[U-Boot] [PATCH v2 05/13] drivers: usb: common: add support to get maximum speed from dt

[Vignesh R <vigneshr@ti.com>]

From: Mugunthan V N <mugunthanvnm@ti.com>

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: Vignesh R <vigneshr@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
 drivers/usb/common/common.c | 29 +++++++++++++++++++++++++++++
 include/linux/usb/otg.h     |  9 +++++++++
 scripts/Makefile.spl        |  1 +
 3 files changed, 39 insertions(+)

diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index 35c2dc18d955..c11689dc36fa 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -10,6 +10,7 @@
 #include <common.h>
 #include <libfdt.h>
 #include <linux/usb/otg.h>
+#include <linux/usb/ch9.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -38,3 +39,31 @@ 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) {
+		error("usb dr_mode not found\n");
+		return USB_DR_MODE_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 8f8ac6aeefe3..b61ef19b22f3 100644
--- a/include/linux/usb/otg.h
+++ b/include/linux/usb/otg.h
@@ -26,4 +26,13 @@ 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 */
diff --git a/scripts/Makefile.spl b/scripts/Makefile.spl
index ac3c2c7f1342..bffea085b329 100644
--- a/scripts/Makefile.spl
+++ b/scripts/Makefile.spl
@@ -78,6 +78,7 @@ endif
 
 libs-$(CONFIG_SPL_LIBDISK_SUPPORT) += disk/
 libs-y += drivers/
+libs-y += drivers/usb/common/
 libs-$(CONFIG_SPL_USB_GADGET_SUPPORT) += drivers/usb/dwc3/
 libs-y += dts/
 libs-y += fs/
-- 
2.13.0