Messages in this thread | | | Date | Thu, 15 May 2014 13:30:34 +0200 | From | Bart Tanghe <> | Subject | Re: [rfc]pwm: add xilinx pwm driver |
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On 05/15/2014 12:33 PM, Michal Simek wrote: > On 05/15/2014 10:50 AM, Bart Tanghe wrote: >> On 05/15/2014 09:23 AM, Arnd Bergmann wrote: >>> On Wednesday 14 May 2014 13:26:13 Bart Tanghe wrote: >>>> @@ -0,0 +1,20 @@ >>>> +Xilinx PWM controller >>>> + >>>> +Required properties: >>>> +- compatible: should be "xlnx,pwm-xlnx" >>>> +- add a clock source to the description >>>> + >>>> +Examples: >>>> + >>>> + axi_timer_0: timer@42800000 { >>>> + clock-frequency = <100000000>; >>>> + clocks = <&clkc 15>; >>>> + compatible = "xlnx,xlnx-pwm"; >>>> + reg = <0x42800000 0x10000>; >>>> + xlnx,count-width = <0x20>; >>>> + xlnx,gen0-assert = <0x1>; >>>> + xlnx,gen1-assert = <0x1>; >>>> + xlnx,one-timer-only = <0x0>; >>>> + xlnx,trig0-assert = <0x1>; >>>> + xlnx,trig1-assert = <0x1>; >>>> + } ; >>>> >>> >>> It seems you are missing a mandatory "#pwm-cells" property. >>> How is anybody supposed to use this? >>> >>> Arnd >>> >> >> I've added some additional information in the documentation >> >> >> >> Xilinx PWM controller >> >> This driver works together with the Xilinx Axi timer hardware core. >> The core is available for the microblaze, powerpc and arm based Xilinx >> platforms. >> >> The axi timer core is implemented in the pl (programmable logic) of the >> fpga. The amount is user defined. Each core has two timers and one pwm output. > > For PWM you have to have 2 timers but core itself can be configured > to any configuration and I expect that any output has to be used. > > Can you describe me your testing enviroment with zedboard? > Do you use any additional hw or are using just leds or any device > on zedboard? > > Thanks, > Michal > >
I'm using the 2 internal timers of the axi_timer core. I've attached the pwm output of the timer core to one of the leds. The generate out0 and generate out1 signals aren't attached. I've added 4 axi timers to the design, so I can use the 4 leds of zedboard to visualize and measure the pwm signal.
Regards,
Bart
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