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Commit 929412d9 authored by Li Jun's avatar Li Jun Committed by Felipe Balbi
Browse files

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



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

Reviewed-by: default avatarRoger Quadros <rogerq@ti.com>
Signed-off-by: default avatarLi Jun <jun.li@freescale.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent b5513ded

drivers/usb/common/common.c

+56 −0
Original line number Diff line number Diff line
@@ -154,6 +154,62 @@ bool of_usb_host_tpl_support(struct device_node *np) 
	return false;

}

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



MODULE_LICENSE("GPL");

include/linux/usb/of.h

+7 −0
Original line number Diff line number Diff line
@@ -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);

int of_usb_update_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 int of_usb_update_otg_caps(struct device_node *np,

				struct usb_otg_caps *otg_caps)

{

	return 0;

}

#endif



#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_SUPPORT)