From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <josh@joshtriplett.org>
Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org
	[172.17.192.35])
	by mail.linuxfoundation.org (Postfix) with ESMTPS id 9C43B4A5
	for <ksummit-discuss@lists.linuxfoundation.org>;
	Thu, 23 Jul 2015 21:00:25 +0000 (UTC)
Received: from relay4-d.mail.gandi.net (relay4-d.mail.gandi.net
	[217.70.183.196])
	by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 39D3F207
	for <ksummit-discuss@lists.linuxfoundation.org>;
	Thu, 23 Jul 2015 21:00:25 +0000 (UTC)
Date: Thu, 23 Jul 2015 14:00:18 -0700
From: josh@joshtriplett.org
To: Pavel Machek <pavel@ucw.cz>
Message-ID: <20150723210018.GA2077@cloud>
References: <20150723105726.GC30929@amd>
	<CACRpkdbCbhgJHZifouDVUvaxyT5YWWdQz7Nt3AKoLvuEn4z7mQ@mail.gmail.com>
	<20150723121441.GB29747@amd>
	<20150723084251.54da2be0@gandalf.local.home>
	<20150723202901.GA30318@amd>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20150723202901.GA30318@amd>
Cc: "ksummit-discuss@lists.linuxfoundation.org"
	<ksummit-discuss@lists.linuxfoundation.org>,
	riverful.kim@samsung.com, kyungmin.park@samsung.com,
	John Stultz <john.stultz@linaro.org>,
	Bjorn Andersson <Bjorn.Andersson@sonymobile.com>
Subject: Re: [Ksummit-discuss] [CORE TOPIC] Mainline kernel on a cellphone
List-Id: <ksummit-discuss.lists.linuxfoundation.org>
List-Unsubscribe: <https://lists.linuxfoundation.org/mailman/options/ksummit-discuss>,
	<mailto:ksummit-discuss-request@lists.linuxfoundation.org?subject=unsubscribe>
List-Archive: <http://lists.linuxfoundation.org/pipermail/ksummit-discuss/>
List-Post: <mailto:ksummit-discuss@lists.linuxfoundation.org>
List-Help: <mailto:ksummit-discuss-request@lists.linuxfoundation.org?subject=help>
List-Subscribe: <https://lists.linuxfoundation.org/mailman/listinfo/ksummit-discuss>,
	<mailto:ksummit-discuss-request@lists.linuxfoundation.org?subject=subscribe>

On Thu, Jul 23, 2015 at 10:29:02PM +0200, Pavel Machek wrote:
> Questions I had in mind:
> 
> 1) RGB leds. They are not same as 3 leds. Plus there' hw acceleration
> on them. How to support them?

Seems like internally we should treat them as 3 LEDs, but the interface
to userspace or to the LED trigger mechanism should group the three
brightness values together rather than handling them separately.

Is the hardware acceleration something more than PWM?

- Josh Triplett