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usb: common: introduce of_usb_get_maximum_speed()

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this helper will be used for controllers which
want to work at a lower speed even though they
support higher USB transfer rates.

One such case is Texas Instruments' AM437x
SoC where it uses a USB3 controller without
a USB3 PHY, rendering the controller USB2-only.

Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Felipe Balbi
2013-06-30 13:56:45 +03:00
parent 410aee70f0
commit 1494a1f62b
3 changed files with 70 additions and 11 deletions
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8
include/linux/usb/of.h
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@@ -7,16 +7,24 @@
#ifndef __LINUX_USB_OF_H
#define __LINUX_USB_OF_H
#include <linux/usb/ch9.h>
#include <linux/usb/otg.h>
#include <linux/usb/phy.h>
#if IS_ENABLED(CONFIG_OF)
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);
#else
static inline enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np)
{
return USB_DR_MODE_UNKNOWN;
}
static inline enum usb_device_speed
of_usb_get_maximum_speed(struct device_node *np)
{
return USB_SPEED_UNKNOWN;
}
#endif
#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_PHY)