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

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>

diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index 17a0ab23ff536c563be2cc414e4ca6ef39ea3a7e..a55def5aba67466d83d829af88e8c657a886d752 100644 (file)
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -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;
+}

diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
index 0b273d8e2e8a657dc0fbdfb4bd55e3668bd3b08b..d2604c5cafba5f3ef03d8ec216082ea09e354284 100644 (file)
--- a/include/linux/usb/otg.h
+++ b/include/linux/usb/otg.h
@@ -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 */