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usb: common: add API to update usb otg capabilities by device tree

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Check property of usb hardware to update otg version and disable SRP, HNP
and ADP if its disable flag is present.

Reviewed-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Li Jun <jun.li@freescale.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Li Jun 2015-07-09 15:18:44 +08:00 committed by Felipe Balbi
parent b5513dede7
commit 929412d94f
2 changed files with 63 additions and 0 deletions
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56
drivers/usb/common/common.c
View File

@ -154,6 +154,62 @@ bool of_usb_host_tpl_support(struct device_node *np)
return false; return false;
} }
EXPORT_SYMBOL_GPL(of_usb_host_tpl_support); EXPORT_SYMBOL_GPL(of_usb_host_tpl_support);
/**
* of_usb_update_otg_caps - to update 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 updates the otg capabilities
*/
int of_usb_update_otg_caps(struct device_node *np,
struct usb_otg_caps *otg_caps)
{
u32 otg_rev;
if (!otg_caps)
return -EINVAL;
if (!of_property_read_u32(np, "otg-rev", &otg_rev)) {
switch (otg_rev) {
case 0x0100:
case 0x0120:
case 0x0130:
case 0x0200:
/* Choose the lesser one if it's already been set */
if (otg_caps->otg_rev)
otg_caps->otg_rev = min_t(u16, otg_rev,
otg_caps->otg_rev);
else
otg_caps->otg_rev = otg_rev;
break;
default:
pr_err("%s: unsupported otg-rev: 0x%x\n",
np->full_name, otg_rev);
return -EINVAL;
}
} else {
/*
* otg-rev is mandatory for otg properties, if not passed
* we set it to be 0 and assume it's a legacy otg device.
* Non-dt platform can set it afterwards.
*/
otg_caps->otg_rev = 0;
}
if (of_find_property(np, "hnp-disable", NULL))
otg_caps->hnp_support = false;
if (of_find_property(np, "srp-disable", NULL))
otg_caps->srp_support = false;
if (of_find_property(np, "adp-disable", NULL) ||
(otg_caps->otg_rev < 0x0200))
otg_caps->adp_support = false;
return 0;
}
EXPORT_SYMBOL_GPL(of_usb_update_otg_caps);
#endif #endif
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");

7
include/linux/usb/of.h
View File

@ -15,6 +15,8 @@
enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np); 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); enum usb_device_speed of_usb_get_maximum_speed(struct device_node *np);
bool of_usb_host_tpl_support(struct device_node *np); bool of_usb_host_tpl_support(struct device_node *np);
int of_usb_update_otg_caps(struct device_node *np,
struct usb_otg_caps *otg_caps);
#else #else
static inline enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np) 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; return false;
} }
static inline int of_usb_update_otg_caps(struct device_node *np,
struct usb_otg_caps *otg_caps)
{
return 0;
}
#endif #endif
#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_SUPPORT) #if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_SUPPORT)