On Thu, Jan 31, 2013 at 10:30:36AM +0800, Peter Chen wrote:
> On Wed, Jan 30, 2013 at 04:29:38PM +0100, Sascha Hauer wrote:
> > From: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
> >
> > This adds two little devicetree helper functions for determining the
> > dr_mode (host, peripheral, otg) and phy_type (utmi, ulpi,...) from
> > the devicetree.
> >
> > Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
> > Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
> > Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> > ---
> > drivers/usb/usb-common.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++
> > include/linux/usb/of.h | 27 ++++++++++++++++++
> > include/linux/usb/otg.h | 7 +++++
> > include/linux/usb/phy.h | 9 ++++++
> > 4 files changed, 112 insertions(+)
> > create mode 100644 include/linux/usb/of.h
> >
> > diff --git a/drivers/usb/usb-common.c b/drivers/usb/usb-common.c
> > index d29503e..1c0292c 100644
> > --- a/drivers/usb/usb-common.c
> > +++ b/drivers/usb/usb-common.c
> > @@ -14,6 +14,9 @@
> > #include <linux/kernel.h>
> > #include <linux/module.h>
> > #include <linux/usb/ch9.h>
> > +#include <linux/of.h>
> > +#include <linux/usb/of.h>
> > +#include <linux/usb/otg.h>
> >
> > const char *usb_speed_string(enum usb_device_speed speed)
> > {
> > @@ -32,4 +35,70 @@ const char *usb_speed_string(enum usb_device_speed speed)
> > }
> > EXPORT_SYMBOL_GPL(usb_speed_string);
> >
> > +#ifdef CONFIG_OF
> > +static const char *usb_dr_modes[] = {
> > + [USB_DR_MODE_UNKNOWN] = "",
> > + [USB_DR_MODE_HOST] = "host",
> > + [USB_DR_MODE_PERIPHERAL] = "peripheral",
> > + [USB_DR_MODE_OTG] = "otg",
> > +};
> > +
> > +/**
> > + * of_usb_get_dr_mode - Get dual role mode for given device_node
> > + * @np: Pointer to the given device_node
> > + *
> > + * The function gets phy interface string from property 'dr_mode',
> > + * and returns the correspondig enum usb_phy_dr_mode
> > + */
> > +enum usb_phy_dr_mode of_usb_get_dr_mode(struct device_node *np)
> The word "phy" at usb_phy_dr_mode may cause misunderstand, just usb_dr_mode
> is ok
ok, changed.
> > +{
> > + const char *dr_mode;
> > + int err, i;
> > +
> > + err = of_property_read_string(np, "dr_mode", &dr_mode);
> > + if (err < 0)
> > + return USB_DR_MODE_UNKNOWN;
> > +
> > + for (i = 0; i < ARRAY_SIZE(usb_dr_modes); i++)
> > + if (!strcasecmp(dr_mode, usb_dr_modes[i]))
> > + return i;
> Just curious, why not using strcmp?
Probably because this is based on drivers/of/of_net.c which uses
strcasecmp. I never heard that devicetrees are case insensitive, so
I'll change this to strcmp.
> > +
> > + return USB_DR_MODE_UNKNOWN;
> > +}
> > +
> > +#ifdef CONFIG_OF
> > +enum usb_phy_interface of_usb_get_phy_mode(struct device_node *np);
> > +enum usb_phy_dr_mode of_usb_get_dr_mode(struct device_node *np);
> > +#else
> > +static inline enum usb_phy_interface of_usb_get_phy_mode(struct device_node *np)
> > +{
> > + return USBPHY_INTERFACE_MODE_NA;
> > +}
> > +
> > +static inline enum usb_phy_dr_mode of_usb_get_dr_mode(struct device_node *np)
> > +{
> > + return USB_DR_MODE_UNKNOWN;
> > +}
> For, dr_mode, if value has not existed, you use *_UNKNOWN, why
> for usbphy, you use *_NA. It is better uniform.
yup, fixed.
Sascha
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