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Detect gpiochip via libgpiod for H616 #989

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Detect gpiochip via libgpiod for H616 #989

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Detect gpiochip via libgpiod for H616
mlodedrwale Jul 5, 2025
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style: autoformat with black
mlodedrwale Jul 6, 2025
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21 changes: 15 additions & 6 deletions src/adafruit_blinka/microcontroller/allwinner/h616/pin.py
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Original file line number Diff line number Diff line change
@@ -1,15 +1,24 @@
# SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
#
# SPDX-License-Identifier: MIT

"""Allwinner H616 Pin Names"""
import glob
import gpiod
from adafruit_blinka.microcontroller.generic_linux.libgpiod_pin import Pin

__chip_num = 1
with open("/sys/class/gpio/gpiochip0/label", "r") as f:
label = f.read().strip()
if label == "300b000.pinctrl":
__chip_num = 0

def find_gpiochip_number(target_label):
"""Return the GPIO chip number for the target label, or 0 if not found."""
for dev in glob.glob("/dev/gpiochip*"):
with gpiod.Chip(dev) as chip:
info = chip.get_info()
if info.label == target_label:
return int(dev[-1])
return 0


__chip_num = find_gpiochip_number("300b000.pinctrl")

PC0 = Pin((__chip_num, 64))
SPI0_SCLK = PC0
PC1 = Pin((__chip_num, 65))
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