Have you read this ? https://github.com/beagleboard/bb.org-overlays
What version dtc are you using ? it must be 1.4.1 or greater. On Sun, Aug 23, 2015 at 2:06 PM, M@ Dunlap <[email protected]> wrote: > Hello all, I'm trying with increasing desperation to get my BBB (that is > running 4.1.4-1-ARCH) to use a PWM. It used to work, but then I updated > from 3.8 to 4.1 and now it's back to SNAFU. I'm trying to get device trees > to work, but I really, really don't get device tree overlays, I've read all > the guides/docs and am still clueless. > > My current best guess is to first load > https://github.com/ProjectHexapod/bbbStuff/blob/master/overlays/am33xx_pwm-00A0.dts > to activate pwm, and then load > https://github.com/ProjectHexapod/bbbStuff/blob/master/overlays/thigh_bone-00A0.dts > to configure all the pins. Unfortunately when I do that and then try to > echo something into pwmFolder/duty it tells me that the permission is > denied. I also don't understand why those need to be separate device tree > overlays. > > In attempting to isolate the problem I also came up with the following, > but it gives the same permission denied errors. I'm out of ideas, please > send help! Also, even if you don't know how to solve the problem, I'd also > be interested to hear if there are style or high-level problems with my > approach.... > > /dts-v1/; > /plugin/; > > / { > compatible = "ti,beaglebone", "ti,beaglebone-black"; > > /* identification */ > part-number = "test1"; > version = "00A0"; > exclusive-use = > /* the pin header uses */ > "P8.13", > /* the hardware IP uses */ > "ehrpwm2B"; > > fragment@0 { > target = <&epwmss0>; > __overlay__ { > status = "okay"; > }; > }; > > fragment@1 { > target = <&ehrpwm0>; > __overlay__ { > status = "okay"; > }; > }; > > fragment@2 { > target = <&epwmss1>; > __overlay__ { > status = "okay"; > }; > }; > > fragment@3 { > target = <&ehrpwm1>; > __overlay__ { > status = "okay"; > }; > }; > > fragment@4 { > target = <&epwmss2>; > __overlay__ { > status = "okay"; > }; > }; > > fragment@5 { > target = <&ehrpwm2>; > __overlay__ { > status = "okay"; > }; > }; > > fragment@6 { > target = <&am33xx_pinmux>; > __overlay__ { > bs_pwm_P8_13_0x14: pinmux_bs_pwm_P8_13_0x14 { > pinctrl-single,pins = <0x024 0x14>; > }; > }; > }; > > fragment@7 { > target = <&ocp>; > __overlay__ { > bs_pwm_test_P8_13 { > compatible = "pwm_test"; > pwms = <&ehrpwm2 1 500000 1>; > pwm-names = "PWM_P8_13"; > > pinctrl-names = "default"; > pinctrl-0 = <&bs_pwm_P8_13_0x14>; > > enabled = <1>; > duty = <0>; > status = "okay"; > }; > }; > }; > }; > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
