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[~andy/linux] / Documentation / devicetree / bindings / pwm / pwm-tiehrpwm.txt
1 TI SOC EHRPWM based PWM controller
2
3 Required properties:
4 - compatible: Must be "ti,<soc>-ehrpwm".
5   for am33xx - compatible = "ti,am33xx-ehrpwm";
6   for da850  - compatible = "ti,da850-ehrpwm", "ti,am33xx-ehrpwm";
7 - #pwm-cells: Should be 3. Number of cells being used to specify PWM property.
8   First cell specifies the per-chip index of the PWM to use, the second
9   cell is the period in nanoseconds and bit 0 in the third cell is used to
10   encode the polarity of PWM output. Set bit 0 of the third in PWM specifier
11   to 1 for inverse polarity & set to 0 for normal polarity.
12 - reg: physical base address and size of the registers map.
13
14 Optional properties:
15 - ti,hwmods: Name of the hwmod associated to the EHRPWM:
16   "ehrpwm<x>", <x> being the 0-based instance number from the HW spec
17
18 Example:
19
20 ehrpwm0: ehrpwm@0 { /* EHRPWM on am33xx */
21         compatible = "ti,am33xx-ehrpwm";
22         #pwm-cells = <3>;
23         reg = <0x48300200 0x100>;
24         ti,hwmods = "ehrpwm0";
25 };
26
27 ehrpwm0: ehrpwm@0 { /* EHRPWM on da850 */
28         compatible = "ti,da850-ehrpwm", "ti,am33xx-ehrpwm";
29         #pwm-cells = <3>;
30         reg = <0x300000 0x2000>;
31 };