Hi All,
I am suffering a PWM problem and still can not get my excepted 'PWM' waveform.
To follow with device tree customization, I want to achieve PWM functionality to some pins. I have chosen RGMII2_TD3 (pwm5_out) and RGMII2_TD2(pwm6_out). According to 'imx6solox-pinfunc.h' they can be used as pwm5 and pwm6, which are 'MX6SX_PAD_RGMII2_TD3__PWM5_OUT' and 'MX6SX_PAD_RGMII2_TD2__PWM6_OUT' .
1) for my 'imx6sx-sdb.dts' files, I added my code below:
&pwm5 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_pwm5>;
status = "okay";
};
&pwm6 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_pwm6>;
status = "okay";
};
pinctrl_pwm5: pwm5grp {
fsl,pins = <
MX6SX_PAD_RGMII2_TD3__PWM5_OUT 0x110b0
>;
};
pinctrl_pwm6: pwm6grp {
fsl,pins = <
MX6SX_PAD_RGMII2_TD2__PWM6_OUT 0x110b0
>;
};
And then, I configure pwm5 and pwm6 at command line as fellow:
$echo 0 > /sys/class/pwm/pwmchip4/export
it creates pwm0 folder and I try to set the period (1 ms)
$echo 1000000 > /sys/class/pwm/pwmchip4/pwm0/period
$echo 500000 > /sys/class/pwm/pwmchip4/pwm0/duty_cycle
$echo 1 > /sys/class/pwm/pwmchip4/pwm0/enable
$echo 0 > /sys/class/pwm/pwmchip5/export
it creates pwm0 folder and I try to set the period (1 ms)
$echo 1000000 > /sys/class/pwm/pwmchip5/pwm0/period
$echo 500000 > /sys/class/pwm/pwmchip5/pwm0/duty_cycle
$echo 1 > /sys/class/pwm/pwmchip5/pwm0/enable
After that, I command '$cat /sys/kernel/debug/pwm', the following display, Hovever, I still can not get my expected PWM waveform which I have registered.
Could you tell me how to do that in further, many thanks.
Regards
Wei
