linux-kernel - Re: [PATCH V7 3/3] soc/tegra: pmc: Add support for IO pads power state and voltage

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Date:	Thu, 16 Jun 2016 18:46:20 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Jon Hunter <jonathanh@...dia.com>, <thierry.reding@...il.com>,
	<airlied@...ux.ie>, <swarren@...dotorg.org>
CC:	<gnurou@...il.com>, <dri-devel@...ts.freedesktop.org>,
	<linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH V7 3/3] soc/tegra: pmc: Add support for IO pads power
 state and voltage

Hi Thierry,

On Tuesday 24 May 2016 04:18 PM, Jon Hunter wrote:
> On 23/05/16 10:03, Jon Hunter wrote:
>> On 20/05/16 15:45, Laxman Dewangan wrote:
>>> The IO pins of Tegra SoCs are grouped for common control of IO
>>> interface like setting voltage signal levels and power state of
>>> the interface. The group is generally referred as IO pads. The
>>> power state and voltage control of IO pins can be done at IO pads
>>> level.
>>>
>>> Tegra generation SoC supports the power down of IO pads when it
>>> is not used even in the active state of system. This saves power
>>> from that IO interface. Also it supports multiple voltage level
>>> in IO pins for interfacing on some of pads. The IO pad voltage is
>>> automatically detected till T124, hence SW need not to configure
>>> this. But from T210, the automatically detection logic has been
>>> removed, hence SW need to explicitly set the IO pad voltage into
>>> IO pad configuration registers.
>>>
>>> Add support to set the power states and voltage level of the IO pads
>>> from client driver. The implementation for the APIs are in generic
>>> which is applicable for all generation os Tegra SoC.
>>>
>>> IO pads ID and information of bit field for power state and voltage
>>> level controls are added for Tegra124, Tegra132 and Tegra210. The SOR
>>> driver is modified to use the new APIs.
>>>
>>> Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>

Can you please review this?

Thanks,
Laxman