linux-kernel - Re: [PATCH v3 04/11] leds: aw200xx: calculate dts property display

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Message-ID: <CAHp75VcZ9JN2Ah3z8fDwdFNzts330Dccs0UYUx07KZ8_dV4aaQ@mail.gmail.com>
Date:   Sat, 18 Nov 2023 18:46:45 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Dmitry Rokosov <ddrokosov@...utedevices.com>
Cc:     lee@...nel.org, pavel@....cz, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        kernel@...rdevices.ru, rockosov@...il.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-leds@...r.kernel.org,
        George Stark <gnstark@...utedevices.com>
Subject: Re: [PATCH v3 04/11] leds: aw200xx: calculate dts property
 display_rows in the driver

On Wed, Nov 1, 2023 at 4:24 PM Dmitry Rokosov
<ddrokosov@...utedevices.com> wrote:
>
> From: George Stark <gnstark@...utedevices.com>
>
> Get rid of device tree property "awinic,display-rows". The property
> value actually means number of current switches and depends on how leds
> are connected to the device. It should be calculated manually by max
> used led number. In the same way it is computed automatically now.
> Max used led is taken from led definition subnodes.

...

> +static bool aw200xx_probe_get_display_rows(struct device *dev, struct aw200xx *chip)
> +{
> +       struct fwnode_handle *child;
> +       u32 max_source = 0;
> +
> +       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)
> +                       continue;
> +
> +               max_source = max(max_source, source);
> +       }

> +       chip->display_rows = max_source / chip->cdef->display_size_columns + 1;
> +       return !!chip->display_rows;

This is a bit weird. Can we rewrite it as

  if (max_source == 0)
    return false;

  ->display_rows = ...
  return true;

?

> +}


-- 
With Best Regards,
Andy Shevchenko