On Wed, Jun 17, 2015 at 11:45:45AM +0300, Roger Quadros wrote:
>
> On Wed, 17 Jun 2015 13:43:39 +0800
> Li Jun <[email protected]> wrote:
>
> > Check property of usb hardware to get otg version and if SRP, HNP and ADP
> > are supported.
> >
> > Signed-off-by: Li Jun <[email protected]>
> > ---
> > drivers/usb/common/common.c | 29 +++++++++++++++++++++++++++++
> > include/linux/usb/of.h | 7 +++++++
> > 2 files changed, 36 insertions(+)
> >
> > diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
> > index b530fd4..b846172 100644
> > --- a/drivers/usb/common/common.c
> > +++ b/drivers/usb/common/common.c
> > @@ -154,6 +154,35 @@ bool of_usb_host_tpl_support(struct device_node *np)
> > return false;
> > }
> > EXPORT_SYMBOL_GPL(of_usb_host_tpl_support);
> > +
> > +/**
> > + * of_usb_get_otg_caps - to get usb otg capabilities according to
> > + * the passed properties in DT.
> > + * @np: Pointer to the given device_node
> > + * @otg_caps: Pointer to the target usb_otg_caps to be set
> > + *
> > + * The function gets and sets the otg capabilities
> > + */
> > +void of_usb_get_otg_caps(struct device_node *np, struct usb_otg_caps
> > *otg_caps)
> > +{
> > + u32 otg_rev;
> > +
> > + if (!otg_caps)
> > + return;
> > +
> > + if (!of_property_read_u32(np, "otg-rev", &otg_rev)) {
> > + otg_caps->otg_rev = otg_rev;
> > + if (!of_find_property(np, "hnp-disable", NULL))
> > + otg_caps->hnp_support = true;
> > + if (!of_find_property(np, "srp-disable", NULL))
> > + otg_caps->hnp_support = true;
>
> srp_support = true;
>
My fault.
> > + if (!of_find_property(np, "adp-disable", NULL) &&
> > + (otg_caps->otg_rev >= 0x0200))
> > + otg_caps->hnp_support = true;
>
> adp_support = true;
>
My fault.
> > + }
>
> I think we are loosing information here.
> The DT disable flags get changed to enable flags (xyz_support)
> and after this we can't really tell if the device tree really
> wanted us to disable the feature or enable it based on
> otg_rev/controller capabilities.
>
> Why not pass controller caps in otg_caps and then disable the
> flags if requested from DT?
> if (of_find_property(np, "foo-disbale", NULL))
> otg_caps->foo_support = false;
>
> The controller can still override anything afterwards
> if it things something is wrong.
> My guess is most controllers won't have to.
>
After more thinking, I think I can use the normal usage of disable flags
to handle this, I will update, thanks.
Li Jun
> > +}
> > +EXPORT_SYMBOL_GPL(of_usb_get_otg_caps);
> > +
> > #endif
> >
> > MODULE_LICENSE("GPL");
> > diff --git a/include/linux/usb/of.h b/include/linux/usb/of.h
> > index cfe0528..bbf302b9 100644
> > --- a/include/linux/usb/of.h
> > +++ b/include/linux/usb/of.h
> > @@ -15,6 +15,8 @@
> > enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np);
> > enum usb_device_speed of_usb_get_maximum_speed(struct device_node *np);
> > bool of_usb_host_tpl_support(struct device_node *np);
> > +void of_usb_get_otg_caps(struct device_node *np,
> > + struct usb_otg_caps *otg_caps);
> > #else
> > static inline enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np)
> > {
> > @@ -30,6 +32,11 @@ static inline bool of_usb_host_tpl_support(struct
> > device_node *np)
> > {
> > return false;
> > }
> > +static inline void of_usb_get_otg_caps(struct device_node *np,
> > + struct usb_otg_caps *otg_caps)
> > +{
> > +
> > +}
> > #endif
> >
> > #if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_SUPPORT)
>
> cheers,
> -roger
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