On Mon, Nov 19, 2012 at 08:17:34PM +0100, Sascha Hauer wrote:
> Hi Peter,
>
> > @@ -139,6 +139,7 @@ struct ci13xxx {
> > enum ci_role role;
> > bool is_otg;
> > struct work_struct work;
> > + struct delayed_work dwork;
> > struct workqueue_struct *wq;
> >
> > struct dma_pool *qh_pool;
> > @@ -164,6 +165,11 @@ struct ci13xxx {
> > bool global_phy;
> > struct usb_phy *transceiver;
> > struct usb_hcd *hcd;
> > + /* events handled at ci_role_work */
> > +#define ID 0
> > +#define B_SESS_VALID 1
> > + unsigned long events;
> > + struct usb_otg otg;
>
> I looked into implementing ULPI support for the chipidea driver. This
> does not integrate very well with having a struct usb_otg here. Instead
> it should be a pointer. Look into drivers/usb/otg/ulpi.c. This
> allocates the struct usb_otg itself and we have to feed the pointer into
> struct ci13xxx.
We discussed before that the otg is not related to phy.
The struct usb_otg is better allocated at the otg driver, not phy driver.
But I find the otg APIs .set_host and .set_vbus are defined at ulpi.c,
and operate phy's registers. Besides, I find only otg port can access ulpi
API, correct? If it is, how host only port access ulpi register, eg, i.mx51
host 1.
To integrate ULPI phy, how about this?
- struct usb_otg is created at drivers/usb/chipidea/otg.c
- usb_phy_init needs to move after struct usb_otg is created.
- The struct usb_otg's API can be override by usb_phy_init
- At ulpi.c, do not create struct usb_otg, at ulpi_init, override
otg.set_host, and otg.set_vbus.
>
> Also I think that using a regulator as a vbus provider is not i.MX
> specific, it's not even chipidea specific. I think this should be a
> driver of its own under drivers/usb/otg/, or maybe part of
> drivers/usb/otg/gpio_vbus.c.
To make it as generic driver(we can't use gpio_vbus.c), more things
need to consider:
- This gpio_vbus_reg.c driver needs to know usb role (host or device)
- For host, it needs to enable regulator at initialization process,
and disable regulator after usb driver unload.
so, the vbus control interfaces between gpio_vbus_reg.c and usb driver
are needed.
>
> Sascha
>
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>
--
Best Regards,
Peter Chen
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