On Mon, Feb 8, 2021 at 11:24 PM Enrico Weigelt, metux IT consult
[off-list ref] wrote:

Add support for probing via device tree.

(...)

+       pdata->gpio_num = of_property_count_elems_of_size(dev->of_node,
+                                                         "gpio-regs",
+                                                         sizeof(u32));
+       pdata->gpio_reg = devm_kzalloc(dev, sizeof(int)*pdata->gpio_num,
+                                      GFP_KERNEL);
+       if (!pdata->gpio_reg)
+               goto nomem;

I don't know what the idea is with this but register are not normally defined
in the DTS files. The registers are determined from the compatible value.

+       pdata->gpio_names = devm_kzalloc(dev, sizeof(char*)*pdata->gpio_num,
+                                        GFP_KERNEL);
+       if (!pdata->gpio_names)
+               goto nomem;

(...)

+       ret = of_property_read_string_array(dev->of_node, "gpio-line-names",
+                                           pdata->gpio_names, pdata->gpio_num);

And this is already handled by the core.

Yours,
Linus Walleij