linux-kernel - Re: [PATCH 6/6] regulator: anatop: set default voltage selector for pcie

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Date:   Thu, 13 Apr 2017 15:41:03 +0800
From:   Dong Aisheng <dongas86@...il.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Dong Aisheng <aisheng.dong@....com>, linux-kernel@...r.kernel.org,
        shawnguo@...nel.org, linux-arm-kernel@...ts.infradead.org,
        kernel@...gutronix.de, lgirdwood@...il.com, yibin.gong@....com,
        Richard Zhu <hongxing.zhu@....com>
Subject: Re: [PATCH 6/6] regulator: anatop: set default voltage selector for
 pcie

On Tue, Apr 11, 2017 at 09:40:03PM +0100, Mark Brown wrote:
> On Wed, Apr 12, 2017 at 09:58:47AM +0800, Dong Aisheng wrote:
> > Set the initial voltage selector for vddpcie in case it's disabled
> > by default.
> 
> Why is this the only anatop regulator which can have this problem and
> how do we know this is a good value?

Anatop regulator has no separate gate bit.
e.g.
00000 Power gated off
00001 Target core voltage = 0.725V
...
So it may have no valid default voltage in case it's disabled in
bootloader.
e.g. regulator_enable() may not work.

The default voltage 1.100v this patch sets is defined in reference
manual.

Regards
Dong Aisheng