Hi,
I am using the archlinux 3.12.0-rc7-5 kernel and want to enable the generic
/sys/pwm interface (not the one over /sys/devices/ocp.*).
Unfortunately I do not get it. The kernel documentation gives following snippet:
ehrpwm0: ehrpwm@0 { /* EHRPWM on am33xx */
compatible = "ti,am33xx-ehrpwm";
#pwm-cells = <3>;
reg = <0x48300200 0x100>;
ti,hwmods = "ehrpwm0";
};
Source:
https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/pwm/pwm-tiehrpwm.txt
However adding this to the overlay and exporting via echo BB-PWM-00A0 >
/sys/devices/bone_capemgr.*/slots does not show allow me to export
anything to /sys/pwm/export.
My current overlay is:
/dts-v1/;
/plugin/;
/ {
part-number = "BB-HONEYMOON";
version = "00A0";
compatible =
"ti,beaglebone",
"ti,beaglebone-black"
;
exclusive-use =
"P9.21",
"P9.22",
"P9.29",
"P9.31",
"ehrpwm0A",
"ehrpwm0B"
;
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
pinctrl-single,pins = <
0x154 0x03 /* P9_21 PWM Mode */
0x150 0x03 /* P9_22 PWM Mode */
0x194 0x01 /* P9_29 PWM Mode */
0x190 0x01 /* P9_31 PWM Mode */
> ;
};
};
ehrpwm0: ehrpwm@0 {
compatible = "ti,am33xx-ehrpwm";
#pwm-cells = <3>;
reg = <0x48300200 0x100>;
ti,hwmods = "ehrpwm0";
};
};
Could somebody tell me what I am doing wrong and how a right overlay would look
like?
Best,
Bo--
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