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usb: add devicetree helpers for determining dr_mode and phy_type

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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@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Grzeschik
2013-06-13 17:59:55 +03:00
committed by Greg Kroah-Hartman
parent 2e27041296
commit 1c9af65357
6 changed files with 127 additions and 0 deletions
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35
drivers/usb/usb-common.c
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@@ -13,7 +13,9 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/usb/ch9.h>
#include <linux/usb/of.h>
#include <linux/usb/otg.h>
const char *usb_otg_state_string(enum usb_otg_state state)
@@ -79,4 +81,37 @@ const char *usb_state_string(enum usb_device_state state)
}
EXPORT_SYMBOL_GPL(usb_state_string);
#ifdef CONFIG_OF
static const char *const 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_dr_mode
*/
enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np)
{
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 (!strcmp(dr_mode, usb_dr_modes[i]))
return i;
return USB_DR_MODE_UNKNOWN;
}
EXPORT_SYMBOL_GPL(of_usb_get_dr_mode);
#endif
MODULE_LICENSE("GPL");