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

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Message-ID: <20150316171755.GV28806@sirena.org.uk>
Date:	Mon, 16 Mar 2015 17:17:55 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
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 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.

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