Hi,
I am trying hardly to enable pwm on archlinux-3.8.12-13 on the Beaglebone
black.
I came so far that after exporting the overlay there is a directory at
"/sys/devices/ocp.3/pwm_test_P9_16.15".
Unfortunately there are no files in this directory which would allow me to
modify duty_cycle, period and so on. I only find:
modalias power subsystem uevent
My device tree source overlay is:
/*
* Copyright (C) 2013 CircuitCo
* Copyright (C) 2013 Texas Instruments
*
* Enables PWM through ehrpwm1 on P9_14 and P9_16.
*/
/dts-v1/;
/plugin/;
/ {
part-number = "BB-HONEYMOON";
version = "00A0";
compatible =
"ti,beaglebone",
"ti,beaglebone-black"
;
exclusive-use =
"P9.16",
"ehrpwm1A",
"ehrpwm1B"
;
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
pwm_P9_16: pinmux_pwm_P9_16_pins {
pinctrl-single,pins = <0x04c 0x06>;
};
};
};
fragment@1 {
target = <&ocp>;
__overlay__ {
pwm_test_P9_16 {
status = "okay";
compatible = "pwm_test";
pwm-names = "PWM_P9_16";
pwms = <&ehrpwm1 1 0 1>;
pinctrl-0 = <&pwm_P9_16>;
pinctrl-names = "default";
enabled = <0>;
duty = <0>;
};
};
};
fragment@2 {
target = <&epwmss1>;
__overlay__ {
status = "okay";
};
};
fragment@3 {
target = <&ehrpwm1>;
__overlay__ {
status = "okay";
};
};
};
When I export it through slots in bone_capemgr.* I get following in dmesg:
[ 41.196408] bone-capemgr bone_capemgr.9: slot #7: generic override
[ 41.196425] bone-capemgr bone_capemgr.9: bone: Using override eeprom data at
slot 7
[ 41.196444] bone-capemgr bone_capemgr.9: slot #7: 'Override Board
Name,00A0,Override Manuf,BB-HONEYMOON'
[ 41.196559] bone-capemgr bone_capemgr.9: slot #7: Requesting part
number/version based 'BB-HONEYMOON-00A0.dtbo
[ 41.196577] bone-capemgr bone_capemgr.9: slot #7: Requesting firmware
'BB-HONEYMOON-00A0.dtbo' for board-name 'Override Board Name', version '00A0'
[ 41.196903] bone-capemgr bone_capemgr.9: slot #7: dtbo
'BB-HONEYMOON-00A0.dtbo' loaded; converting to live tree
[ 41.197302] bone-capemgr bone_capemgr.9: slot #7: #2 overlays
[ 41.206273] bone-capemgr bone_capemgr.9: slot #7: Applied #2 overlays.
[ 41.235206] pwm_test pwm_test_P9_16.15: unable to request PWM
[ 41.248481] platform pwm_test_P9_16.15: Driver pwm_test requests probe
deferral
Hope somebody could tell me what I am doing wrong...
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