linux-kernel - Re: [PATCH v2 18/18] auxdisplay: ht16k33: Add segment display LED support

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Date:   Fri, 25 Jun 2021 22:39:16 +0200
From:   Marek Behun <marek.behun@....cz>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Robin van der Gracht <robin@...tonic.nl>,
        Rob Herring <robh+dt@...nel.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Paul Burton <paulburton@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Pavel Machek <pavel@....cz>, devicetree@...r.kernel.org,
        linux-leds@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 18/18] auxdisplay: ht16k33: Add segment display LED
 support

On Fri, 25 Jun 2021 14:59:02 +0200
Geert Uytterhoeven <geert@...ux-m68k.org> wrote:

> Instantiate a single LED for a segment display.  This allows the user to
> control display brightness and blinking through the LED class API and
> triggers, and exposes the display color.
> The LED will be named "auxdisplay:<color>:backlight".

What if there are multiple "auxdisplay"s ?
Doesn't this subsystem have IDs? So that you can use auxdisplayN for
device name, for example?


> +	of_property_read_u32(node, "color", &color);
> +	seg->led.name = devm_kasprintf(dev, GFP_KERNEL,
> +			"auxdisplay:%s:" LED_FUNCTION_BACKLIGHT,
> +			color < LED_COLOR_ID_MAX ? led_colors[color] : "");

If you use devm_led_classdev_register_ext and pass struct
led_init_data, LED core will generate name of the LED itself.

Marek