From: Sebastian Reichel <sre@kernel.org>
To: Pavel Machek <pavel@ucw.cz>
Cc: pali.rohar@gmail.com, kernel list <linux-kernel@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
linux-omap@vger.kernel.org, tony@atomide.com, khilman@kernel.org,
aaro.koskinen@iki.fi, ivo.g.dimitrov.75@gmail.com,
patrikbachan@gmail.com, serge@hallyn.com
Subject: Re: 3-color led too bright
Date: Sun, 31 Jan 2016 01:24:07 +0100 [thread overview]
Message-ID: <20160131002406.GA21238@earth> (raw)
In-Reply-To: <20160130200750.GB30429@amd>
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Hi Pavel,
On Sat, Jan 30, 2016 at 09:07:50PM +0100, Pavel Machek wrote:
> The indicator 3-color LED in mainline kernel seem to be a bit too
> bright. .. more bright to look at comfortably. I believe it is also
> brighter than in original maemo... I believe I've seen note somewhere
> that hardware may allow too much current to the 3-color led damaging
> hardware... but I can't find the link now.
Safe current limits for the leds are configured in the DTS
(led-cur and max-cur) and can be checked in sysfs. I remember
testing the safety limits when I added them to DT, but the
driver has changed a bit since then.
-- Sebastian
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From: sre@kernel.org (Sebastian Reichel)
To: linux-arm-kernel@lists.infradead.org
Subject: 3-color led too bright
Date: Sun, 31 Jan 2016 01:24:07 +0100 [thread overview]
Message-ID: <20160131002406.GA21238@earth> (raw)
In-Reply-To: <20160130200750.GB30429@amd>
Hi Pavel,
On Sat, Jan 30, 2016 at 09:07:50PM +0100, Pavel Machek wrote:
> The indicator 3-color LED in mainline kernel seem to be a bit too
> bright. .. more bright to look at comfortably. I believe it is also
> brighter than in original maemo... I believe I've seen note somewhere
> that hardware may allow too much current to the 3-color led damaging
> hardware... but I can't find the link now.
Safe current limits for the leds are configured in the DTS
(led-cur and max-cur) and can be checked in sysfs. I remember
testing the safety limits when I added them to DT, but the
driver has changed a bit since then.
-- Sebastian
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next prev parent reply other threads:[~2016-01-31 0:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-30 20:07 3-color led too bright Pavel Machek
2016-01-30 20:07 ` Pavel Machek
2016-01-31 0:24 ` Sebastian Reichel [this message]
2016-01-31 0:24 ` Sebastian Reichel
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