linux-kernel - Re: [PATCH v2 1/1] mfd: palmas: Add power off control

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Date:	Thu, 1 Aug 2013 04:08:52 -0700
From:	Bill Huang <bilhuang@...dia.com>
To:	Nishanth Menon <nm@...com>
CC:	"sameo@...ux.intel.com" <sameo@...ux.intel.com>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"ian.campbell@...rix.com" <ian.campbell@...rix.com>,
	"rob@...dley.net" <rob@...dley.net>,
	"lee.jones@...aro.org" <lee.jones@...aro.org>,
	"broonie@...aro.org" <broonie@...aro.org>,
	"j-keerthy@...com" <j-keerthy@...com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"ian@...mlogic.co.uk" <ian@...mlogic.co.uk>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mallikarjun Kasoju <mkasoju@...dia.com>
Subject: Re: [PATCH v2 1/1] mfd: palmas: Add power off control

On Wed, 2013-07-31 at 19:57 +0800, Nishanth Menon wrote:
> 
> If you notice the reference code I send, atleast on TWL6035/37 variants 
> of Palmas, USB IRQ unmask is mandatory for power on with USB cable - 
> example usage scenario: extremely low battery, device powered off, plug 
> in usb cable to restart charging - you'd like to initiate charging logic 
> in bootloader, but that wont work if the device does not do OFF-ON 
> transition with usb cable plugged in for vbus.
> 
Why do we need to add Palmas USB_IRQ unmask logic in shutdown? Does that
mean for all platform using Palmas has to unmask USB IRQ (including
those do not power vbus through Palmas)? Can't we just have a simple
shutdown function but have the VBus programming been done in USB driver
or maybe platform driver since it is platform specific control?

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