linux-kernel - Re: [PATCH v4] extcon: Palmas Extcon Driver

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Date:	Tue, 7 May 2013 08:58:24 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Kishon Vijay Abraham I <kishon@...com>
Cc:	myungjoo.ham@...sung.com, cw00.choi@...sung.com, balbi@...com,
	ldewangan@...dia.com, devicetree-discuss@...ts.ozlabs.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	grant.likely@...aro.org, rob.herring@...xeda.com, rob@...dley.net,
	gg@...mlogic.co.uk, ruchika@...com, tony@...mide.com,
	sameo@...ux.intel.com
Subject: Re: [PATCH v4] extcon: Palmas Extcon Driver

On Tue, May 07, 2013 at 10:42:53AM +0530, Kishon Vijay Abraham I wrote:
> On Monday 06 May 2013 08:10 PM, Mark Brown wrote:
> >On Mon, May 06, 2013 at 06:47:04PM +0530, Kishon Vijay Abraham I wrote:
> >
> >>+		if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
> >>+			if (palmas_usb->vbus_reg) {
> >>+				ret = regulator_enable(palmas_usb->vbus_reg);
> >>+				if (ret) {
> >>+					dev_dbg(palmas_usb->dev,
> >>+						"regulator enable failed\n");
> >>+					goto ret0;

> >This is very bad karma, why is the regulator optional?

> The platform can provide it's own vbus control in which case this is
> not needed.

So why is there no interaction with this external VBUS control and how
does the driver distinguish between that and an error getting the
regulator?

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