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usb: common: add support to get maximum speed from dt

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Add support to get maximum speed from dt so that usb drivers
makes use of it for DT parsing.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
(rebase and fix errors)
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Mugunthan V N 2018-05-18 13:15:05 +02:00 committed by Marek Vasut
parent 23ba2d6372
commit 59592b99d8
2 changed files with 38 additions and 0 deletions
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29
drivers/usb/common/common.c
View file

@ -9,6 +9,7 @@
#include <common.h>
#include <linux/libfdt.h>
#include <linux/usb/otg.h>
#include <linux/usb/ch9.h>
DECLARE_GLOBAL_DATA_PTR;
@ -37,3 +38,31 @@ enum usb_dr_mode usb_get_dr_mode(int node)
return USB_DR_MODE_UNKNOWN;
}
static const char *const speed_names[] = {
[USB_SPEED_UNKNOWN] = "UNKNOWN",
[USB_SPEED_LOW] = "low-speed",
[USB_SPEED_FULL] = "full-speed",
[USB_SPEED_HIGH] = "high-speed",
[USB_SPEED_WIRELESS] = "wireless",
[USB_SPEED_SUPER] = "super-speed",
};
enum usb_device_speed usb_get_maximum_speed(int node)
{
const void *fdt = gd->fdt_blob;
const char *max_speed;
int i;
max_speed = fdt_getprop(fdt, node, "maximum-speed", NULL);
if (!max_speed) {
pr_err("usb maximum-speed not found\n");
return USB_SPEED_UNKNOWN;
}
for (i = 0; i < ARRAY_SIZE(speed_names); i++)
if (!strcmp(max_speed, speed_names[i]))
return i;
return USB_SPEED_UNKNOWN;
}

9
include/linux/usb/otg.h
View file

@ -25,4 +25,13 @@ enum usb_dr_mode {
*/
enum usb_dr_mode usb_get_dr_mode(int node);
/**
* usb_get_maximum_speed() - Get maximum speed for given device
* @node: Node offset to the given device
*
* The function gets phy interface string from property 'maximum-speed',
* and returns the correspondig enum usb_device_speed
*/
enum usb_device_speed usb_get_maximum_speed(int node);
#endif /* __LINUX_USB_OTG_H */