Tool/software: Linux
hi,
colud you help give a sample?
1. dts config pwm
2. sample pwm driver
thanks
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Tool/software: Linux
hi,
colud you help give a sample?
1. dts config pwm
2. sample pwm driver
thanks
Hi Jack,
can you check this document:
software-dl.ti.com/.../Foundational_Components_Kernel_Drivers.html
also check :
<kernel_dir>/arch/arm/boot/dts/dra7.dtsi
<kernel_dir>/Documentation/pwm.txt
<kernel_dir>/Documentation/devicetree/bindings/pwm/pwm.txt
<kernel_dir>/drivers/pwm/pwm-tiehrpwm.c
Regards,
Yordan
Hi Yordan,
Thanks for your help.
We add enable in dra71-evm.dts
&epwmss0 {
status = "okay";
};
&ehrpwm0 {
status = "okay";
};
&ecap0 {
status = "okay";
};
&epwmss1 {
status = "okay";
};
&ehrpwm1 {
status = "okay";
};
&ecap1 {
status = "okay";
};
And we config in i2c device.
i2c_p3_exp: &i2c5 {
status = "okay";
clock-frequency = <400000>;
ov10633@37 {
compatible = "ovti,ov10633";
reg = <0x37>;
pwms = <&ehrpwm0 0 5000000 1>;
pwm-names = "trigger";
mux-gpios = <&pcf_hdmi 2 GPIO_ACTIVE_HIGH>, /* VIN2_S0 */
<&pcf_hdmi 6 GPIO_ACTIVE_LOW>; /* VIN2_S2 */
port {
onboardLI: endpoint {
remote-endpoint = <&vin2a>;
hsync-active = <1>;
vsync-active = <1>;
pclk-sample = <0>;
};
};
};
.....
But we don't know how binding GPIO and PWM.
Our requirement is using PWM control GPIO output sync signal.
Could you give us some advice?
Thanks
Hi,
This is a generic Linux kernel question on PWM.
You can learn more about PWM API from documentation https://www.kernel.org/doc/Documentation/pwm.txt
You can use the pwm_ (request/free/enable/disable/config/set_polarity) APIs for using the PWM.
Use these APIs in the driver to setup the PWM as required.
You can find more in details at "drivers/pwm/pwm-tiehrpwm.c"
I hope this helps.
Regards,
Nikhil D