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Add some pinout support for Radxa Zero PWM #868

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makermelissa merged 2 commits into adafruit:main from 708yamaguchi:radxa-pwm

Jul 10, 2024

Contributor

708yamaguchi commented Jul 6, 2024

I add some pinout support for Radxa Zero PWM.

Below I share how I found the mapping between PWM chip and GPIO numbers.

Check mapping between device file and GPIO number

$ sudo cat /sys/kernel/debug/pinctrl/ff800000.sys-ctrl:pinctrl@14-pinctrl-meson/pinmux-pins | grep pwm
pin 11 (GPIOAO_11): ff807000.pwm (GPIO UNCLAIMED) function pwm_ao_a group pwm_ao_a

Find out the chip number corresponding to the device file

In [1]: from adafruit_blinka.microcontroller.alias import get_pwm_chipid

In [2]: get_pwm_chipid("ff807000.pwm")
Out[2]: 'PWM2'

In [3]: int(get_pwm_chipid("ff807000.pwm")[-1])
Out[3]: 2

Add pinout mapping to pin.py

pwmOuts = (
    ((2, 0), GPIOAO_11),  # ((chip, channel), GPIO)
)

708yamaguchi added 2 commits

July 6, 2024 23:14


          Add some pinout support for Radxa Zero PWM

08a1cd7


          Reformat code based on pre-commit

makermelissa approved these changes

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makermelissa left a comment

Looks good. Seems well reasoned to me. Thanks for sharing how you found it.

makermelissa merged commit 0a41814 into adafruit:main

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