(OSD3358) analog inputs

Embedded Linux Discussions
1

Hi,
Custom board using Octavo OSD3358-base. I am connecting analog inputs AIN0, AIN1, AIN2, AIN3 and VREFN (VREFN_ADC). I understand I need to enable the ADC driver in the kernel. I am using an exact copy of am33xx.dtsi and a edited copy of am335x-bone-common.dtsi from BeagleBoard-DeviceTrees-4.19.x-ti.

What needs added to the device tree to enable the analog inputs?

Thank you,

2

Hi all,
This link answered my questions.

I added this to my common.dtsi file.

&tscadc {
	status = "okay";
	adc {
		ti,adc-channels = <0 1 2 3 4 5 6 7>;
		//ti,chan-step-avg = <16 16 16 16 16 16 16 16>;
		//ti,chan-step-opendelay = <0x98 0x98 0x98 0x98 0x98 0x98 0x98 0x98>;
		//ti,chan-step-sampledelay = <0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0>;
	};
};

After adding &tscadc{} and booting with the new .dtb file then the iio:device0 folder showed up in the /sys/bus/iio/devices folder.

Thank you,
(you can mark this as resolved)

3

@jakthree that’s correct, you can simply if to:

&tscadc {
	status = "okay";
	adc {
		ti,adc-channels = <0 1 2 3>;
	};
};

Regards,