linux-kernel - Re: [PATCH v4 2/7] dt-bindings: ti-lmu: Modify dt bindings for the LM3697

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Date:   Fri, 26 Oct 2018 10:37:04 +0200
From:   Pavel Machek <pavel@....cz>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc:     Dan Murphy <dmurphy@...com>, Rob Herring <robh@...nel.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-leds@...r.kernel.org, lee.jones@...aro.org, tony@...mide.com
Subject: Re: [PATCH v4 2/7] dt-bindings: ti-lmu: Modify dt bindings for the
 LM3697

Hi!

> > Do you have an opinion on this?
> 
> This is this problem with the Device Tree's scope of responsibility.
> It is defined as a means for "describing the hardware", but often
> this rule is abused by the properties that fall into "configuration"
> category. E.g. default-state, retain-state-suspended from leds-gpio.txt
> or linux-default-trigger from common LED bindings.

"retain-state-suspended" is actually hardware property. On PCs,
(most?) LEDs will go off in suspend. On android phones, LEDs stay on
while suspended.

"linux-default-trigger" is actually kind-of hardware property, too. If
LED has an icon near it (or on it), you want to use that LED in that
meaning.

(Thinkpad X60 has "wifi", "bluetooth", "numlock", "capslock", "hdd",
"power", "battery", "ac" and "sleep" leds. Surely we should use them
in that meaning?)

Now, if someone has leds labeled "user 1..user 4" and uses
"linux-default-trigger" there, that is kind of "more interesting".

"default-state" is similar (subset of "linux-default-trigger"); you
don't want power LED to go off during kernel boot...

								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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