I am trying to use the pin P8_13 for pwm. When I load the overlay I the
power file is created but no duty, period, ... files are created. I am
clearly doing something wrong. I can't use the universal overlay because I
can't figure out how to load a one wire device in the universal overlay.
With the universal overlay the pwm works perfectly.
I am using kernel 3.8.13-bone70
My overlay is as follows:
/ {
compatible = "ti,beaglebone", "ti,beaglebone-black";
/* identification */
part-number = "BREW_PWM_P8_13";
/* state the resources this cape uses */
exclusive-use =
/* the pin header uses */
"P8.13",
/* the hardware IP uses */
"ehrpwm2B";
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
brew_pwm_P8_13: pinmux_brew_pwm_P8_13 {
pinctrl-single,pins = <0x024 0x24>;
};
};
};
fragment@1 {
target = <&ocp>;
__overlay__ {
brewery_pwm_P8_13 {
compatible = "pwm_brew";
pwms = <&ehrpwm2 1 500000 0>;
pwm-names = "PWM_P8_13";
pinctrl-names = "pwm";
pinctrl-0 = <&brew_pwm_P8_13>;
enabled = <1>;
duty = <0>;
status = "okay";
};
};
};
};
when I load the overlay dmesg shows the overlay was accepted
the directory for the pwm pin is created and it has
modalias: a file
power: a directory
subsystem: a link
uevent: a file
I can't find the duty, period, ... files that are needed to control the pwm.
Any guidance would be appreciated.
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