pwm: Update DT bindings to reference pwm.txt for cells documentation

[deliverable/linux.git] / Documentation / devicetree / bindings / pwm / pwm-samsung.txt

* Samsung PWM timers

Samsung SoCs contain PWM timer blocks which can be used for system clock source
and clock event timers, as well as to drive SoC outputs with PWM signal. Each
PWM timer block provides 5 PWM channels (not all of them can drive physical
outputs - see SoC and board manual).

Be aware that the clocksource driver supports only uniprocessor systems.

Required properties:
- compatible : should be one of following:
    samsung,s3c2410-pwm - for 16-bit timers present on S3C24xx SoCs
    samsung,s3c6400-pwm - for 32-bit timers present on S3C64xx SoCs
    samsung,s5p6440-pwm - for 32-bit timers present on S5P64x0 SoCs
    samsung,s5pc100-pwm - for 32-bit timers present on S5PC100, S5PV210,
			  Exynos4210 rev0 SoCs
    samsung,exynos4210-pwm - for 32-bit timers present on Exynos4210,
                          Exynos4x12 and Exynos5250 SoCs
- reg: base address and size of register area
- interrupts: list of timer interrupts (one interrupt per timer, starting at
  timer 0)
- #pwm-cells: should be 3. See pwm.txt in this directory for a description of
  the cells format. The only third cell flag supported by this binding is
  PWM_POLARITY_INVERTED.

Optional properties:
- samsung,pwm-outputs: list of PWM channels used as PWM outputs on particular
    platform - an array of up to 5 elements being indices of PWM channels
    (from 0 to 4), the order does not matter.

Example:
	pwm@7f006000 {
		compatible = "samsung,s3c6400-pwm";
		reg = <0x7f006000 0x1000>;
		interrupt-parent = <&vic0>;
		interrupts = <23>, <24>, <25>, <27>, <28>;
		samsung,pwm-outputs = <0>, <1>;
		#pwm-cells = <3>;
	}