Based on kernel version 4.16.1. Page generated on 2018-04-09 11:52 EST.
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, Exynos5250 and Exynos5420 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 - clock-names: should contain all following required clock names: 23 - "timers" - PWM base clock used to generate PWM signals, 24 and any subset of following optional clock names: 25 - "pwm-tclk0" - first external PWM clock source, 26 - "pwm-tclk1" - second external PWM clock source. 27 Note that not all IP variants allow using all external clock sources. 28 Refer to SoC documentation to learn which clock source configurations 29 are available. 30 - clocks: should contain clock specifiers of all clocks, which input names 31 have been specified in clock-names property, in same order. 32 - #pwm-cells: should be 3. See pwm.txt in this directory for a description of 33 the cells format. The only third cell flag supported by this binding is 34 PWM_POLARITY_INVERTED. 35 36 Optional properties: 37 - samsung,pwm-outputs: list of PWM channels used as PWM outputs on particular 38 platform - an array of up to 5 elements being indices of PWM channels 39 (from 0 to 4), the order does not matter. 40 41 Example: 42 pwm@7f006000 { 43 compatible = "samsung,s3c6400-pwm"; 44 reg = <0x7f006000 0x1000>; 45 interrupt-parent = <&vic0>; 46 interrupts = <23>, <24>, <25>, <27>, <28>; 47 clocks = <&clock 67>; 48 clock-names = "timers"; 49 samsung,pwm-outputs = <0>, <1>; 50 #pwm-cells = <3>; 51 }