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 ranges = <0x48300100 0x48300100 0x80 /* ECAP */ 30 0x48300180 0x48300180 0x80 /* EQEP */ 31 0x48300200 0x48300200 0x80>; /* EHRPWM */ 32 33 /* child nodes go here */ 34}; 35 36epwmss0: epwmss@48300000 { /* PWMSS for am4372 */ 37 compatible = "ti,am4372-pwmss","ti,am33xx-pwmss" 38 reg = <0x48300000 0x10>; 39 ti,hwmods = "epwmss0"; 40 #address-cells = <1>; 41 #size-cells = <1>; 42 ranges = <0x48300100 0x48300100 0x80 /* ECAP */ 43 0x48300180 0x48300180 0x80 /* EQEP */ 44 0x48300200 0x48300200 0x80>; /* EHRPWM */ 45 46 /* child nodes go here */ 47}; 48 49epwmss0: epwmss@4843e000 { /* PWMSS for DRA7xx */ 50 compatible = "ti,dra746-pwmss", "ti,am33xx-pwmss"; 51 reg = <0x4843e000 0x30>; 52 ti,hwmods = "epwmss0"; 53 #address-cells = <1>; 54 #size-cells = <1>; 55 ranges; 56 57 /* child nodes go here */ 58}; 59