Dump Palmetto GPIO hog devicetree nodes

palmetto-gpios.py

#!/usr/bin/python3

import sys

from collections import namedtuple

GpioRegsetConfig = namedtuple("GpioRegsetConfig", "banks value direction")
banks = ( "ABCD", "EFGH" )

broken = (
        GpioRegsetConfig(banks[0], 0x130F8CE3, 0x01706074),
        GpioRegsetConfig(banks[1], 0x9F48F7FF, 0x00004002)
)

working = (
        GpioRegsetConfig(banks[0], 0x130F8CE3, 0x0370E677),
        GpioRegsetConfig(banks[1], 0x0370E677, 0xC738F202)
)

GpioConfig = namedtuple("GpioConfig", "bank index direction state active")

def gpio_dt(name, config):
    fmt = "pin_gpio_{} {{\n\tgpio-hog;\n\tgpios = <ASPEED_GPIO({}, {}) {}>;\n\t{};\n\tline-name = \"{}\";\n}};"
    if "output" == config.direction:
        state = "{}-{}".format(config.direction, config.state)
    else:
        state = config.direction
    return fmt.format(
        name.lower(),
        config.bank,
        config.index,
        "GPIO_ACTIVE_HIGH",
        state,
        name)


def tell_gpios(config, change):
    for i, bank in enumerate(config.banks):
        for j in range(0, 8):
            bi = i * 8 + j;
            if ((1 << bi) & change) > 0:
                gpio = "{}{}".format(bank, j)
                if (bi & config.direction) > 0:
                    sd = "output"
                    value = "high" if (bi & config.value) > 0 else "low"
                else:
                    sd = "input"
                    value = None
                dtconfig = GpioConfig(bank, j, sd, value, "GPIO_ACTIVE_HIGH")
                print(gpio_dt(gpio, dtconfig))
                print()

def main():
    for b, w in zip(broken, working):
        cd = b.direction ^ w.direction
        tell_gpios(w, cd)

if __name__ == "__main__":
    main()