Solved
STM32MP157 ADC failing to probe during boot
Greeting.
I'm trying to get our ADC subsystem up and running and getting weird errors in dmesg during boot. I'm assuming I've done something wrong with devicetree but I can't seem to figure out a working combination from the docs.
Full part number of our MPU is STM32MP157CAC3.
During boot we get error -61 during the probe of the two converters as shown below
Thanks,
-LinuxAddict
$ dmesg | grep -E "adc|iio"
[ 2.510869] iio iio:device0: No channels configured
[ 2.514812] stm32-adc: probe of 48003000.adc:adc@0 failed with error -61
[ 2.522467] iio iio:device0: No channels configured
[ 2.526055] stm32-adc: probe of 48003000.adc:adc@100 failed with error -61
Here's our devicetree portions:
&pinctrl {
adc1_pins: adc1-single-ended {
analog-inputs1 {
pinmux = <STM32_PINMUX('C', 0, ANALOG)>,
<STM32_PINMUX('A', 5, ANALOG)>;
bias-disable;
} ;
} ;
};
&adc {
pinctrl-names = "default";
pinctrl-0 = <&adc1_pins>;
status = "okay";
vdda-supply = <&vdd>;
vref-supply = <&v3v3>;
/* ANALOG_IN1 = ADC2_INP0 (pin ANA0) */
/* ANALOG_IN2 = ADC2_INP1 (pin ANA1) */
/* ANALOG_IN3 = ADC1_INP10 (pin PC0) */
/* ANALOG_IN4 = ADC1_INP19 (pin PA5) */
adc1: adc@0 {
status = "okay";
channel@0 {
reg = <0>;
st,min-sample-time-ns = <10000>; /* 10µs sampling time */
label = "ANALOG_IN_1";
};
channel@1 {
reg = <1>;
st,min-sample-time-ns = <10000>; /* 10µs sampling time */
label = "ANALOG_IN_2";
};
};
adc2: adc@100 {
status = "okay";
channel@10 {
reg = <10>;
st,min-sample-time-ns = <10000>; /* 10µs sampling time */
label = "ANALOG_IN_3";
};
channel@19 {
reg = <19>;
st,min-sample-time-ns = <10000>; /* 10µs sampling time */
label = "ANALOG_IN_4";
};
};
};