1 TI SOC based PWM Subsystem 1 TI SOC based PWM Subsystem
2 2
3 Required properties: 3 Required properties:
4 - compatible: Must be "ti,<soc>-pwmss". 4 - compatible: Must be "ti,<soc>-pwmss".
5 for am33xx - compatible = "ti,am33xx-pwmss" 5 for am33xx - compatible = "ti,am33xx-pwmss";
6 for am4372 - compatible = "ti,am4372-pwmss" 6 for am4372 - compatible = "ti,am4372-pwmss","ti,am33xx-pwmss";
7 for dra746 - compatible = "ti,dra746-pwmss", 7 for dra746 - compatible = "ti,dra746-pwmss", "ti,am33xx-pwmss"
8 8
9 - reg: physical base address and size of the r 9 - reg: physical base address and size of the registers map.
10 - address-cells: Specify the number of u32 ent 10 - address-cells: Specify the number of u32 entries needed in child nodes.
11 Should set to 1. 11 Should set to 1.
12 - size-cells: specify number of u32 entries ne 12 - size-cells: specify number of u32 entries needed to specify child nodes size
13 in reg property. Should set to 13 in reg property. Should set to 1.
14 - ranges: describes the address mapping of a m 14 - ranges: describes the address mapping of a memory-mapped bus. Should set to
15 physical address map of child's bas 15 physical address map of child's base address, physical address within
16 parent's address space and length 16 parent's address space and length of the address map. For am33xx,
17 3 set of child register maps presen 17 3 set of child register maps present, ECAP register space, EQEP
18 register space, EHRPWM register spa 18 register space, EHRPWM register space.
19 19
20 Also child nodes should also populated under P 20 Also child nodes should also populated under PWMSS DT node.
21 21
22 Example: 22 Example:
23 epwmss0: epwmss@48300000 { /* PWMSS for am33xx 23 epwmss0: epwmss@48300000 { /* PWMSS for am33xx */
24 compatible = "ti,am33xx-pwmss"; 24 compatible = "ti,am33xx-pwmss";
25 reg = <0x48300000 0x10>; 25 reg = <0x48300000 0x10>;
26 ti,hwmods = "epwmss0"; 26 ti,hwmods = "epwmss0";
27 #address-cells = <1>; 27 #address-cells = <1>;
28 #size-cells = <1>; 28 #size-cells = <1>;
29 ranges = <0x48300100 0x48300100 0x80 29 ranges = <0x48300100 0x48300100 0x80 /* ECAP */
30 0x48300180 0x48300180 0x80 30 0x48300180 0x48300180 0x80 /* EQEP */
31 0x48300200 0x48300200 0x80>; 31 0x48300200 0x48300200 0x80>; /* EHRPWM */
32 32
33 /* child nodes go here */ 33 /* child nodes go here */
34 }; 34 };
35 35
36 epwmss0: epwmss@48300000 { /* PWMSS for am4372 36 epwmss0: epwmss@48300000 { /* PWMSS for am4372 */
37 compatible = "ti,am4372-pwmss","ti,am3 37 compatible = "ti,am4372-pwmss","ti,am33xx-pwmss"
38 reg = <0x48300000 0x10>; 38 reg = <0x48300000 0x10>;
39 ti,hwmods = "epwmss0"; 39 ti,hwmods = "epwmss0";
40 #address-cells = <1>; 40 #address-cells = <1>;
41 #size-cells = <1>; 41 #size-cells = <1>;
42 ranges = <0x48300100 0x48300100 0x80 42 ranges = <0x48300100 0x48300100 0x80 /* ECAP */
43 0x48300180 0x48300180 0x80 43 0x48300180 0x48300180 0x80 /* EQEP */
44 0x48300200 0x48300200 0x80>; 44 0x48300200 0x48300200 0x80>; /* EHRPWM */
45 45
46 /* child nodes go here */ 46 /* child nodes go here */
47 }; 47 };
48 48
49 epwmss0: epwmss@4843e000 { /* PWMSS for DRA7xx 49 epwmss0: epwmss@4843e000 { /* PWMSS for DRA7xx */
50 compatible = "ti,dra746-pwmss", "ti,am 50 compatible = "ti,dra746-pwmss", "ti,am33xx-pwmss";
51 reg = <0x4843e000 0x30>; 51 reg = <0x4843e000 0x30>;
52 ti,hwmods = "epwmss0"; 52 ti,hwmods = "epwmss0";
53 #address-cells = <1>; 53 #address-cells = <1>;
54 #size-cells = <1>; 54 #size-cells = <1>;
55 ranges; 55 ranges;
56 56
57 /* child nodes go here */ 57 /* child nodes go here */
58 }; 58 };
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