linux-kernel - Re: [PATCH 5/5] mfd: wm5110: Set DCVDD voltage to 1.175V before entering sleep mode

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Message-ID: <20150316182809.GA23705@opensource.wolfsonmicro.com>
Date:	Mon, 16 Mar 2015 18:28:09 +0000
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	lee.jones@...aro.org, sameo@...ux.intel.com, lgirdwood@...il.com,
	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] mfd: wm5110: Set DCVDD voltage to 1.175V before
	entering sleep mode

On Mon, Mar 16, 2015 at 05:17:55PM +0000, Mark Brown wrote:
> On Mon, Mar 16, 2015 at 04:58:44PM +0000, Charles Keepax wrote:
> 
> > +	} else {
> > +		switch (arizona->type) {
> > +		case WM5110:
> > +		case WM8280:
> > +			ret = regulator_set_voltage(arizona->dcvdd,
> > +						    1175000, 1175000);
> > +			if (ret < 0) {
> 
> Can we please have a comment about this being the internal LDO and us
> therefore knowing exactly what voltages it supports (or just that it's
> the on chip LDO)?  Going for a single voltage with zero tolerance is
> usually bad practice since it causes needless interoperability issues
> (eg, here the chances that the hardware would mind if an external
> regulator were only able to deliver 1.174V rather than 1.175V are
> minimal).  This is fine here but people might be looking for examples
> and get the wrong idea.

Yeah no problem I will respin and add that.

Thanks,
Charles
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