| Tomasz Figa | 5b5ff97 | 2013-04-23 17:46:22 +0200 | [diff] [blame] | 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 | } |