[PATCH v3 5/7] usb: chipidea: usbmisc: add support for ahb, ipg and per clock

[Peter Chen]

On Fri, Nov 23, 2012 at 05:20:51PM +0100, Michael Grzeschik wrote:
> > usbphy: used to transfer data
> > (like your per)
> 
> The "per" clk is a different clk than the usbphy. We have an usbphy clk
> aswell on the mx5x. As discussed before [1], we need a solution to enable
> the usbphy clk. The current approach is to let the nop-xceiver enable
> this.
> 
> [1] http://www.spinics.net/lists/linux-usb/msg74489.html
It does not matter which the name is, this clock is related to usb 480M or 
its source. We use nop-xceiver is just to create struct usb_otg
and usb_phy. Clock information can be at imx specific file like
cil13xxx_imx.

> 
> > mx6q:
> > - usboh3(Index 162 at DT), used to access register
> > - usbphy(Index 182 for otg port at DT), at phy controller
> 
> > So, we may consider a way to consolidate both mx6q (mx28) and mxc (mx5x, mx3x)
> > platforms.
> 
> Yes, we will discuss a real clktree solution in the usbmisc driver for
> the different cores. The first thoughts are, that the clk configuration
> has completely to be done inside the usbmisc driver. For this, the
> usbmisc needs to become a hard dependency for the ci13xxx_imx glue code.

For my mind, imx usb clock handling is better only at place, that is
cil13xxx_imx. We can have imx_clk_enable and imx_clk_disable in it,
and handling clk in imx_clk_enable using id_table or what else platform
specific.
> 
> Regards,
> Michael
> 
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Best Regards,
Peter Chen