Re: [PATCH v2 04/11] leds: aw200xx: calculate dts property display_rows in driver

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Wed, Oct 18, 2023 at 9:30 PM Dmitry Rokosov
<ddrokosov@xxxxxxxxxxxxxxxxx> wrote:
>
> From: George Stark <gnstark@xxxxxxxxxxxxxxxxx>
>
> Get rid of device tree property "awinic,display-rows" and calculate it
> in driver using led definition nodes. display-row actually means number
> of current switches and depends on how leds are connected to the device.

Still the commit message does not answer the question why it's safe
for the users that have this property enabled in their DTBs (note B
letter).

...

> +       device_for_each_child_node(dev, child) {
> +               u32 source;
> +               int ret;
> +
> +               ret = fwnode_property_read_u32(child, "reg", &source);
> +               if (ret || source >= chip->cdef->channels)

Perhaps a warning?

    dev_warn(dev, "Unable to read from %pfw or apply a source channel
number\n", child);

> +                       continue;
> +
> +               max_source = max(max_source, source);
> +       }

...

> +       chip->display_rows = max_source / chip->cdef->display_size_columns + 1;
> +       if (!chip->display_rows) {
> +               dev_err(dev, "No valid led definitions found\n");
> +               return -EINVAL;

So, this part is in ->probe() flow only, correct? If so,
  return dev_err_probe(...);

> +       }

...

> +       if (aw200xx_probe_get_display_rows(dev, chip))
> +               return -EINVAL;

Why is the error code shadowed?

-- 
With Best Regards,
Andy Shevchenko





[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]


  Powered by Linux