projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| af0ba001 PA |
1 | TI SOC based PWM Subsystem |
| 2 | ||
| 3 | Required properties: | |
| 4 | - compatible: Must be "ti,am33xx-pwmss"; | |
| 5 | - reg: physical base address and size of the registers map. | |
| 6 | - address-cells: Specify the number of u32 entries needed in child nodes. | |
| 7 | Should set to 1. | |
| 8 | - size-cells: specify number of u32 entries needed to specify child nodes size | |
| 9 | in reg property. Should set to 1. | |
| 10 | - ranges: describes the address mapping of a memory-mapped bus. Should set to | |
| 11 | physical address map of child's base address, physical address within | |
| 12 | parent's address space and length of the address map. For am33xx, | |
| 13 | 3 set of child register maps present, ECAP register space, EQEP | |
| 14 | register space, EHRPWM register space. | |
| 15 | ||
| 16 | Also child nodes should also populated under PWMSS DT node. | |
| 17 | ||
| 18 | Example: | |
| 19 | pwmss0: pwmss@48300000 { | |
| 20 | compatible = "ti,am33xx-pwmss"; | |
| 21 | reg = <0x48300000 0x10>; | |
| 22 | ti,hwmods = "epwmss0"; | |
| 23 | #address-cells = <1>; | |
| 24 | #size-cells = <1>; | |
| 25 | status = "disabled"; | |
| 26 | ranges = <0x48300100 0x48300100 0x80 /* ECAP */ | |
| 27 | 0x48300180 0x48300180 0x80 /* EQEP */ | |
| 28 | 0x48300200 0x48300200 0x80>; /* EHRPWM */ | |
| 29 | ||
| 30 | /* child nodes go here */ | |
| 31 | }; |