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1 | * Samsung PWM timers | ||
2 | |||
3 | Samsung SoCs contain PWM timer blocks which can be used for system clock source | ||
4 | and clock event timers, as well as to drive SoC outputs with PWM signal. Each | ||
5 | PWM timer block provides 5 PWM channels (not all of them can drive physical | ||
6 | outputs - see SoC and board manual). | ||
7 | |||
8 | Be aware that the clocksource driver supports only uniprocessor systems. | ||
9 | |||
10 | Required properties: | ||
11 | - compatible : should be one of following: | ||
12 | samsung,s3c2410-pwm - for 16-bit timers present on S3C24xx SoCs | ||
13 | samsung,s3c6400-pwm - for 32-bit timers present on S3C64xx SoCs | ||
14 | samsung,s5p6440-pwm - for 32-bit timers present on S5P64x0 SoCs | ||
15 | samsung,s5pc100-pwm - for 32-bit timers present on S5PC100, S5PV210, | ||
16 | Exynos4210 rev0 SoCs | ||
17 | samsung,exynos4210-pwm - for 32-bit timers present on Exynos4210, | ||
18 | Exynos4x12 and Exynos5250 SoCs | ||
19 | - reg: base address and size of register area | ||
20 | - interrupts: list of timer interrupts (one interrupt per timer, starting at | ||
21 | timer 0) | ||
22 | - #pwm-cells: number of cells used for PWM specifier - must be 3 | ||
23 | the specifier format is as follows: | ||
24 | - phandle to PWM controller node | ||
25 | - index of PWM channel (from 0 to 4) | ||
26 | - PWM signal period in nanoseconds | ||
27 | - bitmask of optional PWM flags: | ||
28 | 0x1 - invert PWM signal | ||
29 | |||
30 | Optional properties: | ||
31 | - samsung,pwm-outputs: list of PWM channels used as PWM outputs on particular | ||
32 | platform - an array of up to 5 elements being indices of PWM channels | ||
33 | (from 0 to 4), the order does not matter. | ||
34 | |||
35 | Example: | ||
36 | pwm@7f006000 { | ||
37 | compatible = "samsung,s3c6400-pwm"; | ||
38 | reg = <0x7f006000 0x1000>; | ||
39 | interrupt-parent = <&vic0>; | ||
40 | interrupts = <23>, <24>, <25>, <27>, <28>; | ||
41 | samsung,pwm-outputs = <0>, <1>; | ||
42 | #pwm-cells = <3>; | ||
43 | } | ||