[PATCH v2 1/2] usb/core: Added devspec sysfs entry for devices behind the usb hub

[PATCH v2 1/2] usb/core: Added devspec sysfs entry for devices behind the usb hub

[Vijay Kumar]

Grub finds incorrect of_node path for devices behind usb hub.
Added devspec sysfs entry for devices behind usb hub so that
right of_node path is returned during grub sysfs walk for these
devices.

Signed-off-by: Vijay Kumar <vijay.ac.kumar-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
---
 drivers/usb/core/sysfs.c |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index c953a0f..84d66d5 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -14,6 +14,7 @@
 #include <linux/string.h>
 #include <linux/usb.h>
 #include <linux/usb/quirks.h>
+#include <linux/of.h>
 #include "usb.h"
 
 /* Active configuration fields */
@@ -104,6 +105,17 @@ static ssize_t bConfigurationValue_store(struct device *dev,
 static DEVICE_ATTR_IGNORE_LOCKDEP(bConfigurationValue, S_IRUGO | S_IWUSR,
 		bConfigurationValue_show, bConfigurationValue_store);
 
+#ifdef CONFIG_OF
+static ssize_t devspec_show(struct device *dev, struct device_attribute *attr,
+			    char *buf)
+{
+	struct device_node *of_node = dev->of_node;
+
+	return sprintf(buf, "%s\n", of_node_full_name(of_node));
+}
+static DEVICE_ATTR_RO(devspec);
+#endif
+
 /* String fields */
 #define usb_string_attr(name)						\
 static ssize_t  name##_show(struct device *dev,				\
@@ -786,6 +798,9 @@ static struct attribute *dev_attrs[] = {
 	&dev_attr_remove.attr,
 	&dev_attr_removable.attr,
 	&dev_attr_ltm_capable.attr,
+#ifdef CONFIG_OF
+	&dev_attr_devspec.attr,
+#endif
 	NULL,
 };
 static struct attribute_group dev_attr_grp = {
-- 
1.7.1

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[PATCH v2 2/2] Documentation/ABI: Added ABI information for devspec and obppath.

[Vijay Kumar]

Updated Documentation/ABI for devspec and obppath sysfs entries.

Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
---
 Documentation/ABI/stable/sysfs-devices |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/Documentation/ABI/stable/sysfs-devices b/Documentation/ABI/stable/sysfs-devices
index df449d7..35c457f 100644
--- a/Documentation/ABI/stable/sysfs-devices
+++ b/Documentation/ABI/stable/sysfs-devices
@@ -8,3 +8,17 @@ Description:
 		Any device associated with a device-tree node will have
 		an of_path symlink pointing to the corresponding device
 		node in /sys/firmware/devicetree/
+
+What:		/sys/devices/*/devspec
+Date:		October 2016
+Contact:	Device Tree mailing list <devicetree@vger.kernel.org>
+Description:
+		If CONFIG_OF is enabled, then this file is present. When
+		read, it returns full name of the device node.
+
+What:		/sys/devices/*/obppath
+Date:		October 2016
+Contact:	Device Tree mailing list <devicetree@vger.kernel.org>
+Description:
+		If CONFIG_OF is enabled, then this file is present. When
+		read, it returns full name of the device node.
-- 
1.7.1