From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kishon Vijay Abraham I Subject: Re: [PATCH v4] extcon: Palmas Extcon Driver Date: Tue, 7 May 2013 15:17:08 +0530 Message-ID: <5188CD9C.6010602@ti.com> References: <1362662506-14823-4-git-send-email-kishon@ti.com> <1367846225-15685-1-git-send-email-kishon@ti.com> <20130506144010.GF13472@opensource.wolfsonmicro.com> <51888D55.3090907@ti.com> <20130507075824.GM7478@sirena.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20130507075824.GM7478@sirena.org.uk> Sender: linux-doc-owner@vger.kernel.org To: Mark Brown , gg@slimlogic.co.uk Cc: myungjoo.ham@samsung.com, cw00.choi@samsung.com, balbi@ti.com, ldewangan@nvidia.com, devicetree-discuss@lists.ozlabs.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, grant.likely@linaro.org, rob.herring@calxeda.com, rob@landley.net, ruchika@ti.com, tony@atomide.com, sameo@linux.intel.com List-Id: devicetree@vger.kernel.org Hi, On Tuesday 07 May 2013 01:28 PM, Mark Brown wrote: > 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? The platform specifies if it provides its own VBUS control by the dt property ti,no_control_vbus. So the driver will give an error only when *ti,no_control_vbus* is not set. Graeme? Thanks Kishon