Re: [PATCH v2] chipidea: ci_hdrc_imx: Allow handling the clock for an USB phy/hub

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, 14 Nov 2013, Peter Chen wrote:

> On Thu, Nov 14, 2013 at 08:47:40AM -0200, Fabio Estevam wrote:
> > From: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx>
> > 
> > When using external USB PHY or USB hub, it is common that they require a clock
> > input.
> 
> If it is an external USB PHY, the clock entry should be added at phy node.
> If it is a USB HUB's reset/clock pin, there is no good place to
> put them, only platform code is available now.
> 
> Alan, if there is an external USB HUB, but clock and reset pin needs to
> be controlled, eg, after controller's initialization but before HUB's
> enumeration. How we handle such kinds of case?

We don't have any good way of handling it.  Several people have run
across this type of problem in the past, but no general solution has
been found.

Alan Stern

--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux Media]     [Linux Input]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Old Linux USB Devel Archive]

  Powered by Linux