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

From: Bill Huang
Date: Thu Aug 01 2013 - 06:56:52 EST

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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