stm32_pconf_set_bias
ret = stm32_pconf_set_bias(bank, offset, 0);
ret = stm32_pconf_set_bias(bank, offset, 1);
ret = stm32_pconf_set_bias(bank, offset, 2);
ret = stm32_pconf_set_bias(bank, offset, bank->pin_backup[offset].bias);