linux-kernel - Re: N900 DT

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Date:	Sat, 26 Oct 2013 02:25:02 +0200
From:	Sebastian Reichel <sre@...g0.de>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Jenny TC <jenny.tc@...el.com>,
	Anton Vorontsov <anton.vorontsov@...aro.org>,
	linux-kernel@...r.kernel.org
Subject: Re: N900 DT

Hi Pali,

On Fri, Oct 25, 2013 at 08:39:40PM +0200, Pali Rohár wrote:
> Now I found this patch and it looks like it will be in mainline 
> kernel. And after that it could be simple to listen for needed 
> events from isp driver in my bq driver (without touching isp).
> 
> https://lkml.org/lkml/2013/7/25/204
> 
> Can you look at isp1704 driver for DT support? I think that only 
> one gpio needs to be passed to driver from board data.

I had a quick overview over Jenny's patchset [0] (the patch you
referenced is part of a bigger patchset). I don't think the
scenario found in the Nokia N900 is covered by it, but probably
now is the time to change it :)

So for everybody new to this thread:

Multiple chips are involved in the charging of the Nokia N900
battery:

bq27200:   This chip is used for reading battery status. AFAIK
           it's not directly involved in charging the battery.
bq24150a:  This chip takes care of actually charging the battery.
           It has no clue about USB related stuff. The maximum
           current it draws can be configured, though.
isp1704:   USB charger detector. This chip is used to detect how
           much current may be used by the bq24150a chip.
rx51-temp: Analog temperature sensor for the battery, which is
           connected via an analog-digital-converter.

The question is how to connected these driver with each other
if device tree is used to boot the system. Any suggestions?

[0] http://thread.gmane.org/gmane.linux.kernel/1377608

-- Sebastian

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