[PATCH V2] USB: initialize or shutdown PHY when add or remove host controller

Chao Xie xiechao.mail at gmail.com
Tue Jun 18 23:23:00 EDT 2013

On Wed, Jun 19, 2013 at 10:48 AM, Greg KH <gregkh at linuxfoundation.org> wrote:
> On Tue, Jun 18, 2013 at 10:31:20PM -0400, Chao Xie wrote:
>> Some controller need software to initialize PHY before add
>> host controller, and shut down PHY after remove host controller.
>> Add the generic code for these controllers so they do not need
>> do it in its own host controller driver.
> Why?  What breaks if we add this patch, and what gets fixed?  I'm
> guessing you can then remove code?
> What out-of-tree code now works properly?  Or gets broken?
> we need more info here please...
The patch does not fix any bug.
Some echi-xxx driver will need initialize the phy before it do
usb_add_hcd, and shut down phy after
do usb_remove_hcd, and i did a patch for ehci-mv.c to do above thing.
Alan and Felipe comments on my patch, and they think it is a peice of
generic code, and it can be
moved to hcd to handle it, so other ehci-xxx will not do the same thing again.
So i add the patch to add the generic code in hcd to handle phy
initialization and shut down.

> thanks,
> greg k-h

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