linux-kernel - Re: [PATCH 0/3] regulator: tps6586x: add version detection and voltage tables

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Date:	Fri, 29 Nov 2013 09:20:37 +0100
From:	Kai Poggensee <kai.poggensee@...onic-design.de>
To:	linux-kernel@...r.kernel.org
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] regulator: tps6586x: add version detection and voltage
 tables

On 28.11.2013 09:13, Thierry Reding wrote:
> On Wed, Nov 27, 2013 at 12:45:42AM +0100, Stefan Agner wrote:
>> This patchset adds version detection for the tps6586x mfd family. This is
>> required because some regulator versions use different voltage tables. The
>> regulator driver now uses the right voltage table according to the
>> version.
>> 
>> The required voltage for the SM2 converter on the Colibri T20 is 1.8V,
>> however, the device tree states 3.7V right now. Newer versions (>=V1.2) of
>> the Colibri T20 module use the TPS658643, whereas old ones (<V1.2) use the
>> TPS658623. Both of them have a different voltage table for SM2. The
>> current device tree contains a voltage which results in 1.8V for the older
>> TPS658623. Since the regulator driver has correct voltage tables for both
>> regulator versions now, we can request the correct 1.8V from the device
>> tree.
>> 
>> Tested on Colibri T20 V1.1 and V1.2.
>> 
>> Stefan Agner (3):
>>   mfd: tps6586x: add version detection
>>   regulator: tps6586x: add voltage table for tps658643
>>   ARM: tegra: set SM2 voltage correct
>> 
>>  arch/arm/boot/dts/tegra20-colibri-512.dtsi |  4 +-
>>  drivers/mfd/tps6586x.c                     | 41 +++++++++++--
>>  drivers/regulator/tps6586x-regulator.c     | 97 ++++++++++++++++++++----------
>>  include/linux/mfd/tps6586x.h               |  9 +++
>>  4 files changed, 110 insertions(+), 41 deletions(-)
> 
> Adding Kai Poggensee on Cc. There was a variant of the Tamonten board
> with one of these versions of the chip (or maybe it was even yet another
> one).

Thanks Thierry,

we'll be more than happy to support testing once the
re-spun patch is posted. However, we will probably
do so by back-porting to L4T 16.3.

For the records:
We are using TPS658621C on first variant of Tamonten
Tegra 2 COM (internally called 1373-111), we are using
TPS658640 on variant two (1373-121).

This second variant was created to be 100% compatible
with our TamontenNG Tegra 3 COM (basically omitting some
previously unused interfaces), using TPS658640 was an
opportunistic optimization.

Regards,
Kai

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