Phytec i.MX 93 - Adc; Leds; I²C Bus

i.MX 93 BSP Manual PD24.1.1 Documentation Rev.: imx8mp-pd22.1.2-51-ga548be7d
7.6 ADC
The PHYTEC i.MX 93 include general purpose Analog-to-Digital Converters (ADC) which can be used for
interfacing analog sensors.
Reading the ADC values can be done through sysfs:
target:~$ cat /sys/bus/iio/devices/iio:deviceX/in_voltageY_raw
On phyBOARD-Nash the ADC lines are accessible on X16 expansion connector:
ADC input X16 pin
ADC_IN0 47
ADC_IN2 49
7.7 LEDs
If any LEDs are connected to GPIOs, you have the possibility to access them by a special LED driver interface
instead of the general GPIO interface (section GPIOs). You will then access them using /sys/class/leds/
instead of /sys/class/gpio/. The maximum brightness of the LEDs can be read from the max_brightness
le. The brightness le will set the brightness of the LED (taking a value from 0 up to max_brightness).
Most LEDs do not have hardware brightness support and will just be turned on by all non-zero brightness
settings.
Below is a simple example.
To get all available LEDs, type:
target:~$ ls /sys/class/leds
green:heartbeat@ mmc0::@ mmc1::@ yellow:@
Here the LEDs green:heartbeat is on the phyCORE-i.MX93. If you are using phyBOARD-Segin there is
also yellow LED which is populated on the PEB-EVAL-01.
• To toggle the LEDs ON:
target:~$ echo 1 > /sys/class/leds/green\:heartbeat/brightness
• To toggle OFF:
target:~$ echo 0 > /sys/class/leds/green\:heartbeat/brightness
Device tree conguration for the User I/O conguration can be found here: https://git.phytec.de/linux-imx/
tree/arch/arm64/boot/dts/freescale/imx93-phyboard-segin-peb-eval-01.dtso?h=v6.1.55_2.2.0-phy3#n33
7.8 I²C Bus
The i.MX 93 contains several Multimaster fast-mode I²C modules. PHYTEC boards provide plenty of
dierent I²C devices connected to the I²C modules of the i.MX 93. This section describes the basic device
usage and its DT representation of some I²C devices integrated into our phyBOARD-Segin/Nash i.MX 93.
The device tree node for i2c contains settings such as clock-frequency to set the bus frequency and the pin
control settings including scl-gpios and sda-gpios which are alternate pin congurations used for bus recovery.
Accessing Peripherals 59