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function find_gpio_leds_dt ()
{
for NEXT in $(find -L /proc/device-tree -name "compatible" | sort);
do
cat ${NEXT} | grep -xz "gpio-leds" > /dev/null && {
LEDS_DIRNAME="$(dirname ${NEXT})";
LEDS_COMPATIBLE="$(cat ${LEDS_DIRNAME}/compatible)";
echo "${LEDS_DIRNAME}";
echo -e "\tcompatible = '${LEDS_COMPATIBLE}'";
for NEXT_LED in $(find -L "${LEDS_DIRNAME}" -name "gpios" | sort);
do
NEXT_LED_DIR="$(dirname ${NEXT_LED})";
echo "${NEXT_LED_DIR}";
LEDS_GPIOS="$(hexdump -v -e '"0x" 4/1 "%02x" " "' "${NEXT_LED}")";
CONTROLLER_PHANDLE_HEX=$(echo ${LEDS_GPIOS} | cut -d ' ' -f 1);
GPIO_BIT_HEX=$(echo ${LEDS_GPIOS} | cut -d ' ' -f 2);
INVERTED_FLAG_HEX=$(echo ${LEDS_GPIOS} | cut -d ' ' -f 3);
printf " gpios = ('%d', '%d', '%d') : ('%s', '%s', '%s')\n" "${CONTROLLER_PHANDLE_HEX}" "${GPIO_BIT_HEX}" "${INVERTED_FLAG_HEX}" "controller" "bit" "flag";
GPIO_CONTROLLER="unknown";
CONTROLLER_PHANDLE_DEC="$(printf "%d" "${CONTROLLER_PHANDLE_HEX}")";
for NEXT in $(find -L /proc/device-tree -name "phandle" | sort);
do
PHANDLE_HEX="$(hexdump -v -e '"0x" 4/1 "%02x"' "${NEXT}")";
PHANDLE_DEC="$(printf "%d" "${PHANDLE_HEX}")";
[ "${PHANDLE_DEC}" -eq "${CONTROLLER_PHANDLE_DEC}" ] && {
GPIO_CONTROLLER="$(dirname ${NEXT})"
};
done;
printf " controller = '%s'\n" "${GPIO_CONTROLLER}";
done
};
done
}
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