linux-kernel - Re: [PATCH v5 2/3] regulator: tps6586x: add and use correct voltage table

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Date:	Fri, 6 Dec 2013 15:40:06 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Stefan Agner <stefan@...er.ch>
Cc:	swarren@...dotorg.org, thierry.reding@...il.com, dev@...xeye.de,
	lgirdwood@...il.com, broonie@...nel.org,
	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 v5 2/3] regulator: tps6586x: add and use correct voltage
 table

On Fri, 06 Dec 2013, 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.
> 
> Signed-off-by: Stefan Agner <stefan@...er.ch>
> ---
> Changes since v3:
>   - Check if version specific table is necessary
> 
> Changes since v2:
>   - Removed reg_ from reg_version
>   - Moved walk through version dependent tables to find_regulator_info,
>     removed the inline definition. This reduces .o size and encapsulates
>     the logic of finding the right regulator into one function. It comes
>     with a slight code duplication, the table search now appears twice.
> ---
>  arch/arm/boot/dts/tegra20-colibri-512.dtsi |  4 +-
>  drivers/regulator/tps6586x-regulator.c     | 93 ++++++++++++++++++++++++-----

Applied with Reviews and Acks.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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