linux-kernel - Re: [PATCH v2] regulator: mc13783: consider Power Gates as digital regulators.

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Message-ID: <1264082195.2396.137.camel@odin>
Date:	Thu, 21 Jan 2010 13:56:35 +0000
From:	Liam Girdwood <lrg@...mlogic.co.uk>
To:	Alberto Panizzo <maramaopercheseimorto@...il.com>
Cc:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Sascha linux-arm <s.hauer@...gutronix.de>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.arm.linux.org.uk>
Subject: Re: [PATCH v2] regulator: mc13783: consider Power Gates as digital
 regulators.

On Tue, 2010-01-19 at 12:48 +0100, Alberto Panizzo wrote:
> GPO regulators are digital outputs that can be enabled or disabled by a
> dedicated bit in mc13783 POWERMISC register.
> In this family can be count in also Power Gates (PWGT1 and 2): enabled by
> a dedicated pin a Power Gate is an hardware driven supply where the output
> (PWGTnDRV) follow this law:
> 
>  Bit PWGTxSPIEN | Pin PWGTxEN | PWGTxDRV |  Read Back
>    0 = default  |             |          | PWGTxSPIEN
>  ---------------+-------------+----------+------------
>        1        |      x      |   Low    |     0
>        0        |      0      |   High   |     1
>        0        |      1      |   Low    |     0
> 
> As read back value of control bit reflects the PWGTxDRV state (not the
> control value previously written) and mc13783 POWERMISC register contain
> only regulator related bits, a dedicated function to manage these bits is 
> created here with the aim of tracing the real value of PWGTxSPIEN bits
> and reproduce it on next writes.
> 
> All POWERMISC users _must_ use the new function to not accidentally
> disable Power Gates supplies.
> 
> v2 changes:
> -Better utilization of abstraction layers.
> -Voltage query support. GPO's and PWGTxDRV are fixed voltage regulator
>  with voltage value of 3.1V and 5.5V respectively.
> 
> Signed-off-by: Alberto Panizzo <maramaopercheseimorto@...il.com>

Applied.

Thanks

Liam

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