linux-kernel - Re: [RESEND PATCH v6 6/6] leds: Add a multicolor LED driver to group monochromatic LEDs

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Date:   Wed, 28 Dec 2022 02:41:44 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Cc:     lee@...nel.org, pavel@....cz, robh+dt@...nel.org,
        sven.schwermer@...ruptive-technologies.com,
        krzysztof.kozlowski+dt@...aro.org, johan+linaro@...nel.org,
        marijn.suijten@...ainline.org, bjorn.andersson@...aro.org,
        jacek.anaszewski@...il.com, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH v6 6/6] leds: Add a multicolor LED driver to group
 monochromatic LEDs

On Tue, Dec 27, 2022 at 12:07 PM Jean-Jacques Hiblot
<jjhiblot@...phandler.com> wrote:
>
> By allowing to group multiple monochrome LED into multicolor LEDs,
> all involved LEDs can be controlled in-sync. This enables using effects
> using triggers, etc.

...

> +       count = 0;
> +       max_brightness = 0;
> +       for (;;) {
> +               struct led_classdev *led_cdev;
> +
> +               led_cdev = devm_of_led_get_optional(dev, count);

> +

Redundant blank line.

> +               if (IS_ERR(led_cdev))
> +                       return dev_err_probe(dev, PTR_ERR(led_cdev),
> +                                            "Unable to get led #%d", count);
> +
> +               /* Reached the end of the list ?*/
> +               if (!led_cdev)
> +                       break;

> +               count++;

If I understand the flow correctly, this can be moved...

> +               priv->monochromatics = devm_krealloc_array(dev, priv->monochromatics,
> +                                       count, sizeof(*priv->monochromatics),
> +                                       GFP_KERNEL);
> +               if (!priv->monochromatics)
> +                       return -ENOMEM;

> +               priv->monochromatics[count - 1] = led_cdev;

...here either as a separate line or a part of the above assignment,
in either case the -1 wouldn't be needed.


> +               max_brightness = max(max_brightness, led_cdev->max_brightness);
> +       }

-- 
With Best Regards,
Andy Shevchenko