ADC Support for STM32U575

[vibhor-meshram]

Is your feature request related to a problem? Please describe. I need to use ADC for my project. I am using nucleo_u575zi_q board. I am using samples/drivers/adc example. I looked into PR #39202 where ADC support is provided for STM32U585 board. I made necessary changes to my dts files for ADC to work. The ADC sample code is now compiling and running as well. I have configured pc0 as adc pin. But the output I am getting is floating values irrespective of what I connect at ADC input(VCC/GND).

Results `ADC reading:

• ADC_1, channel 1: 296 = 59 mV ADC reading:
• ADC_1, channel 1: 292 = 58 mV ADC reading:
• ADC_1, channel 1: 295 = 59 mV ADC reading:
• ADC_1, channel 1: 293 = 59 mV ADC reading:
• ADC_1, channel 1: 293 = 59 mV ADC reading:
• ADC_1, channel 1: 302 = 60 mV ADC reading:
• ADC_1, channel 1: 301 = 60 mV ADC reading:
• ADC_1, channel 1: 244 = 49 mV ADC reading:
• ADC_1, channel 1: 300 = 60 mV ADC reading:
• ADC_1, channel 1: 296 = 59 mV ADC reading:
• ADC_1, channel 1: 296 = 59 mV ADC reading:
• ADC_1, channel 1: 298 = 60 mV`

Describe the solution you'd like The output of ADC must change as per the input.

Describe alternatives you've considered Added adc node to dts file by referring to STM32U585 board. Is there anything else needed to be done?

Additional context Attached: DTS file, overlay file nucleo_u575zi_q_DTS_File.txt nucleo_u575zi_q_overlay_file.txt .

[erwango]

I had a test on b_u585i_iot02a and I'm seeing same behavior. Converting to bug

[FRASTM]

@vibhor-meshram could you please check with the https://github.com/zephyrproject-rtos/zephyr/pull/48770

[vibhor-meshram]

ADC works using above fix.