[LEDE-DEV] [PATCH] linux-4.9: Fix building of DWC3 module

[Alexey Brodkin]

DWC3 driver uses of_usb_get_phy_mode() which is
implemented in drivers/usb/phy/of.c and in bare minimal
configuration it might not be pulled in kernel binary.

In case of ARC or ARM this could be easily reproduced with
"allnodefconfig" +CONFIG_USB=m +CONFIG_USB_DWC3=m.

On building all ends-up with:
---------------------->8------------------
  Kernel: arch/arm/boot/Image is ready
  Kernel: arch/arm/boot/zImage is ready
  Building modules, stage 2.
  MODPOST 5 modules
ERROR: "of_usb_get_phy_mode" [drivers/usb/dwc3/dwc3.ko] undefined!
make[1]: *** [__modpost] Error 1
make: *** [modules] Error 2
---------------------->8------------------

This was affecting Lede in case of CONFIG_ALL_KMODS=y.

The patch is already scheduled for v4.12 and once it is backported to
4.9.y it must be removed from here.

Note this patch makes sense not only for ARC instead it fixes
a generic issue which may affect more arches and platforms thus
putting it in "generic/" folder.

Signed-off-by: Alexey Brodkin <Alexey.Brodkin at synopsys.com>
---
 ...90-usb-Make-sure-usb-phy-of-gets-built-in.patch | 54 ++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 target/linux/generic/patches-4.9/090-usb-Make-sure-usb-phy-of-gets-built-in.patch

diff --git a/target/linux/generic/patches-4.9/090-usb-Make-sure-usb-phy-of-gets-built-in.patch b/target/linux/generic/patches-4.9/090-usb-Make-sure-usb-phy-of-gets-built-in.patch
new file mode 100644
index 0000000000..1bc498be7c
--- /dev/null
+++ b/target/linux/generic/patches-4.9/090-usb-Make-sure-usb-phy-of-gets-built-in.patch
@@ -0,0 +1,54 @@
+From 3d6159640da9c9175d1ca42f151fc1a14caded59 Mon Sep 17 00:00:00 2001
+From: Alexey Brodkin <Alexey.Brodkin at synopsys.com>
+Date: Thu, 13 Apr 2017 15:33:34 +0300
+Subject: [PATCH] usb: Make sure usb/phy/of gets built-in
+
+DWC3 driver uses of_usb_get_phy_mode() which is
+implemented in drivers/usb/phy/of.c and in bare minimal
+configuration it might not be pulled in kernel binary.
+
+In case of ARC or ARM this could be easily reproduced with
+"allnodefconfig" +CONFIG_USB=m +CONFIG_USB_DWC3=m.
+
+On building all ends-up with:
+---------------------->8------------------
+  Kernel: arch/arm/boot/Image is ready
+  Kernel: arch/arm/boot/zImage is ready
+  Building modules, stage 2.
+  MODPOST 5 modules
+ERROR: "of_usb_get_phy_mode" [drivers/usb/dwc3/dwc3.ko] undefined!
+make[1]: *** [__modpost] Error 1
+make: *** [modules] Error 2
+---------------------->8------------------
+
+Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com>
+Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
+Cc: Masahiro Yamada <yamada.masahiro at socionext.com>
+Cc: Geert Uytterhoeven <geert+renesas at glider.be>
+Cc: Nicolas Pitre <nicolas.pitre at linaro.org>
+Cc: Thomas Gleixner <tglx at linutronix.de>
+Cc: Felipe Balbi <balbi at kernel.org>
+Cc: Felix Fietkau <nbd at nbd.name>
+Cc: Jeremy Kerr <jk at ozlabs.org>
+Cc: linux-snps-arc at lists.infradead.org
+Cc: stable at vger.kernel.org
+Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
+---
+ drivers/Makefile | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/drivers/Makefile b/drivers/Makefile
+index 2eced9afba53..8f8bdc9e3d29 100644
+--- a/drivers/Makefile
++++ b/drivers/Makefile
+@@ -104,6 +104,7 @@ obj-$(CONFIG_USB_PHY)		+= usb/
+ obj-$(CONFIG_USB)		+= usb/
+ obj-$(CONFIG_PCI)		+= usb/
+ obj-$(CONFIG_USB_GADGET)	+= usb/
++obj-$(CONFIG_OF)		+= usb/
+ obj-$(CONFIG_SERIO)		+= input/serio/
+ obj-$(CONFIG_GAMEPORT)		+= input/gameport/
+ obj-$(CONFIG_INPUT)		+= input/
+-- 
+2.11.0
+
-- 
2.11.0