compatible = "ti,am33xx-pwmss"; 25 reg = <0x48300000 0x10>; 26 ti,hwmods = "epwmss0"; 27 #address-cells = <1>; 28 #size-cells = <1>; 29 status = "disabled"; 30 ranges = <0x48300100 0x48300100 0x80 /* ECAP */ 31 0x48300180 0x48300180 0x80 /* EQEP */ 32 0x48300200 0x48300200 0x80>; /* EHRPWM */ 33 34 /* child nodes go here */ 35}; 36 37epwmss0: epwmss@48300000 { /* PWMSS for am4372 */ 38 compatible = "ti,am4372-pwmss","ti,am33xx-pwmss" 39 reg = <0x48300000 0x10>; 40 ti,hwmods = "epwmss0"; 41 #address-cells = <1>; 42 #size-cells = <1>; 43 status = "disabled"; 44 ranges = <0x48300100 0x48300100 0x80 /* ECAP */ 45 0x48300180 0x48300180 0x80 /* EQEP */ 46 0x48300200 0x48300200 0x80>; /* EHRPWM */ 47 48 /* child nodes go here */ 49}; 50 51epwmss0: epwmss@4843e000 { /* PWMSS for DRA7xx */ 52 compatible = "ti,dra746-pwmss", "ti,am33xx-pwmss"; 53 reg = <0x4843e000 0x30>; 54 ti,hwmods = "epwmss0"; 55 #address-cells = <1>; 56 #size-cells = <1>; 57 ranges; 58 59 /* child nodes go here */ 60}; 61