linux-kernel - Re: [PATCH] ARM: dts: imx53: ppd: alarm LEDs use kernel LED interface

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Message-ID: <20200529160204.GA6025@duo.ucw.cz>
Date:   Fri, 29 May 2020 18:02:04 +0200
From:   Pavel Machek <pavel@....cz>
To:     Sebastian Reichel <sebastian.reichel@...labora.com>
Cc:     Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...labora.com,
        Ian Ray <ian.ray@...com>, Samu Nuutamo <samu.nuutamo@...cit.fi>
Subject: Re: [PATCH] ARM: dts: imx53: ppd: alarm LEDs use kernel LED interface

Hi!

> ping?

Well, I thought that we maybe do not need standard LEDs on medical hardware.

> On Fri, Apr 24, 2020 at 02:44:23PM +0200, Sebastian Reichel wrote:
> > Hi,
> > 
> > On Fri, Apr 24, 2020 at 11:32:26AM +0200, Pavel Machek wrote:
> > > On Thu 2020-04-16 16:51:23, Sebastian Reichel wrote:
> > > > From: Ian Ray <ian.ray@...com>
> > > > 
> > > > Use kernel LED interface for the alarm LEDs.
> > > 
> > > Could we get these changes cced to LED maintainers?
> > 
> > Sorry, you are not turning up via get_maintainer.pl and usually
> > subsystem maintainers are not CC'd for every DT device instance.
> > E.g. I do not want to be always CC'd for DT board file containing
> > a battery/charger. I'm quite surprised you want to be CC'd for
> > them, just looking at ARM DT files there are over 1000 instances
> > of leds.

Well, we have mess in the naming; I'd like to clear it up.

> > > > +		alarm1 {
> > > > +			label = "alarm:red";
> > > > +			gpios = <&gpio7 3 GPIO_ACTIVE_HIGH>;
> > > > +		};
> > > 
> > > So... What is function of these leds, and can we get naming more
> > > consistent with rest of the kernel?
> > 
> > The device is a medical patient monitor and these are alarm LEDs
> > informing about critical device or patient status. They are
> > referenced by their color (those are discrete LEDs, not a
> > multi-color one) basically everywhere. The only exception is
> > "silenced", which means that audible alarm is surpressed. I
> > don't think we have something comparable for any of those LEDs
> > in the mainline tree.

Actually, we have "platform:*:mute" LEDs, that could be used for
"silenced".

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

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