I want to enable input capture functionality on our stm32mp157c based system. I am using Timer 1 channel 4 for the same and have made the necessary additions in the device tree as follows:
&dma1{
status = "okay";
/* USER CODE BEGIN dma1 */
sram = <&dma_pool>;
/* USER CODE END dma1 */
};
&dma2{
status = "okay";
/* USER CODE BEGIN dma2 */
sram = <&dma_pool>;
/* USER CODE END dma2 */
};
&dmamux1{
dma-masters = <&dma1 &dma2>;
dma-channels = <16>;
status = "okay";
/* USER CODE BEGIN dmamux1 */
/* USER CODE END dmamux1 */
};
&timers1{
/* USER CODE BEGIN timers3 */
/* Enable DMA "ch1" for PWM input on TIM1_CH1 */
dmas = <&dmamux1 13 0x400 0x80000001>;
dma-names = "ch3";
status = "okay";
/* USER CODE END timers3 */
pwm {
pinctrl-names = "default", "sleep";
pinctrl-0 = <&tim1_pins_mx>;
pinctrl-1 = <&tim1_sleep_pins_mx>;
status = "okay";
/* USER CODE BEGIN timers1_pwm */
/* USER CODE END timers1_pwm */
};
};
and the gpios are added to pinctrl block
&pinctrl
{
.....
.....
tim1_pins_mx: tim1_mx-0 {
pins {
pinmux = <STM32_PINMUX('E', 14, AF1)>; /* TIM1_CH4 */
bias-disable;
};
};
tim1_sleep_pins_mx: tim1_sleep_mx-0 {
pins {
pinmux = <STM32_PINMUX('E', 14, ANALOG)>; /* TIM1_CH4 */
};
};
}
checking the status in /sys/class/pwm/ shows the device as enabled. However, after running the capture command, No device error is returned
Am I missing something here?
TIA
