[PATCH 2/2] phy: driver for Conexant Digicolor internal USB PHY

Baruch Siach baruch at tkos.co.il
Tue Mar 31 04:34:48 PDT 2015

Hi Marek,

On Sat, Mar 28, 2015 at 04:33:02PM +0100, Marek Vasut wrote:
> On Friday, March 27, 2015 at 05:36:29 AM, Baruch Siach wrote:
> > Add a driver for the USB PHY on the Conexant CX92755 SoC, from the
> > Digicolor series of SoCs. The PHY is connected to the on-chip chipidea
> > usb2 host.
> > 
> > The hardware is somewhat similar to the phy-mxs-usb.c usb_phy, but it is
> > different enough to merit its own driver. Also, this driver uses the
> > generic phy infrastructure.
> the register set looks very similar to MXS one indeed. How is it different 
> please ?

Almost of the bits that are defined in the MXS USBPHY_CTRL register are not 
defined in the Digicolor one. Some have different meaning, and some are 
reserved. OTOH, the Digicolor USBPHY_CTRL register uses all bits in the 1-13 
range. Also, the Digicolor phy does not have anatop registers.

> The driver looks OK.


BTW, do you know why the phy-mxs-usb driver calls its init from 
postcore_initcall? Is there a special need to register the driver so early?


     http://baruch.siach.name/blog/                  ~. .~   Tk Open Systems
   - baruch at tkos.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -

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