Re: [PATCH v2] regulator: mc13783: consider Power Gates as digitalregulators.
From: Liam Girdwood
Date: Thu Jan 21 2010 - 08:56:49 EST
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@xxxxxxxxx>
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