linux-kernel - Re: [PATCH v4 2/3] regulator: tps6586x: add and use correct voltage table

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Date:	Thu, 05 Dec 2013 10:10:18 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Stefan Agner <stefan@...er.ch>, thierry.reding@...il.com,
	dev@...xeye.de, lee.jones@...aro.org, lgirdwood@...il.com,
	broonie@...nel.org
CC:	kai.poggensee@...onic-design.de, sameo@...ux.intel.com,
	linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/3] regulator: tps6586x: add and use correct voltage
 table

On 12/03/2013 03:18 PM, Stefan Agner wrote:
> Depending on the regulator version, the voltage table might be 
> different. Use version specific regulator tables in order to
> select correct voltage table. For the following regulator versions
> different voltage tables are now used:
> 
> * TPS658623: Use correct voltage table for SM2 * TPS658643: New
> voltage table for SM2
> 
> Both versions are in use on the Colibri T20 module. Make use of
> the correct tables by requesting the correct SM2 voltage of 1.8V.
> 
> This change is not backward compatible since an old driver is not
> able to correctly set that value. The value 1.8V is out of range
> for the old driver and will refuse to probe the device. The
> regulator starts with default settings and the driver shows
> appropriate error messages.
> 
> On Colibri T20, the old value used to work with TPS658623 since
> the driver applied a wrong voltage table too. However, the
> TPS658643 used on V1.2 devices uses yet another voltage table and
> those broke that pseudo-compatibility. The regulator driver now has
> the correct voltage table for both regulator versions and those the
> correct voltage can be used in the device tree.

Acked-by: Stephen Warren <swarren@...dia.com>
(yes, taking this through the MFD tree with patch 1/3 makes sense)
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