core/linux-raspberrypi to 4.14.56-2 (#1605)

- The serial device bus was compiled as a module, but this disabled
  use of the serial device TTY port controller that actually
  interfaces with the serdev drivers[1], rendering them unusable.
  Examples include the serdev driver for broadcom bluetooth HCI.

- Once built in to the kernel, enabling SERIAL_DEV_CTRL_TTYPORT to
  be built in, the userspace dependency on btattach is removed
  and the presence of the bluetooth controller can be indicated
  in the device tree, instead. This doesn't simply get rid of
  the dependency on btattach, but improves functionality,
  as the kernel does not restore the UART link to a higher baud
  rate after uploading the firmware to the bluetooth controller
  when notified of the controller over btattach but does so
  when notified through the device tree. hciattach does
  restore a higher set baud rate, but that is deprecated.

- According to [2], the configuration settings USB_CONFIGFS_F_*
  are meant for the user to indicate what sort of gadget
  functionality is to be enabled, while settings USB_F_* are
  meant to be used in the makefile for compilation.

- Enabled USB_CONFIGFS_F_UAC2 at the same time, since UAC1
  does not play well when used with a high-speed composite
  device (UAC1 is not compatible with high-speed, while
  UAC2 is)

- Kernel image size increased by 4008 bytes after these changes

1 - http://events17.linuxfoundation.org/sites/events/files/slides/serdev-elce-2017-2.pdf
2 - https://www.spinics.net/lists/linux-usb/msg142134.html

core/linux-raspberrypi/PKGBUILD

@@ -10,7 +10,7 @@ _srcname=linux-${_commit}
 _kernelname=${pkgbase#linux}
 _desc="Raspberry Pi"
 pkgver=4.14.56
-pkgrel=1
+pkgrel=2
 arch=('armv6h' 'armv7h')
 url="http://www.kernel.org/"
 license=('GPL2')
@@ -25,7 +25,7 @@ source=("https://github.com/raspberrypi/linux/archive/${_commit}.tar.gz"
 md5sums=('e5676b8bc923e1e54cd29a5c3b8021a5'
          '7c6b37a1353caccf6d3786bb4161c218'
          '60bc3624123c183305677097bcd56212'
-         'd7b181ee07de039bc245252c12128cb5'
+         'f2474f1f0bfe23560d21b3e8655fbadd'
          '552c43bf6c0225bc213b31ee942b7000'
          '982f9184dfcfbe52110795cf73674334')
 

core/linux-raspberrypi/config

@@ -1,6 +1,6 @@
 #
 # Automatically generated file; DO NOT EDIT.
-# Linux/arm 4.14.54-1 Kernel Configuration
+# Linux/arm 4.14.56-1 Kernel Configuration
 #
 CONFIG_ARM=y
 CONFIG_ARM_HAS_SG_CHAIN=y
@@ -2688,7 +2688,8 @@ CONFIG_SERIAL_SC16IS7XX_SPI=y
 # CONFIG_SERIAL_FSL_LPUART is not set
 # CONFIG_SERIAL_CONEXANT_DIGICOLOR is not set
 # CONFIG_SERIAL_ST_ASC is not set
-CONFIG_SERIAL_DEV_BUS=m
+CONFIG_SERIAL_DEV_BUS=y
+CONFIG_SERIAL_DEV_CTRL_TTYPORT=y
 CONFIG_TTY_PRINTK=y
 # CONFIG_HVC_DCC is not set
 # CONFIG_IPMI_HANDLER is not set
@@ -4622,12 +4623,32 @@ CONFIG_USB_F_RNDIS=m
 CONFIG_USB_F_MASS_STORAGE=m
 CONFIG_USB_F_FS=m
 CONFIG_USB_F_UAC1=m
+CONFIG_USB_F_UAC2=m
 CONFIG_USB_F_UVC=m
 CONFIG_USB_F_MIDI=m
 CONFIG_USB_F_HID=m
 CONFIG_USB_F_PRINTER=m
 CONFIG_USB_F_TCM=m
-# CONFIG_USB_CONFIGFS is not set
+CONFIG_USB_CONFIGFS=m
+CONFIG_USB_CONFIGFS_SERIAL=y
+CONFIG_USB_CONFIGFS_ACM=y
+CONFIG_USB_CONFIGFS_OBEX=y
+CONFIG_USB_CONFIGFS_NCM=y
+CONFIG_USB_CONFIGFS_ECM=y
+CONFIG_USB_CONFIGFS_ECM_SUBSET=y
+CONFIG_USB_CONFIGFS_RNDIS=y
+CONFIG_USB_CONFIGFS_EEM=y
+CONFIG_USB_CONFIGFS_MASS_STORAGE=y
+CONFIG_USB_CONFIGFS_F_LB_SS=y
+CONFIG_USB_CONFIGFS_F_FS=y
+CONFIG_USB_CONFIGFS_F_UAC1=y
+# CONFIG_USB_CONFIGFS_F_UAC1_LEGACY is not set
+CONFIG_USB_CONFIGFS_F_UAC2=y
+CONFIG_USB_CONFIGFS_F_MIDI=y
+CONFIG_USB_CONFIGFS_F_HID=y
+CONFIG_USB_CONFIGFS_F_UVC=y
+CONFIG_USB_CONFIGFS_F_PRINTER=y
+CONFIG_USB_CONFIGFS_F_TCM=y
 CONFIG_USB_ZERO=m
 # CONFIG_USB_ZERO_HNPTEST is not set
 CONFIG_USB_AUDIO=m