> +static int gpio_aggregator_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct gpio_desc **descs;
> + struct gpiochip_fwd *fwd;
> + int i, n;
> +
> + n = gpiod_count(dev, NULL);
> + if (n < 0)
> + return n;
> +
> + descs = devm_kmalloc_array(dev, n, sizeof(*descs), GFP_KERNEL);
> + if (!descs)
> + return -ENOMEM;
> +
> + for (i = 0; i < n; i++) {
> + descs[i] = devm_gpiod_get_index(dev, NULL, i, GPIOD_ASIS);
can you please add this check as well as we need to return EPROBE_DEFER.
if (desc[i] == ERR_PTR(-ENOENT))
< return -EPROBE_DEFER;
> + if (IS_ERR(descs[i]))
> + return PTR_ERR(descs[i]);
> + }
> +
> + fwd = gpiochip_fwd_create(dev, n, descs);
> + if (IS_ERR(fwd))
> + return PTR_ERR(fwd);
> +
> + platform_set_drvdata(pdev, fwd);
> + return 0;
> +}
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id gpio_aggregator_dt_ids[] = {
> + { .compatible = "gpio-repeater" },
> + /*
> + * Add GPIO-operated devices controlled from userspace below,
> + * or use "driver_override" in sysfs
> + */
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, gpio_aggregator_dt_ids);
> +#endif
> +
> +static struct platform_driver gpio_aggregator_driver = {
> + .probe = gpio_aggregator_probe,
> + .driver = {
> + .name = DRV_NAME,
> + .groups = gpio_aggregator_groups,
> + .of_match_table = of_match_ptr(gpio_aggregator_dt_ids),
> + },
> +};
> +
> +static int __init gpio_aggregator_init(void)
> +{
> + return platform_driver_register(&gpio_aggregator_driver);
> +}
> +module_init(gpio_aggregator_init);
> +
> +static void __exit gpio_aggregator_exit(void)
> +{
> + gpio_aggregator_remove_all();
> + platform_driver_unregister(&gpio_aggregator_driver);
> +}
> +module_exit(gpio_aggregator_exit);
> +
> +MODULE_AUTHOR("Geert Uytterhoeven <geert+rene...@glider.be>");
> +MODULE_DESCRIPTION("GPIO Aggregator/Repeater");
> +MODULE_LICENSE("GPL v2");
