Hi,
I have been able to install kernel 5.4.31 on the board with the support of dfsdm following the wiki and the docs.
I have now two iio devices : dfsdm-adc0 and soc:adc-1
But I can't figure out how to use them and I can't see the clock on pin B13.
Here is the end of stm32mp15c-dk2.dts :
&dfsdm {
pinctrl-names = "default", "sleep";
pinctrl-0 = <&dfsdm_clkout_pins_a &dfsdm_data1_pins_a>; /* default pins */
pinctrl-1 = <&dfsdm_clkout_sleep_pins_a &dfsdm_data1_sleep_pins_a>; /* sleep pins for low-power mode */
spi-max-frequency = <2048000>; /* desired maximum clock rate */
status = "okay";
dfsdm0: filter@0 {
st,adc-channels = <1>; /* Assign channel 1 to this filter */
st,adc-channel-names = "in1"; /* Give it a name */
st,adc-channel-types = "SPI_R"; /* SPI data on rising edge */
st,adc-channel-clk-src = "CLKOUT_F"; /* internal clock source used for conversion */
io-channels = <&sd_adc1>; /* phandle to the external sd-modulator */
st,filter-order = <1>;
status = "okay";
};
};
And stm32mp15-pinctrl.dtsi :
dfsdm_clkout_pins_a: dfsdm-clkout-pins-0 {
pins {
pinmux = <STM32_PINMUX('B', 13, AF3)>; /* DFSDM_CKOUT */
bias-disable;
drive-push-pull;
slew-rate = <0>;
};
};
dfsdm_clkout_sleep_pins_a: dfsdm-clkout-sleep-pins-0 {
pins {
pinmux = <STM32_PINMUX('B', 13, ANALOG)>; /* DFSDM_CKOUT */
};
};
dfsdm_data1_pins_a: dfsdm-data1-pins-0 {
pins {
pinmux = <STM32_PINMUX('C', 3, AF3)>; /* DFSDM_DATA1 */
};
};
dfsdm_data1_sleep_pins_a: dfsdm-data1-sleep-pins-0 {
pins {
pinmux = <STM32_PINMUX('C', 3, ANALOG)>; /* DFSDM_DATA1 */
};
};
What is the best way to start the modulator ? (I understand that it is not started by I might be wrong).
Thanks,
Best regards,
Nicolas
