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Commit cd6484e1 authored Feb 02, 2017 by Rob Herring Committed by Greg Kroah-Hartman Feb 03, 2017

serdev: Introduce new bus for serial attached devices



The serdev bus is designed for devices such as Bluetooth, WiFi, GPS
and NFC connected to UARTs on host processors. Tradionally these have
been handled with tty line disciplines, rfkill, and userspace glue such
as hciattach. This approach has many drawbacks since it doesn't fit
into the Linux driver model. Handling of sideband signals, power control
and firmware loading are the main issues.

This creates a serdev bus with controllers (i.e. host serial ports) and
attached devices. Typically, these are point to point connections, but
some devices have muxing protocols or a h/w mux is conceivable. Any
muxing is not yet supported with the serdev bus.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-By: Sebastian Reichel <sre@kernel.org>
Tested-By: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent c1c98dad

MAINTAINERS

+8 −0

Original line number	Diff line number	Diff line
		@@ -10831,6 +10831,14 @@ S: Maintained
		F: Documentation/devicetree/bindings/serial/
		F: drivers/tty/serial/

		SERIAL DEVICE BUS
		M: Rob Herring <robh@kernel.org>
		L: linux-serial@vger.kernel.org
		S: Maintained
		F: Documentation/devicetree/bindings/serial/slave-device.txt
		F: drivers/tty/serdev/
		F: include/linux/serdev.h

		SERIAL IR RECEIVER
		M: Sean Young <sean@mess.org>
		L: linux-media@vger.kernel.org

drivers/char/Kconfig

+1 −0

Original line number	Diff line number	Diff line
		@@ -46,6 +46,7 @@ config SGI_MBCS
		say Y or M here, otherwise say N.

		source "drivers/tty/serial/Kconfig"
		source "drivers/tty/serdev/Kconfig"

		config TTY_PRINTK
		tristate "TTY driver to output user messages via printk"

drivers/tty/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -13,6 +13,7 @@ obj-$(CONFIG_R3964) += n_r3964.o
		obj-y += vt/
		obj-$(CONFIG_HVC_DRIVER) += hvc/
		obj-y += serial/
		obj-$(CONFIG_SERIAL_DEV_BUS) += serdev/

		# tty drivers
		obj-$(CONFIG_AMIGA_BUILTIN_SERIAL) += amiserial.o

drivers/tty/serdev/Kconfig

0 → 100644

+8 −0

Original line number	Diff line number	Diff line
		#
		# Serial bus device driver configuration
		#
		menuconfig SERIAL_DEV_BUS
		tristate "Serial device bus"
		help
		Core support for devices connected via a serial port.

drivers/tty/serdev/Makefile

0 → 100644

+3 −0

Original line number	Diff line number	Diff line
		serdev-objs := core.o

		obj-$(CONFIG_SERIAL_DEV_BUS) += serdev.o