linux-kernel - Re: [PATCH v2 3/3] backlight: lm3630a: add device tree supprt

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Message-ID: <20190402000217.GA8315@basecamp>
Date:   Mon, 1 Apr 2019 20:02:17 -0400
From:   Brian Masney <masneyb@...tation.org>
To:     Pavel Machek <pavel@....cz>
Cc:     lee.jones@...aro.org, daniel.thompson@...aro.org,
        jingoohan1@...il.com, robh+dt@...nel.org,
        jacek.anaszewski@...il.com, mark.rutland@....com,
        b.zolnierkie@...sung.com, dri-devel@...ts.freedesktop.org,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org,
        dmurphy@...com, jonathan@...ek.ca
Subject: Re: [PATCH v2 3/3] backlight: lm3630a: add device tree supprt

On Mon, Apr 01, 2019 at 11:48:47PM +0200, Pavel Machek wrote:
> So ... we can have multiple LEDs, each can have up to two
> sources.. and the settings are really per source, not per LED.
> 
> But you do not test for overlaps. What prevents me from having
> 
>    foo {
>        led_sources = <0>;
>        ti,linear-mapping-mode;
>    }
>    bar {
>        led_sources = <0>;
>    }
> 
> (I.e. conflicting settings for a source?)

In this case, it will go with the settings for 'bar'. I didn't check for
the conflicting settings since I was going for consistency with the
other two backlight drivers that already have the led-sources property:
arcxcnn_bl.c and sky81452-backlight.c. I can add the additional check
to fail if a source has already been encountered.

> Plus I do not see parsing of led labels etc...

OK... I can fix that up plus your other two comments.

Thanks,

Brian