linux-kernel - Re: device tree bindings for lp5523 leds on N950?

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Date:   Fri, 3 Nov 2017 22:28:13 +0100
From:   Pavel Machek <pavel@....cz>
To:     Sebastian Reichel <sebastian.reichel@...labora.co.uk>
Cc:     pali.rohar@...il.com, kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
        aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
        patrikbachan@...il.com, serge@...lyn.com, abcloriens@...il.com
Subject: Re: device tree bindings for lp5523 leds on N950?

Hi!

> On Tue, Aug 15, 2017 at 09:15:28AM -0400, Sebastian Reichel wrote:
> > Hi Pavel,
> > 
> > On Mon, Aug 14, 2017 at 03:38:16PM +0200, Pavel Machek wrote:
> > > I'm (still) trying to debug "N950 not booting" situation. I'm stuck
> > > with black screen, so I thought it would be cool to use RGB led for
> > > debugging...
> > > 
> > > Unfortunately, I don't see required dts bindings in the mainline.
> > > 
> > > Does anyone have that working?
> > 
> > I have some N950 DTS patches lying around, I think RGB led was one
> > of them. I'm currently in Canda for a company event without my N950,
> > but I should be able to send something tested before the weekend.
> 
> Below is a DTS snippet for N950, that has been tested by me
> on top of 4.13-rc6. The left and right keyboard LEDs are
> also debug LEDs for cpu idle modes, so they will be lit
> without being enabled in lp5523. The status LED of N950 is
> not RGB, but just white. Also you need this to get the driver
> loading. Otherwise detection after reset fails even after
> quite increases waiting times. Looks like the lp5523 reset
> (which is not properly Ack'd by the device) breaks the omap-i2c
> state horribly.

Thanks a lot, LED now works. It took me a while, but I now have n950
usable with nfsroot. (For a while, anyway.)

N9 is usable too. Hardware is similar enough than it could be possible
to debug without serial cable.

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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