linux-kernel - Re: [PATCH 2/5] regulator: Add driver for Maxim 77802 PMIC regulators

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Date:	Tue, 10 Jun 2014 11:53:34 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc:	Lee Jones <lee.jones@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Mike Turquette <mturquette@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Doug Anderson <dianders@...omium.org>,
	Olof Johansson <olof@...om.net>,
	Sjoerd Simons <sjoerd.simons@...labora.co.uk>,
	Daniel Stone <daniels@...labora.com>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] regulator: Add driver for Maxim 77802 PMIC regulators

On Tue, Jun 10, 2014 at 01:29:17AM +0200, Javier Martinez Canillas wrote:
> On 06/09/2014 09:38 PM, Mark Brown wrote:
> > On Mon, Jun 09, 2014 at 11:37:47AM +0200, Javier Martinez Canillas wrote:

> >> +	case REGULATOR_MODE_STANDBY:			/* switch off */
> >> +		if (id != MAX77802_LDO1 && id != MAX77802_LDO20 &&
> >> +			id != MAX77802_LDO21 && id != MAX77802_LDO3) {
> >> +			val = MAX77802_OPMODE_STANDBY;
> >> +			break;
> >> +		}
> >> +		/* no break */

> > This sounds very broken...

> The problem is that not all regulators supports the same operational modes. For
> instance regulators LDO 1, 20, 21 and 3 does not support REGULATOR_MODE_STANDBY
> so if the condition is not met a break is not needed since the default case is
> to warn that the mode is not supported.

No, it's the "switch off" comment...

> But I'll rework that logic on v2 to make it cleaner and have a break on each
> case and don't rely on case cascading.

...though you should also consider splitting things up so you have
separate ops for separate regulators if they behave differently.

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